Abstract
In this paper, two simple information hiding techniques for color images in the spatial domain and the frequency domain are proposed. In the spatial domain, we divide the original image into 2x2 sub-blocks and check each sub-block if it has an edge point. If yes, we embed more data in this sub-block and blue channel. In the frequency domain, the proposed mechanism modifies the standard quantization table first. Then the data is hidden in the cover-image with its quantized DCT coefficients modified. We compare our method with other methods and a JPEG hiding-tool Jpeg–Jsteg. From the experimental results, we obtain that the proposed methods has a larger data hiding capacity than other methods and Jpeg–Jsteg, and the quality of the stego-images of our methods is acceptable.