JPS62208085A - Character display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a character display device that reproduces and provides all image information and audio information using a cassette tape.

2. Description of the Related Art Conventionally, in the case of a character display device that uses a cassette tape to reproduce character information, the image data stored on the cassette tape is composed of three primary colors of R, similar to the commonly used still image data. It consists of data, G data, and B data, each of which is compressed. Character information is displayed by reading image data from a cassette tape, developing R, G, and B data and writing them into a graphic memory.

Problems to be Solved by the Invention However, when reading image data from a cassette tape and displaying character information as described above, due to a misreading of the image data, the corresponding part becomes a color other than the specified color, and the characters This has the disadvantage that the phenomenon becomes difficult to read.

Means for Solving the Problems The present invention consists of a microcomputer (hereinafter referred to as CPU) that reads image data from a cassette tape and controls the image display procedure, and a still image that stores the image data read from the cassette tape. Memory (hereinafter referred to as 5-RA
5-A development buffer (hereinafter referred to as B, UFFICR) that expands and temporarily stores the contents of the RAM, a video processor (hereinafter referred to as VDP) that controls the display of image data, and connects to the VDP. It consists of a graphic memory (hereinafter referred to as G-RAM) and an image display section that displays images, and the image data to be stored on the cassette tape is created by extracting only the character data from the R, G, and B data of the three primary colors. The data is converted into a silhouette data format, stored together with 1-byte information specifying the character color, and the silhouette data is read to display text information.

Effects of the Invention With the above-described configuration, even if there is an error in reading the image data from the cassette tape, colors other than the designated character color will not be displayed, and the characters will not be partially distorted. There is no problem with visibility, and by changing the image data from R, G, and B data to silhouette data, the amount of data can be reduced to about 100%, so the amount of information can be stored three times as much. Information reading speed can be improved.

Example Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a block diagram showing an embodiment of the character display device of the present invention. In FIG. 1, there is a cassette tape 1 that stores image data, and an 0pu2 that reads the image data from the cassette tape 1 and controls the processing procedure of character information.
, an S-R that stores data read by the CPU2.
A M3, BUFFER4 for expanding and temporarily storing the contents of 5-RAM3, image display control ale line'
) VDP 5, G-RAMs connected to the VDP 5 and storing image images, and the G-RAM
It is composed of an image display section 7 that displays the contents of 8.

FIG. 2 is a follow chart showing the operating procedure of this embodiment, and the specific operation of this embodiment will be explained using this figure. In step a, image data is read from the cassette tape 1 and stored in the 5-RAM 3. In step b, S −
The display coordinate point 9 display area and character color data are obtained from the contents of RAM a and stored in the work area. Step C uses the 1-byte character color data obtained in step b to
Convert it to B code and store it in the work area. Step d extracts the size H in the Y-axis direction from the display area data obtained in step b, and sets it in a register.

Thereafter, the process is repeated H times from step e to step m. Step e is the 5-R stored in step a.
Obtain silhouette data for one line (W bytes in the X-axis direction) from AM3 and perform data expansion. Step f takes out the size W in the X-axis direction from the display area data obtained in step b, and sets it in a register. In step g, extract one byte from the data expanded in step e,
A logical AND is performed on each of the R and G@B codes obtained in step C, and each is stored in BUFFICR4.

In steps h and i, the contents of W are subtracted by "1", and if the result is not "0", the process returns to step g, and the same process is repeated. If it is "o", proceed to the next step.

Next, in step j, the coordinate address of G-RAMa is obtained from the display coordinates set in step b, and is stored in the address work, and the contents of the display coordinate data are updated.

In step G- from the coordinate address obtained in step j
Write the contents of BUFFICR to RAMcs. Step! And in step Otori, subtract "1" from the contents of H set in step d, and if the result is not "0", proceed to step e.
Go back and repeat the same steps.

If it is "0", Dosaku is completed. By performing the above processing, character information can be displayed.

Effects of the Invention As described above, according to the present invention, by using the silhouette data method for image data, even if there is a misreading of the data, a color other than the specified character color will not be displayed, and partial distortion of the character can be prevented. However, there is no problem with visibility, the amount of image data can be further reduced, and the reading speed of character information on one screen can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a character display device showing one embodiment of the present invention, and FIG. 2 is a flowchart showing the processing procedure of the same embodiment. 1...Cassette tape, 2...Microcomputer (CPU), 3...Still image memory (S-RAM), 4...Development buff 77 ( B
UFFER), 6...Video processor (V
DP), 6... Graphic memory (G-RA
M), 7... Image display section.

Claims (1)

[Claims] a microcomputer that reads image data from a cassette tape and controls image display procedures; a still image memory that stores compressed image data from the cassette tape via the microcomputer; and a still image memory that stores compressed image data from the cassette tape; It is equipped with an expansion buffer for restoring, a video processor for controlling the display of images, a graphic memory connected to the video processor for storing image data, and an image display unit, and for displaying compressed character information stored on a cassette tape. A character display device that develops data using the microcomputer and displays monochrome character information.