JP2022066505A - Program, image processing method and image processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further smoothly display an object.

SOLUTION: An image processing device is provided with a program for executing the steps of: with respect to a first object which is a first threshold or more distant from a predetermined position on a virtual three-dimensional space, reading first data indicating a value of a pixel of first resolution into a memory from a predetermined recording medium; if the distance of the first object is less than the first threshold, reading second data indicating a value of a pixel not included in the first data, among values of pixels of second resolution including at least a part of the pixels of the first resolution, into the memory from the predetermined recording medium; generating an image of the second resolution on the basis of the first data and the second data; and displaying the first object on a screen by using the generated image of the second resolution.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a program, an image processing method, and an image processing apparatus.

Conventionally, in computer games, simulations, and the like, there is known a technique of displaying an object such as a character operated by a user (player) so that it can be moved in a virtual three-dimensional space by using three-dimensional computer graphics.

In this technique, texture images with different resolutions are prepared in advance for one object, and the object is operated according to the distance from the position of the character operated by the user in the virtual three-dimensional space. There is known a technique for switching the resolution of a texture image or the like used for displaying (see, for example, Patent Documents 1 to 3).

Japanese Unexamined Patent Publication No. 2016-202716 Japanese Patent No. 5292146 Japanese Patent No. 4502678

However, in the prior art, when the number of objects to be displayed is relatively large, it takes time to read the image into the memory. Therefore, when the position of the user's viewpoint changes relatively suddenly, there is a problem that it may take time for an object that is closer to the position to be displayed at a resolution corresponding to the distance. be.

Therefore, on one aspect, it is an object of the present invention to provide a technique for displaying an object more smoothly.

In one proposal, the image processing device is provided with first data indicating the value of the pixel of the first resolution for the first object whose distance from a predetermined position in the virtual three-dimensional space is equal to or greater than the first threshold value. And a second resolution including at least a portion of the first resolution pixel when the distance of the first object is less than the first threshold. A step of reading a second data indicating a pixel value not included in the first data among the pixel values from the predetermined recording medium into the memory, the first data, and the second data. Provided is a program that executes a step of generating an image of the second resolution based on data and a step of displaying the first object on a screen using the generated image of the second resolution. Will be done.

According to one aspect, the display of the object can be performed more smoothly.

It is a figure which shows the hardware configuration example of the image processing apparatus which concerns on embodiment. It is a functional block diagram of the image processing apparatus which concerns on embodiment. It is a flowchart which shows an example of the processing of an image processing apparatus. It is a figure explaining the resolution of the texture image used according to the distance from a reference position. It is a figure explaining the resolution of the texture image used according to the distance from a reference position. It is a figure explaining an example of the data for a texture image according to the distance from a reference position. It is a figure explaining an example of the data for a texture image according to the distance from a reference position. It is a figure explaining the display screen example of the virtual 3D space. It is a figure explaining the display screen example of the virtual 3D space.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Hardware configuration>
FIG. 1 is a diagram showing a hardware configuration example of the image processing apparatus 10 according to the embodiment. The image processing device 10 shown in FIG. 1 has a drive device 100, an auxiliary storage device 102, a memory device 103, a CPU 104, an interface device 105, a display device 106, an input device 107, and the like, which are connected to each other by a bus B, respectively. ..

The game program that realizes the processing in the image processing apparatus 10 is provided by the recording medium 101. When the recording medium 101 on which the game program is recorded is set in the drive device 100, the game program is installed in the auxiliary storage device 102 from the recording medium 101 via the drive device 100. However, the game program does not necessarily have to be installed from the recording medium 101, and may be downloaded from another computer via the network. The auxiliary storage device 102 stores the installed game program and also stores necessary files, data, and the like.

