JP2001239053A - Cross fade processing method, video game device, and computer-readable storage medium recording video game program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the color tone of a display image during the implementation of cross fade and to increase the degree of freedom on the period adjustment or the like of fade-in and fade-out. SOLUTION: An αa value and a mask image are specified at first (S21, S23), then blending is implemented at the αa value for the perspectively converted two-dimensional image stored in a frame buffer and the mask image (S25), and a generated first composite image is drawn in the frame buffer (S27). An αb value and a fade-in image are specified (S29, S31), then α-blending is implemented at the αb value for the first composite image stored in the frame buffer and the fade-in image (S33), and a generated second composite image is drawn in the frame buffer (S35). The second composite image is displayed on a display screen. Various composite modes of the perspectively converted two-dimensional image and the fade-in image can be freely set by changing the αa value and the αb value according to the prescribed curve becoming 0 at the prescribed timing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to image processing for video games, and more particularly to cross-fade processing in video games.

[0002]

2. Description of the Related Art Cross-fade processing is a process in which an image being displayed is gradually faded out while another image is gradually faded in at the same time. Is an image processing technique for changing the image to another image. For example, in the ending portion of a movie, the previous image and the black background “F
When cross-fade processing is performed between the image written in white and the image written in white, the image gradually becomes darker, and “Fin” is displayed there.
The word “white” emerges. Eventually, "F"
An image written in white is displayed.

For example, Japanese Patent Application Laid-Open No. H10-295934 discloses that one texture is changed to another texture by repeatedly superimposing images of two stereo models while changing the transparency of each image complementarily. A method for obtaining a moving three-dimensional model is disclosed. The term "complementary" means that when the sum is 1.0, when one is 0.3, the other is 0.7, and when one is 0.4, the other is 0.6.

[0004]

According to the method described in this publication, the displayed image can be continuously changed by complementarily changing the transparency of each image. However, since the two images before and after the transition are directly combined, the brightness at the time of combining the two images becomes complementary. If the brightness is complementary, it is difficult to individually adjust the change process such as the color tone of the image during the cross-fade and the time adjustment of the fade-in and fade-out for each image. Today, it is desired that the brightness of two images to be synthesized can be adjusted individually.

The present invention has been made in view of the above-described problems, and has as its object to provide a technique capable of individually setting a hue adjustment, a fade-in / fade-out time adjustment, and the like. I do.

[0006]

According to a first aspect of the present invention, there is provided a crossfade processing method in a video game, comprising:
After an arbitrary timing in the progress of the video game, a game image sequentially generated by the perspective transformation and an adjustment image (for example, a mask image in the embodiment) for adjusting the color of the game image are changed from the above timing. A first step of sequentially obtaining a first synthesized image by synthesizing according to a first synthesizing ratio (for example, αa value in the embodiment) whose value changes according to time, and a first step sequentially obtaining in the first step And a fade-in image to be cross-fade with the first synthesized image according to a second synthesis ratio (for example, αb value in the embodiment) whose value changes according to the elapsed time from the above timing. , A second step of sequentially acquiring the second composite image, and a third step of displaying the second composite image sequentially acquired in the second step.

[0007] Since the values of both the first composite ratio and the second composite ratio change according to the elapsed time from the above-mentioned arbitrary timing, the color adjustment of the first composite image and the second composite image, the fade-in, and the like. It is possible to freely adjust the fade-out period. This makes it possible to enhance the effect of the display image during the crossfade.

[0008] The second method for acquiring the second composite image described above.
The step is such that the first composite image sequentially acquired in the first step and the fade-in image to be cross-fade with the first composite image are set to values such that only the first composite image is displayed for a predetermined time from the above timing. May be held according to a second synthesis ratio in which the value is changed and the value is changed according to the elapsed time after a predetermined time, and a second synthesized image is sequentially acquired.

With this configuration, the fade-in timing of the fade-in image can be delayed by a predetermined time. That is, the fade-in timing of the fade-in image can be freely set.

The first method for obtaining the first composite image described above
A step is to set a game image sequentially generated by perspective transformation and an adjustment image for adjusting the color of the game image after an arbitrary timing in the progress of the video game in accordance with the elapsed time from the above timing. May be changed in such a manner that each pixel is synthesized according to a first synthesis ratio for each pixel, and a first synthesized image is sequentially obtained.

The first combination ratio may be different for each pixel, or may be the same for all pixels. The first combination ratio may be set in advance for each pixel, or the first combination ratio of each pixel may be determined at the time of processing by calculation. Also,
In some cases, the second combination ratio is prepared for each pixel in the same manner as the first combination ratio.

[0012] The first step of obtaining the first composite image described above may include a step of obtaining an adjustment image by drawing one or a plurality of polygons prepared in advance. Is also possible. Various images can be used for the adjustment image used in the present invention.

Further, the first step of obtaining the first composite image may include a step of obtaining an adjustment image by drawing an area determined by the coordinate designation with a predetermined color scheme.

The first method for acquiring the first composite image described above
Step is the area (for example, rectangle) corresponding to the adjustment image
A step of calculating a first combination ratio for each pixel included in the region by interpolating a first combination ratio set for a plurality of pixels (e.g., vertexes of a rectangle) at a predetermined position. It is also possible to use

[0015] It is possible to create a program for causing a computer to execute the crossfade processing method in a video game according to the first aspect of the present invention. that time,
The above-described modification to the first embodiment is applicable to the program. The program according to the present invention is, for example, a CD-ROM (Compact Disc-Read OnlyMe).
mory), a DVD (Digital Versatile Disc), a floppy disk, a memory cartridge, a memory, a hard disk, and other recording media or storage devices. The video game device described below can be realized by causing a computer to read a program stored in a recording medium or a storage device. Further, the recording medium allows the program according to the present invention to be easily distributed and sold as a software product independently of the device. Further, by executing the program according to the present invention using hardware such as a computer, the image processing technique of the present invention can be easily implemented using hardware such as a computer.

A video game apparatus according to a second aspect of the present invention is a video game device for adjusting a game image sequentially generated by a perspective transformation and a color of the game image after an arbitrary timing in the progress of the video game. A first combined image acquiring unit that combines the image and the first combined image according to a first combining ratio in which a value changes according to an elapsed time from the timing, and sequentially acquires the first combined image; Are synthesized in accordance with a second synthesis ratio, the value of which is changed in accordance with the elapsed time from the timing, with the first synthesized image sequentially acquired by the above and a fade-in image to be cross-fade with the first synthesized image. , A second combined image acquiring unit for sequentially acquiring the second combined image, and a display unit for displaying the second combined image sequentially acquired by the second combined image acquiring unit.

The modifications described for the first aspect of the present invention can be applied to the video game device according to the second aspect of the present invention.

A video game device according to a third aspect of the present invention has a computer and a computer-readable recording medium on which a program to be executed by the computer is recorded. Then, the program causes the computer to transmit a game image sequentially generated by perspective transformation and an adjustment image for adjusting the color of the game image from an arbitrary timing in the progressing process of the video game from the timing. Are synthesized according to a first synthesis ratio whose value changes according to the elapsed time of the first synthesized image, and a first synthesized image obtaining process for sequentially obtaining the first synthesized image, and a first synthesized image obtaining process sequentially obtained in the first synthesized image obtaining process And a fade-in image to be cross-fade with the first synthesized image according to a second synthesis ratio in which a value changes according to an elapsed time from the timing, and the second synthesized image is sequentially formed. A second composite image generation process to be acquired and a display process to display second composite images sequentially acquired in the second composite image acquisition process are executed.

