JP2753010B2 - Moving image display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a moving image display method for displaying a moving image created by image processing or the like on a non-interlaced display device, and enables display of moving image information regardless of the scanning frequency of the display device. For this purpose, a pair of memory means to which moving image information is supplied, and a write and read operation of each memory means are alternately performed so that one of the pair of memory means performs a write operation while the other performs a read operation. A display mode of each frame of the moving image information in a moving image display system comprising a control unit for controlling the moving image information and a non-interlaced display unit for displaying the moving image information read from the memory unit during the reading operation. Storage means for storing the number of times of display according to, the vertical synchronization signal indicating the display timing of the display means is counted,
A counting means for determining a timing for switching between a memory means for performing a read operation and a memory means for performing a write operation by outputting a control signal to the control means when the number of times of display matches the number of displays specified by the storage means; Configure.

[Industrial applications]

The present invention relates to a moving image display method, particularly to a moving image display method for displaying a moving image created by image processing or the like on a non-interlaced display device.

In recent years, with the progress of memory devices, memory devices having a large storage capacity have become relatively inexpensive, and it has become possible to store, for example, information on moving images for several seconds in the memory device.

[Conventional technology]

For example, even if one cut scene such as an animation is several seconds, if a memory device having a large storage capacity is used, information on the one cut scene is temporarily stored in the memory device and then read out to be read by a video tape recorder (VTR) or the like. It can be recorded on video equipment. In such a case, 1
Even if the image of each frame (frame) in the cut scene is normal, the motion of the moving image may become unnatural when the frames in one cut scene are continuously displayed. For this reason, there is a demand that the moving image information stored in the memory device be displayed on a display device and confirmed for the moving image to be recorded before being recorded by a video device.

In order to display a moving image on a display device, an operation of using a pair of memory devices to write moving image information to one memory device and displaying moving image information read from the other memory device on the display device is performed. May be alternately used as a pair of memory devices as a write-side memory device and a read-side memory device. Switching between the write-side memory device and the read-side memory device is performed during the display blanking period of the display device. Therefore, for example, in the case of a non-interlace display device having a scanning frequency of 30 Hz (that is, 30 frames / second), if the moving image information stored in the memory device is 30 frames / second like a television image, Real-time display can be performed by displaying frames.

However, if the moving image information is 24 frames / second like a movie film, a display device having a scanning frequency of 30 Hz cannot perform real-time display. That is, when each frame is displayed, the display time is shorter than the actual time.

[Problems to be solved by the invention]

Therefore, conventionally, there has been a problem that moving image information that can be displayed is determined by the scanning frequency of the display device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a moving image information display method capable of displaying moving image information regardless of a scanning frequency of a display device.

[Means for solving the problem]

FIG. 1 is a diagram illustrating the principle of the present invention. In the figure, 1,2
Is a pair of memory means to which moving image information is supplied, and 3 alternately performs a write operation and a read operation of each memory means so that one of the pair of memory means 1 and 2 performs a write operation while the other performs a read operation. Control means 4 for controlling, non-interlaced display means 4 for displaying moving picture information read from the memory means during the reading operation, 5 storage means, and 6 a counting means.

[Action]

The storage means 5 stores the number of times of display according to the display mode of each frame of the moving image information, and the counting means 6 counts a vertical synchronization signal indicating the display timing of the display means 4 and stores it.
When the number of times of display matches the number of times of display, the control signal is output to the control means to determine the timing of switching between the memory means for performing the read operation and the memory means for performing the write operation.

Therefore, moving image information can be displayed in any display mode regardless of the scanning frequency of the display device.

〔Example〕

FIG. 2 shows an embodiment of the present invention. In the figure, 11 is a synchronization signal generator, 12 is a digital / analog (D / A) converter, 13 is a non-interlaced display device such as a CRT, 1
4 is a display number control table, 15 is a moving image control circuit, 16 is a down counter, 17 is a read control unit, 18 and 19 are first and second memories, respectively, 20 is a large capacity memory, 21 is a write control unit, 22 is a central control unit (CPU).

The synchronization signal generator 11 generates a vertical synchronization signal and a horizontal synchronization signal for controlling the display operation timing of the display device 13, and generates a synchronization signal for controlling the operation timing of the D / A converter 12. The moving image control circuit 15 includes the synchronization signal generator 11
By controlling the read control unit 17 and the write control unit 21 based on the synchronization signal from the CPU, the moving image information read from the memory 18 (or 19) selected as the read side by the read control unit 17 is stored in the D / The moving image information supplied to the display device via the A converter 12 and stored in the large-capacity memory 20 is sequentially written to the memory 19 (or 18) selected as the writing side by the writing control unit 21.

