JP2000293676A - Image display device and image display method - Google Patents

Abstract

(57) [Summary] In an image display device that displays an image while changing the display position and / or display size of the image, an image with improved resolution is displayed at high speed without using expensive dedicated hardware or the like. To provide an image display device that can perform the operation. SOLUTION: In an image display apparatus for displaying while changing a display position and / or a display size of an image in response to an instruction given from a remote controller or the like, whether the instructed speed is higher than a predetermined speed or not. Is determined (S
142) If the size is larger, the display image is resized by a method that prioritizes the processing speed over the image quality (S143).
If the speed is equal to or lower than the predetermined speed, size change processing is performed with priority given to image quality (S144).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an image display apparatus and an image display method, and more particularly to an image display apparatus and an image display method for displaying an image while changing the size of the image according to conditions.

[0002]

2. Description of the Related Art In recent years, devices for processing digital images have been used in various forms. Processing on personal computer, workstation, MPEG1, DVD
And the like.

In addition, digital still cameras, digital video cameras, and the like have been generally handled, and digital images can be easily created. Until now, work such as organizing photographs taken on film by an optical camera into an album has been realized by storing a large amount of digitized data in a storage device such as a hard disk. In this case, work such as searching and classifying data can be performed only by data processing, and work efficiency is remarkably improved.

[0004] From the viewpoints of cost and location, the use value of digitized image data for storing image data is increasing, and workers can easily organize, search, and retrieve the image data.
The development of categorizable tools is active.

[0005] Japanese Patent Application No. 8-245098 discloses an information processing apparatus for managing a plurality of data in a file management system or a database system of a computer according to associated dates and times, and displaying the data. In addition, the application discloses a method of displaying images related to date and time, for example, face photographs arranged in order of date of birth in a search for personnel management data associated with date of birth.
At this time, instead of being arranged at regular intervals in the order of the date of birth, a display method is used in which the time difference of the date of birth can be recognized.

FIG. 12 shows an example of a time axis expression using a perspective method, assuming a time axis in the depth direction of the display (a direction perpendicular to the paper surface).

In FIG. 12, reference numeral 101 denotes a display window, and square data icons representing image data, such as 103 and 104, are displayed in the display window 101. Reference numerals 102 and 105 are links corresponding to the date and time at which the image data is associated. The smaller the ring, that is, the closer to the center of the screen, the more past or future in days, the smaller the diameter of the ring, the smaller the data icon on the ring around the screen (larger ring). The larger the data, the larger the image data is displayed. Such a display expresses the depth that the periphery is near and the center is far. Further, the ring (referred to as 105) corresponding to the date currently focused on is displayed thicker than the other rings, and the date indicated by the ring 105 is displayed at the upper left of the display window 101 (FIG. 12).
1996/7/1).

The number of days corresponding to each ring may be one day, two days, or one week. If there are many data icons corresponding to one ring, the number of days corresponding to the ring is changed to keep the number of data icons on the ring within a predetermined number.

In the above-mentioned display mode, when the user wants to display the back image data larger, a zoom-in operation is performed. Thereby, the data icon and the ring corresponding to the data icon are displayed larger. For example, when the zoom-in operation is performed in FIG. 12, each data icon and the corresponding ring are gradually enlarged, and the outermost ring 102 and the corresponding data icon 103 protrude from the display window 101 by continuing the zoom operation. It disappears while a new ring and corresponding data icon are displayed from the center of the screen.

Conversely, when it is desired to display a data icon that has protruded from the screen, a zoom-out operation is performed. When zooming out, the displayed ring and data icon are small and gather at the center of the screen,
A past or future data icon and a ring appear from the outside of the screen, and when the display is smaller than a predetermined size, the ring and the corresponding data icon are not displayed.

When a user searches for an image in an image database for such display, the date displayed at the upper left of the display window 101 is changed,
Perform zoom-in and zoom-out operations by retrieving the data icon image. When the user finds a desired image, the original data file and a large image are opened by double-clicking the data icon. As described above, by setting the date and time in the front and depth directions, and by continuously zooming in and out, the data can be enlarged or reduced to provide a sense of time.

FIG. 13 is a diagram for explaining a change in display due to zoom-in and zoom-out operations, focusing on a certain ring and one data icon belonging to the ring. Here, it is assumed that the display is such that the time is further in the back (the smaller the display) is in the past, and the time is more advanced in the front (the larger the display). 140a to 140d are display windows. 142a to 142d indicate rings indicating a certain date and time, and 141a to 141d indicate data icons (thumbnail images) on the rings. As shown in FIG. 13, in the case of a zoom-in operation (returning to the past and continuously viewing image data), 141a and 142 are initially set.
As shown in FIG. 7A, the image appears small in the center of the screen, and as the zoom-in operation is continued, the images are displayed in large scale as 141b, 142b, 141c, 142c, and 141d, 142d. In 141d, the data icon is displayed large and only a part is displayed. Thereafter, the image data disappears from the screen. When zooming out, the display is reversed.

[0013] In this manner, the data icons are arranged in a time series and displayed in a size reflecting a relative time difference.
By continuously changing the display with zoom-in and zoom-out operations, it is possible to realize image data expression that is close to the user's memory sensation, and it is possible to intuitively grasp the tendency of data aggregation from the time axis. .

[0014]

In order to realize the above-described display method, first, a thumbnail image as a data icon is prepared, and the display position and size of this image are changed and displayed.

Further, during zoom-in and zoom-out operations, it is necessary to update these images quickly so that they can be seen by human eyes. For example, 30 per second
It needs to be updated so that the top image can be displayed.

For this reason, conventionally, a resizing process for changing the size of a display image by a simple pixel thinning and pixel inflating method has been performed to draw a thumbnail image.

For example, in order to reduce the display size of an 80 * 60 pixel image to, for example, 72 * 54 pixels, it is realized by thinning out one out of 10 pixels out of the horizontal 80 pixel data. 1 to 8 for horizontal pixels
When numbers are assigned to 0, 1 to 9, 11 to 19,
21 to 29, 31 to 39, 41 to 49, 51 to 59, 61 to 69, 71 to 79, and these data are drawn in the VRAM. The same applies to changing the vertical 60 pixels to 54 pixels.

In order to increase the display size, for example, to 88 * 66 pixels, one of 10 pixels out of 80 pixels in the horizontal direction is padded. When the horizontal pixels are numbered from 1 to 80, 1 to 10, 10 are drawn again, 11 to 20, 20 are drawn again, 21 to 30, 30 are drawn again, and 31 to 40, 40 are drawn again. Drawing, 71 to 80,
80 is drawn in the VRAM such as drawing again. The same applies to the case where 60 pixels in the vertical direction are changed to 66 pixels.
In this way, display image data having different sizes is created, and drawn on the VRAM so as to be arranged as described above, viewed in the depth direction on the time axis.