The modification described for the first aspect of the present invention can be applied to the video game apparatus according to the third aspect of the present invention.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a consumer game machine 101 that executes the computer program when the present invention is implemented by a computer program. The home game machine 101 includes, for example, an internal bus 119.
(Central Processing Unit) 10 connected to
3. ROM (Read Only Memory) 104, RAM (Rand
om Access Memory) 105, HDD (Hard Disk Driv)
e) a sound processing unit 109, a graphics processing unit 111, a CD-ROM drive 113, a communication interface 115, and an interface unit 117; The graphics processing unit 111 includes a frame buffer 112. The frame buffer 112 is a VRAM
(Video RAM).

Sound processing unit 1 of home game machine 101
09 and the graphics processing unit 111
And a TV set 121 having a speaker 122. The CD-ROM drive 113 is equipped with a removable CD-ROM 131. CD-ROM
131 stores a game program 133 and data 135 according to the present invention. The communication interface 115 is connected to the network 151 via the communication medium 141. The interface unit 117 includes a keypad 161 having operation buttons and a memory card 171.
Is connected.

The CPU 103 executes the program stored in the ROM 104 and the game program 133 recorded on the CD-ROM 131, and
1 is performed. The RAM 105 is a work area of the CPU 103. The HDD 107 is, for example, a CD-ROM
A storage area for storing the game program 133 and data 135 recorded on the storage 131. The memory card 171 is a storage area for storing data referred to by the game program 133. When the program executed by the CPU 103 instructs to output sound, the sound processing unit 109 interprets the instruction and outputs a sound signal to the TV set 121. Then, the sound signal is output from the speaker 122 of the TV set 121 as a sound.

The graphics processing unit 111 includes a CPU 1
In accordance with the drawing command output from the image processing unit 03, image data is generated and written into the frame buffer 112. Then, a signal for displaying the written image data on the display screen 120 is output to the TV set 121. The CD-ROM drive 113 reads the game program 133 and data 135 on the CD-ROM 131. The communication interface 115 is connected to the network 151 via the communication medium 141 and controls input / output of data communication performed with another computer or the like. The interface unit 117 receives an input from the keypad 161 and stores it in the RAM 105.
, And the CPU 103 interprets the input from the keypad 161 to execute the arithmetic processing.

The game program 133 and the data 135 according to the present invention are initially recorded on the CD-ROM 131, for example. Then, the game program 133 and the data 135 are read out by the CD-ROM drive 113 at the time of execution, and loaded into the RAM 105. CD
The game program 133 and the data 135 according to the present invention recorded in the ROM 131 are stored in a CD-ROM in advance.
The data may be read by the drive 113 and stored in the HDD 107. When the game program and data 108 according to the present invention are stored in the HDD 107, the game program and data 108 are loaded from the HDD 107 into the RAM 105.

The CPU 103 loads the game program 133 and data 1 according to the present invention loaded into the RAM 105.
35, and renders the drawing command to the graphics processing unit 111.
Output to The intermediate data is stored in the RAM 105. The graphics processing unit 111 is a CPU 103
The image data is written to the frame buffer 112, and a signal to be displayed on the display screen 120 is output to the TV set 121.

The algorithm of the game program according to the present invention executed on the above-mentioned consumer game machine 101 and the data used will be described in detail below.

The data used in the present invention will be described with reference to FIGS.

FIG. 2 is a schematic diagram showing a state of the RAM 105 during execution of the game program according to the present invention. R
The AM 105 is provided with a program storage area 1051, a related data storage area 1053, and a work area 1057. The program storage area 1051 stores a game program according to the present invention. The crossfade setting table 1055 described with reference to FIG. 3 is stored in the related data storage area 1053.

The work area 1057 contains a mask image 1
059 and a fade-in image 1065 are stored.
The mask image 1059 is an image to be combined with the perspective-transformed two-dimensional image to be faded out. The perspective-transformed two-dimensional image to be faded out is drawn in the frame buffer 112. Mask image 1059
Are usually prepared in plural, and here, the mask image M1
(1061) and the mask image M2 (1063). However, the number of the mask image 1059 may be one. The fade-in image 1065 is an image to be faded in, and is an image for performing the second synthesis with a composite image of the mask image 1059 and the two-dimensional image to be faded out. Usually, a plurality of fade-in images 1065 are also prepared, and here, the fade-in image F1 (106
7) and the fade-in image F2 (1069). However, the number of the fade-in image 1065 may be one.

FIG. 3 shows a crossfade setting table 1055 included in the related data storage area 1053. The crossfade setting table 1055 is a table for storing an ID of a mask image and an ID of a fade-in image used for each crossfade point, a function of an αa value described later, and a function of an αb value described later. . Therefore, in the crossfade setting table 1055, the column 201 of the mask image ID and the fade-in image I
D column 203, αa function column 209, αb function column 2
11 are provided. In the example of FIG. 3, the mask image ID corresponding to the crossfade point 1 (205) is M
1, and the fade-in image ID is F1. Also,
The αa function corresponding to crossfade point 1 (205) is Fa1 (t), and the αb function is Fb1 (t). Thus, it can be seen that the αa function and the αb function are also functions of the time t. As described later, the time t means the elapsed time t. The mask image ID corresponding to the cross fade point 2 (207) is M2, and the fade-in image I
D is F2. Crossfade point 2 (207)
Is α2 (t) and αb function is Fb2 (t)
It is.

In the algorithm of the game program 133 according to the present invention, which will be described later, when the timing for performing the crossfade comes, the crossfade point number in the game program 133 is determined. The determined crossfade point number is searched in the crossfade setting table 1055, and the mask image ID and the fade-in image ID to be used are obtained. Using these IDs, a mask image 1059 and a fade-in image 1065 on the work area are obtained.

The crossfade setting table 105
5 is an example, and it is not necessary to hold the information described above in a table shape. For example, it may be described on the game program 133 according to the present invention.

As another data used in the present invention, there is an α value. The α value is a value representing the transparency used in α blending. In the present invention, the α value includes αa used for synthesizing (α blending) the masked image 1059 and the perspective-transformed two-dimensional image to be faded out, and the first synthesized image related to the first synthesis result and the fade-in. There is αb used for synthesis with an image (α blending).

These αa and αb values are defined in the crossfade setting table 1055 according to the present invention. The αa and αb values are set for each crossfade point.

FIG. 4 is a graph showing an example of the time change of the αa and αb values. In the graph shown in FIG. 4, the vertical axis indicates the magnitude of the α value, and the horizontal axis indicates time (unit is seconds). The α value is a real number from 0 to 1. The crossfade processing start time is set to 0.0 seconds. The αa value is indicated by a solid line 301 in FIG. 4 and linearly decreases from 1.0 at the crossfade processing start time (0.0 seconds) to 0.0 at the crossfade processing end time (4.0 seconds). are doing.

