| 摘要 |
<p>An encoder in an encoder/decoder system includes a circuit (1) for orthogonally transforming an input image signal, a circuit (81) for receiving the input image signal, judging which orthogonal transformation coefficient is to be omitted and which orthogonal transformation coefficient is to be interframe-coded, and outputting a judgement result as mode information, and a circuit (5) for receiving an output signal from the orthogonal transformation circuit (1), omitting the orthogonal transformation coefficient according the mode information, and outputting a coded image signal. In a decoder in the encoder/decoder system, the orthogonal transformation coefficient is omitted on the basis of the mode information sent from the encoder, thereby decoding the image signal.</p> |