Such a resizing process is performed on each data icon, and one frame is replaced within 1/30 second and displayed on the display. In the case of the zoom-in operation, in the next frame after the display of 72 * 54 pixels, the thumbnail image itself of 80 * 60 pixels is drawn in the VRAM.

In this way, the depth is regarded as the time axis, the depth is given by perspective,
At the time of zooming out, it is possible to smoothly display along the time axis as if approaching or moving away.

However, in the conventional method, since the thumbnail images to be displayed are simply thinned out or inflated, the image distortion is conspicuous and the image quality is considerably low.

If a resizing process is performed on an image by applying a filter corresponding to the display size and re-sampling the image, using an error diffusion method or the like, the image quality is good, but the resizing process takes time. Therefore, in order to resize all images at 30 frames / second as in the above-described display method, expensive dedicated hardware or the like is required.

Accordingly, an object of the present invention is to provide an image display apparatus for displaying an image while changing the display position and / or the display size of the image, without having to use expensive dedicated hardware or the like, to quickly output an image with improved resolution. It is an object of the present invention to provide an image display device and an image display method capable of displaying.

[0024]

That is, the gist of the present invention is to provide an image display apparatus for displaying a plurality of images while changing a display position and / or a display size of each of the plurality of images according to given conditions. A first resizing means for generating image data of an arbitrary size from the original image data of the image by the first processing method, and a second processing method having less deterioration of the image quality than the result of the first method A second resizing means for generating image data of an arbitrary size from the original image data of the image, and a first resizing means according to a predetermined condition.
Alternatively, there is provided an image display device comprising: a selection unit that selects one of the second resizing units and supplies the original image data.

Another aspect of the present invention is an image display apparatus which displays a plurality of images while changing a display position and / or a display size of each of the plurality of images according to given conditions, A display size change amount determining unit that determines a change ratio of the display size according to a given condition; a size change detecting unit that detects whether the display size after the change is different from the display size before the change; Only the image for which the size change has been detected by the detecting means is output by enlarging or reducing the original image data of the image according to the display size change amount determined by the display size change amount determining means, and the size change detecting means detects the size change. An image display device characterized by having resizing means for outputting image data before change for an image not to be changed.

Another aspect of the present invention is an image display apparatus which displays a plurality of images while changing a display position and / or a display size of each of the plurality of images according to given conditions, First resizing means for generating image data of an arbitrary size from original image data of an image by a first processing method, and an original image of an image by a second processing method having a larger processing amount than the result of the first method A second resizing means for generating image data of an arbitrary size from the data; and a selecting means for selecting one of the first and second resizing means in accordance with a predetermined condition and supplying the original image data. An image display device characterized by the following.

According to another aspect of the present invention, there is provided an image display method for displaying a plurality of images while changing a display position and / or a display size of each of the plurality of images according to given conditions. A first resizing step of generating image data of an arbitrary size from the original image data of the image by the first processing method, and a second processing method in which the image quality is less deteriorated than the result of the first method. A second resizing step of generating image data of an arbitrary size from the image data; and a first or second resizing step according to a predetermined condition.
A selecting step of selecting one of the resizing steps and supplying the original image data.

Another aspect of the present invention is an image display method for displaying a plurality of images while changing a display position and / or a display size of each of the plurality of images according to given conditions. A display size change amount determining step of determining a change ratio of the display size according to a given condition; a size change detecting step of detecting whether the display size after the change is different from the display size before the change; For the image whose size change is detected by the detection step, the original image data of the image is enlarged or reduced according to the display size change amount determined by the display size change amount determination step and output, and the size change detection step detects the size change A resizing step of outputting image data before change for an image not to be changed.

Another aspect of the present invention is an image display method for displaying a plurality of images while changing a display position and / or a display size of each of the plurality of images according to given conditions. A first resizing step of generating image data of an arbitrary size from original image data of an image by a first processing method, and an original image of an image by a second processing method having a larger processing amount than the result of the first method A second resizing step of generating image data of an arbitrary size from the data, and a selecting step of selecting one of the first and second resizing steps according to a predetermined condition and supplying the original image data Image display method characterized by the following.

Another aspect of the present invention resides in a storage medium that stores a program executable by an apparatus and that realizes any of the aspects described above.

[0031]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. (Hardware Configuration) FIG. 1 is a block diagram showing the configuration of the image display device according to the first embodiment of the present invention. A CPU 1 controls a sequence and data of the entire apparatus, and executes a program on a program memory (not shown). The program memory may be built in the CPU, may be an external ROM connected to the bus 9, may be the DRAM 2, or the like. In the case of the DRAM 2, the program stored in the external storage device 4 such as an HDD or a CD-ROM may be stored. The program is loaded on the DRAM 2 and executed.

Numeral 2 denotes a DRAM which is a main memory of the CPU and other data memories. In order to improve the transfer speed of the bus 9, a synchronous synchronous DRAM or the like may be used.

Reference numeral 3 denotes a DMA controller which receives instructions from the CPU 1 and exchanges data between blocks at high speed by using the bus 9; and 4, an external storage device for storing image database data. CD-R (RW), DVD-R
AM, HDD, magneto-optical disk, memory card and the like can be used instead.

Reference numeral 5 denotes a compression / decompression processing unit for compressing and decompressing image data. The data compression / decompression method is J
Any method such as PEG can be used. Reference numeral 6 denotes a resize processing unit that changes the display size of image data, that is, the number of pixels, and can enlarge or reduce the image data.

Reference numeral 7 denotes a video encoder for converting image data into a video signal so that the image data can be displayed on the display unit 8.
Reference numeral 8 denotes a display unit for displaying a video signal output from the video encoder 7 as an image, and an arbitrary display element such as a CRT, a liquid crystal panel, and a plasma display panel can be used.

Reference numeral 9 denotes a data bus for connecting the blocks. Data transfer between the blocks connected to the bus 9 is performed via the bus 9. Reference numeral 10 denotes a remote controller, which is operated by a user to give a command to the CPU 1.

(Display Operation) Next, the display operation in this embodiment will be described. In FIG. 12, 103, 1
Consider a state where 20 data icons, that is, 20 thumbnail images are displayed in the display window 101. For example, there are five rings, such as the ring 105, and four thumbnail images are displayed on one of these rings. This state is shown in FIG.

