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Method for preventing error speading while recording compressed image data
| Details |
Inventors: Itoi, Satoshi;
Assignee: NEC Corporation (JP)
Primary Examiner: Chin; Tommy P.
Assistant Examiner: Nguyen; Huy
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen
A method of recording a sequence of video blocks, each comprising a plurality of bytes, each representing compressed image data code, includes the step of recording a video block identification signal after recording a synchronization signal in each of a plurality sync blocks. Then video data codes are recorded adjacent the video block identification signal. This is followed by a connection code being recorded adjacent the video data codes in the video blocks. The video block identification signal recorded between the synchronization signal and the video data codes contains a coded combination of bits for defining the position of first bit or byte of a new video block in the video data area. |
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DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a compressed image data recording system, free from the aforementioned defects of the prior art, which is capable of preventing an error from spreading beyond one sync block when an uncorrectable error occurs, when a search is executed in a VTR or when an editing is carried out, so as to obtain a reproduction image of high quality.
According to the present invention, a video block identification signal is inserted or recorded after a synchronization signal in each sync block, and by showing a presence and absence of a new video block or blocks, head positions of video blocks, byte numbers, bit numbers and their video block numbers, a compression mode and the like in the sync block, when an uncorrectable error occurs while performing a search in a VTR or the like, or when an editing process is performed, an error spreading beyond one sync block can be prevented as much as possible to obtain a reproduction image of high quality.
In accordance with one aspect of the present invention, there is provided a method of recording compressed image data, in which image signals are divided into several tens of thousands of video blocks and a suitable bit number is assigned to each video block to record compressed image data controlled so as to be settled in a bit number determined by either one field unit or one frame unit, comprising the steps of: determining a byte number of each video block to be equal to 8 n (n.
gtoreq.
1) bytes so as to control video data to a fixed byte number by either one field unit or one frame unit; determining a minimum unit in a data recording to a sync block; inserting a video block identification signal after a synchronization signal in each sync block by using the fact that each new video block in each sync block starts from 8(n-1)th bytes; and recording a presence and absence of the new video block, a head position of the video block and its video block number, and a compression mode in the sync block
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TV Signal 