The memory device 103 is, for example, a memory such as a DRAM (Dynamic Random Access Memory) or a SRAM (Static Random Access Memory), and reads and stores a program from the auxiliary storage device 102 when a program start instruction is given. .. The CPU 104 realizes the function related to the image processing device 10 according to the program stored in the memory device 103. The interface device 105 is used as an interface for connecting to a network. The display device 106 displays a GUI (Graphical User Interface) or the like by a program. The input device 107 is composed of a controller, a keyboard, a mouse, etc., a touch panel, buttons, and the like, and is used for inputting various operation instructions.

An example of the recording medium 101 is a portable recording medium such as a CD-ROM, a DVD disc, a Blu-ray disc, or a USB memory. Further, as an example of the auxiliary storage device 102, an HDD (Hard Disk Drive), an SSD (Solid State Drive), a flash memory, or the like can be mentioned. Both the recording medium 101 and the auxiliary storage device 102 correspond to computer-readable recording media.

<Functional configuration>
Next, with reference to FIG. 2, the functional configuration of the image processing apparatus 10 will be described. FIG. 2 is a functional block diagram of the image processing apparatus 10 according to the embodiment.

The image processing device 10 has a storage unit 11. The storage unit 11 is realized by using, for example, an auxiliary storage device 102 or the like. The storage unit 11 stores three-dimensional data 111 and the like. The three-dimensional data 111 is data of a three-dimensional model of each object, and is data including data of a model of each object, data of a texture image, and the like.

Further, the image processing device 10 has a reception unit 12, a control unit 13, a generation unit 14, and a display control unit 15. Each of these parts is realized by a process in which one or more programs installed in the image processing device 10 are executed by the CPU 104 of the image processing device 10.

The reception unit 12 receives operations such as moving the player character on the virtual three-dimensional space from the user.

The control unit 13 controls the progress of the game and the like. Further, the control unit 13 responds to an operation or the like received by the reception unit 12, and has a pixel value with a relatively low resolution for an object whose distance from a predetermined position on the virtual three-dimensional space is equal to or greater than a predetermined threshold value. The first data indicating the above is read from the recording medium 101 or the auxiliary storage device 102 into the memory device 103. Here, the predetermined position (hereinafter, also referred to as "reference position") is, for example, the position of the player character in the virtual three-dimensional space or the viewpoint of the user in the virtual three-dimensional space (virtual camera, virtual camera). ) Position. The control unit 13 displays the virtual three-dimensional space captured by the virtual camera on the screen by three-dimensional computer graphics.

The position of the virtual camera is, for example, a position on a spherical surface separated from the center position of the player character by a predetermined distance in the virtual three-dimensional space, and may be moved on the spherical surface by the user's operation. Further, the predetermined distance may be changed by the operation of the user.

Further, when the distance from a predetermined position on the virtual three-dimensional space to the object becomes a predetermined threshold in response to an operation or the like received by the reception unit 12, the control unit 13 has a relatively low resolution. Of the values of pixels having a relatively high resolution including at least a part of the pixels, the second data indicating the values of the pixels not included in the first data is stored in the recording medium 101 or the auxiliary storage device 102 to the memory device 103. Read into.

The generation unit 14 is based on the relatively low resolution data stored in the memory device 103 and the difference data for relatively high resolution read from the recording medium such as the auxiliary storage device 102 by the control unit 13. , Produces relatively high resolution images. Further, the generation unit 14 generates an image having a relatively low resolution based on the data having a relatively high resolution stored in the memory device 103.

The display control unit 15 displays the image in the game on the screen using the image data generated by the generation unit 14 according to the instruction from the control unit 13.

<Processing>
Next, the processing of the image processing apparatus 10 will be described with reference to FIGS. 3 to 6B. FIG. 3 is a flowchart showing an example of processing of the image processing apparatus 10. 4A and 4B are diagrams illustrating the resolution of the texture image used according to the distance from the reference position. 5A and 5B are diagrams illustrating an example of data for a texture image according to a distance from a reference position. 6A and 6B are diagrams illustrating an example of a display screen in a virtual three-dimensional space.

