| 摘要 |
<p>A digital image coder which has a coder (1100b) for differentially coding a low-resolution texture signal (Std) and a coder (1100a) for differentially coding a high-resolution texture signal (Sth), performs the supplementary processing to replace the non-significant sample value of the low-resolution texture signal reproduced by the above coder (1100b) with the pseudo sample value obtained from its significant sample value by means of the supplementer (138) in the above coder (1100b) when differentially coding the high-resolution texture signal (Sth), using its prediction signal, and produces the prediction signal for the above high-resolution texture signal (Sth), based on the reproduced low-resolution texture signal to which the above supplementary processing is applied, as shown in the Figure. In such constitution of image coder, since the prediction signal of the high-resolution texture signal (Sth) is produced based on the reproduced low-resolution texture signal to which supplementary processing is applied, the differential signal being the difference between the high-resolution texture signal of the block (unit processing region) to become the target of coding processing and the prediction signal is suppressed, and the high-resolution texture signal corresponding to the block positioned at the boundary of an object can be differentially coded while suppressing the deterioration of coding efficiency. <IMAGE></p> |