On the other hand, the αb value is indicated by a dotted line 303 in FIG. 4, and is maintained at 1.0 for 0.5 second from the crossfade processing start time (0 second). Thereafter, the αb value decreases linearly from 0.5 seconds to 2.5 seconds. Further, the αb value is kept at 0.0 from 2.5 seconds to 4.0 seconds.

When the above αa and αb values are defined, the crossfade period is between 0.0 seconds and 4 seconds. In addition, the fade-in period is 0.5 seconds to 4.
It is between 0 seconds. The fade-out period is between 0.0 and 4.0 seconds.

Here, α blending will be briefly described. When the color of a certain pixel of the input image A is represented by three primary colors of RGB (Ar, Ag, Ab), and the color of the corresponding pixel of the input image B is also represented by three primary colors of RGB (Br, Bg, Bb). I do. Assuming that the α value is α, the color (Cr, Cg, Cb) of the corresponding pixel of the output image C is expressed by the following equation. Cr = (Ar-Br) α + Br = Arα + (1-α) Br (1-1) Cg = (Ag-Bg) α + Bg = Agα + (1-α) Bg (1-2) Cb = (Ab-Bb) α + Bb = Ab .alpha. + (1-.alpha.) Bb (1-3) The above is simplified for each image and described as follows. C = (AB) α + B = Aα + (1−α) B (2)

(Embodiment 1) The data described above is used in the present invention. Before describing the processing of the game program 133 in the first embodiment, the principle of the operation according to the first embodiment will be described with reference to FIGS.

FIG. 5 shows a perspective-transformed two-dimensional image 2001 to be faded out. Two-dimensional image 20
01 includes a black ring. FIG. 6 shows a mask image 2003. The mask image 2003 is entirely black. FIG. 7 shows a fade-in image 2005. In the fade-in image 2005, white END characters are embedded on a black background.

For example, when the αa value is set to 0.5, the two-dimensional image 2001 in FIG. 5 and the mask image 2003 in FIG.
When the blending is performed, a first composite image 2007 as shown in FIG. 8 is obtained. The base portion 2007a other than the black ring in the first composite image 2007 becomes lighter gray than the mask image 2003. The black ring portion does not change much because the original mask and the black ring of the two-dimensional image 2001 are also black.

When the αa value is changed from 1.0 to 0.0, the first composite image 2007 changes from the two-dimensional image 2001 to the mask image 2003. This is clear when the two-dimensional image 2001 is represented by A in Expression (2) and the mask image 2003 is represented by B in Expression (2).

The main purpose of the first α-blending is to adjust the luminance of the perspective-transformed two-dimensional image 2001. In particular, when the mask image 2003 is entirely black as shown in FIG. 6, the brightness value of the two-dimensional image 2001 gradually decreases by performing α blending such that the αa value decreases.

When adjusting the luminance of the two-dimensional image after the perspective transformation, as a more precise method of adjusting the luminance, for example, there is a method of changing the setting of the light source and recalculating the light source. However, this method increases the amount of calculation for adjusting the luminance.

On the other hand, the perspective transformed two-dimensional image 20
Α blending between 01 and the mask image makes it possible to easily adjust the brightness of the two-dimensional image 2001, and to reduce the amount of calculation required for the brightness adjustment.

Next, when the αb value is set to 0.5 and α blending is performed on the first composite image 2007 of FIG. 8 and the fade-in image 2005 of FIG. 7, the second composite image shown in FIG. 9 is obtained. A composite image 2009 is obtained. Second synthetic image 2009
Of the background 2009a is the fade-in image 20
Since the background of 05 is black, it is darker gray than the background 2007 a of the first composite image 2007. The ring portion remains black because the first composite image 2007 is also black and the base of the fade-in image 2005 is also black.
In the fade-in image 2005, white END is affected by the background of the first composite image 2007 and is lighter gray than the background portion 2009a of the second composite image 2009.

When the αb value is changed from 1.0 to 0.0, the second synthesized image 2009 becomes the first synthesized image 200
7 to a fade-in image 2005. This is clear when the first synthesized image 2007 is represented by A in Expression (2) and the fade-in image 2005 is represented by B in Expression (2).

The second composite image 2009 is displayed on the display screen 1
20 is an image displayed on the screen. The second alpha blending is mainly performed on the two-dimensional image 2001 and the fade-in image 2005.
It is intended for indirect synthesis of. If the αa and αb values are changed from 1.0 to 0.0, respectively, the two-dimensional image 2001 is gradually changed to the fade-in image 2005 as a result. The process of the change can be adjusted by controlling the time change of the αa value and the αb value.

That is, first, the two-dimensional image 200 shown in FIG.
1 is displayed on the display screen 120. αa and αb values are 0.
5, the second composite image 2009 of FIG.
20 is displayed. Finally, when the αa and αb values become 0.0, the fade-in image 2005 of FIG. 7 is displayed on the display screen 120.

Embodiment 1 based on the above assumptions
Will be described.

At the time of startup, the CPU 103
And the like, based on the operating system stored in the CD-ROM drive 113 via the CD-ROM drive 113.
A game program 133 and data 135 necessary for image processing and game execution are read from the
To transfer. Then, the CPU 103
By executing the game program 133 transferred to the server, the processing described below is realized.

In the control and processing performed by the home game apparatus 101, circuits other than the CPU 103 include CPs.
Actual control and processing may be performed in cooperation with U103. For convenience of explanation, control and processing related to the CPU 103 will be described below assuming that the CPU 103 is directly executing the control and processing.

The game program 133 and the data 135 necessary for executing the image processing and the game are read out from the CD-ROM 131 sequentially according to the progress of the processing in accordance with the instruction from the CPU 103 and read out from the RAM.
Transferred to 105. However, in the following description, descriptions relating to data reading from the CD-ROM 131 and transfer to the RAM 105 are omitted to facilitate understanding of the invention.

If the game program 133 and the data 135 necessary for executing the image processing and the game are stored in the HDD 1
07, the data is sequentially read from the HDD 107 and transferred to the RAM 105 in accordance with the processing progress according to the instruction from the CPU 103. However, in the following description, for the same reason as described above, the HD
A description of reading data from D107 and transferring data to RAM 105 is omitted.

FIG. 10 shows a main flow of the display processing according to the first embodiment. First, it is determined whether it is the present display cycle (step S1). Since an image is normally displayed on the display screen 120 at 30 frames or 60 frames per second, the frame interval, which is the display cycle, is 1/30 seconds or 1
/ 60 seconds. If it is not the current display cycle, it is determined whether the game is over (step S17). If the game is over, the process is terminated.
Return to 1.

If it is determined in step S1 that the current display period is currently set, a game process is executed (step S3). In the game process in step S3, a game progress process according to a user's operation input using the keypad 161 is performed. In addition, according to an operation input or the like, setting of a viewpoint position, operation calculation of a three-dimensional model, and the like are also performed.
Further, as described above, when the current process reaches the crossfade point specified in the game program according to the present embodiment, the crossfade execution flag is set from 0 to 1. The current crossfade point number is also stored in work area 1 of RAM 105.
057.