In the following, an open world (sandbox, free roaming) game will be described as an example. In an open world game, three-dimensional data such as terrain, buildings, and vegetation around the player character are read and displayed according to the movement of the player character operated by the user. As a result, the user can move the player character seamlessly in a relatively vast world on a virtual three-dimensional space without switching maps.

In step S1, when the game is started by the user's operation or the like, the control unit 13 reads the game data including the three-dimensional data 111 and the like from the auxiliary storage device 102 or the recording medium 101, and reads the read data and the read data. The texture image generated by the generation unit 14 from the data is stored in the memory device 103.

Here, for the read data, the generation unit 14 generates a texture image having a resolution (number of pixels) corresponding to the distance from the reference position to the position of each object for each object in the virtual three-dimensional space. Contains data. In addition, each object in the virtual three-dimensional space includes, for example, a terrain, a building, a plant, a character, and the like.

Here, for example, an object such as a building or a tree located far from the position of a player character or the like has a relatively small pixel size displayed on the screen. Therefore, when texture mapping is performed on the object using a texture image whose resolution is higher than a certain level of the pixels displayed on the screen, the ratio of the data contained in the texture image that is not used for texture mapping is high. It will be relatively high. Therefore, in the present embodiment, by using the texture images having the resolutions as shown in FIGS. 4A and 4B, the ratio of the data not used for the texture mapping is reduced.

As shown in FIGS. 4A and 4B, the control unit 13 increases the distance from the reference position to the position of the object in the virtual three-dimensional space as the distance decreases (the player character or the like approaches the object). Use a higher resolution texture image to perform texture mapping to the 3D model of the object.

In the examples of FIGS. 4A and 4B, five levels of resolution are defined as follows according to the distance from the reference position to the position of the object. The resolution stage is not limited to 5.

(1) As shown in FIG. 4A, the resolution 421 of N × N pixels (an example of the “first resolution”) is defined for the object 411 whose distance from the reference position 400 is the first threshold value 401 or more. Has been done. Here, N may be, for example, 64 or the like.

(2) As shown in FIG. 4A, 2N for an object 412 whose distance from the reference position 400 is equal to or greater than the second threshold value 402, which is smaller than the first threshold value 401, and is less than the first threshold value 401. A resolution 422 of × 2N pixels (an example of a “second resolution”) is specified.

(3) As shown in FIG. 4B, 4N with respect to the object 413 whose distance from the reference position 400 is equal to or greater than the third threshold value 403, which is smaller than the second threshold value 402, and is less than the second threshold value 402. A resolution 423 of × 4N pixels (an example of a “third resolution”) is specified. Note that FIG. 4B is an enlargement of the range in which the distance from the reference position 400 in FIG. 4A is smaller than the second threshold value 402.

(4) As shown in FIG. 4B, 8N for an object 414 whose distance from the reference position 400 is equal to or greater than the fourth threshold value 404 smaller than the third threshold value 403 and less than the third threshold value 403. A resolution of 424 of × 8N pixels is specified.

(5) As shown in FIG. 4B, a resolution 425 of 16N × 16N pixels is defined for an object 415 whose distance from the reference position 400 is less than the fourth threshold value 404.

The value of the first threshold value 401, the value of the second threshold value 402, the value of the third threshold value 403, and the value of the fourth threshold value 404 are 16 times and 8 times the value of the fifth threshold value 405, respectively. It may be quadrupled or doubled.

Further, in the present embodiment, as shown in FIG. 5A, the auxiliary storage device 102 or the recording medium 101 is associated with the ID of each object in the virtual three-dimensional space and includes the following data in the three-dimensional data 111. Is recorded in advance.

(1) An example of first data 501 (“first data”” representing a texture image having a resolution of 421 of N × N pixels used for an object 411 having a distance from a reference position 400 of a first threshold value of 401 or more. ).

