JPS62212691A - Image display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an image display device, and more specifically, the present invention relates to an image display device, and more specifically, to an arbitrary range of image data stored in an image memory that is larger than the display capacity of the display device. The present invention relates to an image display device that can quickly and easily display images.

[Prior art]

For example, when image data sent by a facsimile device is temporarily stored in an image memory and then displayed on a display device such as a CRT display, the resolution of the facsimile device is 8 tons in the main scanning direction (horizontal direction). n, the sub-scanning direction (vertical direction) is 7.7/m, and the information amount of 1728 x 2300 dots (1728
2300 bits of data).

By the way, it is not a good idea to use a display device that has the capacity to simultaneously display the entire image with the above-mentioned amount of data because it becomes large and expensive. , usually 1000 x 100
Many methods are used to partially display an image stored in an image memory on a display device with a display capacity of about 0 dots. Of course, in such a case, the display start position of the image data on the image memory on the display device is continuously moved and displayed by key operations on the keyboard or the like.

C Problems to be Solved by the Invention] However, in the conventional image display device as described above, when the display capacity of the display device is considerably smaller than the image data stored in the image memory, the overall Moving the image from one end of the image to the other end requires moving the image considerably on the display screen, which takes a considerable amount of time and requires the use of keys during this time. There was a problem that it was extremely troublesome, such as the need to continue the operation.

The present invention was made in view of these circumstances, and
An object of the present invention is to provide an image display device that can directly display any range of image data stored in an image memory.

[Means for solving the problem] In the present invention, by specifying an arbitrary point on the coordinate plane for inputting the display start position of the display start position input device, the corresponding address on the image memory is displayed. The configuration is such that the image data is immediately displayed on the display device as the starting position.

The present invention provides an image display device including a display device and an image memory that stores image data greater than display data of the display device, in which a display start address of image data stored in the image memory on the display device is provided. a display start position input device for specifying the coordinates of the display start position; a display position determining circuit that determines an address range of an image memory; and a display control circuit that reads image data from the image memory according to the address of the display range determined by the display position determining circuit and displays it on the display device. It is characterized by having the following.

[Effect]

In the present invention, since the image is immediately displayed on the display device with the position on the image memory corresponding to the point specified on the display start position input device as the display start position, there is no need for complicated key operations. The time it takes for the range to be displayed is also shortened.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof.

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

In the figure, 1 is a display start position input device 1, and an xy coordinate system is set on its input surface. A stylus pen 11 is attached to this display start position input device 1, and is used to indicate the display start position by bringing the tip of the pen into contact with the input surface 10 of the display start position input device 1. That is, when the tip of the stylus pen 11 touches an arbitrary display start position on the input surface 10, the input surface 1 at that position
The coordinate value (x,
y) is detected and output to the display position determining circuit 2.

Note that each maximum value (Xo, )'o of the x-y coordinate system set on the input surface of this display start position input device 10
) is < (320,640) as shown in FIG.

The display position determination circuit 2 converts the coordinate values (x, y) of the display start position given from the display start position input device 1 into the X-Y coordinate system of the memory brain of the image memory 3, which will be described later, and further converts this point into the X-Y coordinate system of the memory brain of the image memory 3. A display range is determined as the display start address of the image data stored in the image memory 3 on the display device, and the information is output to the display control circuit 4.

The display position determining circuit 2 is also provided with a clock circuit 6 as a clock means and a register 7 as a storage means. The clock circuit 6 inputs the coordinates (x,
When y) is input, counting of a predetermined time T is started. On the other hand, the register 7 inputs the coordinates (x, y) of the new display start position from the display start position input device 1 to the display position determination circuit 2.
is input, the above-mentioned timer circuit 6 calculates the predetermined time T.
If the same coordinate values (x, y) are still being input from the display start position input device 1 to the display position determination circuit 2 even after the predetermined time T has elapsed after starting time measurement, , is used to store the coordinate values.

The image memory 3 is for storing one screen of image data in its memory brain, and the addresses of the memory brain are expressed as an X-Y coordinate system, and their respective maximum values (XO2Yo) As shown in Fig. 3, it is possible to receive 54-size originals in a facsimile bag layer.
(1728, 2300).

The image data stored in the image memory 3 is given the coordinate value of the memory brain, that is, the address (X, Y).

The configuration is such that data Y) is output.

The display control circuit 4 reads out image data from the image memory 3 according to the display range information of the address as the X-Y coordinate system of the image memory 30 given from the display position determining circuit 2, and displays the image data on a CRT which is a display device. Give to display 5.

The display capacity of the CRT display 5 is as follows:
1000 x 1000 dots, display control circuit 4
Displays the image data stored in the image memory 3 provided from the image memory 3.

The operation of the image display device of the present invention configured as described above will be explained below.

First, assume that point A on the input surface 10 of the display start position input device 1 is designated as the display start position with the stylus pen 11, as shown in FIG. 4, for example.

The coordinate value of this point A on the x-y coordinate system of the input surface is (Xs, 71) - (50, 50).

The coordinate values (50, 50) of the display start position input to the display start position input device 1 are given to the display position determination circuit 2.

The display position determining circuit 2 is configured such that the x-y coordinate system set on the input surface 10 of the display start position input device 1 has the respective maximum values (xo +yo) - (320
, 640), and the X-Y coordinate system as the address set in the memory brain of the image memory 3 is the maximum value (Xo, Yo) of each as shown in FIG.
= (1728, 2300), the coordinate values (x,
y) to the address (X, Y) of the display start position on the image memory 3 using equations (1) and (2) below.

For example, the aforementioned point A (Xl, )' r ) = (
50, 50), the display start address (XI*Yt) on the image memory 3 is (270, 180), and the point (270, 180) on this image memory 3
When the display start address is set as the display start address, the display range of the image data on the image memory 3 on the display screen of the CRT display 5 is as shown in FIG.
0゜180) and address (X, Y) - (127
0,1180).

