DEVELOPMENT AND CODE REALIZATION OF DIGITAL IMAGE WATERMARKING METHOD, ROBUSTING TO JPEG COMPRESSION, BASED ON KOCH-ZHAO ALGORITHM
The algorithm of the digital image watermarking, that is modification of well-known al-gorithm of Koch E., Zhao J., is offered in this work. The program is worked out in algo-rithmic language C++, realizing this algorithm. The algorithm has been tested on ro-bustness against a row of the most widespread attacks which may occur in the process of image transmission and, in particular, large attention was devoted to stability of algorithm in relation to such attack as JPEG compression.
Keywords: digital image watermarking, digital watermark, Discrete Cosine Transform (DCT), Inverse Discrete Cosine Transform (IDCT), JPEG compression, Peak Signal-to-Noise Ratio ( PSNR), Normalized Correlation Coefficient (NC)