METHOD, DEVICE AND PROGRAM FOR EMBEDDING DIGITAL WATERMARK FOR TAMPERING DETECTION, METHOD, DEVICE AND PROGRAM FOR DETECTING TAMPERING USING THE DIGITAL WATERMARK, AND RECORDING MEDIUM WITH THE PROGRAM RECORDED THEREIN

摘要

PROBLEM TO BE SOLVED: To provide a method of embedding a digital watermark for tampering detecting capable of embedding the digital watermark without spoiling appearance to detect tampering of a video.;SOLUTION: Each processing of YCbCr conversion, downsampling, DCT, and DCT coefficient quantization in a normal JPEG coding process is performed to the input video (S31, S32), redundancy is given to digital watermark data to be made into error detection code data (S33, S34), the data is made into encrypted code data by a predetermined encryption method (S35), for example, selected DCT blocks of two color components are grouped (S36, S37), the encrypted code data is embedded in a DCT block belonging to each block (S41), entropy compression is performed to a quantization coefficient after completion of embedding similar to the JPEG coding process, the quantization coefficient is shaped so as to conform to a predetermined JPEG format to complete the JPEG coding (S42, S43).;COPYRIGHT: (C)2010,JPO&INPIT