When the write data is supplied from the CPU 22, the display count control table 14 stores, for example, the display counts shown in FIG. 3 for the first to n-th frames of the moving image information. The number of display times is determined by the CPU 22
By specifying an address via 5, the data is read from the display count control table 14 and is preset as preset data in the down counter 16 in response to a preset signal from the moving image control circuit 15. The down counter 16
Count down the number of vertical synchronization signals from the preset display count. When the countdown for the preset number of displays is completed, a carry signal is output, and the moving image control circuit 15 clears the down counter 16 by outputting a clear signal in response to the carry signal.
In addition, the moving image control circuit 15 outputs a control signal to the read control unit 17 and the write control unit 21 in response to the carry signal, so that the memory 18 (or 19) which has been selected as the read side until then is written to the write side. Switch to memory 19 and the memory 19 (or 1
8) Switch to the reading side and select. As a result, the display shifts to the next frame display operation.

Therefore, in this embodiment, the first frame is displayed twice, the second frame is displayed three times, the third frame is displayed five times, and so on in accordance with the number of times of display shown in FIG. The frame is displayed twice. Accordingly, by creating the display number control table 14 in consideration of the scanning frequency of the display device, it is possible to display moving image information in any display mode including a variable speed playback mode such as slow motion or quick motion. it can.

Since the memory selected as the reading side and the memory selected as the writing side are always different memories,
While reading and displaying moving image information from one memory, moving image information on one frame to be displayed next can be written to the other memory to prepare for the next display. If the writing operation is not completed during the display time of one frame due to the data transfer speed of the large-capacity memory 20 or the like, for example, the reading side and the writing side respond in response to the vertical synchronization signal after the completion of the writing operation. By changing the memory, the disturbance of the displayed image can be prevented.

FIG. 4A shows a case where the moving image information stored in the large-capacity memory 20 is 30 frames / second like a television image and the scanning frequency of the display device 13 is 60 frames / second (Hz). The display count stored in the display count control table 14 for real-time display is shown. In this case, each frame is displayed twice.

FIG. 4 (b) shows that the moving image information stored in the large-capacity memory 20 is 20 frames / sec and the scanning frequency of the display device 13 is
Shows the number of times of display stored in the number-of-displays control table 14 for real-time display at 60 Hz. In this case, each frame is displayed three times.

FIG. 4 (c) is for real time display when the moving picture information stored in the large capacity memory 20 is 24 frames / sec like a movie film and the scanning frequency of the display device 13 is 60 Hz. Shows the number of display times stored in the display number control table 14. In this case, the display count of the frame is "2",
Two times and three times are alternately displayed like "3", "2", "3",.

FIG. 5 shows the operation timing of the embodiment when the number of display times shown in FIG. 4 (c) is stored in the display number control table 14. In FIG. 5, V.SYNC is a vertical synchronization signal, COUNT is a count value of the down counter 16, READ is a memory on the read side, WRITE is a memory on the write side, and WAIT is a signal indicating the end of writing. Indicates that the memory 18 has been selected and "B" indicates that the memory 19 has been selected. Switching between the read-side memory and the write-side memory needs to be performed on the condition that writing of one frame of moving image information by the write-side memory has been completed. Therefore, when the writing-side memory has completed writing one frame of moving image information, the moving image control circuit 15 outputs a signal WAIT to the writing control unit 21 to complete the reading operation of one frame by the reading-side memory. Until the switching of the memory is performed, the writing side memory prevents writing of moving image information for the next frame.

In the above embodiment, the moving image information supplied to the memories 18 and 19 is obtained from the large-capacity memory 20, but the source of the moving image information is not limited to this.

Although the present invention has been described with reference to the embodiments, the present invention can be variously modified in accordance with the gist of the present invention, and these are not excluded from the present invention.

〔The invention's effect〕

According to the present invention, the number of display times of each frame of the moving image information can be set according to the display mode. Therefore, the moving image information can be displayed regardless of the scanning frequency of the display device. is there.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the principle of the present invention, FIG. 2 is a block diagram showing one embodiment of the present invention, FIGS. 3 and 4 are diagrams showing the number of display times stored in a display number control table. FIG. 5 is a timing chart for explaining the operation of the embodiment. 1 to 5, 1 and 2 are memory means, 3 is control means, 4 is display means, 5 is storage means, 6 is counting means, 11 is a synchronization signal generator, and 12 is a D / A converter. , 13 is a display device, 14 is a display count control table, 15 is a moving image control circuit, 16 is a down counter, 17 is a read control unit, 18, 19 is a memory, 20 is a large capacity memory, 21, a write control unit, 22 Indicates a CPU.

Claims (1)

(57) [Claims] 1. A pair of memory means (1 and 2) to which moving picture information is supplied, and a write operation of each memory means such that one of the pair of memory means performs a write operation while the other performs a read operation. And a non-interlaced display means (4) for displaying moving picture information read from the memory means during the reading operation. A storage means (5) for storing the number of display times corresponding to the display mode of each frame of the moving image information; and a vertical synchronization signal indicating a display timing of the display means (4) counted and designated by the storage means. A timing for switching between the memory means for performing the read operation and the memory means for performing the write operation by outputting a control signal to the control means (3) when the number of times of display matches the displayed number of times. Moving image display method characterized by having a determining counting means (6).