ELECTRONIC WATERMARK EMBEDDING APPARATUS FOR JEPG IMAGE AND JPEG IMAGE RESTORATION DEVICE

摘要

PPROBLEM TO BE SOLVED: To embed an electronic watermark in a JPEG image and to restore image data prior to embedding the watermark. PSOLUTION: An electronic watermark embedding apparatus for a JPEG image includes: a quantization factor value search section for searching for a quantization factor (CSBm/SB) of which the quantization factor value first becomes a value other than 0, in a predetermined searching order from a quantization factor of a highest frequency component to a quantization factor of a lower frequency component; an electronic watermark information embedding section which designates a quantization factor CSBp/SBthat is searched just before the quantization factor CSBm/SBof which the quantization factor value first becomes any value other than 0, as a quantization factor to be embedded, designates a quantization factor CSBkh/SBof the highest frequency component in a case where the quantization factor of which the quantization factor value is 0 is not present, and embeds electronic watermark information or electronic water mark missing information in the designated quantization factor (CSBp/SBor CSBkh/SB); and an entropy coding section for performing entropy coding processing on a quantization factor block in which the electronic watermark information or the electronic watermark missing information is embedded. PCOPYRIGHT: (C)2009,JPO&INPIT