(2) A resolution 422 of 2N × 2N pixels used for an object 412 whose distance from the reference position 400 is equal to or greater than the second threshold value 402, which is smaller than the first threshold value 401, and is less than the first threshold value 401. Second data 502 of 2N × 2N—N × N pixels of the portion of the texture image not included in the first data 501 (an example of “second data”).

(3) Resolution 423 of 4N × 4N pixels used for an object 413 whose distance from the reference position 400 is equal to or greater than the third threshold value 403, which is smaller than the second threshold value 402, and is less than the second threshold value 402. 3rd data 503 of 4N × 4N-2N × 2N—N × N pixels of the portion not included in the first data 501 and the second data 502 (an example of “third data”). ..

(4) Resolution 424 of 8N × 8N pixels used for an object 414 whose distance from the reference position 400 is greater than or equal to the fourth threshold value 404, which is smaller than the third threshold value 403, and less than the third threshold value 403. The fourth data 504 of 8N × 8N-4N × 4N-2N × 2N—N × N pixels of the portion not included in the first data 501, the second data 502, and the third data 503 in the texture image of.

(5) Of the 16N × 16N pixel resolution 425 texture images used for the object 415 whose distance from the reference position 400 is less than the fourth threshold value 404, the first data 501, the second data 502, and the third. The fifth data 505 of 16N × 16N-8N × 8N-4N × 4N-2N × 2N—N × N pixels of the portion not included in the data 503 and the fourth data 504.

As shown by ◯ in FIG. 5B, for example, the first data 501 is data having a pixel interval of 16N-1 in a texture image having a pixel resolution of 16N × 16N.

Further, as shown by ● in FIG. 5B, the second data 502 is not included in the first data 501 among the data of the pixels having a pixel interval of 8N-1 in the texture image having a pixel resolution of 16N × 16N. It is pixel data.

Further, as shown by Δ in FIG. 5B, the third data 503 is the first data 501 and the second data 501 among the data of the pixels having a 4N-1 pixel interval in the texture image having a pixel resolution of 16N × 16N. It is the data of the pixel not included in the data 502.

Further, as shown by ▲ in FIG. 5B, the fourth data 504 is the first data 501 to the third data among the data of the pixels having a 2N-1 pixel interval in the texture image having a pixel resolution of 16N × 16N. It is the data of the pixel not included in 503.

Further, as shown by □ in FIG. 5B, the fifth data 505 includes pixels whose 16N × 16N is not included in the first data 501 to the fourth data 504 among the pixel data in the texture image having the pixel resolution 425. It is data.

The following (1) to (5) generated by the generation unit 14 according to the distance from the reference position to the position of each object in the virtual three-dimensional space by the process of step S1 described above. Any one of the texture images is stored in the memory device 103.
(1) A texture image having a resolution of 421 generated based only on the first data 501.
(2) A texture image having a resolution of 422 generated based on the first data 501 and the second data 502.
(3) A texture image having a resolution of 423 generated based on the first data 501 to the third data 503.
(4) A texture image having a resolution of 424 generated based on the first data 501 to the fourth data 504.
(5) A texture image having a resolution of 425 generated based on the first data 501 to the fifth data 505.

Subsequently, the control unit 13 causes the display control unit 15 to display each object on the virtual three-dimensional space on the screen by using the data stored in the memory device 103 by the three-dimensional computer graphics (step S2). Here, the display control unit 15 displays the images as shown in FIGS. 6A and 6B. In the example of FIG. 6A, a tree object 601 located relatively close to the tree, a tree object 602 located relatively far away, and the like are displayed. In the example of FIG. 6B, a tree object 611 located relatively close to the tree, a tree object 612 located relatively far away, and the like are displayed.

