| 摘要 |
PURPOSE:To perform the encoding of image data with high efficiency by a moving image by performing three-dimensional orthogonal transformation by a three-dimensional block in which a time base direction is considered. CONSTITUTION:An image memory 1 stores digital image data corresponding to L continuous images on a time base supplied as input. The segmentation circuit 2 of the image segments the data as the block having size of (MXN), and supplies it in a three-dimensional orthogonal transformation circuit 3. As for segmented digital image data, the orthogonal transformation is applied on the L images (P1-P(L-1)) at every block group at a corresponding position, respectively in the three-dimensional orthogonal transformation circuit 3, and a required orthogonal transform coefficient is supplied to a motion decision part 4 and a definition decision part 5. By performing bit allocation for adaptive quantization by utilizing the information of the motion of the image and that of the definition of the image, the encoding with high efficiency can be attained. |
