JPH0478218B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical disk memory recording and reproducing device, and more particularly to image recording and reproducing using a page end code in an optical disk memory recording and reproducing device.

BACKGROUND TECHNOLOGY Conventionally, as a method for recording image signals on an optical disk memory, a last recorded portion occurs in the last sector of one or more sectors on an optical disk memory in which image signals for one page of the original image are recorded. In the case where unspecified data is recorded in the last recorded part, or one page end code is recorded in the last recorded part, and the last recorded part still occurs in the final sector at that point, the last recorded part is had recorded unspecified data different from the page end code.

Problems to be Solved by the Invention However, according to the former method, when expanding a data-compressed image signal to an original image signal,
The data decompression unit could not detect the end of one page of the original image.
In order to complete the decompression process, it must be completed by, for example, software processing, and in this case, there is a problem that the readout time becomes longer due to the waiting time of the CPU.

On the other hand, the latter method can solve the above problem, but if the page end code cannot be detected, for example, if the page end code cannot be reproduced during the reproduction process from the optical disk memory,
Alternatively, if the reproduced page end code changes to a different code due to noise before reaching the data decompression unit, the decompression process cannot be completed and the device issues some kind of alarm or abnormal message. There is a problem with emitting.

The present invention has been made in view of the above problems, and it is possible to terminate the decompression process and normally terminate the image display even if the one page end code cannot be detected for some reason. The purpose of the present invention is to provide an optical disk memory recording and reproducing device that can perform the following steps.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention adds a plurality of page end codes to the end of a data-compressed image signal, and adds a plurality of page end codes to the end of the data-compressed image signal and the plurality of page end codes. If a page end code is recorded in the sector of the optical disk memory and a last recorded part occurs in the sector, the same code as the page end code is continuously recorded in the last recorded part until the end of the sector. It is equipped with the following.

Effect The present invention has the above-described configuration, so that even if a part of a plurality of page end codes changes to a code different from the page end code for some reason, the remaining page end codes are detected. Therefore, it is possible to finish the decompression process and normally finish displaying the image.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram showing an embodiment of an optical disc recording/reproducing apparatus according to an embodiment of the present invention.
This device includes an image reading section 1 for reading an original image.
Then, the original image signal from the image reading unit 1 is data compressed, and after the data for one page of the original image is compressed, a predetermined plurality (k1) of page end codes (total data amount n1 bytes) are generated and compressed. It has a data compression unit 2 that is added to the end of data.

This device also includes an image memory unit 3 that can store at least one page of compressed data, an optical disk memory input/output control unit 4 (described later), and an optical disk memory (not shown) that is a storage medium for storing data. It has an optical disk memory section 5 that performs reproduction, and a data expansion section 6 that expands compressed data into an original image signal.

The device further includes a soft copy unit 7 such as a CRT display, a hard copy unit 8 such as a printer, and a switch that selectively supplies the original image signal from the data decompression unit 6 to the soft copy unit 7 or the hard copy unit 8. SW1, and these members 7,
8, SW1 constitutes an image display section 9.

FIG. 2 shows a detailed block diagram of the optical disk memory input/output control section 4 in FIG.
0 and k1 page end codes indicating the end of one page of the original image are added by the data compression unit 2, and if there is a last recorded part in the sector of the optical disk memory, the same page is found in the last recorded part. A page end code generation circuit 21 for recording an end code, and a sector buffer memory (sector It has a capacity of s bytes) 22.

In FIG. 2, a terminal 23 is an input terminal for compressed data supplied from the data compression section 2 via the image memory section 3, and a terminal 24 is an input terminal for the compressed data and page end code reproduced by the optical disk memory section 5. Terminal 25 is an output terminal for supplying compressed data and page end code from sector buffer memory 22 to image memory section 3. Terminal 26 is an output terminal for supplying compressed data and page end code from sector buffer memory 22 to optical disk memory section 5. an input terminal for compressed data and a page end code supplied from the optical disk memory unit 5;
SW2 is connected to the terminal 23 for the sector buffer memory 22 when recording image data on the optical disk memory.
This is a switch for selecting whether to supply the compressed data and page end code supplied from the page end code generation circuit 21 or the page end code supplied from the page end code generation circuit 21.

