JPH06348253A - Moving picture display system - Google Patents

Abstract

PURPOSE:To decrease the quantity of processed data and the processing time by decreasing the rewriting frequency toward the peripheral part of a display area by paying attention to the human visual characteristics that the reaction to stimulation becomes dull with the distance from a gaze point. CONSTITUTION:This system consists of the display area 1 which is logically divided into (n) at the center part where the gaze point is present and in the corridor area surrounding it, area rewriting means 2-1, 2-2...2-n which rewrite data in a display memory corresponding to the divided areas (areas A1-An), and a rewriting indicating means 3 which monitors the system time and judges and indicates when and which area is rewritten. For the respective divided areas, rewriting intervals (T1-Tn) which are mutually different are so set that the rewriting frequency decreases from the center part to the peripheral part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving image display system,
In particular, it relates to a moving image display method when displaying a moving image by computer graphics.

[0002]

2. Description of the Related Art Conventionally, when a moving image is displayed on a display device by computer graphics, a process of generating image data of the entire display area in a main memory and transferring the generated image data to a display memory is repeated. The display memory was realized by rewriting the display memory at high speed within a unit time.

[0003]

However, in the above-described conventional moving image display system, the entire display area is rewritten by one rewriting, so that the load of generating and transferring the image data required for one rewriting is large. . Therefore, if rewriting is performed at high speed, the amount of image data processed by the central processing unit becomes enormous, and much of the processing time is spent on this data generation and transfer processing. This is
This is a problem when implementing moving image display with software.

The object of the present invention is to reduce the frequency of rewriting toward the peripheral part, paying attention to the fact that the reaction to the stimulus becomes slower as the distance from the gazing point is increased due to human visual characteristics. An object of the present invention is to provide a moving image display method capable of reducing the amount of processing data and the processing time of the central processing unit.

[0005]

According to a first aspect of the present invention, a display area is logically divided into a plurality of concentric areas according to a distance from a gazing point to a peripheral portion, and the display area is provided. It is characterized in that the data in the display memory for displaying the image is rewritten less frequently in the peripheral area.

According to a second aspect of the present invention, in the moving image display system, a display area logically divided into a plurality of areas concentrically by a rectangle similar to the outline of the outer shape and image data corresponding to the divided areas are generated. And a plurality of area rewriting means for transferring and updating to the corresponding address of the display memory for displaying an image in the display area, and a low frequency for monitoring the system time to the peripheral area with respect to each area rewriting means. And rewriting instruction means for repeatedly outputting the rewriting instruction information.

[0007]

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

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

In the moving image display system of this embodiment, as shown in FIG. 1, the display area 1 is logically divided into n areas corresponding to the distance from the central portion, which is the gazing point, to the peripheral portion.
And area rewriting means 2-1, 2-2, ... 2-n for rewriting the data in the display memory corresponding to each of the divided areas (area A1 to area An), and the system time (in the computer Rewriting instructing means 3 for monitoring and determining the area to be rewritten and instructing it.

Each divided area (area A1 to area An)
, Different rewriting intervals (T1 to Tn) are set. The rewriting interval (T1 to Tn) is inversely proportional to the rewriting frequency, and its unit is time (for example, 30 ms). The rewriting interval of the area A1 in the central portion is approximately the same as in the conventional case, but the rewriting interval is set to increase from the central portion to the peripheral portion.

FIG. 2 is a flow chart showing the operation of the rewriting instruction means 3.

In step S1, it is judged whether or not the rewriting elapsed time of the area A1 (difference between the system time and the time when the area A1 was last rewritten) has reached the rewriting interval T1 of the area A1. If so, the process proceeds to step S2, and if not reached, the process proceeds to step S3.

In step S2, the rewriting instruction information is output to the area rewriting means 2-1 that rewrites the area A1 and the area rewriting means 2-1 is activated, and the process proceeds to step S2.

In step S3, similarly to step S1, it is determined whether the rewriting elapsed time of the area A2 has reached the rewriting interval T2, and if it has reached, after activating the area rewriting means 2-2 in step S4, If not, the process immediately proceeds to the step for the next area A3.

Similar processing is performed in step S for the area An.
5. After performing step S6, the process returns to step S1 and the above-described processing is repeated.

FIG. 3 shows area rewriting means 2-i (i =
It is a flowchart which shows operation | movement of 1, 2, ...

In step S7, image data for each area Ai to be processed is generated, and in step S8.
Then, the image data generated in step S7 is transferred to the address corresponding to the area Ai on the display memory and updated.

The rewriting instruction means 3 and the area rewriting means 2-i are started by separate tasks (when one program is divided and each of them is allowed to operate in parallel, a part of the divided program is called a task). Then, a maximum of n area rewriting means 2-i are simultaneously activated.

As described above, by setting the rewriting interval of the divided areas in the peripheral portion to be larger than that in the conventional case, the frequency of rewriting in the peripheral portion is reduced, the processing amount of image data is reduced in the entire system, and the processing of the central processing unit is reduced. Time savings are expected. On the other hand, since the visual characteristics of human beings are far from the gazing point and thus the reaction to the stimulus becomes slow, the characteristics of the moving image perceived through the eyes are hardly deteriorated.

In the above-described embodiment, the display area is divided into rectangles similar to the contour, and the central portion and the divided corridor-like areas are shared by different area rewriting means, and the rewriting intervals are free regardless of each other. It has been explained that it can be set to and operates asynchronously. On the other hand, a method in which the shared area of each area rewriting means is not a corridor shape but a rectangular area including the entire inner area and each area rewriting means is operated in synchronization, and the rewriting frequency is halved as the area expands is also possible. Conceivable.

Although the gazing point is the center of the display area and the display area is divided into rectangles, the gazing point is not limited to the center as long as it is within the display area, and the gazing point is not limited to the center and has a shape other than a rectangle. You may divide concentrically.

Further, in the above embodiment, the rewriting instruction means monitors the system time and outputs the rewriting instruction of each area asynchronously. However, the rewriting interval of each area is set to be an integer ratio, You may control synchronously using a counter etc.

[0023]

As described above, according to the moving image display method of the present invention, the display area of a moving image is logically divided to reduce the frequency of rewriting of the peripheral area, and the central processing unit This has the effect of reducing the amount of data to be processed and the processing time.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of a rewriting instruction means in FIG.

FIG. 3 is a flowchart illustrating an operation of a region rewriting unit shown in FIG.

[Explanation of symbols]

 1 display area 2-1, 2-2, 2-n area rewriting means 3 rewriting instruction means

Claims (2)

[Claims] 1. A display area is logically divided into a plurality of concentric areas according to a distance from a gazing point toward a peripheral portion, and data in a display memory for displaying an image in the display area is surrounded. A moving image display method characterized in that rewriting is performed less frequently in the area of a copy. 2. A display area logically divided into a plurality of areas concentrically with a rectangle similar to the outline of the outer shape, and image data corresponding to each of the divided areas is generated to display an image on the display area. A plurality of area rewriting means for transferring and updating to the corresponding addresses of the display memory for displaying, and rewriting instruction information is repeatedly output to the area rewriting means at a low frequency to the area rewriting means in the peripheral portion. A moving image display method comprising rewriting instruction means.