| 摘要 |
PROBLEM TO BE SOLVED: To provide an image re-compression means also capable of dealing with a case where a resource, such as memory capacity is reduced. SOLUTION: The present invention relates to methods, systems and computer programs for encoding images. In one aspect, quantized frequency domain vectors (50) are sequentially generated from a sequence of blocks (32) of the image (34). Each quantized frequency domain vector (50) includes a set of quantized forward transform coefficients (48) that are derived from a respective image block (32). For each successive quantized frequency domain vector (50), a current input capacity level of a buffer (38) is determined and the quantized frequency domain vector (50) is modified to increase compressibility when the current input capacity level is determined to be below a prescribed threshold. Modified and unmodified quantized frequency domain vectors (50) are encoded into a sequence of encoded image blocks (36). The sequence of encoded image blocks (36) is stored in the buffer (38). COPYRIGHT: (C)2006,JPO&NCIPI |
