JP3447670B2 - Image processing apparatus and image processing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus and an image processing method, and more particularly to an image processing apparatus and an image processing method capable of executing arbitrary semi-transparent processing in pixel units without increasing the circuit scale. .

[0002]

2. Description of the Related Art Recently, the technique of graphic processing using an image processing device has made remarkable progress, and various displays can be performed on the screen. For example, when a plurality of figures having depth information are overlapped and displayed on a display device, color data of pixels forming a figure located in the rear and color data of pixels forming a figure located in the front are mixed. However, by displaying the color data generated by mixing on a display device, an image positioned in front is given a sense of transparency.

The prior art of the image processing apparatus as described above is described in Japanese Patent Application Laid-Open No. 11-156023. The image processing apparatus described in this publication will be described with reference to FIG.
An image control CPU 91 processes an instruction for displaying an image on the color image display device 98 according to an image control signal S1 transmitted from the main CPU, and outputs the processing result to various registers 92 and a color palette 95. is there.

The reading means 93 supplies a read address to the CG memory 94 in accordance with the priority order data stored in the priority specifying means 92A constituting the various registers 92, and the color code data read from the CG memory 94 is Supplied to color palette 95, color palette 95
To output R, G, B color data.

[0007] The priority order data defines the order of overwriting in order from the image with the lowest priority to the image with the highest priority, and the image with the highest priority is displayed as the image in the foreground.

The semi-transparent processing means 96 includes a color palette 9
The R, G, and B color data read from No. 5 is subjected to a semi-transparent process, and this process is performed in pixel units. More specifically, when the translucent process is executed, the display memory 9
The pixel data of the image on the far side already written in 7 is read, and the color palette 95 is read for this pixel data.
The color data supplied from the above are mixed at a fixed ratio, and the pixel data generated by the mixing is written in the display memory 97 again.

The display memory 97 has two field memories, one of which is the semitransparent processing means 9
The pixel data output from 6 is written, the pixel data is read from the other field memory, and output to the color image display device 98.

FIG. 10 shows the data structure of the color palette 95. R, which constitutes each pixel data of a graphic,
It is composed of color information of 5 bits for each of G and B and 1 bit of a semi-transparent flag indicating whether or not to perform the semi-transparent process, for a total of 16 bits. If the semi-transparent flag is active, semi-transparent processing is performed, and if the semi-transparent flag is inactive, opaque processing is performed. In this way, the semi-transparent or opaque process is performed in pixel units.

[0009]

Since the conventional image processing apparatus described above requires a memory area for setting a semitransparent flag in a color palette 95 composed of a RAM, as shown in FIG. There is a problem that the memory area increases.

Further, the memory structure of the color palette 95 becomes complicated, the control signal of the image control CPU for controlling the color palette 95 becomes complicated, and the access speed to the color palette 95 decreases.

Therefore, the object of the present invention is not to provide special information regarding semitransparency such as a semitransparent flag in the color palette, but to determine whether it is semitransparent pixel data or opaque pixel data depending on the area of the color palette. by doing,
An object of the present invention is to provide an image processing device and an image processing method capable of performing translucent processing in pixel units without increasing the memory area of the color palette.

Another object of the present invention is to provide an image processing apparatus and an image processing method which can simplify the structure of a color palette and control the color palette at high speed.

Still another object of the present invention is to provide an image processing apparatus and an image processing method capable of setting various translucent register values in a translucent setting register and executing various translucent processes. To provide.

Another object of the present invention is to set an arbitrary translucency for each pixel in a translucency register, refer to this translucency information, and display the color data output from the color palette and the display. An object of the present invention is to provide an image processing device and an image processing method capable of generating pixel data at an arbitrary translucency rate by mixing with pixel data read from a memory.

[0015]

Therefore, the image processing apparatus according to the present invention is an image processing apparatus for performing a predetermined image processing on the graphic data read from the CG memory storing a plurality of graphic data and displaying the graphic data. A color palette that stores the color data corresponding to a palette value that is output from the CG memory and that constitutes the graphic data and that specifies color data that is color information of the pixel data. , A comparator that determines the size of the palette value output from the CG memory and a predetermined semi-transparent register value and outputs a semi-transparent signal that is a determination signal, and a portion where the plurality of graphic data overlap,
A semi-transparent processing unit that generates a color by mixing the color data of each of the plurality of graphic data at a ratio determined by the semi-transparent signal to obtain a display color.