A case in which 20 thumbnails have been moved along a time axis direction imaginary perpendicular to the display window 101 of the display unit 8 by the operation of the remote controller 10 by the user will be described. The external storage device 4 has about 10,000
Approximately 10,000 image data are stored, and about 10,000 such thumbnail image data are also stored.
These thumbnail image data have an image size of 80 * 6
It is assumed that 24-bit color data of 0 pixel is stored as compressed data in the JPEG format. At this time, assuming that the data capacity at the time of decompression is 14.4 KB and is compressed to about 1/10 by JPEG, the data capacity of the compressed thumbnail image is 1.44 KB.

FIG. 3 is a diagram schematically showing the data size of a thumbnail image. 1.44KB thumbnail JPG
The compressed data 21 is decompressed (expanded) to 1
It becomes the decompressed data 22 of 4.4 KB, and the resize processing unit 6
To become display data 23 (data size 1 to 50 KB) having different display sizes.

Next, the initial display operation will be described with reference to FIG. The CPU 1 reads the compressed thumbnail data from the external storage device 4 and writes it into the DRAM 2 (step S171). At this time, the amount of thumbnail compressed data read at once from the external storage device 4 (the number of thumbnails)
Can freely set an amount with good transfer efficiency. For example, one thumbnail or ten thumbnails of compressed data are read from the external storage device 4.

Thereafter, the thumbnail compressed data is immediately transferred to the compression / decompression processing unit 5 to perform JPEG decompression processing.
The result is expanded on the DRAM 2 as decompressed data (step S172). Since the original compressed thumbnail data that has been decompressed becomes unnecessary, it is deleted or overwritten with other data.

If the thumbnail images displayed in the display window are from the 1001th to the 1020th,
In step S171, the 981th to 1040th thumbnail data are developed on the DRAM2. Having as many as 10,000 sheets of data as decompressed data is inefficient from the standpoint of DRAM capacity. This is because the decompressed data capacity of 10,000 sheets is as large as 144 MB.

That is, when displaying the 1001th to 1020th thumbnail images on the display window,
J1 from 981 to 1040 on DRAM2
The PEG-compressed thumbnail image is read from the external storage device 4, and the 1001st to 1020th are JPE
After G is decompressed and expanded on the DRAM 2, the remaining thumbnail images are expanded. With a total of 60 cards, the usage of the DRAM 2 is about 864 KB.

The 1001th to 1020th thumbnail images displayed on the display window are 1001th thumbnail images.
The data is transferred from the DRAM 2 to the resize processing unit 6 by the DMAC 3 in order from the
It is arranged in a display window display memory area on M2.

The display window display memory area on the DRAM 2 is composed of, for example, 640 * 480 pixels of 8 bits for each of RGB (24 bits in total). DRA
The data in the display window display memory area on M2 is D
The video data is transferred to the video encoder 7 by the MAC 3, and the video encoder 7 converts the 8-bit data of each of RGB into a luminance / color difference signal for video output, generates a video signal, and outputs the video signal to the display unit 8.

Of the 981 th to 1040 th thumbnail compressed data arranged on the DRAM 2, 10
The 01th decompressed thumbnail data is transferred to the resize processing unit 6 by the DMAC 3. Resize processing unit 6
Then, based on the command of the CPU 1, the display size is changed. For example, the size is changed to 16 * 12 pixels.

The resized data is arranged by the DMAC 3 in the display window display memory area on the DRAM 2. At this time, it is arranged in an area corresponding to the display location based on a command of the CPU 1. One of the four smallest thumbnail images solidified in the center in FIG.
Assume that it corresponds to the th thumbnail image.

Next, like the 1001st image, 10
The 02th decompressed thumbnail image is transferred to the resize processing unit, and the data resized to 16 * 12 pixels is arranged in the display window display area of the DRAM 2. The 1002th thumbnail image is also displayed near the center. The 1001th to 1004th thumbnail images are arranged in the display window display memory area on the DRAM 2 as the smallest thumbnail image at the center.

Next, similarly to the 1004th, 100
The fifth decompressed thumbnail image is transferred from the DRAM 2 to the resize processing unit 6 by the DMAC 3. At this time, the 1005th thumbnail image is resized to 48 * 36 pixels. This command is executed by the CPU 1. The resized data is arranged in the display window display area of the DRAM 2. The 1005th thumbnail image is the second ring from the inside, for example, 1 in FIG.
06 are arranged as thumbnail images. Similarly 100
The 6th to 1008th thumbnail images are resized one by one and placed on the second ring from the inside.

In the third ring from the inside, 1009
The 10th to 1012th thumbnail images are arranged in the fourth ring, the 1013th to 1018th thumbnail images are arranged in the fourth ring, and the 1017th to 1020th thumbnail images are arranged in the outermost ring. Similarly, the image arranged in the third ring from the inside is 80 * 60 pixels, the image arranged in the fourth ring is 112 * 84 pixels, and the image arranged in the outermost ring is 144 * 96 pixels. Is the size of

The thumbnail image data arranged in the display window display area of the DRAM 2 is output to the display window as a video signal by the video encoder, and is displayed as shown in FIG. The resizing of the twenty thumbnail compressed images and the arrangement in the display window display area are performed within one frame display time of the display window, for example, 10 ms.

(Zoom Operation) Here, it is assumed that an instruction to move the display from the past to the present is given by a user's remote control operation. In the screen display shown in FIG. 2, a large image near the outer periphery of the display window is new, and a small image near the center is an old image. In order to zoom the display from the past to the present, that is, to zoom out, the thumbnail image is displayed as if it was moved away from the past on the time axis, that is, to the back, so the data displayed in the next display window frame is The display size is slightly smaller than the thumbnail image arranged in the display window display memory area, and the display position is slightly closer to the center.

In this display frame, as in the previous frame, 20 thumbnail images are arranged in the display window display memory area. First, the 1001th thumbnail image drawn in the previous frame is deleted. For example, if the background is black, the area is filled with black data.

Next, similarly to the previous frame, the 1001th decompressed thumbnail data is transferred to the resize processing unit 6 by the DMAC 3. In the resize processing unit 6, the CP
The display size is changed based on the command of U1. Unlike the previous frame (16 * 12 pixels), this time 14 *
The size is changed to 11 pixels.

The resized data is arranged by the DMAC 3 in the display window display memory area on the DRAM 2. At this time, it is arranged in an area corresponding to the display location based on a command of the CPU 1. Externally, it is arranged slightly from the center of the display position in the previous frame. Further, the 1002th to 1004th thumbnail images corresponding to the same time as the 1001th thumbnail image are similarly reduced to 14 * 11 pixels, and are arranged so as to be slightly centered from the previous frame.

