JP3306060B2 - Image data processing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image data processing device, and more particularly to an image data processing device using a bitmap method.

[Summary of the Invention]

The present invention relates to image data processing for dividing one screen into predetermined pixels, storing data of each divided screen from a predetermined image data recording medium in a memory, and performing processing for displaying an image on predetermined display means. In the device, of the divided screen data, the divided screen data commonly used for each image is stored first in the memory, and the other divided screen data is sequentially read from the image data recording medium and stored in the memory. It is intended to be.

[Conventional technology]

2. Description of the Related Art Conventionally, when various image data such as video signals are stored in a memory, for example, data such as color is added to each pixel constituting one screen to make digital data, and data of all pixels for one screen is stored in a memory. Was remembered. The data obtained by decomposing the data into pixels constituting one screen in this manner is referred to as bitmap image data.

[Problems to be solved by the invention]

By the way, in the case of such bitmap type image data, data such as colors is required for every pixel constituting one screen, and the amount of data for one screen is large. As a result, the amount of data handled by the processing circuit for processing increases, and there is a disadvantage that the load on the processing circuit is large.
That is, in a processing circuit for processing image data for display or the like, the image data is read out from a recording medium such as a disk or a tape on which the image data is recorded and temporarily stored in a RAM in the processing circuit.
Although the processing for converting into a video signal for display or the like is performed, a large-capacity RAM is required in the processing circuit, and the circuit scale becomes large.

In view of the above, an object of the present invention is to simplify a circuit that processes bitmap image data.

[Means for solving the problem]

In order to solve the above problem, the present invention provides an image data processing device that stores image data read from a recording medium in a memory, and displays an image represented by the image data on a display device, When the images are continuously displayed, the image data of the common partial image common to the plurality of continuously displayed images is read out from the storage medium and stored in the memory, and the display screen is displayed. Each time the image displayed on the display device is switched, image data of a new partial image that constitutes an image to be displayed next on the display device together with image data of the common partial image stored in the memory is stored in the storage medium. There is provided an image data processing device comprising means for reading and storing the read data in the memory.

[Action]

By doing so, the memory for signal processing
It is not necessary to sequentially store the divided screens commonly used for each image every time the displayed image changes, and accordingly, the amount of data handled by the memory is reduced and the load on the circuit is reduced.

〔Example〕

Hereinafter, an embodiment of an image data processing apparatus according to the present invention will be described with reference to the accompanying drawings.

In this example, a video signal of a still image is converted into bitmap image data using a palette. First, bitmap image data using the palette will be described. The bitmap image data divides a video signal of a single still image into a plurality of sections. For example, as shown in FIG. 2, one pixel is composed of 256 pixels in the horizontal direction × 192 pixels in the vertical direction. Screen video signal,
It is divided into 8 pixel x 8 pixel sections of 64 pixels,
It is divided into 768 sections of 24 × vertical sections. In this case, in the following description, each section is defined as one character.

Then, usable color data is set for each character, and in this example, palette data is provided as the color data. This pallet data is 8 for each still image.
Each type of palette data stores R, G, and B coloration data of 16 types of colors, and color numbers from 1 to 16 are assigned to these 16 types of colors. Has been granted.

For each of the 768 characters constituting one screen, data (hereinafter referred to as screen data) indicating which of the eight types of pallet data to use is set, and the screen data is used by each character. The pallet to be used is determined.

In the character data in which the pixel data of each character is stored, data of a color number (any number from 1 to 16) is set for each pixel, and a color number of a palette corresponding to each character is set. , The color of each pixel is determined.

By using bitmap image data using pallet data in this way, 16 colors × 8 pallets = 128 colors for the entire screen, and 128 colors can be used at the maximum. In each pixel unit, only the color numbers from 1 to 16 need to be assigned, and the data amount of the entire screen can be greatly reduced.

