| 摘要 |
Encoded data obtained by high-efficiency sequential encoding after an orthogonal transformation of image blocks each having a specified number of pixels are used. Preceding image decompression processing is performed on DC encoded data among the encoded data in a DC decompression processing section constituted by a DC decoding section 11A, a DC inverse quantization section 12A and a DC IDCT section 13A, so that an image is displayed. Subsequently, image decompression processing is performed on AC encoded data in addition to the DC encoded data in an AC decompression processing section constituted by an AC decoding section 11B, an AC inverse quantization section 12B and an AC IDCT section 13B, so that an image is displayed. With this procedure, in spite of use of encoded data encoded by a commonly used conventional sequential encoding technique, the same image displaying effect as of the data structure of the progressive encoding technique can be achieved and the displayed image can be sequentially refined. |
