JPH0816808A - Picture display device/method - Google Patents

Abstract

PURPOSE:To provide a picture display device which can display a picture so that the movement becomes smooth without high writing capacity and high transfer capacity for the picture which shifts with the lapse of time being requested. CONSTITUTION:Bit map pictures 201 and 203 stored in RAM are binary bit maps consisting of 32 picture elements X32 picture elements. White picture elements show '0', and black picture elements show '1'. The bit map picture 201 is read by thinning the picture elements one by one in a vertical direction and a lateral direction. Then, the bit map picture 202 is obtained by doubling the picture which is read by thinning the picture elements in the vertical direction and the lateral direction. Namely, the resolution of the bit map picture 202 becomes the half of the bit map picture 201. The bit map picture 202 whose resolution is converted into the half is written into a from memory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device and an image display method for continuously displaying images.

[0002]

2. Description of the Related Art Conventionally, a computer has been provided with a function of continuously displaying images.

Next, a computer system having a function of continuously displaying this image will be described with reference to the drawings. FIG. 7 is a block diagram showing the configuration of a conventional computer system having a function of continuously displaying images.

A computer system having a function of continuously displaying this image has a ROM 7 as shown in FIG.
A CPU 701 that performs calculation and processing based on a program stored in 02.

RAM 7 during calculation and processing by CPU 701
03 is used as a work area, and the RAM 703 stores the bitmap image for display together with the calculation and processing results of the CPU 701.

Information and instructions are given to the CPU 701 from a keyboard 705 having operation keys via a CPU bus 704, and a mouse 706 which is a pointing device is connected to the keyboard 705.

The bitmap image stored in the RAM 703 is read by the CPU 701. RAM7
The bitmap image read from the CPU 03 is the CPU 701.
Frame memory 70 via CPU bus 704
The bitmap image written in No. 7 and written in the frame memory 707 is supplied to the CRT 709 via the video bus 708. The CRT 709 displays the supplied bitmap image.

Next, the display operation of the bitmap image will be described with reference to the drawings. 8 is a diagram showing a screen display example of a bitmap image in the computer system of FIG. 7, and FIG. 9 is an RA in the computer system of FIG.
FIG. 10 is a diagram for explaining an example of reading the bitmap image from M to the frame memory, and FIG. 10 is a diagram for explaining another example of reading the bitmap image from the RAM to the frame memory in the computer system of FIG. Is.

First, the RAM 703 temporarily stores the bitmap image generated by the processing of the CPU 701 and the like. The bitmap images stored in the RAM 703 are sequentially written in the frame memory 707, and the bitmap images written in the frame memory 707 are sequentially read out. The read bitmap image is C
The bitmap image is supplied to the RT 709 and displayed on the screen of the CRT 709.

For example, as shown in FIG.
Bitmap images 901, ..., 907 are stored in
Of the seven bitmap images 901, ..., 907, four bitmap images 901, 903, 905, 907 are sequentially stored in the frame memory 707 for 6 seconds in the frame memory 707.
It is written as 11.

Bit map images 908, 909, 910 and 911 written in the frame memory 707 are shown in FIG.
As shown in, the clock images 803, 804, 805, and 806 are sequentially displayed at corresponding display positions on the screen 807 of the CRT 709.
The display positions of 5,806 move as time passes.
Clock images 803, 804, 80 displayed on screen 807
5, 806 appear to be moving along trajectory 802. In the figure, a clock image 803 is a bitmap image 908, and a clock image 804 is a bitmap image 909.
The clock image 805 corresponds to the bitmap image 910, and the clock image 806 corresponds to the bitmap image 911.

On the other hand, for example, as shown in FIG. 10, the RAM 703 stores bitmap images 1001 ,.
1007 is stored, and bitmap images 1001, ...,
1007 sequentially stores the bitmap images 1008, ..., In the frame memory 707 at intervals of 1 second.
It is written as 1014.