Next, rendering is executed (step S5). In the rendering processing in step S5,
Light source calculation and perspective transformation are performed based on the set viewpoint position and the calculated shape and orientation of the three-dimensional model. The perspective transformation is for transforming the coordinate values of each vertex of a polygon in the world coordinate system into coordinate values in the screen coordinate system. Then, the image after the perspective transformation is stored in the frame buffer 11.
Draw on 2. The light source calculation is to calculate a shadow (luminance) generated by a virtual light ray emitted from the light source. Thus, the perspective-transformed two-dimensional image is generated in the frame buffer 112.

After the rendering, it is determined whether it is the timing of the cross-fade processing (step S7). Whether or not the timing of the cross-fade processing is determined is based on whether or not the cross-fade execution flag is “1”. If it is not the timing of crossfade processing,
The process proceeds to step S15, where the perspective transformed two-dimensional image drawn in the frame buffer 112 is displayed.

On the other hand, when it is determined that the timing of the cross-fade processing is reached, the cross-fade processing described in detail with reference to FIG. 11 is executed (step S).
9). After the cross-fade processing is executed, it is determined whether to end the cross-fade processing (step S1).
1). The determination as to whether to end the crossfade processing is made based on the elapsed time from the start of the crossfade processing. That is, it is determined whether or not the elapsed time from the start of the crossfade processing has passed a predetermined end time.

If the cross-fade processing is not to be ended, the flow shifts to step S15. On the other hand, when ending the crossfade processing, the value of the crossfade execution flag is reset from 1 to 0 (step S13). Then, a display process is executed (step S15). That is, at this point, the image drawn in the frame buffer 112 is displayed on the display screen 120 of the TV set 121.

Finally, it is determined whether to end the game (step S17). Whether or not to end the game is determined based on, for example, whether the user has operated the keypad 161 to order the end of the game, or whether a condition for ending the game in the story of the game has been satisfied. If the game is not to be ended, the process returns to step S1. When ending the game, the processing is ended.

Next, the crossfade processing will be described with reference to FIG. In the crossfade processing, first, an αa value is set based on the αa function defined in the crossfade setting table 1055 (step S21). αa value is
As described above, this is an α value used for α blending of the two-dimensional image after the perspective transformation and the mask image. αa
The value changes with time, for example, as shown in FIG.

Next, a mask image is designated (step S
23). This processing is performed in the crossfade setting table 10
Referring to 55, a mask image ID is acquired from the crossfade point number at the time of execution of this processing, and the mask image is specified from the mask image ID.

Thereafter, α-blending of the image stored in the frame buffer 112 (the perspective-transformed two-dimensional image) and the mask image is executed (step S2).
5). Then, the first composite image generated by the α blending is drawn in the frame buffer 112 (step S27). When the perspective-transformed two-dimensional image is image A, the mask image is image B, and the first composite image is image C,
The α blending based on the αa value is obtained by calculating the image C = (image A−
Image B) It can be expressed as a process of generating αa + image B. This completes the first α blending.

Next, an αb value used for α blending between the first composite image and the fade-in image is set based on the αb function defined in the crossfade setting table 1055 (step S29). The αb value also changes with time, for example, as shown in FIG. Then, a fade-in image is designated (step S31). This process is performed by referring to the cross-fade setting table 1055, acquiring the fade-in image ID from the cross-fade point number at the time of execution of this process, and specifying the fade-in image from the fade-in image ID.

Then, α blending of the image (here, the first composite image) stored in the frame buffer 112 and the fade-in image is executed (step S3).
3). Then, the second composite image generated by the α blending is drawn in the frame buffer 112 (step S35). Assuming that the first composite image is image A, the fade-in image is image B, and the second composite image is image C,
The α blending based on the αb value can be expressed as a process of generating image C = (image A−image B) αb + image B. This completes the second α-blending.

A second composite image as a result of the second α blending is displayed in step S15 of FIG. Drawing on the frame buffer 112 is performed three times for convenience.

As described above, in the first embodiment of the present invention, after the crossfade processing start timing in the progress of the video game, the two-dimensional images sequentially generated by the perspective transformation and the colors of the two-dimensional images are adjusted. And a mask image to be synthesized according to the αa value whose value changes according to the elapsed time from the start timing of the cross-fade processing, and the first synthesized image is sequentially obtained (step S2).
5).

Then, the first synthesized image and the fade-in image to be cross-fade with the first synthesized image are synthesized according to the αb value whose value changes according to the elapsed time from the start timing of the cross-fade processing, The second composite images are sequentially obtained (Step S27). Then the second
Is displayed on the display screen 120 (step S
15).

Instead of directly synthesizing a perspective-transformed two-dimensional image and a fade-in image to generate an image to be displayed, a two-stage synthesis using a αa and αb value with a mask image interposed is used. Is going.

As a result, it is possible to individually set the way of disappearing the fade-out image and the way of appearing the fade-in image. The timing at which the fade-out image starts to disappear and the timing at which the fade-in image appears can be arbitrarily set.

Further, it is possible to effectively adjust the color such as the luminance and the hue of the composite image finally displayed. Therefore, the creator's freedom of expression is increased.

The αa and αb values can be set individually. The setting can be made in consideration of not only the appearance on the display screen 120 but also the relationship with the sound. In addition to the one shown in FIG. 4, it is also possible to adopt a change in the value as shown in the graph of FIG. 12, for example. In FIG. 12, as in FIG. 4, the vertical axis indicates the value of the α value (real number of 0 to 1).
The horizontal axis indicates time (unit is seconds). In FIG. 12, a solid line 305 indicates a change in the αa value. On the other hand, the dotted line 307
Indicates a change in the αb value. As can be seen in FIG.
The αa value starts to decrease linearly from 1.0 immediately after the start of the crossfade processing, and becomes 0.0 in the middle of the crossfade period.
Reach. That is, the image that fades out disappears completely in the middle of the cross-fade period. The fade-out period also ends when the αa value reaches 0.0.

On the other hand, the value αb is maintained at 0.0 until the value αa reaches 0.5. When the αa value reaches 0.5, 1.
Start decreasing from zero. That is, the fade-in period is α
It starts when the value a reaches 0.5. The αb value is not a straight line but decreases according to a downwardly convex curve. Thus α
The change in the value need not be linear. It may change in a curve. As shown in the example of FIG. 12, the shape may decrease in accordance with an upwardly convex curve instead of being downwardly convex.
When the αb value decreases to 0.0, the fade-in period ends, and the cross-fade period also ends.

Although the change curve of the α value is defined by a function, for example, it is also possible to adopt a method in which a table in which the numerical value of the α value is set for each frame is separately provided and the table is referred to. .

Although the relationship between the cross fade and the sound has been described above, in a video game, the sound and the image have a close relationship. By synchronizing the image and the sound well, the viewer can be further impressed. An important point in that case is the timing adjustment of the video and sound.

When the cross-fade processing method according to the present embodiment is used, it is possible to freely set the fade start, end, fade degree, and the like of two images, and to adjust and correct timing in synthesizing sound with a game during game development. Can be easily implemented.

(Second Embodiment) In the first embodiment, it is assumed that the αa and αb values are the same for all pixels of the mask image and the fade-in image. In this manner, the entire screen is uniformly cross-faded from the perspective-transformed two-dimensional image to the fade-in image.

However, it is not always necessary to use the same α value for all pixels of the mask image and the fade-in image.
Another additional effect can be obtained by using different α values.

