JPH02299018A - Image display device - Google Patents

Abstract

PURPOSE:To speed up data processing by storing only image data at a position and in an area which are specified by a main controller on a memory device with a display memory control part through a memory device control part and utilizing the storage area effectively. CONSTITUTION:When the main controller 3 issues an instruction for reading an image file (i) out of the memory device 1, the memory device control part 2 reads attribute data out of a directory part in the device 1 and further reads image data (=image file (i)) out of an image data part by an amount DELTAxiXDELTAyi in an address indicated by a pointer Pi. Then pieces of extraction information xi, yi, DELTAxi, and DELTAyi of an image among the read data are transferred to a control part 8 and the image data are transferred to a display memory 4. The image data are written on the memory 4 by a control part 5 and the control part 8 sends the image data DELTAxi and DELTAyi to the memory 4 and writes the image data of the file (i) on the memory 4. The image data are read out by a control part 5, transferred to a display part 6, and displayed by a control part 7.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is capable of storing only necessary image data written in a display memory in a storage device, and reading out and displaying only this data as necessary. The present invention relates to an image display device.

[Conventional technology]

FIG. 5 is a block connection diagram showing a conventional image display device. In the figure, 1 is a storage device, 2 is a storage device control unit that controls the storage device 1, 3 is a main controller, and 5 is a connection to a display memory. A read/write control unit that controls reading and writing of data; 4 a display memory that stores image data for display or externally input image data; 7 a display unit that displays image data; The display control unit 6 to control is controlled by the display control unit 7,
This is the above-mentioned display unit that displays image data.

Next, the operation will be explained. First, assuming that the capacity of the display memory 4 is υ, the image data of the image A input from the outside is transferred to the read/write control unit 5 (hereinafter referred to as the R/W control unit 5) under the command of the main controller 3. ) is written into the display memory 4. Next, the image data written in the display memory 4 by the main controller 3 and the R/W control unit 5 is read out from the display memory 4 as an image file i (file name i), and as shown in FIG. The data is transferred to and stored in the storage device 1 under the control of the storage device control section 2 . At this time, one image file i is stored in the image data portion of the storage device 1 at the address indicated by the pointer P (logical block address) given by the file name i, as shown in FIG. Further, the file name i is stored in a directory section in the storage device 1. The data size of the stored image file i is
It is equal to the memory capacity υ of the display memory 4. In this way, image data is stored in the storage device 1, and at this time, a pointer P indicates the address to be stored. can be expressed by the following equation since the size of the image data is fixed (=υ).

Pn=P□+ (n-1)Xu Po: The operation of reading image data from the storage device 1 will be explained using the starting address method of the image data storage area. Now, image A is stored in the storage device 1 as an image file i, and when the main controller 3 gives a command to read the image file i (file name i) to the storage device control unit 2, the image A is stored in the storage device 1 as an image file i. The image A of the image file i stored at the address indicated by the pointer value is read out from the storage device 1. At this time,
The read image file i (=size and data amount of image A) is υ. In this way, the read image file i is written into the display memory 4 by the R/W control section 5. Further, the data of the image file i written in the display memory 4 is read out by the R/W control section 5 and displayed as image A on the display section 6 under the control of the display control section 7. The image A read out from the storage device 1 and displayed in this manner is exactly the same as the image A imported from the outside, as shown in FIG.

[Problem to be solved by the invention]

Since the conventional image display device is configured as described above, the image data written to the display memory 4 having a capacity of υ is stored as is in the storage device 1, and the size of one image data is smaller than the display memory. 4, and the number of image data (= number of image files) that can be stored in the storage device 1 is limited, and the necessary and unnecessary parts of one image data are completely unrelated. There were problems such as not being able to increase the processing speed because all of the data was stored and the amount of data υ described above was processed each time.

This invention was made in order to solve the above-mentioned problems, and makes it possible to extract only the necessary part from one image data, thereby making it possible to arbitrarily determine the size of the image data. The purpose of the present invention is to provide an image display device that can reduce the storage area occupied by one image data in a storage device and speed up data processing while effectively utilizing the storage area. do.

[Means to solve the problem]

The image display device according to the present invention writes image data from an external device or a storage device into a display memory, controls reading and writing of the image data to the storage device by a storage device control section, and further comprises: The reading/writing of the above-mentioned image data can be controlled by a read/write control section, and the image data read out here can be displayed on the display section, while the image data written in the display memory can be displayed on the display section. By outputting image extraction data from the main controller to the display memory control unit, which extracts data of the required position and size, only the extracted and selected image data is transferred to the storage device, along with the image extraction data. It is designed so that it can be stored.

[Effect]

The display memory control section of the present invention allows only image data of a position and area designated by the main controller to be stored in the storage device through the storage device control section, and therefore greatly reduces the amount of data exchanged through the storage device. This makes it possible to speed up data processing up to the display of image data.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a storage device such as an optical disk device, 2 is a storage device control unit that controls data reading and writing operations for the storage device 1, 3 is a main controller, and 4 is image data imported from outside or the storage device 1 5 is an R/W control unit that controls data reading and writing operations for the display memory 4; 6 is a display that externally displays the data written in the display memory 4; 7 is a display control section that controls the display section 6, and 8 is a display memory control section that cuts out image data to be stored in the storage device 1.