The bitmap images 1008, ..., 1014 written in the frame memory 707 are displayed as clock images 803, 804, 805, 806 at corresponding display positions on the screen 807 of the CRT 709, as shown in FIG. . The display position of each clock image 803, 804, 805, 806 moves according to the passage of time. In the figure, a clock image 803 is a bitmap image 1008, a clock image 804 is a bitmap image 1010, and a clock image 805.
Corresponds to the bitmap image 1012, the clock image 806 corresponds to the bitmap image 1014, and the clock images corresponding to the bitmap images 1009, 1011 and 1013 are displayed, but the display is omitted. Clock images 803, 804, 805 displayed on the screen 807
806 appears to be moving along trajectory 801.

[0014]

However, in the former method in the conventional system, seven bitmap images 9 are used.
Four bitmap images 90 out of 01, ..., 907
1, 903, 905, and 907 in the frame memory 707 and the bitmap images 908 and 90 in the frame memory 707.
Since it is written as 9,910,911, the CPU 701
A high writing capability to the frame memory 707 and a high forwarding capability of the CPU bus 704 are not required.
Clock images 803, 804, 805, 8 displayed on 07
06 appears to be moving along trajectory 802,
The displayed image does not move smoothly.

In the latter method, the seven bit map images 1001, ..., 1007 are written in the frame memory 707 as bit map images 1008, ..., 1014, so that the clock images 803, 804, 804 displayed on the screen 807 are written.
805 and 806 appear to be moving along the trajectory 801, and the display image moves smoothly, but the CPU 7
01 writing capability to the frame memory 707 and CPU
High transfer capability of the bus 704 is required.

An object of the present invention is to provide an image display device capable of displaying an image so that its movement is smooth without requiring a high writing ability and a high transfer ability for an image moving with time. And to provide an image display method.

[0017]

According to the first aspect of the present invention,
An image display device for continuously displaying images on a display means, a storage means for storing a series of images, and a selection means for selecting a predetermined image from the images stored in the storage means according to the elapsed time. And read means for reading the selected image from the storage means while converting its resolution, and control means for controlling the display position of the read image on the display means according to the elapsed time. Is characterized by.

According to a second aspect of the present invention, in the image display method for continuously displaying images on the display means, the step of storing a series of images in the storage means, and the step of storing the images in the storage means A step of selecting a predetermined image according to the elapsed time; a step of reading the selected image from the storage means while converting the resolution thereof; and a display position of the read image on the display means for the elapsed time. And a step of controlling according to the above.

[0019]

In the image display device according to the present invention, a series of images are stored in the storage means, and a predetermined image is selected from the images stored in the storage means by the selection means according to the elapsed time and read out. The means reads the selected image from the storage means while converting its resolution, and the control means controls the display position of the read image on the display means according to the elapsed time.

In the image display method according to the second aspect, a series of images are stored in the storage means, a predetermined image is selected from the images stored in the storage means according to the elapsed time, and the selected image is selected from the storage means. The read image is read while converting its resolution, and the display position of the read image on the display means is controlled according to the elapsed time.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing the arrangement of a computer system constituting the first embodiment of the image display apparatus of the present invention.

As shown in FIG. 1, the computer system which constitutes the image display device of this embodiment is a computer system which performs calculation and processing based on a program stored in the ROM 102.
The PU 101 is provided.

RAM 1 during calculation and processing by CPU 101
03 is used as a work area, and the RAM 103 stores a bitmap image for display together with the result of the calculation and processing of the CPU 101.

Information and instructions are given to the CPU 101 from the keyboard 105 having operation keys via the CPU bus 104, and the keyboard 105 is connected to the mouse 106 which is a pointing device.

The bitmap image stored in the RAM 103 is selectively read by the CPU 101.
When reading a bitmap image from the RAM 103, the resolution of the bitmap image is converted according to the display state of the bitmap image. The bitmap image read from the RAM 103 is written in the frame memory 107 by the CPU 101 via the CPU bus 104, and the bitmap image written in the frame memory 107 is CRT1.
09 is supplied to the CRT 109 via the video bus 108. The CRT 109 displays the supplied bitmap image at the position designated by the CPU 101.

Next, the reading operation of the bitmap image from the RAM 103 and the writing operation of the read bitmap image to the frame memory 107 will be described with reference to the drawings. FIG. 2 is a diagram showing a bitmap image stored in the RAM of the computer system shown in FIG. 1 and a bitmap image after resolution conversion.