Further, the image processing method according to the present invention is an image processing method for performing a predetermined image processing on the graphic data read from the CG memory in which a plurality of graphic data is stored and displaying the graphic data. For each pixel data forming the graphic data, a first step of outputting a palette value designating color data which is the color information of the pixel data; the palette value output from the CG memory; A second step of determining the size of the semitransparent register value and outputting a semitransparent signal which is a determination signal;
The third step of reading the color data from the color palette storing the color data, and the color data for each of the plurality of graphic data at a ratio determined by the semitransparent signal in the overlapping portion of the plurality of graphic data. A fourth step of performing a semi-transparent process for generating a mixed color to be a display color.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an image processing apparatus of the present invention. The conventional image processing apparatus shown in FIG. 9 is provided with a semi-transparent setting register 19 and a comparator 20 shown by a thick frame, and a color palette 15 is also provided. The data structure of is different from that of the color palette 95 of FIG. 9 as described later.

The image processing apparatus of the present invention inputs an image control signal S1 for displaying an image, processes an instruction for displaying the image, and outputs the processing result as parameter setting means 12, color palette 15, Semi-transparent setting register 19,
Parameter setting for storing the image control CPU 11 stored in the display memory 17 and the processing result of the image control CPU 11 and storing the priority data indicating the drawing priority of the graphic when the graphic forming the image is drawn. Means 1
2 and read-out means 13 for reading out information of a figure to be drawn from the parameter setting means 12 and supplying a read-out address signal to the CG memory 14.

The image processing apparatus of the present invention stores image data such as figures and characters, and outputs a pallet value corresponding to the image data in response to a read address signal. , B, Y, U, V
A color palette 15 for storing color data such as the above, a semi-transparent processing means 16 for performing a semi-transparent process or an opaque process for a graphic specified by priority data, and two field memories. A display memory 17 that outputs pixel data to the display device 18 and stores the pixel data output from the semitransparent processing means 16 to the other field memory, and a CRT, a liquid crystal display device, a plasma display, or the like for displaying a color image. And a color image display device 18.

Further, the image processing apparatus of the present invention stores, for the color data stored in the color palette 15, a translucent register value for designating whether the color data is translucent or opaque. Semi-transparent setting register 19
And a comparator 20 which compares the semitransparent register value with the palette value output from the CG memory 14 and outputs a semitransparent signal which is a determination result to the semitransparent processing means 16.

Next, an image processing method using the image processing apparatus of the present invention shown in FIG. 1 will be described with reference to FIGS.

In step S11 of FIG. 2, the CP for image control is used.
U11 sets various parameters. That is, various register values such as translucency and priority data are set in the parameter setting means 12, and color data such as R, G, B and Y, U, V are set in the color palette 15. A semi-transparent register value for designating whether the color data is semi-transparent or opaque is set in the semi-transparent setting register 19, and initial display image data representing initial conditions of the display image is stored in the display memory 17. Set.

Next, the reading means 13 has a step S12.
In step S1, various parameters relating to the graphic stored in the parameter setting means 12 are read out, and then in step S
13, referring to these parameters, the CG memory 1
A read address signal for 4 is generated.

Subsequently, in step S14, the CG memory 14 sequentially supplies the palette value corresponding to the read address signal generated in step S13 to the color palette 15.
To the comparator 20.

Next, the processing of the comparator 20 in step S15 and the processing of the color palette 15 in step S16 are executed in parallel. That is, in step S15, the comparator 20 compares the semi-transparent register value output from the semi-transparent setting register 19 with the palette value output from the CG memory, and outputs the color palette 15 corresponding to the palette value. A semitransparent signal, which is a determination signal for performing semitransparent processing or opaque processing on the color data to be processed, is output.