For example, a distribution of α values as shown in FIG. 13 can be adopted. In FIG. 13, darker values indicate smaller α values (lower transparency of the mask image), and lighter values indicate higher α values (higher transparency of the mask image). As in the first embodiment, the perspective-transformed two-dimensional image 2001 in FIG. 5 and the mask image 2003 in FIG.
The case where the fade-in image 2005 of FIG. 7 is used will be described below.

If the two-dimensional image 2001 and the mask image 2003 are subjected to α blending using the α value distribution shown in FIG. 13 as the αa value distribution, a first composite image 2011 shown in FIG. 14 is obtained. In the first composite image 2011 of FIG. 14, since the αa value is 0 at the upper left of the image, a part of the mask image 2003 appears at the upper left of the image. Since the αa value gradually increases from the upper left of the image to the lower right of the image, the black generated from the mask image 2003 gradually decreases. On the other hand, the two-dimensional image 2001 (black ring) gradually appears because the αa value has a higher value from the upper left to the lower right of the image.

For the first composite image 2011 and the fade-in image 2005, the distribution of α values shown in FIG.
If α blending is performed as the value distribution, a second composite image 2013 shown in FIG. 15 is obtained. Second composite image 20
In FIG. 13, since the αb value is 0 at the upper left of the image, a part of the fade-in image 2005 appears at the upper left of the image. In particular, a white END character embedded in the fade-in image 2005 has a character portion 2013 while the αb value is low.
It is drawn in gray on a. However, the character portion 2013a is
When the lower right part of the image shifts to a portion having a higher αb value, the first synthesized image 2011 appears so strongly that it disappears. In the lower right part of the image, almost the same as the lower right part of the first composite image 2011 in FIG. 14 is displayed.

If the α value at the lower right of the image is gradually lowered in the distribution of α values as shown in FIG. 13, the character portion 2013a in FIG. 15 gradually approaches the END character and the END character It becomes gradually whiter. Further, the white at the lower right of the image gradually becomes black. Eventually, only the fade-in image 2005 appears. That is, first, the perspectively transformed two-dimensional image 2001 shown in FIG. 5 is displayed, and as shown in FIG. 14, a composite image in which some END characters appear in gray is displayed. The process proceeds to the fade-in image 2005 in FIG.

As the distribution of the α values, not only the distribution as shown in FIG. 13 but also, for example, the distribution of the α values as shown in FIG. 16 can be adopted. That is, the α values (α0 to α3) of the vertexes P0 to P3 of the four corners of the mask image are set to 0, 1,
It is set to 1, 1 and each pixel in the mask image is a value obtained by interpolating the α values of the vertices P0 to P3. FIG. 16 shows contour lines of the α value. From vertex P0 to other vertices P1 through P
The α value gradually increases toward 3. That is,
It is possible to obtain a distribution of α values as if gradation was applied from the upper left of the mask image to the lower right of the mask image. If such a distribution of α values is adopted, it is possible to display an image that gradually cross-fade from the upper left of the screen to the lower right of the screen.

[0085] If the distribution of such α values as in Figure 16 was the distribution of .alpha.a value, and .alpha.a ₀ to α value of the vertex P0, and .alpha.a ₁ the α value of the vertex P1, and .alpha.a ₂ the α value of the vertices P2 And the α value of vertex P3 is αa ₃
I will write. On the other hand, when the distribution of such α values as in FIG. 16 and the distribution of .alpha.b value, and .alpha.b ₀ to α value of the vertex P0, and .alpha.b ₁ the α value of the vertex P1, and .alpha.b ₂ the α value of the vertices P2, Vertex P3
To the α value to be referred to as αb _3.

[0086] An example of time change of .alpha.a ₀ to .alpha.a ₃ and .alpha.b ₀ to .alpha.b ₃ shown in FIG. 17. In FIG. 17, the vertical axis represents the α value (real number from 0 to 1), and the horizontal axis represents time (unit: seconds). The solid line 309 shows the change with time of .alpha.a ₁ to .alpha.a ₃ are each corresponding α values at the vertices P1 to P3. These α values decrease linearly from the value 1.0 at the crossfade processing start time, and decrease to 0.0 at time 4.0 seconds. On the other hand, .alpha.a ₀ thick line 313 vertices P0 and .alpha.b ₀
Is shown. These values are consistently 0.0 from the crossfade processing start time to the end of the crossfade period.

A dotted line 211 indicates a temporal change of αb _{1 to} αb ₃ corresponding to the vertices P 1 to P 3, respectively. These α values are set to 1. for 0.5 seconds from the start of the crossfade processing.
Although it remains at 0, it does not change, but decreases linearly from the α value of 1.0 at 0.5 seconds to the α value of 0.0 at 2.5 seconds.

Therefore, in FIG. 17, the cross-fade period is from the cross-fade processing start time to 4.0 seconds, and the cross-fade period is a fade-out period. On the other hand, the fade-in period is from 0.5 seconds to 4.0 seconds.

A processing flow according to the second embodiment will be described based on the above assumptions.

The CPU 103 activates the ROM 104
And the like, based on the operating system stored in the CD-ROM drive 113 via the CD-ROM drive 113.
A game program 133 and data 135 necessary for image processing and game execution are read from the
To transfer. Then, the CPU 103
By executing the game program 133 transferred to the server, the processing described below is realized.

Note that some of the control and processing performed by the home game device 101 include circuits other than the CPU
Actual control and processing may be performed in cooperation with U103. For convenience of explanation, control and processing related to the CPU 103 will be described below assuming that the CPU 103 is directly executing the control and processing.

The game program 133 and the data 135 necessary for executing the image processing and the game are actually read out from the CD-ROM 131 sequentially according to the progress of the processing in accordance with the instruction from the CPU 103 and read out from the RAM.
Transferred to 105. However, in the following description, descriptions relating to data reading from the CD-ROM 131 and transfer to the RAM 105 are omitted to facilitate understanding of the invention.

If the game program 133 and the data 135 necessary for executing the image processing and the game are stored in the HDD 1
07, the data is sequentially read from the HDD 107 and transferred to the RAM 105 in accordance with the processing progress according to the instruction from the CPU 103. However, in the following description, for the same reason as described above, the HD
A description of reading data from D107 and transferring data to RAM 105 is omitted.

The main flow of the display processing according to the first embodiment shown in FIG. 10 is the same in the first embodiment as long as it is shown in FIG. First, it is determined whether it is the present display cycle (step S1). If it is not the current display cycle, it is determined whether the game is over (step S17). If the game is over, the process ends, and if not, the process returns to step S1.

If it is determined in step S1 that the current display cycle is currently set, a game process is executed (step S3). In the game process in step S3, a game progress process according to a user's operation input through the keypad 161 is performed. In addition, according to an operation input or the like, setting of a viewpoint position, operation calculation of a three-dimensional model, and the like are also performed. Further, as described above, when the current process reaches the crossfade point specified in the game program according to the present embodiment, the crossfade execution flag is set from 0 to 1. The current crossfade point number is also stored in the work area 1057 of the RAM 105.
Shall be stored in

Next, rendering is executed (step S5). In the rendering processing in step S5,
Light source calculation and perspective transformation are performed based on the set viewpoint position and the calculated shape and orientation of the three-dimensional model. Thus, the perspective-transformed two-dimensional image is generated in the frame buffer 112.

After the rendering, it is determined whether it is the timing of the cross-fade processing (step S7). Whether or not the timing of the cross-fade processing is determined is based on whether or not the cross-fade execution flag is “1”. If it is not the timing of crossfade processing,
The process proceeds to step S15, where the perspective-transformed two-dimensional image drawn in the frame buffer 112 is displayed.

On the other hand, if it is determined that the timing of the cross-fade processing has been reached, the cross-fade processing described in detail with reference to FIG. 18 is executed (step S).
9). After executing the crossfade processing, it is determined whether to end the crossfade processing (step S1).
1). The determination as to whether or not to end the crossfade processing is made based on the elapsed time from the start of the crossfade processing. That is, it is determined whether or not the elapsed time from the start of the crossfade processing has passed a predetermined end time.

If the cross-fade processing is not to be ended, the flow shifts to step S15. On the other hand, when ending the crossfade processing, the value of the crossfade execution flag is reset from 1 to 0 (step S13). Then, a display process is executed (step S15). That is, at this point, the image drawn in the frame buffer 112 is displayed on the display screen 120 of the TV set 121.

Finally, it is determined whether to end the game (step S17). Whether or not to end the game is determined, for example, based on whether or not a game ending condition is satisfied in the story of the game. If the game is not to be ended, the process returns to step S1. When ending the game, the processing is ended.

The details of the crossfade processing in the second embodiment will be described with reference to FIG.

In the crossfade processing, first, αa ₀ ,
The values of αa ₁ , αa ₂ and αa ₃ are set (step S4)
1). The αa _{0 to} αa ₃ values are α values used for α blending of the masked image and the perspective-transformed two-dimensional image as described above. These α values also change with time, for example, as shown in FIG.

Next, the αa value for each pixel is calculated (step S43). This can be obtained by interpolating αa _{0 to} αa ₃ set in step S41. For example, a function included in the graphics processing unit 111 can be used for the interpolation processing.

Next, a mask image is designated (step S
45). This processing is performed in the crossfade setting table 10
Referring to 55, a mask image ID is acquired from the crossfade point number at the time of execution of this processing, and the mask image is specified from the mask image ID.

Thereafter, α blending of the image (the perspective-transformed two-dimensional image) stored in the frame buffer 112 and the mask image is executed (step S4).
7). Then, the first composite image generated by the α blending is drawn in the frame buffer 112 (step S49). The details of the processing to be performed are the same as those in the first embodiment, and have been described in the description of the α blending (1-1).
Equations (1-3) to (1-3) are applied to each pixel to determine the luminance value of the pixel. However, the difference from the first embodiment is that the α value differs for each pixel. This completes the first α blending.

Next, the values of αb ₀ , αb ₁ , αb ₂ and αb ₃ used for α blending of the first composite image and the fade-in image are set (step S51).

Next, the αa value for each pixel is calculated (step S53). These α values also change with time, for example, as shown in FIG. This can be obtained by interpolating αb _{0 to} αb ₃ set in step S51. For example, the graphics processing unit 1
11 can be used.

Then, a fade-in image is designated (step S55). This process is performed by referring to the cross-fade setting table 1055, acquiring the fade-in image ID from the cross-fade point number at the time of execution of this process, and specifying the fade-in image from the fade-in image ID.

Then, α blending of the image (here, the first composite image) stored in the frame buffer 112 and the fade-in image is executed (step S3).
3). Then, the second composite image generated by the α blending is drawn in the frame buffer 112 (step S35). The content of this processing is not different from that of the first embodiment. That is, the above-described processes (1-1) to (1-3) are performed for each pixel. However, the αb value is set for each pixel. This completes the second α-blending.

A second synthesized image as a result of the second α blending is displayed in step S15 in FIG. Drawing on the frame buffer 112 is performed three times for convenience.

As described above, the frame buffer 1
12, since the α-blending of the image once written and another image is performed, the memory use efficiency is high.

As described above, the second embodiment of the present invention
Then, after the cross-fade processing start timing in the progress of the video game, the two-dimensional image sequentially generated by the perspective transformation and the mask image for adjusting the color of the two-dimensional image are changed from the cross-fade processing start timing. The α blending is performed for each pixel according to the αa value for each pixel, the value of which changes with time, and a first composite image is sequentially acquired (step S47).

The value of the first combined image and the fade-in image to be cross-fade with the first combined image are changed according to the elapsed time from the cross-fade processing start timing. According to α
Blending is performed, and second composite images are sequentially obtained (step S57). Thereafter, the second composite image is displayed on the display screen 120 (Step S15).

By interpolating α _{0 to} α ₃ set for a plurality of pixels at predetermined positions (for example, four corners of a rectangle) of a region (for example, a rectangle) corresponding to the two-dimensional image and the mask image,
Calculating the α value for each pixel can also be done individually for all pixels.
It is also possible to set a value.

As a result, it is possible to adjust the brightness and the transparency of not only the entire image but also a part of the image. That is, not only cross-fading of the entire image but also partial cross-fading of the image can be performed.

[0116] Therefore, it is possible to achieve a higher level of stunning expression and to give the user a greater impression.

(Other Embodiments) (1) In Embodiments 1 and 2, the entire image is a target area for crossfading, but the present invention is not limited to this. For example, a partial area of the image is set in advance, and it is possible to perform crossfading only in this partial area.

(2) The mask image used in the first and second embodiments is entirely black, but the present invention is not limited to this. For example, a configuration is also possible in which one or more polygons are set, and an image obtained by drawing the polygons is used as a mask image.
For example, there is a case where texture mapping is used, a case where a color is designated for each vertex of a polygon, and the inside of the polygon is drawn based on the color.

Further, for example, it is also possible to adopt a configuration in which a rectangular area is specified by specifying coordinates in the frame buffer 112, and an image obtained by performing a process of coloring the inside of the rectangular area is used as a mask image. . For example, FIG. 19 shows an example of specifying a rectangular area by specifying coordinates. If two vertices are specified, a rectangular area can be specified.
In the example of FIG. 19, the area specified by the vertex P1 that is the coordinates (X1, Y1) and the vertex P2 that is the coordinates (X2, Y2) is the drawing area 401. An area specified by the vertex P3 that is the coordinates (X3, Y3) and the vertex P4 that is the coordinates (X4, Y4) is the mask area 403. This mask area 40
It is also possible to obtain a mask image by adding a color to 3.

(3) Change of Hardware Used FIG. 1 is an example, and various changes can be made. The provision of the communication interface 115 is optional. Since the present invention is not directly related to sound processing, it is not necessary to provide the sound processing unit 109.

The CD-ROM is an example of a recording medium, and includes an internal memory such as a ROM, a CD-ROM, a DV
Other recording media such as a D-ROM, a memory cartridge, a floppy (registered trademark) disk, a magnetic disk, and a DVD-RAM may be used. In that case, the CD-ROM drive 113 needs to be a drive that can be read by a corresponding medium.

Further, the above is the case where the present invention is implemented by a computer program.
It is also possible to implement by combining a program and a dedicated device such as an electronic circuit, or by only a dedicated device such as an electronic circuit.

Although the present invention has been specifically described based on the embodiments, the present invention is not limited to the above embodiments. It can be changed as appropriate without departing from the gist. For example, in the above embodiment, a case has been described in which the present invention is implemented using a home game machine as a platform. However, the present invention may be implemented using an ordinary computer, an arcade game machine, or the like as a platform.
It is also conceivable to use a portable information terminal, a car navigation system, or the like as a platform.

Further, the programs and data for realizing the present invention are not limited to the form provided by a recording medium such as a CD-ROM which is detachable from a computer or a game machine. That is, programs and data for implementing the present invention are transferred to the communication interface 11 shown in FIG.
5. Network 1 connected via communication line 141
The program and data are recorded in a memory of another device on the device 51, and are sequentially stored in the RAM as needed through the communication line 141.
It may be a form that is stored in the storage unit 105 and used.

(Display Example) First, an image example of the first embodiment will be shown. FIG. 20 shows a perspective-transformed two-dimensional image 3001 to be faded out. Two-dimensional image 3001
Contains characters of male and female dancing. FIG.
1 shows a mask image 3003. Mask image 3
003 is entirely black. FIG. 22 shows the fade-in image 3
005 is shown. In the fade-in image 3005, white Fin characters are embedded on a black background.

For example, when the αa value is set to 0.5 and α blending is performed on the two-dimensional image 3001 in FIG. 20 and the mask image 3003 in FIG. 21, a first composite image 3007 as shown in FIG. 23 is obtained. The first composite image 3007 is affected by the black color of the mask image 3003, and is entirely shown in FIG.
It is darker than 0.

Next, assuming that the αb value is 0.5, the first value shown in FIG.
Composite image 3007 and the fade-in image 300 of FIG.
When α blending is performed on the image No. 5 and the image No. 5, a second composite image 3009 as shown in FIG. 24 is obtained. Second composite image 3
Since the background of the fade-in image 3005 is black in the base part 3009a of 009, the first composite image 3007
The color is darker than that of the base part. The white Fin characters in the fade-in image 3005 are slightly darkened by being influenced by the background of the first composite image 3007.

This second composite image 3009 (FIG. 24) is an image displayed on the display screen 120. If the αa and αb values are changed from 1.0 to 0.0, respectively, as a result, the two-dimensional image 3001 gradually changes to the fade-in image 3005. The process of change consists of αa value and αb
It can be adjusted by controlling the time change of the value.

That is, at time 0.0 seconds, the two-dimensional image 3001 in FIG. Time 2.
If the αa and αb values become 0.5 at 0 second, the second composite image 3009 of FIG. 24 is displayed on the display screen 120. At the end of the cross fade period of 4.0 seconds, the αa and αb values become 0.0, and the fade-in image 3005 of FIG.

For reference, see, for example, JP-A-10-29593.
When the two-dimensional image 3001 and the fade-in image 3005 are combined in a complementary manner as described in Japanese Patent Publication No. 4 (Kokai) No. 4 (Kokai) No. 4 (1993) -200, a complementary combined image 4001 in FIG. The complementary composite image 4001 has a brighter background than the second composite image 3009 in FIG. 24, but Fin characters are raised.

Next, an image example of the second embodiment will be shown. FIG.
, A perspective transformed two-dimensional image 3001, a mask image 3003 in FIG. 21, and a fade-in image 3005 in FIG.
Use

By performing α blending of the two-dimensional image 3001 and the mask image 3003 with the α value distribution shown in FIG. 16 as the αa value distribution, a first composite image 3011 shown in FIG. 25 is obtained. In the first composite image 3011 of FIG. 25, since the αa value is 0 at the upper left of the image, a part of the mask image 3003 appears at the upper left of the image. Since the αa value gradually increases from the upper left of the image to the lower right of the image, the black generated from the mask image 3003 gradually decreases. On the other hand, the two-dimensional image 3001 gradually appears because the αa value has a higher value from the upper left to the lower right of the image. Therefore, the lower right of the image is bright.

For the first composite image 3011 and the fade-in image 3005, the distribution of α values shown in FIG.
If α blending is performed as the value distribution, a second composite image 3013 shown in FIG. 26 is obtained. Second composite image 30
In FIG. 13, since the αb value is 0 at the upper left of the image, a part of the fade-in image 3005 appears at the upper left of the image. In particular, a white END character embedded in the fade-in image 3005 has a character portion 3013 while the αb value is low.
It is drawn in gray on a. However, the character portion 3013a is
When the lower right part of the image shifts to a portion having a higher αb value, the first composite image 3011 appears strongly, so that the first composite image 3011 is likely to melt into the base and disappear. In the lower right part of the image, an image darker than the lower right part of the first composite image 3011 in FIG. 25 is seen.

[0134]

As described above, according to the present invention, two-stage synthesis using a mask image is performed. Therefore, it is possible to individually set the brightness of the fade-in image and the brightness of the fade-out image at the time of synthesis.

[Brief description of the drawings]

FIG. 1 is a block diagram of a home game machine.

FIG. 2 shows an RA running a game program according to the present invention.
It is a schematic diagram which shows the state of M.

FIG. 3 is a diagram illustrating an example of a crossfade setting table.

FIG. 4 is a graph showing an example of a temporal change of αa and αb values.

FIG. 5 is an image example for explaining the operation principle of the first and second embodiments, and shows a perspective-transformed two-dimensional image.

FIG. 6 is an image example for explaining the operation principle of the first and second embodiments, showing a mask image.

FIG. 7 is an image example for explaining the operation principle of Embodiments 1 and 2, showing a fade-in image.

FIG. 8 is an image example for explaining the operation principle of the first embodiment, showing a first synthesized image.

FIG. 9 is an image example for explaining the operation principle of the first embodiment, showing a second synthesized image.

FIG. 10 is a flowchart showing a main flow of a display process in the present invention (Embodiments 1 and 2).

FIG. 11 is a flowchart of a crossfade process according to the first embodiment.

FIG. 12 is a graph showing an example of a temporal change in αa and αb values.

FIG. 13 is a schematic diagram illustrating an example of the distribution of αa and αb values.

FIG. 14 is an image example for explaining the operation principle of the second embodiment, and is a first composite image.

FIG. 15 is an image example for explaining the operation principle of the second embodiment, and is a second composite image.

FIG. 16 is a schematic diagram showing an example of a distribution of αa and αb values.

17 is a graph showing an example of a time variation of .alpha.a ₀ to .alpha.a ₃ and .alpha.b ₀ to .alpha.b _3.

FIG. 18 is a flowchart of a crossfade process according to the second embodiment.

FIG. 19 is a schematic diagram for explaining a mask area specified by a rectangular area.

FIG. 20 is an example of a perspective-transformed two-dimensional image.

FIG. 21 is an example of a mask image.

FIG. 22 is an example of a fade-in image.

FIG. 23 shows an α value of 0.5 between the image of FIG. 20 and the image of FIG. 21;
5 is a first synthesized image obtained by performing α blending on the first composite image.

FIG. 24 shows an example in which the image shown in FIG. 23 and the image shown in FIG.
5 is a second composite image obtained by performing α blending on the second composite image. It is an image displayed on a display screen.