For example, as shown in FIG.
The bitmap images 201 and 203 stored in
It is a binary bitmap consisting of 2 pixels x 32 pixels,
White pixels represent "0" and black pixels represent "1". As shown in FIG. 2A, the bitmap image 201 is read while thinning out one pixel each in the vertical direction and the horizontal direction, and the image read while thinning out the pixels is read in the vertical direction and the horizontal direction. A bitmap image 202 is obtained by doubling each direction. That is, the resolution of the bitmap image 202 is half the resolution of the bitmap image 201. The bitmap image 202 whose resolution has been converted to 1/2 is the frame memory 1
It is written in 07.

Similarly, by reading out the bitmap image 203 while thinning out one pixel in each of the vertical direction and the horizontal direction, as shown in FIG. 2B, the resolution of the bitmap image 203 is halved. A bitmap image 204 having double the resolution is obtained. This bitmap image 204 is written in the frame memory 107.

Bitmap image 20 from RAM 103
In order to read 1, 203 and write resolution-converted bitmap images 202 and 204 into the frame memory 107, the number of accesses to the RAM 103 is 16 ×.
16 + 32 × 32 = 1280 accesses are required. On the other hand, unlike the conventional method, R is used without converting the resolution.
When writing the bitmap image 201 from the AM 103 to the frame memory 107, 32 × 32 × 2 = 204
Eight times access is required. Therefore, the resolution is 1/2
When doubled, the number of accesses required is about half of the conventional number of accesses, and as the number of accesses decreases, a high processing speed required for reading and writing is not required, and the processing speed related to display is increased. be able to.

Further, although the display image becomes difficult to see by halving the resolution, an image having a high resolution and the resolution of the image when the image is displayed while moving at high speed is displayed while moving at high speed. It is difficult to determine the difference from the image resolution in each case, and the display effect regarding the resolution in each display does not change significantly.

Next, the display operation of the bitmap image will be described with reference to the drawings. 3 is a diagram showing a screen display example of a bitmap image in the computer system of FIG. 1, FIG. 4 is a flowchart showing a display operation of the bitmap image in the computer system of FIG. 1, and FIG. 5 is a process of step S405 of FIG. It is a flowchart shown in detail.

, 1007 (shown in FIG. 10) stored in the RAM 103 are stored, and the bitmap images 1001, ..., 1007 are sequentially stored in the frame memory 107 at 1 second intervals. , ..., 1014.

When the bitmap images 1001, ..., 1007 stored in the RAM 103 are displayed while changing their positions, the following function is used to determine the display position of the bitmap image.

[0035]

X = f (t) (0 ≦ t ≦ te) (1)

[0036]

## EQU00002 ## y = g (t) (0.ltoreq.t.ltoreq.te) (2) In the above equations, x represents the position of the x coordinate, y represents the position of the y coordinate, and t represents the time. .

Referring to FIG. 4, first, the RAM 103,
Initialization such as clearing the frame memory 107, clearing the register, and setting parameters including the time parameter t is performed (step S401). In this embodiment, since the bitmap images 1001, ..., 1007 are displayed at 1 second intervals, when the time parameter t is set to “0” and te is set to “6” seconds, t = 0 seconds. The bitmap image 1001 is the bitmap image 1002 at t = 1 second.
However, at t = 2 seconds, the bitmap image 1003, at t = 3 seconds, the bitmap image 1004, at t = 4 seconds, the bitmap image 1005, and at t = 5 seconds, the bitmap image 1005.
6 is a bitmap image 1007 at t = 6 seconds (= te).
The correspondence relationship between the bitmap image and time is set so that

Next, the elapsed time t is calculated (step S402), and it is determined whether this time t has reached the time te (step S403). Time t is time t
When e has not elapsed, the bitmap image corresponding to the elapsed time t is selected (step S404). For example, when the elapsed time t is “0”, the bitmap image 1001 is selected.

After the bit map image corresponding to the elapsed time is selected, the bit map image selected from the RAM 103 is read while the resolution is converted, and this bit map image is transferred to the frame memory 107 (step S405). .

