A zeros-watermarking algorithm based on chaotic system and DCT

In order to protect the copyright of the image in the condition of the image quality, it propose a kind of the image zeros watermarking based on chaotic system and DCT. The original image is divided into blocks and DCT for each block, Logistic mapping is used to find the hiding position information to extract DC, which are used to construct zeros-watermark. Binary image is selected as watermark image so that the watermarks of existing zeros watermarking algorithm are no longer invisible and meaningless and watermark security is also analyzed. The experimental result based on this algorithm have shown that the watermarking is robust to the common signal processing techniques including JPEG compressing, adding noise, low pass filter, median filter, cropping and so on.