Here, the control unit 13 uses the first data 501 to the fifth data 505 of the data associated with each object for the object 601 and the object 611, respectively, and has a resolution of 16N × 16N pixels. A texture image is generated and displayed using the generated texture image. Further, for the object 602 and the object 612, the control unit 13 generates a texture image having a resolution of 8N × 8N pixels by using the first data 501 to the fourth data 504, respectively, and uses the generated texture image. Is displayed.

The control unit 13 executes texture mapping using, for example, a display control unit 15 realized by an API (Application Programming Interface) provided by a program such as an OS (Operating System) of the image processing device 10. May be good. For example, when data of a texture image and a three-dimensional model of an object are input to the API, a program such as an OS may perform texture mapping according to the size of the pixel on which the object is displayed on the screen.

Subsequently, the reception unit 12 receives an operation for moving the player character from the user (step S3).

Subsequently, the control unit 13 moves the player character on the virtual three-dimensional space in response to the user's operation (step S4).

Subsequently, the control unit 13 determines each object displayed on the screen among the objects on the virtual three-dimensional space (step S5). Note that the control unit 13 refers to, for example, an object at a position hidden behind other objects and invisible to the user's viewpoint in the virtual three-dimensional space, and an object at a position not within the user's field of view. , It is not necessary to execute the following processing.

Subsequently, the control unit 13 causes the display control unit 15 to display each object displayed on the screen on the screen by using the texture image stored in the memory device 103 (step S6). As a result, for example, even when the player character suddenly moves a relatively long distance, the first data 501 representing the lowest resolution texture image read at the time of starting the game in step S1 and stored in the memory device 103. Each object is displayed using. Therefore, even if the user uses a function that allows the player character to move instantly to a city that has been visited before, for example, the image quality is lower than the image quality at the resolution specified according to the distance. , Each object can be displayed instantly.

Subsequently, the control unit 13 selects one of the objects displayed on the screen as the object to be processed (step S7). Hereinafter, any one object among the objects displayed on the screen will be referred to as an "object to be processed". Therefore, the following processing is executed for each object displayed on the screen.

Subsequently, the control unit 13 calculates the distance on the virtual three-dimensional space from the above-mentioned reference position to the position of the object to be processed (step S8).

Subsequently, the control unit 13 currently stores the resolution defined according to the calculated distance (hereinafter referred to as "resolution according to the distance") in the memory device 103 for the object to be processed. It is determined whether or not the resolution is the same as the current resolution (hereinafter referred to as “current resolution”) (step S9).

When the resolution according to the distance and the current resolution are the same (YES in step S9), the process proceeds to step S16 described later.

When the resolution according to the distance and the current resolution are not the same (NO in step S9), the control unit 13 determines whether or not the resolution according to the distance is higher than the current resolution (step S10).

When the resolution according to the distance is higher than the current resolution (YES in step S10), the control unit 13 currently stores the texture image having the resolution according to the distance for the object to be processed in the memory device 103. Only the image data (difference data) of the unfinished portion is read from the auxiliary storage device 102 or the recording medium 101 (step S11).

Subsequently, the control unit 13 causes the generation unit 14 to generate a texture image having a resolution corresponding to the distance for the object to be processed based on the read difference data and the data stored in the memory device 103. Store in the memory device 103 (step S12).

Subsequently, the control unit 13 updates the display of the object to be processed by the display control unit 15 using the texture image stored in the memory device 103 (step S13), and proceeds to the process of step S16 described later.

On the other hand, when the resolution according to the distance is not higher than the current resolution (NO in step S10), the control unit 13 is a texture image of the object to be processed stored in the memory device 103 (hereinafter, "original image"). Based on (referred to as "data"), a texture image having a resolution corresponding to the distance is generated by the generation unit 14 and stored in the memory device 103 (step S14).

Subsequently, the control unit 13 erases the original image data from the memory device 103 (step S15).

Subsequently, the control unit 13 determines whether or not there is an unprocessed object that has not been selected as the object to be processed among the objects displayed on the screen (step S16).

