JPH02267778A - Optical disk reproducing device - Google Patents

Abstract

PURPOSE:To facilitate the read and display without using exclusive devices for restoring data and display respectively by providing a restoring function for restoring a compressed data concurrently with the read of the data from an optical disk. CONSTITUTION:A compressed data stored in a CD-ROM disk is read out by a CD-ROM driving device 26 with an image data restoring function, and is processed by performing data processing of error correction, etc., and moreover by performing restoration processing simultaneously. While the above-mentioned read and restoration are performed, an image data within a display objective range is transferred via a CD-ROM interface cable 20 to a personal computer 21 to be written inside in a display storage. By this method, the data can be displayed at the display 22. As a result, the cost for the device of an image data retrieval system with an optical disk as a medium is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a system that utilizes a database that compresses information with a large amount of data such as image data and records it on a CD-ROM or ROM luminescent disc. This article relates to an optical disc playback device that is a good enemy to build around a computer.

[Conventional technology]

Generally, a search system that uses image data compressed and recorded on an optical disk such as a CD-ROM uses a dedicated device for restoring the compressed data.

Therefore, the means to display one image is CD
- Read the compressed data from the ROM, transfer the data from the quick-acting device to the personal computer and store it, and then transfer it to the dedicated device and restore it, and then display it on the dedicated display device. An example of this method can be found on page 77 of the January 1987 issue of Hitachi Review.

[Problem to be solved by the invention]

In the conventional method described above, the compressed image data is decompressed and restored using a dedicated device, but it is also necessary to use a dedicated display device for display. No consideration was given to transferring and displaying the restored image data to a personal computer, and in order to establish an inexpensive search system centered on personal computers, the system equipment would be expensive and the data would be too expensive. There were problems such as a large number of transfers and a long time required to display the image data.

An object of the present invention is to display restored image data on the screen of a personal computer at a speed equivalent to or faster than when dedicated devices are used for data restoration and display.

[Means to solve the problem]

The above purpose is to connect a restoration circuit for the MMR compression method, etc. to the internal data bus line and control signal line of an optical disc playback device that has a control unit and an interface circuit unit in an optical disc drive unit such as a CD-ROM0M. - This is achieved by reading signals from an optical disk such as a ROM and at the same time controlling the restoration process and transferring the restored data from the interface circuit to an external personal computer or the like.

[Effect]

A restoration function added to an optical disk device such as a CD-ROM0M restores compressed data in parallel with reading data from an optical disk such as a CD-ROM, and transfers the restored data to a personal computer or the like.

This allows the image data to be used and displayed on a personal computer.

〔Example〕

Hereinafter, one embodiment of the present invention is shown in FIGS. 1 and 2, a conventional example of the equipment configuration of an image data display system is shown in FIG. 3, and an example of the method according to the present invention is shown in FIGS. 4 and 5. A conventional example of a schematic flowchart of processing is shown in FIG. 6, and an example according to the present invention is shown in FIG. 7 for explanation.

If we roughly look at the functions of the CD-ROM late drive device 26 with image data restoration function of the embodiment, as shown in FIG.
It consists of a ROM drive section 27 and an image data restoration circuit diagram 28. Furthermore, if we look at the details, the configuration of the main functions is as follows:
As shown in the figure, the pick 77 pull section 2, the CD reading section 3, the CD
ROM signal processing section 4. It consists of a drive control section 5, an interface circuit section 9, a control section 10, a ring buffer 6 for compressed data added in the present invention, a restoration circuit section 7, and a restored data frame memory 8. The restored data frame memory 8 has a size equivalent to one page of A4 size image data. Logically, it corresponds to the don't data position as shown in FIG.

Restore the compressed data recorded from 2 sectors of X97 seconds on CD-ROM disk 1 and find the coordinates (X + y +) 16
When displaying data inside a rectangle surrounded by and (xtt yz)17, the conventional method uses the configuration shown in
As shown in the processing outline flowchart of FIG. 6, the personal computer 21 accesses 2 sectors in X97 seconds (
61) and read request (51) L, CD-ROM drive 19 accepts the request and reads one sector of compressed data recorded on CD-ROM disk 1 62), C
The data is transferred to the personal computer 21 via the D-ROM interface cable 20 and stored (52). After temporarily storing one page of compressed data, the personal computer 21 requests to stop reading (53)L;
, the CD-ROM drive device 19 finishes reading (63)
do. Next, initialize the image data restoration device 24 (6
4) After t, one block of temporarily stored compressed data is transferred from the personal computer 21 via the GP-IB bus subtable 23 (54). The image data restoration device 24 performs restoration processing while receiving 1 byte of data (65)L.

Furthermore, the image data within the display target range is stored in the restoration device 24.
By writing (66) into the internal display memory, the data is displayed on the high-definition display 25, which is a dedicated display device. At this time, in order to display on the CRT display 22, which is a general-purpose display device of the personal computer 21, after restoring one page of image data with the restoring device 24, the personal computer 21 requests transfer of the image data (55 )L, the image data of the display target range is prepared for transfer in the restoration device 24 (After 671, the compressed data is transferred in the opposite direction via the GP-IB bus 3,
That is, from the restoration device 24 to the personal computer 21
It is necessary to transfer the image data in the direction of (68), receive the image data (56), and write it into the display memory inside the personal computer 21 (57). However, according to the present invention, the compressed data stored in the CD-ROM disk 1, which has the configuration shown in FIG. 4, is read out and restored by the CD-ROM II drive unit 26 with an image data restoration function, which is internally configured as shown in FIG. However, it has become possible to display the image data on the display 22 by transferring the image data within the display target range to the personal computer 21 via the CD-ROM interface cable 20 and writing it into the internal display memory.

Hereinafter, the above CD-ROM with data restoration function 1l
The operation of the K moving device 26 will be explained in detail using the processing schematic flowchart shown in FIG.

When the personal computer 21 requests image data reading (111), the CD-R with data restoration function is
The control unit 10 inside the OM drive device 26 performs processing (91) when accepting a request, and if the request is to read a new page, the drive control unit 5 receives compressed data from sector Z for X minutes and Y seconds. (93) and waits for the compressed data to start being read into the ring buffer section 6 (94).
. When the drive control section 5 accepts the compressed data read request, it operates the pickup section 2 via the CD reading section to access the Z sector for X minutes and Y seconds (71).

If the data can be accessed, the data recorded on the CD-ROM disc 1 will be detected by the pickup unit 2 and the data will be read onto the CD
Writing (72) to the compressed data ring buffer section 6 via the read/read length CD-ROM signal processing section 4 is started.

When the bytes are read out in one sector and two bytes, the control unit is notified of the fact that the bytes have been read out (73). Furthermore, reading continues until the required reading amount is completed or there is no space left in the ring buffer section 6 (74). If there is no more space in the ring buffer section 6, reading is temporarily interrupted and the process waits until there is more space in the ring buffer section 6 as the restoration process progresses (75). When a free space is available, the --time interruption is canceled and reading and ring buffer writing (72) are resumed. on the other hand.

When the control unit 10 receives notification that the compressed data has started to be read, it starts the restoration circuit unit (95) and waits for the restoration to reach the coordinates (0, y + 1) (96). .

Then, after performing the initial setting (81), the restoration circuit section 7 reads out the data written in the ring buffer section 6, performs a restoration process on the image data, and stores the restored data 11 at the coordinates (0) of the restored data frame memory 8. ,0) position 12
A series of restoration processes (82) for writing starts from.

The second byte of data 11 after restoration is the coordinates (S, O) position 1
Write to 3. After restoration, data 11 is written in coordinates (
Xll yt) Finish position 16 and set the coordinates (0'+ y1
+1) When the position 14 is reached (83), the controller is notified (84) that restoration has been reached. Furthermore, the restoration process is continued until one page is completed or the ring buffer becomes empty (86).
Continue until. If it becomes empty, the restoration process is temporarily suspended and the ring buffer waits for the compressed data to be read into the ring buffer (87). If it is loaded, restore processing (82
) is resumed. On the other hand, the control unit 10 determines that the restoration is at the coordinates (0,
y +1) Receive notification that position 14 has been reached (84
) and notifies the personal computer 21 through the interface circuit section 9 that the transfer is ready (97
)do. After issuing a read request (111), the personal computer 21 normally erases one screen, and then waits for a notification from the CD ROM El drive with data restoration function 26 that the data is ready for transfer (112). Upon receiving the report, it immediately requests transfer (113). The control unit 10 is.

The reception of the transfer request begins with processing (98) and transfer (99)L of restored data within the transfer target range 15 from the interface circuit section 9 as transfer data 18. At this time,
The personal computer 21 receives the image data and writes it into display storage (114). From the perspective of the user of the personal computer 21 and the system, the series of processes ends when the restoration process and the transfer of the restored data pass the coordinate (Xi, yz) position 17.
Moving on to the next other process (115), the C
Inside the D-ROM 111u operating device 26, each section continues processing until all data for one page has been processed, and one page's worth of image data is recorded in the restored data frame 8.

Next, when the personal computer 21 makes a read request (111) for a different range of the same image data, the control unit 10 of the CDROM drive device 26 with a data restoration function controls the image data stored in the restored data frame 8. It is determined that the page is the same as the data (92), and the CD is
- Immediately notify (97) L that image data is ready to be transferred to the personal computer 21 without starting processes such as reading and restoring the ROM disk 1. From then on, the restored data frame memory is processed in the same manner as described above. 8 is transferred to the personal computer 21.

According to this embodiment, almost any part of one page can be displayed on the display screen of a general-purpose display device such as a personal computer.
It can be read, transferred, and displayed in a time equal to the time required to read compressed data from an OM disk.

〔Effect of the invention〕

According to the present invention, compressed data such as image data recorded on an optical disk such as a CD-ROM can be easily read using a personal computer or the like and its display device without using expensive dedicated equipment for decompression and display. , can be displayed. Furthermore, the time required from the start of reading the CD-ROM disc to the end of display can be reduced by about 1.5 seconds compared to the time required by the conventional method.

According to the present invention, it is possible to reduce the equipment cost of an image data retrieval system using an optical disk such as a CD-ROM as a medium. Furthermore, it has the effect of improving the work efficiency of system users.

[Brief explanation of drawings]

FIG. 1 shows a CD-ROM with a data recovery function according to an embodiment of the present invention.
ROM1[<A block diagram of the moving device; FIG. 2 is an explanatory diagram showing writing and reading of image data to and from the restored data frame memory in FIG. 1; FIG. 3 is an explanatory block diagram of the conventional example; 4 and 5 are explanatory block diagrams of the present invention, FIG. 6 is a schematic flowchart of processing in the conventional example, and FIG. 7 is a schematic flowchart of processing in the present invention. DESCRIPTION OF SYMBOLS 1... CD-ROM disk, 6... Ring buffer section for compressed data, 7. Restoration circuit section, 8... Restoration data frame memory, 10... Control section. Figure 1 7, C″D-shakuoMY4sk8,4shiyaterifu1-6metsu7

Claims (1)

[Claims] 1. An image data restoration circuit is added inside an optical disc playback device that has a control unit, an interface circuit unit, etc., and an optical system detection circuit reads out signals compressed and recorded on the optical disc, and performs data processing such as error correction. An optical disc reproducing apparatus characterized in that the image data restoration circuit performs data restoration processing at the same time, and outputs the restored data from the interface circuit section.