In this way, the display position determining circuit 2 determines the display range based on the display start address converted to the address (X, Y) of the image memory 3, and provides this information to the display control circuit 4.

The display control circuit 4 sequentially controls the CRT according to the address of the display range on the image memory 3 given by the display position determining circuit 2.
Image data for one screen of the display 5 is sent to the CRT display 5.

If point A with coordinate values (X+, )'I) = (50, 50) is determined as the display start position in the display start position input device 1 described above, then the corresponding point on the image memory 3 is determined. The address is (X, Y) - (270,
180), therefore, in the first horizontal synchronization period, image data for 1000 bits in the X direction from the address (270, 180) on the image memory 3 is displayed (data displayed on one horizontal scanning line on the display screen of the CRT display 5). (equivalent to 1000 dots), that is, (X, Y) - (12
70°180) and sends it to the CRT display 5 to be displayed on its first horizontal scanning line. During the next horizontal synchronization period, it moves +1 in the Y direction and reads the address (270, 181).
) in the same way, 1000 bits of image data in the X direction,
That is, (X, Y) - (1270, 181) is read out and displayed on the next horizontal scanning line of the CRT display 5.

Thereafter, while increasing the value of Y by +1, display is performed sequentially by -horizontal scanning line, and the address (X+
, Yl) - (270, 180) as the display start address, image data in a range of 1000 bits each in both the X and Y directions is displayed on the CRT display 5.
ox 1ooo is displayed on Don't's display screen.

By the way, while an image is displayed on the CRT display 5 as described above, when the position 11 (x+, y+) of the display start position is input from the display start position input device 1 to the display position determination circuit 2, the clock circuit 6 starts counting the predetermined time T. If the coordinate values (xl, y+) are still being output from the display start position input device 1 to the display position determining circuit 2 even after the elapse of the predetermined time T, the display position determining circuit 2 The value (X+,)'+) is stored in register 7. Then, after the predetermined time T has passed,
Coordinate values of the display start position from the display start position input device (
x, y), the display position determination circuit 2 uses the coordinate values (X+, )'+) stored in the register 7 as the coordinate values of the display start position. Perform processing.

That is, in this case, the 1iIrR that has been displayed up to that point will continue to be displayed on the display screen of the CRT display 5.

On the other hand, when a signal of new coordinate values (x2.)'z) specifying the display start position is input from the display start position input device 1, the corresponding image stored in the image memory 3 Among the data, the coordinates on image memo I73 (X21
1 each in the X and Y directions with Y2) as the display start position.
Image data in the range of 000 bits is displayed, but after the image timing circuit 6 starts counting the predetermined time T, the display start position input device 1 inputs the data to the display position determination circuit 2 before the predetermined time T elapses. Coordinate values (Xz, yz)
When the signal is stopped, in other words, when the designation of the display start position is stopped, after the predetermined time T has elapsed, the display position determining circuit 2 performs the above-mentioned process to register the register 7.
The coordinate value (xl.

y+) one after another, and then display start position input device 1
A signal of the coordinates (x313+3) of a new display start position is input from , and processing is performed using this coordinate value (X+, 7+) as the specified display start position.

Therefore, for example, if the same display start position has already been designated from the display start position input device 1 for a predetermined time T or more, and then another position is designated as the display start position for a time within the predetermined time T, The image is displayed on the CRT display 5 for a predetermined time T with the (-) position as the display start position, and after the elapse of the predetermined time T, the previously displayed image is displayed again.

〔effect〕

As described above (according to the present invention, the address on the image memory corresponding to the position specified by the display start position input device among the image data stored in the image memory is displayed as the display start address). Image data corresponding to the display capacity of the device is immediately displayed on the display device.Therefore, when displaying a desired screen range on the display device by continuously moving the screen like in the past, In comparison, it becomes possible to display a desired screen within a short time.

Furthermore, in the above embodiment, by continuously moving the designation of the display start position to the display start position input device,
As with conventional devices of this type, it is possible to continuously move the displayed image.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram showing the configuration of an image display device according to the present invention, and FIG. 2 is a block diagram showing the configuration of an image display device according to the present invention. -A schematic diagram showing the y coordinate system, Fig. 3 is a schematic diagram showing the X-Y coordinate system set in the image memory, and Fig. 4.5r
yJ is a schematic diagram for explaining the operation of the device of the present invention. 1...Display start position input device 2...Display position determining circuit 3...Image memory 4...Display control circuit 5...CRT display patent Applicant = Yodenki Co., Ltd. agent Patent attorney Kawa Noboru Fire Brother 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In an image display device comprising a display device and an image memory that stores image data greater than display data of the display device, the image data stored in the image memory is transferred to the display device. a display start position input device for instructing a display start address of the image using its coordinates; and a display start position input device for converting the coordinates inputted into the display start position input device into an address of the image memory, and inputting the coordinates to the display device based on this address. a display position determining circuit that determines an address range of the image memory to be displayed; and a display position determining circuit that reads image data from the image memory according to the address of the display range determined by the display position determining circuit and displays this on the display device. An image display device comprising: a display control circuit. 2. The display position determining circuit includes: a timer for starting a predetermined period of time each time the coordinates of a new display start position are input from the display start position input device; and a storage means; If input of coordinates of the same display start position from the device continues for more than the predetermined time, the coordinates of the display start position are stored in the storage means, and the same display start position is input from the display start position input device. If the input of position coordinates is less than the predetermined time, the coordinates of the display start position stored in the storage means are outputted from the display start position input device after the predetermined time has elapsed. An image display device according to claim 1, characterized in that: