JPS61284186A - Still picture display device - Google Patents

Abstract

PURPOSE:To display a picture surely in a pertinent position and minimize disturbance of the picture by processing still picture compression data having a picture address. CONSTITUTION:A cassette tape on which compressed still pictures are recorded is set to a drive mechanism 10 and is read into a CPU 4 through an I/F 8. Four picture addresses following a carrier 12 are read in, and two addresses having the same value out of 4 addresses are found at least, and this value is adopted as a picture address 13 of the next picture data 14, namely, a column number on the picture, and data 14 is read and stored in a RAM 5. This stored data is collected with a compression format to release compression in the order of G, R, and B, and developed data is written in a VRAM 7 through a VDP 6. Thus, data of one column is displayed on a display device 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention reads various still image data recorded on a cassette tape using a data compression means having a screen address and displays the data on a display device such as a color display. The present invention relates to a still image display device which can obtain still images one after another and is extremely effective when used in acid information systems, educational systems, learning systems, and equipment operation explanation systems.

2. Description of the Related Art In a conventional still image display device, one screen of still images without screen address information was continuously compressed still image data read from a cassette tape and played back.

Problems to be Solved by the Invention However, with the above-mentioned conventional technology, if the data is garbled due to an unexpected disturbance when reading compressed still image data from a cassette tape, the still image may be distorted. However, since the compressed data does not have screen address information, there is a problem in that disturbances in the middle of the screen affect subsequent screens.

In view of the above-mentioned problems, the present invention has been developed so that when reading still image data from a cassette tape, even if some data is corrupted, the screen is only disturbed in that column, without affecting subsequent screens, and is effective. The present invention provides a still image display device that can provide stable images.

Means for Solving the Problems In order to solve the above problems, the still image display device of the present invention reads still image data recorded on a cassette tape using a data compression means having a screen address for each column. An image data reading means, a still image data storage/management means for storing the read still image data in RAM and managing it, and uncompressing the still image data stored in the RAM and displaying it on a color monitor display, etc. The device is equipped with a still image display means for displaying on the device.

Effect of the Invention With the above-described configuration, the present invention can reliably display an image at a corresponding position by processing still image compressed data having a screen address, and also prevent the compressed data from becoming non-regular data due to some influence. If the screen is distorted, the disturbance to the image on the screen can be minimized.

Embodiment Hereinafter, a still image display device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram of a still image display device according to a first embodiment of the present invention. In FIG. 1, 1 is still image data reading means, 2 is still image data storage/management means, and 3 is still image display means.

FIG. 2 is a block diagram of this embodiment. 4 is the 8-bit CPU), 5 is the CPU that stores still image compressed data (
RAM, 6 is a video display processor (hereinafter referred to as VDP) that controls still image display, 7 is a video RAM (hereinafter referred to as VRAM) connected to VDP 6
, 8 is a tape reading interface (hereinafter referred to as tape reading x7y) for reading still image data information recorded on a cassette tape, and 9 is a still image data reading means 1. Still image data storage/management means 2.
A ROM storing a control program for controlling each means of the still image display means 3, 10i1 is a cassette drive mechanism, and 11 is a display device.

Figure 3 shows the recording format of compressed still image data recorded on a tape, 12 is a carrier part in which 20 bits of data representing M19+ are continuously recorded, 13 is a screen address, This indicates which column on the screen the image data following corresponds to, and four identical values (4 bytes) are consecutively recorded. 14 is image data in which compressed still image data is recorded.

The carrier 12, the screen address 13, and the image data 14 constitute one column of data, and are recorded continuously for the number of columns on the screen.

FIG. 4 is a screen configuration diagram, and in this embodiment, horizontal 3
vnpe with a resolution of 20 dots x 190 dots vertically
Using , the data is divided into 40 columns with 8 horizontal dots as one column, and data compression is performed for each column.

