| 摘要 |
A tile (1) of pixels (6) is encoded by variable length encoding blocks (3-9) of pixels (10) constituting different subsets of the tile (1) to form sequences of symbols (23-29) as encoded representations of the pixel values. A respective size indication (33-39, 52, 54, 56, 58) is determined for each set (12, 14) of at least block. A size indication (33-39, 52, 54, 56, 58) is representative of a compression ratio of a combined sequence (23-29, 51, 53, 55, 57) corresponding to the at least one sequence of symbols (23- 29) obtained for the at least one block of the set (12, 14). The combined sequences (23-29, 51, 53, 55, 57) are arranged in a pixel value buffer (80) in a buffer memory (20). The size indication (32-39, 52, 54, 56, 58) determined for a given set (12, 14) is also stored in the pixel value buffer (80) in the buffer memory (20) to precede, according to a reading order of the pixel value buffer (80), the combined sequence (23-29, 51, 53, 55, 57) of the given set (12, 14). |