Similarly, the 1005th to 1008th images have a size of 38 * 29 pixels which is smaller than that of the previous frame (48 * 36 pixels), and are also arranged slightly from the center of the previous frame. 1009 to 1
Similarly, the 020th thumbnail image is arranged smaller than the previous frame and closer to the center. This operation is repeated, and for each display window frame, the 20 decompressed thumbnail data are resized and arranged at the position where the display window display memory area is to be drawn.

When the zoom-out instruction is continued and the above-described display operation is repeated, the 1001th to 1004th thumbnail images become smaller. When the thumbnail image falls below a predetermined range, these 1001th to 1004th thumbnail compressed images are displayed. It is excluded from the target, and instead, a new ring and a thumbnail image corresponding to the date of the ring (1021 to 1024th) are displayed on the outermost periphery of the display window. At this time, the entire thumbnail image is not displayed yet, and the portion that protrudes from the frame of the display window is not displayed.

Thereafter, the same processing as that performed for the 1001 to 1020th thumbnail images is performed.
This is performed for the 1024th to 1024th thumbnail images. Also at this time, for each frame of the display window, the decompressed thumbnail data from the 1005th to the 1024th is sent from the DRAM 2 to the resize processing unit 6, and the resize processing unit 6 resizes the thumbnail data and places it in the display window display area of the DRAM2. .

In this way, the thumbnail images arranged in the display window are displayed in the display window in the expression with the depth of the time axis from the past to the present, and the user moves the time axis in accordance with the scanning by the user. Display method becomes possible.

When the user instructs the remote controller to zoom in so that the display thumbnail goes back to the past, the display size becomes larger than the previous frame and the display position is slightly shifted to the outer side, contrary to the zoom-out operation. Become. In this way, it is possible to display a thumbnail moving in the past direction on the time axis.

(Resizing Process) Next, a method of resizing a thumbnail image will be described. In the present embodiment, the resize processing section 6 is formed so that two resizing methods can be performed. That is, one is image quality priority resizing, and the other is speed priority resizing.

First, the image quality priority resizing process will be described.
In image quality priority resizing, at the time of reduction, a filter suitable for the display size is applied, and resampling is performed to the display size.
At the time of enlargement, resampling is performed while interpolating. For example, a case where the display size of the original image of 80 * 60 pixels is changed to 64 or 48 pixels by the image quality priority resizing process will be described.

FIG. 4 is a schematic view of a horizontally long thumbnail image composed of 80 pixels horizontally and 60 pixels vertically of the original image. One of the square frames represents one pixel. The horizontal direction is x and the vertical direction is y. Actually x has 80 pixels,
In the figure, only the first five pixels are shown for explanation. Similarly, there are 60 pixels in the y direction, but only the first four pixels are shown.

In the following description, each pixel (position or its value) is represented as (y, x) by putting numbers in y and x. For example, the upper left pixel (or its value) is (1, 1), and the right pixel (or its value) is (1, 1).
2).

FIG. 5 shows the coefficients and positions of the filters applied to the image data in the image quality priority resizing process. In the figure, the coefficient at the center is 4; Since these coefficients add up to 10, the value obtained by multiplying these coefficients and dividing the total by 10 is used as the filter result in the actual calculation, with the pixel to be filtered as the central pixel.

For example, a filtered pixel (2,2) f (hereinafter, (y, x) f represents a pixel (or its value) after filtering of (y, x)).
Is (2,2) f = ((1,1) * 0.5 + (1,2) + (1,3) * 0.5 + (2,1) + (2,2) * 4 +
(2,3) + (3,1) * 0.5 + (3,2) + (3,3)) / 10.

Similarly, a filter operation is performed on all pixels. Since there is no operation data at the end pixel,
The data at the end is extended and used. That is, the filtering calculation of pixel (1,2) is (1,2) f = ((1,1) * 0.5 + (1,1) + (1,2) * 0.5 + (2,1) + (2 , 1) * 4 +
(2,2) + (3,1) * 0.5 + (3,1) + (3,2)) / 10. By such a filtering process, 80 *
An image having lower spatial frequency characteristics than the 60-pixel original image is generated.

Next, the resizing process by the resampling process will be described. A case where a 64 * 48 pixel image is generated from the 80 * 60 pixel thumbnail image shown in FIG. 4 will be described also with reference to FIG.

First, resampling is performed in the x direction. FIG. 6 shows the pixel number in the x direction on the horizontal axis and the numerical value of the pixel on the vertical axis. The manner of resampling the top row where y is 1 will be described. The pixel after x re-sampling is (y,
x) x, (1,1) x = (1,1) f (1,2) x = (1,2) * (48/64) + (1,3) * (16/64) (1,3) x = (1,3) * (32/64) + (1,4) * (32/64) (1,4) x = (1,4) * (16/64) + ( 1,5) * (32/64). As shown in FIG. 6, a value obtained by linearly interpolating the numerical value of x is sampled at a sample point on the axis of x '. In this way, 80 pixels are resampled to 64 pixels. At this time, (y, x) x pixels are 64 * 60 pixels.

Next, resampling is performed in the y direction in the same manner as in the x direction. The pixel after y re-sampling is expressed as (y, x) y. (1,1) y = (1,1) x (2,1) y = (2,1) x * (38/48) + (3,1) x * (12/48) (3,1) y = (3,1) x * (24/48) + (4,1) x * (24/48) (4,1) y = (4,1) x * (12/48) + (5, 1) x * (36/48) Thus, the thumbnail image of 80 * 60 pixels is reduced to 64 * 48 pixels.

When the image is reduced to a small image of 40 * 30 pixels or less, the above method may be used directly. However, pixels which are not referred to appear and noise occurs. In order to prevent this, the above method is performed several times. For example, 80 * 60 pixels are converted to a 56 * 42 pixel image in the manner described above, and then reduced to 40 * 30 pixels again using the above method.

Next, enlargement of a thumbnail image will be described. A method of enlarging an 80 * 60 pixel image to a 96 * 72 pixel image by resampling will be described.
First, resampling is performed in the x direction. FIG. 7 shows the pixel number in the x direction on the horizontal axis and the numerical value of the pixel on the vertical axis.
The manner in which the top row where y is 1 is sampled will be described.

The pixel after x re-sampling is represented by (y, x) x
Is expressed as (1,1) x = (1,1) f (1,2) x = (1,1) * (16/96) + (1,2) * (80/96) (1,3) x = (1,2) * (32/96) + (1,3) * (64/96) (1,4) x = (1,3) * (48/96) + (1,4) * (48 / 96) (1,5) x = (1,4) * (64/96) + (1,5) * (32/96) (1,6) x = (1,5) * (80/96 ) + (1,6) * (16/96) As shown in FIG. 7, a value obtained by linearly interpolating the numerical value of x is sampled at a sample point on the x′-axis. In this way,
Resample 80 pixels to 96 pixels. At this time, (y, x) x is 96 * 60 pixels.

