| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide the image coding data generating method in which image data are scrambled without deteriorating the image quality of an original image. SOLUTION: In the image coding data generating method, image data are divided into blocks each of number of longitudinal and lateral pixels is a prescribed number, discrete cosine transformation(DCT) is applied to each divided block, data subject to DCT are quantized and the quantized data are converted into a quantization DCT coefficient block group so as to apply modulation coding to the image data. In this case, a Huffman table used to apply modulation coding to the quantization DCT block is generated from a quantization DCT block group and the generated Huffman table is used, a DCT block coefficient is subject to Huffman coding to generate image coding data, the Huffman table is encrypted and the encrypted Huffman table is inserted to the image coding data to obtain the image coding data of the image data.</p> |
