| 摘要 |
A hierarchical image coding apparatus of the present invention, as shown in FIG. 1, comprises a subsampling unit for subsampling a high-resolution image signal Hg as an input image signal to produce a low-resolution image signal LSg, a low-resolution coding section for sequentially coding the low-resolution image signal LSg for each block comprising a plurality of pixels, and a high-resolution coding section for sequentially coding the high-resolution image signal for each block comprising a plurality of pixels, wherein the high-resolution image signal HSg is coded by referring to the low-resolution image signal LSg corresponding to a reference low-resolution block located at the same spatial position as a target high-resolution block to be coded. In the hierarchical image coding apparatus so constructed, an image signal including shape information of an object can be hierarchically coded without degrading coding efficiency. |