Next, resampling is performed in the y direction in the same manner as in the x direction. The pixel after y re-sampling is expressed as (y, x) y. (1,1) y = (1,1) f (2,1) y = (1,1) * (12/72) + (2,1) * (60/72) (3,1) y = (2,1) * (24/72) + (3,1) * (48/72) (4,1) y = (3,1) * (36/72) + (4,1) * (36 / 72) (5,1) y = (4,1) * (48/72) + (5,1) * (24/72) (6,1) y = (5,1) * (60/72) ) + (6,1) * (12/72) Thus, the thumbnail image of 80 * 60 pixels is enlarged to 96 * 72 pixels.

As described above, it is possible to perform the reduction and enlargement processing with less deterioration in image quality by the reduction and enlargement processing by the filtering and the interpolation operation. However, since the processing procedure is complicated, the time required for resizing is long. This resizing process is called image quality priority resizing.

On the other hand, in the speed-priority resizing process, a thumbnail image is drawn by a simple pixel thinning and pixel padding method. For example, in order to set the display size of an 80 * 60 pixel image to, for example, 72 * 54 pixels, it is realized by thinning out one out of 10 pixels in the horizontal 80 pixel data. 1 to 80 for horizontal pixels
When numbers are assigned from 1 to 9, 11 to 19, 2
1 to 29, 31 to 39, 41 to 49, 51 to 5
9, 61 to 69, 71 to 79
Draw on AM. The same applies to changing the vertical 60 pixels to 54 pixels.

In order to increase the display size, for example, to 88 * 66 pixels, one of 10 pixels out of 80 pixels in the horizontal direction is padded. When the horizontal pixels are numbered from 1 to 80, 1 to 10, 10 are drawn again, 11 to 20, 20 are drawn again, 21 to 30, 30 are drawn again, and 31 to 40, 40 are drawn again. Drawing, ..., 71 to 8
0 and 80 are drawn again in the VRAM. The same applies to the case where 60 pixels in the vertical direction are changed to 66 pixels.

As described above, simple thinning and reduction and enlargement processing by padding can reduce the processing amount, that is, perform high-speed reduction and enlargement processing. On the other hand, the image is distorted, a step is formed in an oblique straight line, and the image quality is inferior to the previous image quality priority resizing. The resizing process by this method is called speed-priority resizing.

(Selection of Resizing Process) When the user tries to search (zoom in) in the past direction of the thumbnail image by operating the remote controller, the thumbnail displayed on the display moves outward from the center and gradually. growing.

The remote control has a speed control lever, and the search direction and the search speed are determined by the position of the lever. That is, the moving speed and the changing speed of the size of the thumbnail displayed on the display change according to the position of the lever. The speed adjustment stage of the speed control lever may be two stages of a high speed and a low speed, or may be configured so as to be divided between a minimum speed and a maximum speed at a predetermined level or to change continuously.

For example, when the speed control lever has two positions, high speed and low speed, and when the speed control lever is low speed, the thumbnail image displayed on the display slowly moves from the center to the outer peripheral side. Further, the display size of the thumbnail image gradually increases. In the present embodiment, when moving at a low speed, the above-described image quality priority resizing is performed. For example, when a certain thumbnail image is moved or enlarged after being displayed on the display, and the time during which the thumbnail image is not displayed on the display is equal to or less than a speed corresponding to 3 seconds or more, resizing is performed by image quality priority resizing processing.

Conversely, when the moving and enlarging of the thumbnail image are fast, for example, when a certain thumbnail image is moved and enlarged after being displayed on the display and the time during which the thumbnail image is not displayed on the display is higher than the speed corresponding to less than 3 seconds, Resize is performed by speed priority resize processing. Similarly, when the user attempts to search (zoom out) for a thumbnail image in the future direction by operating the remote controller, the thumbnail displayed on the display moves from the outside toward the center and gradually becomes smaller.

Also in this case, for example, when a certain thumbnail image is moved or reduced after being displayed on the display and the time during which the image is not displayed on the display is at a speed equal to or longer than 3 seconds or less, resizing is performed by the image quality priority resizing process. Also, when the moving and reducing of the thumbnail images are fast, for example, when a certain thumbnail image is moved and reduced after being displayed on the display, and when the time during which the thumbnail image is not displayed on the display is higher than the speed corresponding to less than 3 seconds, the speed priority resizing is performed. Resize by processing.

The above selection process will be described with reference to FIG.
For example, when the CPU 1 determines a speed instruction value from the remote controller 10, the CPU 1 determines a thumbnail image to be displayed,
The display size and display position for each thumbnail image are determined (step S141). Next, it is determined whether or not the speed instruction value is equal to or higher than a predetermined speed (step S1).
42) If the speed is equal to or higher than the predetermined speed, a speed priority resizing process is performed (step S143). On the other hand, if the speed is lower than the predetermined speed, the image quality priority resizing process is performed (step S144). When the resizing process is completed, each thumbnail image is drawn (transferred) to an area of the DRAM 2 corresponding to a predetermined position (step S145). The processes of steps S141 to S145 are similarly repeated for the next frame and thereafter.

[Second Embodiment] In the above-described first embodiment, two resizing methods are switched according to the speed instruction value instructed by the remote controller 10. In the present embodiment, switching is performed according to the display size. It is characterized by the following. That is, the user operates the remote control to
When trying to search (zoom in) in the past direction of the thumbnail image, the thumbnail displayed on the display moves from the center toward the outer periphery and gradually increases.

That is, the thumbnail image near the center is small, and the thumbnail image displayed on the periphery of the display is large. The above-described image quality priority resizing process is performed on the thumbnail image displayed on the periphery of the display.

For example, when the thumbnail size is 96 * 72 pixels or more, the image quality priority resizing process described in the above embodiment is performed, and when the thumbnail size is less than 96 * 72 pixels, the speed priority resizing process is performed. By doing so, the amount of processing required for resizing is reduced as compared with the case where image quality priority resizing processing is performed on all thumbnail images, and there is no need to have a means for performing expensive, complicated and high-speed resizing processing. For example, C
Resizing by PU1 software processing becomes possible.

By performing reduction by simple thinning when the display size is small, it is not necessary to access all the pixels of the original thumbnail image data, and the usage rate of the bus 9 in FIG. 1 can be reduced. It is possible to increase the usage rate of the bus 9 in processing such as data transfer from the device 44 and JPEG decompression of the compression / decompression processing unit 5. That is,
The number of thumbnail images that can be searched in a unit time can be increased. In addition, high-quality resizing is performed on a large thumbnail image in which image quality is conspicuous, so that a high-quality image display device is obtained.

FIG. 10 is a flowchart for explaining the resizing process switching process according to the present embodiment. When the CPU 1 determines the speed instruction value from the remote controller 10, the CP
U1 determines the thumbnail images to be displayed, and determines the display size and display position for each thumbnail image (step S151).

Next, it is determined whether or not the display size of one of the thumbnails to be displayed exceeds a predetermined size (96 * 72 pixels) (step S1).
52) If it does not exceed the predetermined size, a speed priority resizing process is performed (step S154). On the other hand, if the size exceeds the predetermined size, image quality priority resizing processing is performed (step S153). When the resizing process is completed, the thumbnail image is drawn (transferred) to an area of the DRAM 2 corresponding to a predetermined position (step S155). Then, it is determined whether or not the rendering to the DRAM has been completed for all the thumbnails to be displayed (step S156).
Then, when the drawing processing of all the display target thumbnails is completed, the frame display processing is completed. The processes of steps S151 to S156 are similarly repeated for the subsequent frames.

[Third Embodiment] Next, a third embodiment of the present invention will be described. The present embodiment is characterized in that the amount of change in the display size is adjusted according to the moving speed, and the resizing process is omitted according to the size difference from the previous display.

When the user attempts to search (zoom in) in the past direction of the thumbnail image by operating the remote controller, the thumbnail displayed on the display moves outward from the center and gradually increases.

The remote control has a speed control lever, and the search direction and the search speed are determined by the position of the lever. That is, the moving speed and the changing speed of the size of the thumbnail displayed on the display change according to the position of the lever. The speed adjustment stage of the speed control lever may be two stages of a high speed and a low speed, or may be configured so as to be divided between a minimum speed and a maximum speed at a predetermined level or to change continuously.

For example, when the speed control lever has two positions, high speed and low speed, and when the speed control lever is low speed, the thumbnail image displayed on the display slowly moves from the center to the outer peripheral side. Further, the display size of the thumbnail image gradually increases.

In the present embodiment, when moving at a low speed, the types of sizes to be displayed are increased. For example, a size image such as 10%, 15%,..., 195%, 200% is displayed from 10% of the original thumbnail image size to 200% in increments of 5%. For example, when a certain thumbnail image is moved or enlarged after being displayed on the display, and the time during which the thumbnail image is not displayed on the display is less than or equal to 3 seconds or more, the display size is changed in small increments.

Conversely, when the moving and enlarging of a thumbnail image are fast, for example, when a certain thumbnail image is moved and enlarged after being displayed on the display and the time during which the thumbnail image is not displayed on the display is higher than the speed corresponding to less than 3 seconds, Reduces the types of thumbnail display sizes. For example, 200% in 10% to 20% steps of the original thumbnail image size
%, 10%, 30%,..., 170%, 190%. At this time, the display position of the thumbnail image is changed according to the original display rule. That is, the size of a certain thumbnail image displayed in the previous frame does not change in the next frame, and only the display position may be shifted. By doing so, it becomes difficult for human eyes to understand that the resizing process is omitted.

At this time, since there is no need to change the size of the image, the resizing process is not performed, and only the position of the corresponding thumbnail data in the display memory needs to be moved to the display position in the next frame. That is, the size at the previous display is stored, and the resizing process is not performed if there is no change from the currently displayed size. As a result, the load of the resizing process when moving at high speed is reduced. Similarly, when the user attempts to search (zoom out) for a thumbnail image in the future direction by operating the remote controller, the thumbnail displayed on the display moves from the outside toward the center and gradually becomes smaller.

In this case as well, for example, when a certain thumbnail image is moved and reduced after being displayed on the display, and is not displayed on the display at a speed equal to or longer than 3 seconds, the image is displayed in a fine step size. In addition, when the moving and reducing of the thumbnail image are fast, for example, when a certain thumbnail image is moved and reduced after being displayed on the display, and the time during which the thumbnail image is not displayed on the display is higher than a speed corresponding to less than 3 seconds, the above problem may occur. Displays a thumbnail image in increments.

The above selection process will be described with reference to FIG. For example, when the CPU 1 determines a speed instruction value from the remote controller 10, the CPU 1 determines a thumbnail image to be displayed, and determines a display size and a display position for each thumbnail image (step S161).

Next, it is determined whether or not the speed instruction value is equal to or higher than a predetermined speed (step S162). If the speed instruction value is equal to or higher than the predetermined speed, the display size is changed in 20% increments (step S163). On the other hand, if the speed is less than the predetermined speed, the display size is changed in steps of 5% (step S164). Then, it is determined whether the size displayed in the previous frame has changed from the display size (step S).
165). If the size is the same as the previous size, the resizing process is not performed, and the same thumbnail image displayed last time is drawn on the DRAM 2 while changing only the display position (step S167). On the other hand, if the display size has changed from the previous time, resizing processing and drawing processing on the DRAM 2 are performed (step S166). At this time, any of the above-described image quality priority resizing processing and speed priority resizing processing may be selected. One of the methods may be fixed and used, or one of the methods may be dynamically selected by the selection based on the moving speed in the first embodiment or the selection based on the display size in the second embodiment. Good.

After the drawing process is completed, it is determined whether or not the drawing to the DRAM has been completed for all the thumbnails to be displayed (step S168). If there is any undrawn thumbnail to be displayed, the process returns to step S162.
When the drawing processing of all the display target thumbnails is completed, the frame display processing ends. The processing of steps S161 to S168 is similarly repeated for the next and subsequent frames.

[0102]

[Other Embodiments] In the above embodiment, the case where the JPEG type is used as the image compression type has been described, but any other image compression type may be used in the present invention. In that case, the image compression / expansion unit 5 is configured to perform the corresponding compression / expansion processing.

The remote controller 10 may be of a type directly connected to the display device of the present invention or a type of wirelessly transmitting commands. In that case, the display device may be provided with an interface for wireless communication.

Further, in the above-described embodiment, only the horizontally long thumbnail image has been described, but it is needless to say that a vertically long thumbnail image may exist. In this case, the size may be determined by comparing both the number of vertical and horizontal pixels with the predetermined number of pixels.

The present invention can be applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a reader, a printer, a display, etc.), and can be applied to a single device (for example, a display function). , A copier, a facsimile machine, etc.).

Further, an object of the present invention is to provide a storage medium storing a program code of software for realizing the functions of the above-described embodiments to a system or an apparatus, and to provide a computer (or CPU) of the system or apparatus.
And MPU) read and execute the program code stored in the storage medium.

In this case, the program code itself read from the storage medium implements the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.

Examples of the storage medium for supplying the program code include a floppy disk, a hard disk, an optical disk, a magneto-optical disk, and an external storage device 40.
M, an external storage device 4, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

When the computer executes the readout program code, not only the functions of the above-described embodiment are realized, but also the OS (Operating System) running on the computer based on the instruction of the program code. ) May perform some or all of the actual processing, and the processing may realize the functions of the above-described embodiments.

Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, based on the instruction of the program code, It goes without saying that the CPU included in the function expansion board or the function expansion unit performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

[0111]

As described above, the following effects can be obtained by changing the resizing method according to the thumbnail display size and the moving speed.

First, since the amount of processing required for resizing can be reduced, inexpensive resizing processing blocks can be used. Further, the resizing process can be performed by software processing by the CPU.

Then, the bus occupancy required for resizing can be reduced, and other processing can be performed at high speed. That is, data can be read from an external storage device such as the external storage device 4 at high speed.
The amount of PEG decompression can be increased, and the number of thumbnail images that can be searched (displayed) per unit time can be increased.

As in the first embodiment, when performing thumbnail image enlargement / reduction processing, resizing with a small amount of processing is performed instead of high-quality resizing that is meaningless at high speed movement, and high-quality resizing at low speed. By doing
There is no need to have means for performing expensive and complicated high-speed resizing processing.

For example, when the CPU performs these resizing processes, the number of thumbnails searched per unit time decreases at low speeds.
, The total data amount read out from the memory decreases, and the amount of JPEG decompression also decreases. Therefore, the load on the CPU is reduced, and complicated but high-quality resizing can be performed.

Conversely, at high speeds, the resizing process is significantly reduced, so that much image data can be read from the external storage device, and JPEG decompression can be performed on many image data.

Also, as in the second embodiment, by changing the resizing method in accordance with the display size of the thumbnail images, the resizing method can be reduced compared to the case where the image quality priority resizing process is performed on all the thumbnail images. The required processing amount is reduced, and there is no need to have a means for performing an expensive, complicated, and high-speed resizing process. For example, resizing by software processing of the CPU becomes possible.

By performing the reduction by simple thinning when the display size is small, it is not necessary to access all the pixels of the original thumbnail image data, and the usage rate of the bus 9 can be reduced. Data transfer,
The usage rate of the bus 9 in processing such as JPEG decompression by the compression / decompression processing unit 5 can be increased. That is, the number of thumbnail images that can be searched in a unit time can be increased. In addition, high-quality resizing is performed on a large thumbnail image in which image quality is conspicuous, so that a high-quality image display device is obtained.

Also, as in the third embodiment, the following effects can be obtained by changing the step size of the displayed thumbnail image in accordance with the movement of the thumbnail image displayed on the display and the speed of enlargement / reduction. .

Even when the moving speed is high and the number of thumbnail images to be displayed per unit time is large, the load of the resizing process is small, so that more thumbnail images can be displayed. Therefore, the speed of movement, that is, the speed of search can be improved.

Further, a human can recognize the image more firmly when the image is moving slowly than when the image is moving fast. In the present embodiment, when the moving speed is low, the size is changed in small increments, so that a visually smooth image can be displayed. In other words, when moving at a low speed noticeable to the human eye, the image is displayed by smooth size change and movement.
At high speeds, it is difficult for the human eye to understand even if the display size is changed roughly.

As described above, in performing the enlargement / reduction processing of the thumbnail image, the resizing processing is reduced at the time of high-speed movement, and the proper resizing processing is performed at the time of low-speed movement. No need.

For example, when the CPU performs these resizing processes, the number of thumbnails searched per unit time decreases at low speeds.
And the total amount of data read from external storage devices
G The amount of thawing is also reduced. Therefore, the load on the CPU is reduced,
Complex but high quality resizing can be handled.

Conversely, at high speeds, the resizing process is significantly reduced, so that much image data can be read from the external storage device and JPEG decompression can be performed on many image data.

[Brief description of the drawings]

FIG. 1 is a main block diagram of an image display device according to the present invention.

FIG. 2 is a diagram showing a screen display example in the image display device of the present invention.

FIG. 3 is a diagram showing a data amount change in the embodiment of the present invention.

FIG. 4 is a diagram showing a pixel arrangement of a thumbnail image.

FIG. 5 is a diagram illustrating an example of a filter coefficient in an image quality priority resizing process.

FIG. 6 is a diagram illustrating a sub-sampling operation.

FIG. 7 is a diagram illustrating a sub-sampling operation.

FIG. 8 is a flowchart illustrating an initial display operation.

FIG. 9 is a flowchart illustrating a resizing process selection operation according to the first embodiment of the present invention.

FIG. 10 is a flowchart illustrating a resizing process selecting operation according to the second embodiment of the present invention.

FIG. 11 is a flowchart illustrating a resizing process selecting operation according to the third embodiment of the present invention.

FIG. 12 is a diagram illustrating a screen display method of a conventional image display device.

13 is a diagram illustrating a zoom operation in the image display method shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU 2 DRAM 3 DMA controller 4 External storage device 4 5 Image compression / decompression processing unit 6 Resizing processing unit 7 Video encoder 8 Display unit 10 Remote control unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 5/36 510 H04N 5/262 5C082 5/46 H04N 5/262 5/66 D 5/46 G06F 15 / 66 355D 5/66 G09G 5/00 520J 5/36 520E (72) Inventor Shunpei Kimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Takatoshi Suzuki 3, Shimomaruko 3 in Ota-ku, Tokyo 30-2 F-term (reference) in Canon Inc. BA14 BA17 BA24 BB04 BB13 BB19 BB25 5C082 AA01 AA36 AA37 BA12 BA41 BB15 BB25 BB44 CA21 CA33 CA34 CA52 CB05 DA51 DA87 MM02 MM10

Claims (20)

[Claims] 1. An image display apparatus for displaying a plurality of images while changing a display position and / or a display size of each of the plurality of images in accordance with a given condition, wherein First resizing means for generating image data of an arbitrary size from the original image data of the image; and arbitrary processing from the original image data of the image by a second processing method in which the image quality is less deteriorated than the result of the first method. A second resizing means for generating image data having a size of, and a selecting means for selecting one of the first or second resizing means in accordance with a predetermined condition and supplying the original image data. Characteristic image display device. 2. The frequency of processing for changing the display position and / or the display size changes according to the given condition, and the frequency of the processing per unit time exceeds a predetermined value. 2. The image display apparatus according to claim 1, wherein the first resizing means is selected when the error occurs, and the second resizing means is selected otherwise. 3. The selection means selects the first resizing means until the display size reaches a predetermined size, and selects the second resizing means when the display size exceeds a predetermined size. The image display device according to claim 1, wherein: 4. An image display device for displaying a plurality of images while changing a display position and / or a display size of each of the plurality of images according to a given condition, wherein the plurality of images are displayed according to the given condition. A display size change amount determining means for determining a change ratio of the display size, a size change detecting means for detecting whether a display size after the change is different from a display size before the change, and the size change detecting means For an image for which a change has been detected, the original image data of the image is enlarged or reduced according to the display size change amount determined by the display size change amount determination means, and the size change detection means detects a size change. Resizing means for outputting image data before change for an image not to be changed. 5. The frequency of a process of changing the display position and / or the display size changes according to the given condition, and the display size change amount determining unit determines that the frequency of the process per unit time is predetermined. 5. The image display device according to claim 4, wherein the first change ratio is determined when the value is equal to or less than the value, and the second change ratio is larger than the first change ratio otherwise. 6. An image display apparatus for displaying a plurality of images while changing a display position and / or a display size of each of the plurality of images according to a given condition, wherein the first processing method includes the steps of: First resizing means for generating image data of an arbitrary size from the original image data of the image; and arbitrary processing from the original image data of the image by a second processing method having a larger processing amount than the result of the first method. A second resizing means for generating image data of a size; and a selecting means for selecting one of the first or second resizing means in accordance with a predetermined condition and supplying the original image data. Image display device. 7. The frequency of a process of changing the display position and / or the display size changes according to the given condition, and the frequency of the process per unit time exceeds a predetermined value. 7. The image display apparatus according to claim 6, wherein the first resizing means is selected when the error occurs, and the second resizing means is selected otherwise. 8. The selecting means selects the first resizing means until the display size reaches a predetermined size, and selects the second resizing means when the display size exceeds a predetermined size. 7. The image display device according to claim 6, wherein: 9. An image display method for displaying a plurality of images while changing a display position and / or a display size of each of the plurality of images in accordance with a given condition, wherein the first processing method A first resizing step of generating image data of an arbitrary size from the original image data of the image, and an arbitrary size from the original image data of the image by a second processing method in which the image quality is less deteriorated than the result of the first method. A second resizing step of generating image data having a size of the following, and a selecting step of selecting one of the first or second resizing steps according to a predetermined condition and supplying the original image data. Characteristic image display method. 10. The frequency of processing for changing the display position and / or display size changes according to the given condition, and the frequency of the processing per unit time exceeds a predetermined value. 10. The image display method according to claim 9, wherein the first resizing step is selected in a case where the first resizing step is performed, and the second resizing step is selected otherwise. 11. The selecting step selects the first resizing step until the display size reaches a predetermined size, and selects the second resizing step when the display size exceeds a predetermined size. 10. The image display method according to claim 9, wherein: 12. An image display method for displaying a plurality of images while changing a display position and / or a display size of each of the plurality of images according to a given condition, wherein the plurality of images are displayed according to the given condition. A display size change amount determining step of determining a change ratio of the display size by using the above method; a size change detecting step of detecting whether or not the display size after the change is different from the display size before the change; For an image in which a change is detected, the original image data of the image is enlarged or reduced according to the display size change amount determined in the display size change amount determining step, and the size change detection step detects a size change. A resizing step of outputting image data before change for an image not to be changed. 13. The frequency of processing for changing the display position and / or display size changes according to the given condition, and the display size change amount determining step determines that the frequency of the processing per unit time is predetermined. 13. The image display method according to claim 12, wherein the first change rate is determined when the value is equal to or less than the value of the second change rate, and otherwise, the second change rate is larger than the first change rate. 14. An image display method for displaying a plurality of images while changing a display position and / or a display size of each of the plurality of images in accordance with a given condition, wherein the first processing method includes the steps of: A first resizing step of generating image data of an arbitrary size from the original image data of the image; and a second processing method having a larger processing amount than the result of the first method. A second resizing step of generating image data of a size; and a selecting step of selecting one of the first or second resizing steps according to a predetermined condition and supplying the original image data. Image display method. 15. The frequency of processing for changing the display position and / or display size changes according to the given condition, and the frequency of the processing per unit time exceeds a predetermined value. 15. The image display method according to claim 14, wherein the first resizing step is selected in the case where the first resizing step is performed, and the second resizing step is selected otherwise. 16. The selecting step selects the first resizing step until the display size reaches a predetermined size, and selects the second resizing step when the display size exceeds a predetermined size. 15. The image display method according to claim 14, wherein: 17. A storage medium storing a program that can be executed by an apparatus, wherein the apparatus that has executed the program changes a display position and / or a display size of each of a plurality of images according to given conditions. An image display device that displays the plurality of images while generating image data of an arbitrary size from original image data of the image by a first processing method; and the first method. A second resizing means for generating image data of an arbitrary size from the original image data of the image by a second processing method in which the image quality is less deteriorated than the result of the first and second methods; A storage means for selecting one of the resizing means, and for causing the resizing means to function as an image display device having a selection means for supplying the original image data. 18. A storage medium storing a program that can be executed by an apparatus, wherein the apparatus that has executed the program changes a display position and / or a display size for each of a plurality of images according to a given condition. An image display device that displays the plurality of images while changing the display size according to the given condition; and a display size change amount determining unit that determines a change ratio of the display size according to the given condition. Size change detection means for detecting whether the display size is different from the display size; and for the image in which the size change detection means has detected a size change, the image is displayed in accordance with the display size change amount determined by the display size change amount determination means. The original image data is output after being enlarged or reduced, and for the image in which the size change detecting means does not detect the size change, the image data before the change is Storage medium for causing to function as an image display device having a resizing means for force. 19. A storage medium storing a program that can be executed by an apparatus, wherein the apparatus that executes the program changes a display position and / or a display size of each of a plurality of images according to given conditions. An image display device that displays the plurality of images while generating image data of an arbitrary size from original image data of the image by a first processing method; and the first method. A second resizing means for generating image data of an arbitrary size from the original image data of the image by a second processing method having a larger processing amount than the result of the first and second processing methods; A storage medium characterized in that it functions as an image display device having one of resizing means and a selecting means for supplying the original image data. 20. A recording medium storing the image display method according to claim 9 as a program executable by an apparatus.