| 摘要 |
<p>Direct encoding of composite video signal which includes both luminance signal (Y) and chrominance signal (C) is carried out without separating luminance signal from chrominance signal. A motion of a block in a frame (8) which provides a motion vector (MVx, MVy), and a from a preceding frame is detected in a motion detector reference block is defined in said preceding frame which is locally decoded according to said motion vector. A block to be encoded in a current frame is converted through Hadamard conversion H (1). A composite motion compensation (7) provides a prediction block according to said reference block, which is subject to phase compensation of color sub-carrier, according to remainder of the value MVx+MVy when said value is divided by 4assuming that sampling frequency of video signal is four times as high as color sub-carrier frequency. The difference (9) of each element between output matrix of said Hadamard conversion (1) and matrix of said prediction block is quantized (2) and encloded (3). The encoded output is transmitted together with said motion vector. Thus, composite video signal is encoded directly signal, and excellent signal quality with high compression ratio is obtained.</p> |