Next, the operation will be explained. Assuming that the image data written in the display memory 4 is an image A as shown in FIG. 2, the display control section 7 displays this image as it is on the display section 6. Here, display memory 4
Assuming that there is a one-to-one correspondence between the display section 6 and the display section 6, in the above image A.

The operation of storing only the necessary portion in the storage device 1 will be explained. The display memory 4 is controlled by an R/W control section 5 and a display memory control section 8 under the control of the main controller 3. That is, as information for extracting the necessary part of the image A from the main controller 3, x++ y++IU as shown in FIG.
x++lJy+ is given to the display memory control section 8. Here, X+tyI is the position of image A, ΔX I FΔy,
is information indicating the size of image A. On the other hand, the data of the image A written in the display memory 4 by the R/W control unit 5 is read out pixel by pixel. At this time, based on the image extraction information, the display memory control unit 8 selects X ly 3' I t A X l t Ay,
Only the data corresponding to the portion indicated by 5 is transferred to the storage device #control unit 2, and the other data is not transferred. At this time, along with the extracted image data, the extracted information
+'/i is Oxl, Jy+ is storage device control unit 2
will be forwarded to. Here, a file name is given to the image data (=file name i), and as shown in FIG. 4, the image data is given as image file i, file name i, extraction information X l + '/ l +ΔX++/! In other words, in the storage device 1, file name i, extraction information X++ yl, IJXl,
I! 1Iyi is stored in the directory section, and the extracted image data is stored as image file i in the image data section.The starting address of the area where image file i is stored is indicated by pointer P, and is given by the following formula. .

PL=P□+P+-r+cAx+-t+1!
! y I - t) Po: starting address of image data storage area and this pointer PI is also stored in the directory section as attribute data of file name i 0 Next, storage device 1
The operation of calling up and displaying image data stored in the .

First, when the main controller 3 gives a command to call up an image file i in the storage device 1, the storage device control unit 2 retrieves attribute data ( Extract information x1.yI, zxI, 711IyI, and pointer P+
) is read out, and further, image data (=image file i) corresponding to the size of Δx IXIJy + at the address indicated by pointer P1 is read out from the image data section. Storage device 1
Among the attribute data read from the image, Xlt y+ydX+, 7!, which is image extraction information. Iyl is transferred to the display memory control section 8, while image data is transferred to the display memory 4. Then, the image data is written to the display memory 4 pixel by pixel by the R/W control unit 5, and the display memory control unit 8 writes the data to the display memory 4 pixel by pixel.
Image data of 4X IXdyl is sent starting from I t 3' I, and unrelated data such as 0 is sent to other parts. As a result, the display memory 4 contains
, yl, ΔX 1r AY +, the image data of the image file i is written only in the portion corresponding to ΔX 1r AY +, and nothing is written in the other portions, or irrelevant data such as O is written in the other portions. Therefore, such image data written in the display memory 4 is read out pixel by pixel by the R/W control section 5, transferred to the display section 6, and then read out pixel by pixel by the R/W control section 5.
Displayed by The image displayed at this time is image A' shown in FIG.

In the above embodiment, an optical disk device is used as the storage device 1, but other storage devices such as a hard disk device or a floppy disk device may be used, and the same effects as in the above embodiment can be obtained.

Moreover, one image data may be document data.

〔Effect of the invention〕

As described above, according to the present invention, only the image data of the position and area specified by the main controller is
Since the display memory control unit is configured so that data can be stored in the storage device through the storage device control unit, the amount of data exchanged through the storage device can be reduced, and data processing from reading and writing image data to display can be accelerated. It has the effect of getting something.

[Brief explanation of drawings]

FIG. 1 is a block connection diagram showing an image display device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing an image data writing method and reading method according to the present invention, and FIG. 3 is an explanatory diagram showing an image data writing method according to the present invention. FIG. 4 is an explanatory diagram showing a data structure in a storage device of the present invention. FIG. 5 is a block connection diagram showing a conventional image display device. FIG. 6 is a diagram showing a conventional image data FIG. 7 is an explanatory diagram showing a data structure in a conventional storage device. FIG. 8 is an explanatory diagram showing a conventional method for reading and writing image data. 1 is a storage device, 2 is a storage device control section, 3 is a main controller, 4 is a display memory, 5 is a read/write control section, 6 is a display section, and 8 is a display memory control section. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Co., Ltd. Agent Patent attorney 1) Hiroshi Sawa (2 others)

Claims (1)

[Claims] a display memory into which image data imported from the outside or image data read out from a storage device is written; a storage device control unit that controls reading and writing of image data to the storage device; and a storage device control unit that controls reading and writing of image data to the display memory. A read/write control unit that controls writing, a display unit that displays the image data written in the display memory, and a required position and size of the image data written in the display memory. Based on the image extraction data from this main controller, only the data extracted from the image data in the display memory is transferred to the storage device, and the image extraction data is output to the storage device. An image display device comprising: a display memory control unit that transfers data together with the image display device;