FIG. 25 is a first composite image obtained by subjecting the image of FIG. 20 and the image of FIG. 21 to α blending with an α value distribution as shown in FIG. 16;

26 is a second composite image obtained by subjecting the image of FIG. 25 and the image of FIG. 22 to α blending with an α value distribution as shown in FIG. 16;

FIG. 27 is a complementary composite image obtained when the image of FIG. 20 and the image of FIG. 22 are composited complementarily.

[Explanation of symbols]

101 home game machine 103 CPU 104
ROM 105 RAM 107 HDD 109 Sound processing unit 112 Frame buffer 111 Graphics processing unit 113 CD-ROM drive 115 Communication interface 117 Interface unit 119 Internal bus
121 TV set 120 Display screen 131 CD-ROM 141
Communication media 151 Network 161 Keypad 17
1 memory card 1051 program area 1053 related data storage area 1055 crossfade setting table 1057
Work area 1059 Mask image 1065 Fade-in image

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2C001 BA00 BA06 BB00 BB04 BC00 BC06 BC10 CB01 CB02 CB03 CB06 CC02 CC08 5B050 AA10 BA06 EA09 EA19 EA24 EA27 EA30 5C023 AA12 AA16 AA34 AA38 BA11 CA03 DA04 CA08 EA01 GB03 KE02 KE09 KE17 LA02 9A001 HH23 JJ76 KK45

Claims (14)

[Claims] 1. A computer-readable recording medium on which a video game program is recorded. The computer-readable recording medium stores a game image sequentially generated by a perspective transformation after an arbitrary timing in a progress process of the video game. An image for adjustment for adjusting the color of the game image is a first image whose value is changed according to the elapsed time from the timing.
A first step of sequentially obtaining a first synthesized image by synthesizing according to the synthesizing ratio, and a fade-in image to be cross-fade with the first synthesized image sequentially obtained in the first step and the first synthesized image Are synthesized according to a second synthesis ratio whose value changes according to the elapsed time from the timing,
A second step of sequentially acquiring the combined images of the above, and a third step of displaying the second combined images sequentially acquired in the second step, and a computer-readable program recorded thereon. Recording medium. 2. The method according to claim 1, further comprising: obtaining the second composite image.
Displaying the first combined image sequentially acquired in the first step and a fade-in image to be cross-fade with the first combined image for only a predetermined time from the timing and displaying the first combined image only The method according to claim 2, wherein the values are held and the values are changed in accordance with the elapsed time after the predetermined time, and the values are changed according to a second synthesis ratio, and a second synthesized image is sequentially acquired. 2. The computer readable computer recording medium according to claim 1. 3. The method according to claim 1, wherein the first composite image is acquired.
The step includes, after an arbitrary timing in the progress of the video game, a game image sequentially generated by perspective transformation and an adjustment image for adjusting the color of the game image according to an elapsed time from the timing. The pixel is synthesized in accordance with the first synthesis ratio for each pixel whose value is changed,
2. The computer-readable recording medium according to claim 1, further comprising a step of sequentially acquiring the composite images of 4. The method according to claim 1, further comprising the step of obtaining the first composite image.
2. The computer-readable recording medium according to claim 1, wherein the step includes a step of obtaining the adjustment image by drawing one or a plurality of polygons prepared in advance. 5. The method according to claim 1, further comprising the step of obtaining the first composite image.
2. The computer-readable recording medium according to claim 1, wherein the step includes acquiring the adjustment image by drawing an area determined by coordinate designation with a predetermined color scheme. 6. The method according to claim 1, wherein the first composite image is obtained.
By interpolating a first combination ratio set for a plurality of pixels at a predetermined position in a region corresponding to the adjustment image,
4. The computer-readable recording medium according to claim 3, further comprising a step of calculating a first combination ratio for each pixel. 7. A cross-fade processing method in a video game, comprising: a game image sequentially generated by perspective transformation after an arbitrary timing in the progress of the video game; and an adjustment method for adjusting a color of the game image. A first image whose value is changed according to an elapsed time from the timing.
A first step of sequentially obtaining a first synthesized image by synthesizing according to the synthesizing ratio, and a fade-in image to be cross-fade with the first synthesized image sequentially obtained in the first step and the first synthesized image Are synthesized in accordance with a second synthesis ratio in which the value is changed according to the elapsed time from the timing, and a second synthesized image is sequentially obtained. A third step of displaying the two composite images. 2. A crossfade processing method, comprising: 8. The method according to claim 1, wherein the second step of acquiring the second composite image includes: the first composite image sequentially acquired in the first step; and a fade-in image to be cross-fade with the first composite image. Are synthesized according to a second synthesis ratio in which a value is displayed such that only the first synthesized image is displayed for a predetermined time from the timing, and the value is changed according to the elapsed time after the predetermined time. 8. The crossfade processing method according to claim 7, further comprising the step of sequentially acquiring the combined images of 9. The method according to claim 1, wherein the first step of acquiring the first composite image includes adjusting a game image sequentially generated by perspective transformation and a color of the game image after an arbitrary timing in the progress of the video game. And synthesizing an image for adjustment for each pixel in accordance with a first synthesis ratio for each pixel, the value of which is changed according to the elapsed time from the timing, and sequentially obtaining a first synthesized image. 8. The crossfade processing method according to claim 7, wherein: 10. The method according to claim 1, further comprising: obtaining the first composite image.
8. The crossfade processing method according to claim 7, wherein the step includes a step of obtaining the adjustment image by drawing one or a plurality of polygons prepared in advance. 11. The method according to claim 1, further comprising: obtaining the first composite image.
8. The crossfade processing method according to claim 7, wherein the step includes a step of obtaining the adjustment image by drawing an area determined by the coordinate designation with a predetermined color scheme. 12. The method according to claim 1, wherein the first synthesizing image is acquired.
The step of calculating a first combination ratio for each pixel by interpolating a first combination ratio set for a plurality of pixels at a predetermined position in an area corresponding to the adjustment image. The crossfade processing method according to claim 9, wherein: 13. A game image sequentially generated by perspective transformation and an adjustment image for adjusting the color of the game image after an arbitrary timing in the progress of the video game, according to an elapsed time from the timing. A first combined image acquiring unit that combines the first combined image according to a first combination ratio whose value is changed, and the first combined image that is sequentially acquired by the first combined image acquiring unit And a fade-in image to be cross-fade with the first combined image according to a second combining ratio in which a value changes according to an elapsed time from the timing, and a second combined image is sequentially acquired. 2. A video game device comprising: a composite image acquisition unit; and a display unit that displays a second composite image sequentially acquired by the second composite image acquisition unit. . 14. A computer, and a computer-readable recording medium having recorded thereon a program to be executed by the computer, wherein the program causes the computer to execute perspective transformation after an arbitrary timing in the progress of a video game. And the adjustment image for adjusting the color of the game image sequentially generated according to the first synthesis ratio whose value is changed according to the elapsed time from the timing. A first combined image acquisition process for sequentially acquiring a combined image; and a first combined image sequentially acquired in the first combined image acquisition process and a fade-in image that is cross-fade with the first combined image. Compositing is performed in accordance with a second compositing ratio, the value of which is changed according to the elapsed time from the timing, and the second composite image is sequentially arranged. A second synthesized image acquisition process of acquiring a second sequentially acquired in the second synthesized image acquisition processing
A video game device, characterized by executing a display process of displaying a composite image of (i) and (ii).