The operation of the optical disc recording/reproducing apparatus having the above configuration will be described below.

As shown in FIG. 1, the apparatus control section 10 instructs the image reading section 1 to read the original image in response to an instruction from the operation section 11. The image reading section 1 binarizes the read image signal and supplies it to the data compression section 2. The data compression unit 2 performs data compression to reduce the redundancy of the binary image signal, and after completing the compression process of one page of binary image data, k1 pieces (data amount
A page end code of n1 bytes) is generated, added to the end of the generated compressed data, and supplied to the image memory unit 3. When the image reading section 1 finishes reading the original image for one page, the device control section 10 sends the compressed data for one page recorded in the image memory section 3 and the end of the page to the optical disk memory input/output control section 4. An instruction is given to record the code in the optical disk memory section 5.

Here, since access to the optical disk memory section 5 is performed in units of sectors of the optical disk memory (sector capacity s bytes), recording to the optical disk memory must also be performed in units of sectors. For this reason, the optical disk memory input/output control unit 4 has a sector buffer memory 22 (capacity s bytes) as shown in FIG.
is provided.

The optical disk memory input/output control section 4 takes s bytes of compressed data from the image memory section 3 into the sector buffer memory 22, then takes out the s bytes of compressed data from the sector buffer memory 22 and transfers it to the optical disk memory section 5. supply to The optical disk memory input/output control section 4 supplies all the compressed data recorded in the image memory section 3 to the optical disk memory section 5 by repeating the above operation.

Here, the total data amount of the compressed data amount for one page and the data amount n1 bytes of the page end code added at the end is not necessarily an integral multiple of the sector capacity s bytes of the optical disk memory. Therefore, if it is not an integer multiple as described above, if the operation of loading s bytes of compressed data into the sector buffer memory 22 in order to supply one page of compressed data to the optical disk memory section 5 is repeated, the data less than s bytes will finally be obtained. (Compressed data and the k1 page end codes,
or part of the k1 page end codes) remain in the sector buffer memory 22. Therefore, the page end code generation circuit 21 of the optical disk memory input/output control section 4
generates the same code as the page end code until the amount of data taken into the sector buffer memory 22 reaches s bytes.

This operation will be explained with reference to FIG. The control circuit 20 first switches on SW according to instructions from the device control section 10.
2 is connected to terminal c, and the compressed data and page end code supplied from terminal 23 are taken into sector buffer memory 22. The compressed data and page end code taken into the sector buffer memory 22 are transferred to the terminal 2.
5 to the optical disk memory section 5. As a result of this operation, when the data less than s bytes remains in the sector buffer memory 22, the control circuit 20 connects SW2 to d, activates the page end code generation circuit 21, and stores the data in the sector buffer memory 22.
The same code as the page end code is supplied to the sector buffer memory 22 until the amount of data taken into 2 reaches s bytes. The S byte data in the sector buffer memory 22 inputted by the above operation is supplied to the optical disk memory section 5 from the terminal 25.

Through the above operations, one page's worth of compressed data and a page end code are recorded on the optical disk memory which is the recording medium of the optical disk memory section 5, but the final page of one page's recording area on the optical disk memory is The states in which compressed data and page end codes are recorded in sectors are shown in FIGS. 3 to 6.