If there is an unprocessed object (YES in step S16), the unprocessed object is selected as the object to be processed (step S17), and the process proceeds to step S8.

When there is no unprocessed object (NO in step S16), the control unit 13 determines whether or not to end the game by the user's operation or the like (step S18). If the game is not finished (NO in step S18), the process proceeds to step S3. When ending the game (YES in step S18), the process ends.

<Modification example>
When the control unit 13 generates a texture image having a resolution corresponding to the distance in step S15, instead of erasing the original image data from the memory device 103, when the free space of the memory device 103 becomes equal to or less than a predetermined threshold value. In addition, the original image data may be erased from the memory device 103. Then, when the original image data remains in the memory device 103, the control unit 13 reads the data from the auxiliary storage device 102 or the recording medium 101 in steps S11 to S12 and obtains a texture image having a resolution corresponding to the distance. Instead of generating, the original image data may be reused. This makes it possible to display the object more smoothly.

In this case, the control unit 13 stores, for example, the original image data in association with the time when the original image data was last used for display (hereinafter referred to as "last used time"). .. Then, when the free space of the memory device 103 becomes equal to or less than a predetermined threshold value, the control unit 13 may delete the original image data having the oldest last use time from the memory device 103. In this case, for example, the resolution 422 of 2N × 2N pixels, the resolution 423 of 4N × 4N pixels, the resolution 424 of 8N × 8N pixels, and the resolution 425 of 16N × 16N pixels can be recorded in the memory device 103. The upper limit of the number of images is set in the control unit 13 in advance. Then, when the number of images recorded for one resolution exceeds the upper limit set for the one resolution, the control unit 13 has the image group of the one resolution for a plurality of objects. Among them, the image data having the oldest last use time is erased from the memory device 103.

<Effect>
In an open world game in which the player character can freely move around the world in a vast virtual three-dimensional space, it is possible to express a large-scale image when viewing the scenery of the area from a high position. In this case, it is preferable to display not only objects such as surrounding buildings and trees but also objects located far away as much as possible from the viewpoint of realism.

Therefore, in an open world game, the amount of data such as objects that should be read in memory, the display of objects, etc., compared to a game that is not an open world that switches to another space when it reaches the edge of each space. The processing load is large.

On the other hand, depending on the performance of the hardware of the game device, there is an upper limit to the calculation speed of the memory size, the CPU, and the like. Therefore, in the prior art, it is necessary to reduce the number of objects to be displayed in 3D computer graphics, which has a relatively high processing load due to the large number of objects to be displayed, for example, in open world games. Become.

On the other hand, according to the above-described embodiment, for an object whose distance from a predetermined position on a virtual three-dimensional space is equal to or greater than a threshold value, first data indicating a pixel value of the first resolution is stored in a predetermined recording medium. Read from to memory. When the distance to the first object is less than the threshold value, it is not included in the first data among the values of the pixels of the second resolution including at least a part of the pixels of the first resolution. The second data indicating the pixel value is read into the memory. Then, an image having a second resolution is generated based on the first data and the second data, and the first object is displayed on the screen using the generated image having the second resolution.

That is, according to the above-described embodiment, when the distance to the object is approached, the difference between the data of the image of the second resolution and the first data already read in the memory for the object is used. Only certain second data is additionally read into memory. The speed at which the CPU 104 reads data from a recording medium such as an auxiliary storage device 102 such as an HDD and a recording medium 101 such as a Blu-ray disc is considerably slower than the speed at which the CPU 104 reads data from a memory. Therefore, according to the above-described embodiment, the display of the object is displayed as compared with the process of reading the entire data of the image of the second resolution from the recording medium when the distance to the object is short, as in the prior art. It can be done more smoothly.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such a specific embodiment, and various modifications are made within the scope of the gist of the present invention described in the claims.・ Can be changed.