Figure 5 shows the data compression format, with 8 dots horizontally x 1 dot vertically in Figure 4 as one unit of data during compression, and each dot corresponds to 1 bit. Data compression is performed from top to bottom. 16 is a compression format when the data is "1" continuously, that is, when all 8 pits are "1".
The bit 1 is set to 1, and the 0th bit to the 6th bit is 8.
Enter the number of consecutive data in which all pits are "1". 16 is a compression format for when the data is "0'!" consecutively, that is, when the data is all "0". Enter the number of consecutive data that is "o-'. 17 is when the data has the same pattern of “1” and “o” mixed, that is, “1” and “0” in 8 bits.
This is a compression format where the 7th bit is ``o'', the e bit is ``1'', and the 0th to 5th bits are 1'',
Enter the number of mixed data of 'o' and enter a pattern of mixed '1' and 40' in the following 1 byte. 18 is a compression format when the data is random, that is, when the same pattern does not appear consecutively. Fill in the number of random pieces of data, and then fill in each byte that follows with the actual pattern. Data compression is performed in the order of G (green), R (red), and B (blue), and at the end of each compressed data of G, R, and B, data of all 8 bits "0η" is inserted as a delimiter. .

The operation of the still image display device configured as described above will be described below with reference to FIGS. 1 to 5.

A cassette tape on which a still image compressed according to the data compression format 2 shown in FIG. 5 and the still image compressed data recording format shown in FIG.
/F8 to read. First, read the four screen addresses following the carrier 12, find at least two of the four with the same value, and use them as the screen address of the next image data 14, that is, the column number on the screen; is read and temporarily stored in RAM5.

By comparing the image data stored in the RAM 5 with the compression format shown in FIG.

Uncompress R and B in order, and save the expanded data to V.
By writing to the VRAM 7 via the DP 6, the data in the - column can be displayed on the display device.

As described above, according to this embodiment, by reading compressed image data with a screen address and expanding it, the image can be reliably displayed in the corresponding column, and the data on the tape can be erased due to some disturbance. If the image becomes distorted, it can be stopped by disrupting the image only in that column.

Effects of the Invention As described above, the present invention provides a still image data reading means for reading still image data recorded on a cassette tape by a data compression means having a screen address for each column, and a still image data reading means for reading still image data recorded on a cassette tape, and a method for storing the read still image data in a RAM. By providing a still image data storage/management means for storing and managing the still image data, and a still image display means for decompressing the still image data stored in the RAM and displaying it on a display device such as a color monitor display, The image can be reliably displayed at the appropriate screen position, and even if the data on the tape is garbled due to some unexpected disturbance, the screen will only be disturbed to a minimum, resulting in an effective and stable image. This is a still image display device that can continuously display images.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of a still image display device according to a first embodiment of the present invention, and FIG. 2 is a block diagram thereof.
Figure 3 is a recording format diagram of compressed still image data, Figure 4
The figure is a screen configuration diagram, and FIG. 6 is a data compression format diagram. 1...Still image data reading means, 2...
...Still image data reading means, 3...Still image display means, 4...8-bit CPU15...
...RAM, 6. River VDP. 7... VRAM, 8... Tape reading I/F 19... ROM, 10... Cassette drive mechanism, 11... Display device, 12...Career, 13...
・Screen address, 14... Image data, 16.
...Compression format when data is continuous with IJifi, 16...Compression format when data is continuous with 0, 17... Data is "i" Compression format when the same pattern is mixed with ``On'', 18... Compression format when the data is random. Name of agent Patent attorney Toshi Nakao Male Idiot 1st person
Figure I Figure 3 Figure 5

Claims (1)

[Claims] still image data reading means for reading still image data recorded on a cassette tape by a data compression means having a screen address for each column;
Still image data storage/management means for storing and managing the still image data in the RAM, and still image display means for decompressing the still image data stored in the RAM and displaying it on a display device such as a color monitor display. A still image display device characterized by: