Colour Image Steganography based on Pixel Value Differencing in Spatial Domain

Abstract

Steganography is the only answer for secure and secret communication. Existing methods in image steganography focus on increasing embedding capacity of secret data. According to existing methods, the experimental results indicate that two pixels are required for one secret digit embedding. In direction of improve the embedding size of secret data, a novel method of Pixel Value Modification (PVM) by modulus function is proposed. The proposed PVM method can embed one secret digit on one pixel of cover image. Thus, the proposed PVM method gives good quality of stego image. The experimental outputs validate that good visual perception of stego image with more secret data embedding capacity of stego image can be achieved by the proposed method.