Efficient Technique for Image Stenography Based on coordinates of pixels

Abstract

A novel data hiding scheme in digital images with the diamond encoding by pixel value adjustment is proposed. The proposed method is the extension of the diamond encoding embedding scheme. First, choosing the cropped region from given cover image select 4 pixel pairs from cropped region, and one secret k-ary digit is concealed into the diamond characteristic value. The diamond characteristic value is modified to secret digit and it can be obtained by adjusting pixel values in a block. Here embedding parameter k, and the block capacity is equal to log2(2k2 + 2k + 1). The diamond encoding provides an easy way to produce a more perceptible result than those yielded by simple least-significant-bit substitution methods. The embedded secret data can be extracted without disturbing the original cover image. Experimental results have demonstrated that the proposed method is capable of hiding more secret data while keeping the stego-image quality degradation imperceptible.