There are several methods for performing semi-transparent processing or opaque processing for the color data corresponding to the palette value depending on the magnitude relationship between the semi-transparent register value and the palette value. The first method will be described with reference to the color palette 15 shown in FIG. Semi-transparent register value r
The memory area indicated by the shaded area having a palette value larger than the palette value m1 of the color palette 15 corresponding to 1 (not shown) is set as the semitransparent setting area. Therefore,
The semi-transparent process is performed on the color data in the semi-transparent setting area shown by the hatched portion in FIG.

FIG. 4 is a second diagram showing whether the color data corresponding to the palette value is subjected to the semi-transparent processing or the opaque processing according to the magnitude relation between the semi-transparent register value and the palette value.
FIG. 4 is a diagram for explaining the method of using the color palette 15, and conversely to FIG. 3, a memory area indicated by a shaded area having a palette value smaller than the palette value m2 of the color palette 15 corresponding to the semitransparent register value r2 is It is set as a semi-transparent setting area, and the semi-transparent processing is performed on the color data in the semi-transparent setting area.

Further, FIG. 5 shows a third method for performing semi-transparent processing or opaque processing of the color data corresponding to the palette value according to the magnitude relationship between the semi-transparent register value and the palette value. FIG. 6 is a diagram to be described using the color palette 1 in which a semi-transparency T1 and a corresponding semi-transparent register value t1 are set in the memory area 51 corresponding to palette values 0 to m3 of the color palette 15.
The translucency T2 and the corresponding translucent register value t2 are set for the memory area 51 corresponding to the palette values (m3 + 1) to m4 of 5, and the translucency different for the plurality of translucent setting areas is similarly set. Are set in order, and the semi-transparency Tm is set for the memory area 5m5 corresponding to the palette value of m5 to n.
5 and the corresponding semi-transparent register value tm5 are set.

That is, in the case of FIG. 5, a plurality of translucent register values can be set in the translucent setting register 19 so that various translucent processing can be executed.

In the above, the translucency T1, T2, Tm
5 is set in the parameter setting means 12, and step S
When performing the semitransparent treatment in 17, the semitransparent treatment means 1
6 is read.

The semi-transparent register values t1, t2, tm5
Are stored in the semi-transparent setting register 19.

The processing of step S16 is the same as step S1.
5, the color data of R, G, B, etc. is output from the color palette 15 to the semitransparent processing means 16.

Next, in step S15, when the comparator 20 determines that the color data to be processed is the color data for which the semitransparent processing is performed, the comparator 20 sends the semitransparent signal which is the determination signal to the semitransparent processing means 16. Output,
In step S17, the semi-transparent processing means 16 has the same address as the address when the color data currently processed is stored in the display memory 17, and displays the display data which is the color data already stored in the display memory 17. The read-out display data and the read-out display data and the color data read out from the color palette 15 in step S16 are combined to perform a semi-transparent process. Here, as the semi-transparent processing, a generally widely used method such as alpha blending is used.

If the comparator 20 determines in step S15 that the color data to be processed is the color data for opaque processing, the comparator 20 outputs this determination signal to the semitransparent processing means 16, and in step S18 the semitransparent processing means 16 outputs the determination signal. The transparency processing means 16 outputs the color data read from the color palette 15 in the step S16 to the memory area of the corresponding address of the display memory as it is, and overwrites the color data in this memory area in the step S19 to perform the opacity processing. .

Next, in step S19, step S
17 or the color data processed in step S18 is stored in the corresponding address of the display memory 17.

Thus, steps S12 to S19
The processes up to are executed for all pixel data forming the figure.

When the processing from step S12 to step S19 is completed for all pixel data forming the figure, in step S20, step S12 to
It is determined whether the graphic processed in step S19 is the last graphic forming the screen, that is, whether there is an unprocessed graphic that has not been processed in steps S12 to S19.

If it is determined in step S20 that there is an unprocessed figure, the next figure to be processed is searched for in step S22, and the steps S12 to S19 are performed on this figure.

In this way, the above-mentioned processing is performed for all figures forming the screen.

Next, in step S21, the display data stored in the display memory is transferred to the color image display device 18.
Output to and display the screen. After that, the process returns to step S11 and the same process is repeated to display images one after another on the color image display device 18.

As described above, in the image processing apparatus and the image processing method according to the present invention, it is determined by the area of the color palette, that is, for each pixel data corresponding to the palette value, whether the data is translucent or opaque. Because
It is possible to perform the semi-transparency processing in pixel units without increasing the memory area of the color palette.

Since the structure of the color palette is simple,
It is possible to control the color palette at high speed.

In the above processing flow, as a figure, not only character data composed of polygon data such as polygons which are often used at present but also an image composed of bitmap data (bmp data) can be used. The invention is likewise applicable.

Next, a second embodiment of the image processing apparatus and the image processing method of the present invention will be described with reference to FIGS.

FIG. 6 is a block diagram showing a second embodiment of the image processing apparatus of the present invention, in which a translucency register 21 is added to the image processing apparatus shown in FIG. The image control CPU 11 sets an arbitrary translucency for each pixel in the translucency register 21, and the translucent processing means 16 inputs a translucent signal indicating that the pixel to be processed is translucent from the comparator 20. In this case, referring to the information on the translucency set in the translucency register 21, the palette value output from the color palette 15 and the pixel data read out from the display memory 17 are mixed, and any value is selected. Pixel data is generated with a translucency of.

Next, an image processing method using the image processing apparatus according to the second embodiment of the present invention will be described with reference to the processing flow shown in FIG. The processing flow of FIG. 7 is basically the same as the processing method of the first embodiment of the image processing apparatus of the present invention shown in FIG. 2, but as shown by the thick frame, the translucency register in step S111. If the image control CPU 11 sets an arbitrary semi-transparency in 21 and the comparator 20 outputs a semi-transparent signal indicating that the color data to be processed is semi-transparent, step S1 is performed.
At 71, the translucency processing unit 16 refers to the translucency information set in the translucency register 21 and compares the color data output from the color palette 15 and the display data read from the display memory 17. It is different from the processing method of the first embodiment of the image processing apparatus of the present invention in that the pixel data which becomes the display data with an arbitrary translucency is mixed and generated.

FIG. 8 shows how the translucency is set for the color palette 15 shown in FIG. 6, and for the memory area from the palette value m1 to the palette value n shown by the shaded area. It indicates that an arbitrary translucency rate is set.

[0049]

As described above, according to the image processing apparatus and the image processing method of the present invention, depending on the area of the color palette, that is, for each pixel data corresponding to the palette value, a semitransparent color data or an opaque color data is used. Since it is judged whether it is data, without increasing the memory area of the color palette,
Semi-transparent processing can be performed in pixel units.

Comparing the image processing apparatus of the present invention shown in FIG. 1 with the conventional image processing apparatus shown in FIG. 9, the semitransparent setting register 19 and the comparator 20 are increased in the present invention. Since the circuit scale of the color palette 15 is smaller than that of the color palette 95, the circuit scale of the image processing apparatus of the present invention is smaller than that of the color palette 95.

Further, in the image processing apparatus and the image processing method according to the present invention, since the structure of the color palette is simple, it is possible to control the color palette at high speed.

Furthermore, various translucent processes can be executed by setting a plurality of translucent register values in the translucent setting register.

Further, an arbitrary translucency rate is set for each pixel in the translucency rate register, the information of this translucency rate is referred to, and the color data output from the color palette and the display data read from the display memory are set. It is possible to generate pixel data to be display data with arbitrary translucency by mixing and.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of an image processing apparatus of the present invention.

FIG. 2 is a flowchart for explaining an image processing method using the image processing apparatus according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram for describing a first embodiment in which a semi-transparent setting is performed for each color data that makes up the color palette 15 of FIG.

FIG. 4 is an explanatory diagram for explaining a second embodiment in which a semi-transparent setting is performed for each color data that makes up the color palette 15 of FIG.

FIG. 5 is an explanatory diagram for explaining a third embodiment in which semi-transparent setting is performed for each color data forming the color palette 15 in FIG.

FIG. 6 is a block diagram showing a second embodiment of the image processing apparatus of the invention.