Figure 3 is an explanation of the symbols used in Figures 4 to 6, and Figure 4 is a code that is the same as the page end code when the total data amount of compressed data D1 byte and page end code n1 byte is less than s bytes. When m1 bytes are added, Figure 5 shows that the recording of page end code n1 bytes spans two sectors, n2 bytes of n1 bytes are recorded in the previous sector along with compressed data D2 bytes, and the remaining n3 bytes are recorded in the final sector. This is the case when it is recorded in In this case, m2 bytes of the same code as the page end code are added and recorded in the final sector. Figure 6 shows a rare case,
This is a case where the total data amount of the compressed data D3 bytes and the page end code n1 bytes reaches s bytes.

Next, the operation from taking out the compressed data recorded as described above from the optical disk memory section 5 to displaying it on the image display section 9 will be explained.

In response to an instruction from the operation section 11, the device control section 10 instructs the optical disk memory input/output control section 4 to retrieve one page of compressed data from the optical disk memory section 5. The optical disk memory input/output control section 4 takes out the compressed data and page end code in units of s bytes from the optical disk memory section 5 via the terminal 26 and takes them into the sector buffer memory 22. The captured s-byte compressed data and page end code are sequentially supplied to the image memory unit 3 via the terminal 24.

When the compressed data and page end code for one page are stored in the image memory section 3, the device control section 10 causes the data decompression section 6 to convert the compressed data stored in the image memory section 3 into the original original image. It instructs the image display section 9 to decompress and also instructs the image display section 9 to display the original image data supplied from the data decompression section 6. The device control section 10 connects SW1 to a or b according to an instruction from the operation section 11, and selects whether to display the original image on the soft copy section 7 or the hard copy section 8.

The data decompression unit 6 sequentially extracts compressed data from the image memory unit 3 according to instructions from the device control unit 10, performs decompression processing, and supplies the resulting original image data to the image display unit 9. When the last compressed data is taken out from the image memory section 3 and the decompression is finished,
A page end code is supplied from the image memory section 3 to the data decompression section 6, and the data decompression section 6 ends the decompression process by detecting the page end code, and notifies the device control section 10 to that effect.

Effects of the Invention As is clear from the above explanation, the present invention adds a plurality of page end codes to the end of compressed data.
When recording compressed data and the plurality of page end codes in the corresponding sector of the optical disk memory, if a last recorded portion occurs in the sector, that is, the amount of compressed data to be recorded in the sector concerned and the page end code are different. If the total amount of data is less than the sector capacity, the same code as the page end code is added to the last recorded part until the sector capacity is reached, and a part of the page end code is different for some reason. Since it is possible to detect the remaining page end code even if it changes to a code, it is possible to normally finish displaying the image stored in the optical disk memory, providing a reliable device. It becomes possible to do so.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an optical disk recording and reproducing apparatus showing one embodiment of the present invention, FIG. 2 is a detailed block diagram of the optical disk memory input/output control section in FIG. 1, and FIG. An explanatory diagram of the symbols used in Figure 6, Figures 4, 5, and 6 show compressed data and page end code recorded in the last sector of the recording area for one page on the optical disk memory. It is a figure showing a state. 1... Image reading section, 2... Data compression section, 3...
...Image memory section, 4...Optical disk memory input/output control section, 5...Optical disk memory section, 6...Data decompression section, 7...Soft copy section, 8...Hard copy section, 9...Image display Part, 10...Device control unit, 11...Operation unit, 20...Control circuit, 21...
...Page end code generation circuit, 22...Sector buffer memory.

Claims (1)

[Claims] 1 means for reading an original image, means for data compressing the original image signal from the reading means, generating a plurality of page end codes indicating the end of the original image of one page and adding them after the compressed data, means for adding a page end code that is the same as the page end code corresponding to the last recorded portion when a last recorded portion occurs in the last sector of the disk memory; and a means for adding the compressed data and the page end code to the optical disk memory. a means for storing and reproducing the compressed data from the storing and reproducing means, a data decompression detecting means for decompressing the compressed data from the storing and reproducing means and detecting a page end code, and a means for displaying the decompressed original image signal. Disk memory recording and playback device.