Next, FIG. 1 shows a configuration for displaying bitmap type image data using the pallet data. In FIG. 1, (1) shows a central controller (CP) for controlling image display.
U), the CD ROM is controlled by the central control unit (1).
Predetermined image data is read from a disk (CD ROM) mounted on the device (2) and temporarily stored in the RAMs (3), (4), and (5). In this case, in this example, the RAM (3),
As (4) and (5), one set of memory is divided into a first area, a second area and a third area, and each area is used as RAM (3), (4) and (5) I do. Then, eight types of pallet data are stored in an area used as a RAM (3), screen data indicating a pallet corresponding to each character is stored in an area used as a RAM (4), and the RAM is used as a RAM (5). Character data indicating color number data for each pixel in each character is stored in the used area.

FIG. 3 and FIG. 4 are views showing a storage device of the pallet data in the RAM (3), and this pallet data is stored.
The RAM (3) is called a color bank. As shown in FIG. 3, data of 16 colors of each pallet from the first pallet to the eighth pallet are stored in individual areas. As the 16 color data of each palette, as shown in FIG. 4, 16 color numbers are set with 4-bit data, and R (red), G (green), B (blue) level data is set with 5 bits.

FIG. 5 is a diagram showing the storage state of the screen data in the RAM (4). The character code assigned to each of the 768 characters is indicated by 10 bits, and the pallet number corresponding to each character code is shown. Can be set with 3 bits.

FIG. 6 is a view showing a storage device for character data in the RAM (5). FIG. 6 shows a storage area for one character, and one storage area is provided for each character. The dot number assigned to each 64 pixels is indicated by 6 bits, and 4
Bit color numbers can be set.

Then, under the control of the central control unit (1), the color number data is read out from the RAM (5) one pixel at a time to the image display unit (6), and the color number data is handled based on the screen data stored in the RAM (4). Pallet data in RAM (3)
, And coloring of each pixel is performed. And
When the pixel display unit (6) performs a coloring process on all the pixels for one screen, a horizontal synchronization signal, a vertical synchronization signal, and the like are added to the data for one screen to obtain a predetermined video signal. The signal is supplied to the monitor receiver (7) and displayed on the screen of the monitor receiver (7).

In this example, when this display is performed, image data for substantially two screens (actually, image data smaller than two screens as described later) is stored in the RAM (so as to be described later) so that images can be displayed continuously. 3), (4) and (5), a process of reading image data from the CD ROM device (2) and storing the image data in the RAMs (3), (4) and (5); The image data stored in (3), (4) and (5) is transmitted to the monitor receiver (7) via the image display unit (6).
And the processing to be displayed at the same time.
That is, the RAMs (3), (4), and (5) of this example are formed by dividing a set of memory areas, and as shown in FIG. 7, are formed as character banks (RAM (5)). It has an area used as a screen bank (RAM (4)) and an area used as a color bank (RAM (3)). The character bank for storing character data is divided into three parts: a character bank 1, a character bank 2, and a character data sharing area. The character bank 1 and the character bank 2 store predetermined character data, respectively, and store character data for one screen by being combined with the character data common area. That is, the area a, which is the combination of the character bank 1 and the character data sharing area, has a capacity capable of storing almost one screen of character data, and the area b, which is the combination of the character bank 2 and the character data sharing area, also has It has a capacity to store character data for almost one screen.

In this case, the character data shared area stores character data that is relatively frequently used. That is, for example, data when 64 pixels constituting one character are all the same color such as white and black, and data of a graphic unique to an animation formed by this image are stored. The frequently used character data differs depending on the image, and is set for each software including a plurality of pieces of image data. When reading the first image data of this software from the CD ROM, The central controller (1) controls so that the character is read out simultaneously with another character and stored in the character data sharing area. Then, data indicating which part of each image corresponds to the character data stored in the common area is added to the screen data of each image data, and the image data is determined by judging the screen data. A video signal for display is created in the display unit (6).

Here, control in the case where images are continuously displayed on the monitor receiver (7) using the RAMs (3), (4) and (5) will be described with reference to the flowchart of FIG.
First, when reading the first image data of the predetermined software from the CD ROM, the pallet data, screen data, and character data constituting the image data are read, and at the same time, the common character set in the software is read. The data is read out and transferred to and stored in the color bank 1, screen bank 1, character bank 1 and character data shared area, respectively (step 11).

When the transfer operation is completed, a video signal for display is created in the image display unit (6) based on the respective data, and the video signal is received by the monitor receiver (7). In this case, the character data lacking in the character data of the character bank 1 is supplemented by the character data stored in the common area, and character data for one screen is obtained.