FIG. 7 is a flowchart for explaining an image processing method using the image processing device according to the second embodiment of the present invention.

8 is an explanatory diagram for explaining an embodiment in which semi-transparent setting is performed for each color data that constitutes the color palette 15 in FIG.

FIG. 9 is a block diagram showing a conventional image processing apparatus.

10 is a diagram for explaining a data structure of a color palette 95 in FIG.

[Explanation of symbols]

11,91 Image control CPU 12 Parameter setting means 13,93 Read-out means 14,94 CG memory 15,95 color palette 16,96 Semi-transparent processing means 17,97 Display memory 18,98 Color image display device 19 Semi-transparent setting register 20 comparator 21 Translucency Register 92 Various registers 92A priority designation means

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI H04N 1/46 H04N 1/40 D 1/60 1/46 Z (56) References JP-A-11-156023 (JP, A) JP-A-6-102847 (JP, A) JP-A-63-85596 (JP, A) JP-A-2000-278515 (JP, A) JP-A-8-16152 (JP, A) (58) Fields investigated ( Int.Cl. ⁷ , DB name) G09G 5/00-5/42 G06F 3/14

Claims (7)

(57) [Claims] 1. An image processing apparatus for displaying the graphic data read from a CG memory storing a plurality of graphic data by performing predetermined image processing, the graphic data being output from the CG memory to form the graphic data. A color palette for storing the color data, a palette value output from the CG memory, a predetermined palette value corresponding to a palette value designating color data, which is color information of the pixel data, for each pixel data Of the semi-transparent register value of, and a comparator for outputting a semi-transparent signal which is a determination signal, and the color data of each of the plurality of graphic data in the overlapping portion of the plurality of graphic data, An image processing apparatus, comprising: a semi-transparent processing unit that generates a mixed color at a ratio determined by a transparent signal to generate a display color. 2. A parameter setting means for setting a priority indicating a priority when displaying the graphic data for each of the graphic data, wherein the semi-transparent processing means includes a first signal and a second signal. In response to the first signal of the semi-transparent signal composed of:
A semi-transparent process is performed to generate a color in which the color data of each of the plurality of graphic data is mixed at an arbitrary ratio, and in response to the second signal, the priority order is set in the overlapping portion of the plurality of graphic data. The image processing apparatus according to claim 1, wherein opacity processing is performed to generate the color data of the graphic data having a high degree as a display color. 3. A display memory for storing the color data processed by the translucent processing means, a color image display device for inputting the color data stored in the display memory and displaying the color data. The image processing apparatus according to claim 1, further comprising: 4. A plurality of the translucent register values are stored in a translucent setting register, and the translucent processing means refers to translucent rates corresponding to the plurality of translucent register values to refer to a plurality of the graphic data. 2. The image processing apparatus according to claim 1, wherein the display color is generated by generating a color in which the color data of each of the plurality of graphic data is mixed at a ratio determined by the translucency in the overlapping portion of. 5. A translucency register which sets a translucency for each pixel data, wherein the translucency processing means stores the color data for each of the plurality of graphic data in an overlapping portion of the plurality of graphic data. The image processing apparatus according to claim 1, wherein the display color is generated by generating a mixed color at a ratio determined by the translucency stored in the translucency register. 6. An image processing method for performing predetermined image processing on the graphic data read from a CG memory storing a plurality of graphic data and displaying the graphic data, the pixels constituting the graphic data from the CG memory. A first step of outputting, for each data, a palette value designating color data that is the color information of the pixel data; a size of the palette value output from the CG memory and a predetermined semi-transparent register value. In the overlapping portion of the plurality of graphic data, the second step of determining the depth and outputting a semi-transparent signal as a determination signal, the third step of reading the color data from the color palette storing the color data, A semi-transparent processing for generating a color by mixing the color data of each of the plurality of graphic data at a ratio determined by the semi-transparent signal to obtain a display color. An image processing method comprising a fourth step, the performing. 7. A fifth step of storing the display color generated in the fourth step in a display memory, inputting the display color stored in the display memory, and displaying the display color in a color image. The image processing method according to claim 6, further comprising a sixth step of displaying on a device.