| 摘要 |
<p>There are disclosed a method for burying data in an image, by which a standard decoder can decode an image in which data is buried during JPEG encoding, the data buried in the decoding can be extracted completely even if an irreversibly encoding method is used, and the image deterioration caused by burying the data is little; and a method for extracting the data. The method is characterized in that an original image is divided into blocks in units of 8 x 8 pixels, a DCT of each block of the entire image is carried out, each block is quantized with reference to a quantization table, data of 1 bit is substituted for the quantized coefficient value, thus burying data in an image, a run length encoding and a Huffman encoding are sequentially done, and the value of the quantization table corresponding to the substituted coefficient value after the quantization is replaced with 1.</p> |