Each functional unit of the image processing apparatus 10 may be realized by cloud computing composed of, for example, one or more computers. Further, the image processing device 10 may be a server for an online game that displays a game screen on a user's terminal.

In the above-described embodiment, an open world game has been described as an example, but the disclosed technique uses a predetermined object in a virtual three-dimensional space in a three-dimensional computer graphics such as a game or simulation other than the open world. Applicable when placed on top of other objects.

The recording medium 101 and the auxiliary storage device 102 are examples of "recording media", respectively. Further, the memory device 103 is an example of a “memory”.

10 Image processing device 11 Storage unit 111 3D data 12 Reception unit 13 Control unit 14 Generation unit 15 Display control unit

Claims (7)

For image processing equipment
For the first object whose distance from the predetermined position on the virtual three-dimensional space is equal to or greater than the first threshold value, the first data indicating the pixel value of the first resolution is read into the memory from the predetermined recording medium. Steps and
When the distance of the first object is less than the first threshold value, it is included in the first data among the values of the pixels of the second resolution including at least a part of the pixels of the first resolution. A step of reading the second data indicating the value of the pixel that cannot be used from the predetermined recording medium into the memory, and
A step of generating an image of the second resolution based on the first data and the second data, and
Using the generated image of the second resolution, the step of displaying the first object on the screen and the step of displaying the first object on the screen.
A program to execute. The predetermined position is the position of a second object operated by the user, or the position of the user's viewpoint on the virtual three-dimensional space.
The program according to claim 1. When the distance of the first object is less than the second threshold value smaller than the first threshold value, among the values of the pixels of the third resolution including at least a part of the pixels of the second resolution. A step of reading the first data and the third data indicating the values of pixels not included in the second data from the predetermined recording medium into the memory.
A step of generating an image having the third resolution based on the first data, the second data, and the third data.
Using the generated image of the third resolution, the step of displaying the first object and the step of displaying the first object.
The program according to claim 1 or 2, wherein the program is executed. When the distance of the first object changes to or more than the first threshold value, the step of generating the image of the first resolution using the generated image of the second resolution, and the step of generating the image of the first resolution.
Using the generated image of the first resolution, the step of displaying the first object and the step of displaying the first object.
The step of erasing the image of the second resolution from the memory and
The program according to any one of claims 1 to 3, wherein the program is executed. A step of recording the time when the image of the second resolution is used for displaying the first object in association with the image of the second resolution.
When the free space of the memory becomes equal to or less than a predetermined threshold value, the step of erasing the data of the image having the oldest time from the memory and the step of erasing the data.
The program according to any one of claims 1 to 4, wherein the program is executed. The image processing device
For the first object whose distance from the predetermined position on the virtual three-dimensional space is equal to or greater than the first threshold value, the first data indicating the pixel value of the first resolution is read into the memory from the predetermined recording medium. Steps and
When the distance of the first object is less than the first threshold value, it is included in the first data among the values of the pixels of the second resolution including at least a part of the pixels of the first resolution. A step of reading the second data indicating the value of the pixel that cannot be used from the predetermined recording medium into the memory, and
A step of generating an image of the second resolution based on the first data and the second data, and
Using the generated image of the second resolution, the step of displaying the first object on the screen and the step of displaying the first object on the screen.
Image processing method to execute. The first data indicating the value of the pixel of the first resolution is read into the memory from the predetermined recording medium for the first object whose distance from the predetermined position on the virtual three-dimensional space is equal to or greater than the first threshold value. ,
When the distance of the first object is less than the first threshold value, it is included in the first data among the values of the pixels of the second resolution including at least a part of the pixels of the first resolution. A control unit that reads the second data indicating the values of the pixels that cannot be stored into the memory from the predetermined recording medium, and the control unit.
A generation unit that generates an image having the second resolution based on the first data and the second data.
A display control unit that displays the first object on the screen using the generated image of the second resolution.
Image processing device with.

Images