| 摘要 |
A picture encoder which receives, as an input, a binary digital picture having an interlace structure wherein one frame is constituted of two fields, divides the picture into two-dimensional blocks, each of which is constitute of a plurality of pixels, and then encodes the picture block by block. A picture decoder which receives a picture coded signal coded by the picture encoder and decodes, block by block, the binary digital picture having an interlace structure wherein one frame is constituted of two fields. In the picture coder, a coding mode is selected for each block from two modes, one at which a picture is coded field by field and the other at which a picture is coded frame by frame, and according to the selected mode, the picture is coded either field by field or frame by frame, for one block after another. In the picture decoder, the picture is decoded either field by field or frame by frame for one block after another based on the mode information. <IMAGE> |
