发明名称 |
METHOD OF CODING A VIDEO SIGNAL FOR TRANSMISSION IN A RESTRICTED BANDWIDTH |
摘要 |
<p>PCT No. PCT/GB86/00798 Sec. 371 Date Oct. 5, 1987 Sec. 102(e) Date Oct. 5, 1987 PCT Filed Dec. 23, 1986 PCT Pub. No. WO87/04033 PCT Pub. Date Jul. 2, 1987.A video signal is coded for transmission in a restricted bandwidth by sub-dividing a frame of picture information into a set of constituent blocks, measuring the amount of picture activity in each block, sampling the information in each block at a rate related to the amount of picture activity in that block, and adding to the coded block a supplementary signal indicating the sampling rate used for the block. Thus a decision is made on a block-by-block basis as to whether the block is transmitted with full accuracy or whether it can be adequately reconstructed from the previous frames.</p> |
申请公布号 |
EP0250533(B1) |
申请公布日期 |
1993.01.27 |
申请号 |
EP19870900237 |
申请日期 |
1986.12.23 |
申请人 |
BRITISH BROADCASTING CORPORATION |
发明人 |
WELLS, NICHOLAS, DOMINIC;KNEE, MICHAEL, JAMES;SANDBANK, CHARLES, PETER |
分类号 |
H04N7/015;H04N7/12;H04N7/26 |
主分类号 |
H04N7/015 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|