| 摘要 |
An image data decoding apparatus decoded synthesized-compressed data in which image data with a plurality of resolutions is compressed in block units by different compression systems, respectively, and each compressed data is synthesized to a single piece of compressed data. The image data decoding apparatus comprises a separating section 1005 - 1 for separating the synthesized-compressed data to compressed data with every resolution, decoding sections 1005 - 2, 1005 - 3 for decoding separated and compressed data with a first resolution to obtain first high-resolution data and also decoding compressed data with a second resolution obtained from the separating section to obtain first low-resolution data, a conversion section 1005 - 4 for converting the first low-resolution data into second high-resolution data, and an image synthesis section 1005 - 5 for synthesizing the first and the second high-resolution data to obtain a decoded image signal.
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