1Department of Computer Engineering, Babol Branch, Islamic Azad University, Babol, Iran
2Department of Computer Engineering, Sari Branch, Islamic Azad University, Sari, Iran
Watermarking refers to the science behind hiding important data so that the primary data don’t get lost and remain hidden. The hiding process in watermarking is robust against exploratory processes to extract the primary data. The current research aims to increase robust potential against hacking the primary data using chaos approach .In this respect, an algorithm is presented to insert watermark signal using chaos theorem functions applying DWT, DCT, DFT and SVD transforms induced coefficients or their combinations for embedding the desired data in different ways. In this method, the image is divided into 8×8 blocks and each block is transferred to DCT cosine transform domain and the watermarked bits are embedded in the intermediate coefficients of this image DCT. Once DCT transform is applied except the first value which is DC, there are also 63 ACs not all of which are significant and they can increase or decrease .In zigzag scan, high and low frequencies are highly important since they include the image overview and details, while the middle values are less critical and can be displaced and applied for watermarking algorithm embedding.