发明名称 |
Verfahren und System zum Senden und Empfangen von digitalkodierten Videobildern |
摘要 |
Video images are encoded by transform coding, resulting in data blocks each including a DC-coefficient and a plurality of AC-coefficients. The coefficients of a number of said transform blocks are variable-length encoded and transmitted. In order to avoid a complete loss of datablocks in case of a transmission error, the most significant codewords of a group of blocks are transmitted first so as to achieve that at least the DC-level of the blocks is likely to be retained. The coefficients may also be recorded on a videorecorder. Fast playback of recorded images so encoded, leads to very poor quality because some data blocks are not being read in the search mode. To improve this quality the DC-coefficients and if desired predetermined AC-coefficients of selected ones of the transform blocks to be recorded on one track are packed together to form a DC-packet and such packet is recorded on a selected part of the track. The DC-packet is chosen such that it can be read out as a unit at various search speeds, and can be read partially at higher search speeds. <IMAGE> |
申请公布号 |
DE69229945(T2) |
申请公布日期 |
2000.05.18 |
申请号 |
DE1992629945T |
申请日期 |
1992.12.14 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V., EINDHOVEN |
发明人 |
DE WITH, PETER HENDRIK NELIS;NIJSSEN, STEPHANUS JOSEPH JOHANNES;RIJCKAERT, ALBERT MARIA ARNOLD;KEESMA, GERRIT JOHAN |
分类号 |
G06T9/00;H04N5/783;H04N5/926;H04N7/26;H04N7/30;(IPC1-7):H04N7/24 |
主分类号 |
G06T9/00 |
代理机构 |
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地址 |
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