After the bit map image selected according to the elapsed time is transferred to the frame memory 107, the processing from step S402 is repeated until time te elapses. Bitmap images 1001 and 100 corresponding to time t = te
2,1003,1004,1005,1005,100
6, 1007 are sequentially transferred to the frame memory 107 every one second.

When the time t exceeds the time te, the processing ends.

Next, the above-mentioned step S405 will be described in detail with reference to FIG.

Referring to FIG. 5, first, parameters and the like are initialized (step S501).

After initialization, the display start position is calculated from time t (= 0) by the above equations (1) and (2) (step S
502), the image data stored in the frame memory 107 is erased (step S503).

Next, the read address for the one pixel data forming the bitmap image stored in the RAM 103 is calculated (step S504). After the read address is calculated, the 1-pixel data located at the read address is read, and the 1-pixel data is held in the register (step S505).

Next, the write address of the frame memory 107 is calculated (step S506), and the 1-pixel data held in the register is written to the calculated write address of the frame memory 107 (step S5).
07).

After writing the 1-pixel data to the frame memory 107, it is determined whether or not the number of times of writing the 1-pixel data has reached a predetermined number (step S508).

If the number of times of writing one pixel data has not reached the predetermined number, the processing from step S506 is executed again, and the same one pixel is written in another address position of the frame memory 107.

In this embodiment, a 16 × 16 bit map image is written into the frame memory 107 by writing the same 1 pixel at four positions in the frame memory 107.
Convert to a 2x32 bitmap image. The resolution of the bitmap image after conversion is 1/2 times the resolution of the bitmap image before conversion.

When the number of times of writing one pixel data reaches a predetermined number of times, it is determined whether or not all the bitmap map images 1001, ..., 1007 stored in the RAM 103 have been read (step S509). .

Bitmap map images 1001, ..., 1
When all 007 have not been read, step S is performed again.
The processing from 503 is repeated.

Bitmap map images 1001, ..., 1
When all 007 are read, the process ends.

The bitmap image written in the frame memory 107 is CR every time the next image data is written.
Transferred to T109 via video 108, CRT10
Each image data is sequentially displayed at 9 while changing its display position. For example, as shown in FIG. 3, each clock image is displayed on the screen 310 of the CRT 109 while changing its position, and the viewer feels as if each clock image 303,
, 309 appear to move along a locus 302 close to the ideal locus 301. Also, each clock image 303, ...,
309 has a resolution of bitmap image 1001. Although the resolution is lower than the resolution of 1003, the clock images 303, ..., 309 move on the screen 310 at high speed, so the viewer does not care about the low resolution.

As described above, by lowering the resolution of the display image, the number of images to be displayed can be increased without requiring a high writing ability and a high transfer ability for the image data moving with time. With that, the movement can be shown smoothly.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a flowchart showing the display operation of the bitmap image in the second embodiment of the image display device of the present invention.

The image display device of this embodiment has the same structure as the image display device of the first embodiment. In the first embodiment, the clock images 303, ..., 309 appear to move along the miracle 302, but when the last clock image 309 that has moved along the trajectory 302 continues to be displayed at that position, Since the resolution of the clock image 309 is low, it does not look good. On the other hand, in this embodiment, the resolution of the clock image 309 at the last display position is converted in order to prevent the last clock image 309 from being unsightly when it is continuously displayed at that position. Instead, a method of displaying a clock image having a high resolution before conversion is adopted.

The display operation of the bitmap image by this display method will be described with reference to FIG.

Referring to FIG. 6, first, the RAM 103,
Initialization such as clearing the frame memory 107, clearing registers, setting parameters including the time parameter t is performed (step S601). In this embodiment, since the bitmap images 1001, ..., 1007 are displayed at 1 second intervals, when the time parameter t is set to “0” and te is set to “6” seconds, t = 0 seconds. The bitmap image 1001 is the bitmap image 1002 at t = 1 second.
However, at t = 2 seconds, the bitmap image 1003, at t = 3 seconds, the bitmap image 1004, at t = 4 seconds, the bitmap image 1005, and at t = 5 seconds, the bitmap image 1005.
6 is a bitmap image 1007 at t = 6 seconds (= te).
The correspondence relationship between the bitmap image and time is set so that

Next, the elapsed time t is calculated (step S602), and it is determined whether this time t has reached the time te (step S603). Time t is time t
When e has not passed, the bitmap image corresponding to the elapsed time t is selected (step S604). For example, when the elapsed time t is “0”, the bitmap image 1001 is selected.

After selecting the bitmap image corresponding to the elapsed time, it is determined whether the selected bitmap image is the last bitmap image (step S60).
5).

When the selected bitmap image is not the last bitmap image, the selected bitmap image is read from the RAM 103 while its resolution is converted, and this bitmap image is transferred to the frame memory 107 ( Step S606).

After the bit map image selected according to the elapsed time is transferred to the frame memory 107, the process from step S402 is repeated until time te elapses, and by this repeating process, from time t = 0. Bitmap images 1001 and 100 corresponding to time t = te
2,1003,1004,1005,1005,100
6, 1007 are sequentially transferred to the frame memory 107 every one second.

When the selected bitmap image is the last bitmap image, the selected bitmap image 1007 is read from the RAM 103 without its resolution being converted, and this bitmap image 100 is read.
7 is transferred to the frame memory 107 (step S6)
07).

When the time t has passed the time te, the processing ends.

In each of the embodiments, the display has been described by taking a bit map image as an example, but the principle of the present invention can be applied to a byte map of a multivalued image, and the types of images are limited. There is no such thing.

[0066]

As described above, according to the image display device of the first aspect, a series of images are stored in the storage means, and the elapsed time is selected from the images stored in the storage means by the selection means. A predetermined image according to the selected image, the reading unit reads the selected image from the storage unit while converting the resolution, and the control unit displays the display position of the image on the display unit according to the elapsed time. Since the control is performed, it is possible to display the image so that the movement of the image is smooth, without requiring high writing ability and high transfer ability for the image moving with time.

According to the image display method of the second aspect, a series of images are stored in the storage means, and a predetermined image is selected from the images stored in the storage means according to the elapsed time,
An image selected from the storage means is read while converting its resolution, and the display position of the read image on the display means is controlled according to the elapsed time. Therefore, high writing ability for an image that moves with time and An image can be displayed so that its movement is smooth without requiring high transfer capability.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a computer system that constitutes a first embodiment of an image display device of the present invention.

FIG. 2 is a diagram showing a bitmap image stored in a RAM of the computer system shown in FIG. 1 and a bitmap image after resolution conversion.

3 is a diagram showing a screen display example of a bitmap image in the computer system of FIG.

4 is a flowchart showing a display operation of a bitmap image in the computer system of FIG.

FIG. 5 is a flowchart showing in detail the processing of step S405 of FIG.

FIG. 6 is a flowchart showing a display operation of a bitmap image in the second embodiment of the image display device of the present invention.

FIG. 7 is a block diagram showing a configuration of a conventional computer system having a function of continuously displaying images.

8 is a diagram showing a screen display example of a bitmap image in the computer system of FIG.

9 is a diagram for explaining an example of reading a bitmap image from a RAM to a frame memory in the computer system of FIG.

FIG. 10 is a RAM in the computer system of FIG.
FIG. 9 is a diagram for explaining another example of reading a bitmap image from a frame to a frame memory.

[Explanation of symbols]

 101 CPU 102 ROM 103 RAM 104 CPU Bus 107 Frame Memory 108 Video Bus 109 CRT

Claims (2)

[Claims] 1. An image display device for continuously displaying images on a display means, and storage means for storing a series of images,
Selecting means for selecting a predetermined image from the images stored in the storage means according to the elapsed time; reading means for reading out the selected image from the storage means while converting its resolution; An image display device comprising: a control unit that controls a display position of the output image on the display unit according to an elapsed time. 2. An image display method for continuously displaying an image on a display means, a step of storing a series of images in a storage means, and a predetermined one of the images stored in the storage means according to an elapsed time. Selecting the image, reading the selected image from the storage unit while converting the resolution, and controlling the display position of the read image on the display unit according to the elapsed time. An image display method comprising: