JPH01243184A - Picture display device - Google Patents

Abstract

PURPOSE:To execute a moving picture display with a smooth movement and a still picture display with an excellent picture quality by executing the moving picture display based on irreversible compression processing data and executing the still picture display based on reversible compression data. CONSTITUTION:When a stopping signal is inputted from an input means 9, corresponding data reversible compression processing data are read out of a second storing means 2b under the controls of control means 8a and 8b, and the still picture display is executed by a display means 7 based on the data. Namely, by the data in the second storing means 2b, the degree of a deterioration is small in comparison with a picture quality deterioration due to a compression processing. Consequently, the moving picture display can be executed based on data irreversible compression processing data in a first storing means 2a, and the still picture display cab be executed based on the data in the second storing means 2b. Thus, the moving picture display with the smooth movement and the still picture display with the satisfactory picture quality can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an image display device that displays an image based on captured image data.

(Prior Art) A moving image can be displayed by switching and displaying a plurality of consecutive images on a CRT display. In order to express the smooth movement of a moving image in this moving image display, it is better to have a larger number of displayed images (number of frames) per unit time.

For example, it is preferable to display 30 or more images per second. One possible method for increasing the number of images displayed per unit time is to import image data whose data amount has been significantly reduced through irreversible compression processing, sequentially expand the data, and display the data.

However, when image data whose data amount has been significantly reduced through irreversible compression processing is expanded and displayed, even if the image is okay as a video, if the video display is stopped and displayed as a still image, However, the drawback is that there is noticeable deterioration in image quality due to irreversible compression processing. The still image in this case is often a meaningful image, and therefore, it is desirable that the still image be of high image quality.

(Problems to be Solved by the Invention) As described above, when image data processed by irreversible compression processing is used to increase the number of images in a moving image display, even if the image has no particular problem as a moving image, still images may be used. When used as a display, there is a drawback that image quality deterioration is noticeable.

SUMMARY OF THE INVENTION The present invention aims to eliminate the above-mentioned drawbacks, and its purpose is to provide an image display device that can display moving images with smooth motion and display still images with good image quality. .

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, an image display device according to the present invention includes a first storage means for storing data obtained by compression processing for a plurality of images; An image display device having an expansion means for expanding data in the first storage means, a display means for displaying a moving image based on the expanded output, and an input means for inputting a stop signal instructing to stop displaying the moving image. In,
a second storage means for storing only a specific image among moving image display images in a state where the degree of image quality deterioration is less than that caused by the compression processing; The apparatus includes a control means that reads data and enables still image display based on this data.

(Function) When a stop signal is input from the input means, the corresponding data is read from the second storage means under the control of the control means, and based on this data, a still image is displayed on the display means. Display is performed.

According to the data in the second storage means, the degree of image quality deterioration is less than that caused by the compression processing, so that still images can be displayed with good image quality. Therefore, in the image display device according to the present invention, it is possible to display a moving image with smooth movement based on the data in the first storage means, and to display a moving image with good image quality based on the data in the second storage means. Still images can be displayed.

(Example) Hereinafter, the present invention will be specifically explained with reference to Examples.

FIG. 1 shows an embodiment of an image display device according to the present invention.

In the figure, 2 is an image memory, and this image memory 2 is functionally divided into a first storage means 2a and a second storage means 2b.
and has.

The first storage means 2a stores compressed data for a plurality of images to be displayed as a moving image. This compressed data is taken in via the communication interface 1.

In order to increase the number of images displayed per unit time in moving image display, irreversible compression processing is used in the above compression processing.

Further, the second storage means 2b stores only a specific image among the plurality of images for displaying a moving image in a state where the degree of image quality deterioration is less than that caused by the above-mentioned irreversible compression processing. In this embodiment, an image that is determined to be meaningful when displayed as a still image from among a plurality of images for displaying a moving image is subjected to reversible compression processing and is transmitted via the communication interface 1. and written into two second storage means.

After the image memory 2, a distributor 3. First stretcher4.
A second expander 51 selector 6 and a display section 7 are arranged. The distributor 3 switches the data transfer path, and the first decompressor 4 converts the data (irreversibly compressed data) transferred from the first storage means 2a via the distributor 3. The second decompressor 5 performs decompression processing.
It is for decompressing the data (reversibly compressed data) transferred from the second storage means 2b via the distributor 3. However, the first thing. The output processed by the second decompressor 4.5 is selectively selected by a selector 6 and displayed on a display section 7.

The operations of the address control 1 distributor 3 and selector 6 of the image memory 2 are controlled by an address controller 8a. This address controller 8a is under the control of the system controller 8b. The system controller 1-roller 8b receives a signal from the input unit 9 that instructs to start displaying a moving image (this is referred to as a 1 start signal) and a signal that instructs to stop displaying a moving image (this is referred to as a ``stop signal''). ) is now being input. The system controller 8b sends a start trigger to the address controller 8a by inputting a start signal, and by inputting a stop signal,
A stop trigger is sent to the address controller 8a. Here, the input means in the present invention is the input section 9.
This is realized by Next, the detailed configuration of the address controller 8a will be explained with reference to FIG.

As shown in the figure, the address controller 8a has a first address register 10. Counter 11. Table memory 12.
It has a selector 13. In the table memory 12,
As shown in FIG. 3, address 1 of reversibly compressed data
4 and flag 15 is formed. This table is formed in relation to the second storage means 2b.

That is, when the reversible compression processing data is written into the storage means 2b, the write address of the data is written into the table memory 12, and at the same time, the 7 lag 15 is set to 11.
” is set. Therefore, based on this table information, the second
It can be determined whether or not the corresponding image data (reversible compression processing) exists in the storage means 2b. The counter 11 counts images by using the value held in the head address register 10 as an initial value in response to a start trigger input, and this count output is input to the selector 13 and table memory 12.

The selector 13 is activated by a stop trigger input, and selects the counter 1 according to the state of the flag at that time (1 or O).
1 or the output of table memory 12 and sends it to image memory 2.

Further, the flag information is transmitted to the distributor 3 and the selector 6.

Note that the control means in the present invention is the address controller 8.
a and the system controller 8b.

Next, the operation of the embodiment device configured as described above will be explained.

First, image data that has been subjected to irreversible compression processing and image data that has been subjected to reversible compression processing are transferred to the first image memory 2 via the communication interface 1 . Second storage means 2a, 2
b, respectively.

FIG. 4 shows images handled by the apparatus of this embodiment. No. O to No. 255 are image numbers.

No, O to No, 7 (AI to A8) and No,
Images No. 8 to No. 15 (81 to 88) are consecutive images, which are irreversibly compressed and transferred to the apparatus of this embodiment, and written into the first storage means 2a.

If A3 and A4 of A1 to A8 and B3 and B4 of B1 to B8 are meaningful images in still image display, they are reversibly compressed (A3').

A4', B3', and B4') are transferred to the apparatus of this embodiment and written into the second storage means 2b.

When writing data to the second storage means 2b, the address controller 88 writes the corresponding A3', A4', and B3' in the table memory 12.

A table for 84' is formed (see Figure 3).
i Video display is performed as follows.

A signal (start signal @
) is input, the first
Data in the storage means 2a (irreversible compressed data)
is read out, taken into the first decompressor 4 via the distributor 3, decompressed there, and then sent to the display unit 7 via the selector 6. Since the compressed data of the continuous images A1 to A8 or B1 to B8 are sequentially expanded and taken into the display section 7, the display section 7 performs a high-speed switching display of the continuous images, that is, a moving image display. In this moving image display, the address controller 8a operates as follows.

That is, in the address controller 8a, the start address is set to the start address register 10 in FIG.
The counter 11 operates in response to the start trigger input and starts counting up images. The counting output (address output) of this counter 11 is sent to the image memory 2 via the selector 13.
will be forwarded to.

Based on this address, data in the first storage means 2a in the image memory 2 is sequentially read out.

Next, still image display will be explained.

When a signal (stop signal) instructing to stop displaying the moving image is input from the input unit 9, a stop trigger is output from the system controller 8b. Then, the count-up of the counter 11 is stopped and the selector 13 is activated. At this time, data in the table memory 12 is read using the output of the counter 11 as an address. If the flag is 11'', this means that the reversibly compressed data of the image corresponding to the image displayed on the display unit 7 when the stop signal is input exists in the second storage means 2b.
The selector 13 selects the output of the table memory 12 and sends it to the image memory 2. As a result, the corresponding data is read out from the second storage means 2b of the image memory 2. Furthermore, the flag [11 puts the distributor 3 in a state where it can transmit the output data of the image memory 2 to the second decompressor 5, and the selector 6 can transmit the output of the second decompressor 5 to the display section 7. state. Therefore, the data read from the second storage means 2b is taken into the second decompressor 5 via the distributor 3, and after being decompressed there, is transmitted to the display unit 7 via the selector 6. The still image will be displayed. This still image has high image quality because it is based on reversibly compressed data.

On the other hand, in the output of the table memory 12, the flag r
In the case of OJ, this means that the reversibly compressed image data corresponding to the image displayed on the display unit 7 when the stop signal is input does not exist in the second storage means 2b. The output of will be selected. Therefore, on the display section 7, the last image among the images = 12- that were provided for the previous moving image display is displayed as a still image. Since the still image in this case is based on non-inversely compressed data, image deterioration is noticeable.

However, this image is meaningless even when displayed as a still image, and most stop signal inputs are thought to be made when a meaningful image is displayed as a moving image instead of a still image. It does not actually cause any inconvenience.

In this way, in the device of this embodiment, moving images are displayed based on irreversibly compressed data, and still images are displayed based on reversibly compressed data, so it is possible to display moving images with smooth movement. At the same time, still images can be displayed with excellent image quality. This allows practical handling of both moving images and still images, thereby improving diagnostic performance. Further, since the reversibly compressed data of only images that are meaningful in still image display is written into the second storage means 2b, it is possible to avoid increasing the size of the image memory 2.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above-mentioned embodiment, and that various modifications are possible.

In the above embodiment, a case has been described in which image data is taken in via the communication interface 1, but application to a stand-alone system is also possible. FIG. 5 shows an embodiment in this case. Irreversible compressed data and reversible compressed data are stored in an image storage device 17 such as a magnetic disk, and are transferred to the image memory 2 as needed.

External structures other than this storage device 17 and their functions are the same as in the above embodiment.

Further, in the above embodiment, the reversibly compressed data is written in the second storage means 2b, but the data (irreversibly compressed data) in the first storage means 2a is stored in the second storage means 2b. However, it is sufficient to write data in a state where the degree of image quality deterioration is small, and data other than reversibly compressed data may be used. For example, it may be original image data, or it may be irreversibly compressed data that prioritizes image quality over compression rate (that is, data obtained by irreversible compression processing at a low compression rate). Note that the second decompressor 5 is not required when writing original image data into the second storage means 2b, and when writing irreversibly compressed data that prioritizes image quality over compression rate. The processing in the second decompressor 5 corresponds to the compression method, and is used as the decompression process for irreversibly compressed data.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an image display device that can display moving images with smooth movement and display still images with good image quality.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the image display device according to the present invention, FIG. 2 is a detailed block diagram of the main part of FIG. 1, and FIG. 3 is an explanatory diagram of the table memory in FIG. 2. , FIG. 4 is an explanatory diagram of images handled by the apparatus of this embodiment, and FIG. 5 is a block diagram showing another embodiment. 2... Image memory, 2a... First storage means, 2b
...Second storage means, 7.Display unit (display means), (8a, 8b)...Control means, 9.Input section (input means). Agent Patent Attorney Masayoshi Misawa AC
Q Meshigegakenden) Text A R Kata Song O Shima Sp qx

Claims (3)

[Claims] (1) A first storage means for storing data resulting from compression processing for a plurality of images, an expansion means for expanding the data in the first storage means, and a display means for displaying a moving image based on the expanded output. and input means for inputting a stop signal instructing to stop displaying the moving image, in which only a specific image among the images for displaying the moving image is in a state where the degree of image quality deterioration is less than that caused by the compression processing. and a second storage means for storing the information at the stop signal.
1. An image display device comprising: a control means for reading out relevant data from a storage means and displaying a still image based on this data. (2) The image display device according to claim 1, wherein the data in the first storage means is irreversibly compressed data of an image for displaying a moving image. (3) Claim 1 or 2 wherein the data in the second storage means is original image data, reversibly compressed data, or irreversibly compressed data at a low compression rate of only a specific image among moving image display images. The image display device described.