While the first image is being displayed (received), the image data to be displayed next is read from the CD ROM at the same time. At this time, the pallet data, the screen data, and the character data constituting the second image data are read out and transferred to and stored in the color bank 2, the screen bank 2, and the character bank 2, respectively (step 12). At this time, new data is not transferred to the common area.

Then, when it is time to display the second image, a video signal for display is created in the image display unit (6) based on the data stored in each bank 2, and
The video signal is received by the monitor receiver (7).
Also in this case, the character data lacking in the character data of the character bank 2 is supplemented by the character data stored in the common area, and the character data for one screen is obtained.

When the second image is being displayed, the image data to be displayed next is read from the CD ROM at the same time. At this time, the pallet data, screen data, and character data constituting the next image data are read and transferred to and stored in the color bank 1, screen bank 1, and character bank 1, respectively (step 1).
3). At this time, new data is not transferred to the common area.

In this way, the RAM (3),
At the same time as displaying by the image data stored in one of the banks (4) and (5), the RAM (3), (4),
(5) The work of transferring the image data from the CD ROM to the other bank is alternately performed to smoothly switch the display image.

As described above, according to the image data processing of the present example, character data that is relatively frequently used is shared by each display image as bitmap image data, so that the entire data amount is reduced accordingly. RAM for temporarily storing image data to perform display processing
The capacity of (3), (4) and (5) can be reduced. In other words, the amount of data of software constituting animation and the like is reduced by the amount of data to be shared, and the capacity of the character bank can be reduced by the amount of the character data sharing area, thereby reducing the circuit scale of the memory.

In general, when displaying an animation or the like, there is a high correlation between continuously displayed images, there is a lot of character data that can be shared, and the image is switched only for data of a part of characters that are changed. It is sufficient to transfer the data every time, and the data amount can be greatly reduced.

Further, if a state occurs in which there is no correlation between the displayed images while displaying images continuously, the data in the character data shared area may be rewritten with data newly read from a CD ROM or the like. . Further, the capacity of the character data shared area may be made variable and changed according to software.

〔The invention's effect〕

According to the present invention, it is not necessary to sequentially store divided screens commonly used for each image in a memory for signal processing every time a display image changes, and the data amount of the entire image decreases accordingly. Therefore, the amount of data handled by the memory is reduced, and the load on the circuit is reduced.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram for applying one embodiment of the present invention, and FIGS. 2, 3, 4, 5, 6, and 7 are image processing according to one embodiment. FIG. 8 is a flow chart for explaining one embodiment. (1) Central control unit, (2) CD ROM unit, (3),
(4) and (5) are RAM, (6) is an image display unit,
(7) is a monitor receiver.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G09G 5/14 G06T 1/60 G09G 5/02 G09G 5/36 G09G 5/40

Claims (3)

(57) [Claims] An image data processing device for storing image data read from a storage medium in a memory and displaying an image represented by the image data on a display device, wherein a plurality of images are continuously displayed on the display device. If
The image data of the common partial image common to the plurality of images is read from the storage medium and stored in the memory, and is displayed on the display device every time the image displayed on the display screen is switched. Image data of a new partial image that constitutes the image to be processed together with the image data of the common partial image stored in the memory, and reading the image data from the storage medium and storing the image data in the memory. Image data processing device. 2. The image data processing device according to claim 1, wherein during continuous display of the plurality of images, the memory displays the image data of the common partial image and the image data of the common partial image continuously on the display device. And image data of two partial images constituting the two partial images together with the common partial image, wherein the means displays an undisplayed partial image of the two partial images together with the common partial image. In the meantime, the image data processing device rewrites the image data of the displayed partial image with the image data of the new partial image. 3. An image data processing method for displaying an image represented by image data read from a storage medium on a display device, wherein a plurality of images are continuously displayed on the display device.
A process of reading out the image data of the common partial image common to the plurality of images from the storage medium and storing the image data in the memory; and displaying the image data on the display device every time the image displayed on the display screen is switched. Reading the image data of a new partial image constituting the image to be performed together with the image data of the common partial image stored in the memory from the storage medium and storing the image data in the memory. A featured image data processing method.