发明名称 |
HYBRID PREDICTIVE CODERS AND DECODERS FOR DIGITAL VIDEO SIGNALS |
摘要 |
In a coder for digital video signals, the difference between the ditigal video signals and prediction signals is subject to a transform prior to quantisation. In particular, a transform applied to the values of a block of pixels to produce sets of coefficients in the spatial frequency domain. A quantiser (14) acts on the coefficients to product a coded output which is decoded at a local decoder (18) operative on the coded output. The coder further includes means (20) for adding the prediction signal to the output of the local decoder (18) and a framestore (22) which receives the output of the adding means (20). A multiplier (26) multiplies the output of the framestore (22) by a factor slightly less than unity to form the prediction signal. |
申请公布号 |
GB9019524(D0) |
申请公布日期 |
1990.10.24 |
申请号 |
GB19900019524 |
申请日期 |
1990.09.06 |
申请人 |
BRITISH BROADCASTING CORPORATION |
发明人 |
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分类号 |
G06T9/00;H04N7/26;H04N7/50 |
主分类号 |
G06T9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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