Abstract

This article presents a novel iterative method of palette-based image steganography that minimizes the RMS error between an original image and its stego-image. The proposed method is based on a palette modification scheme, which can iteratively embed one message bit into each pixel in a palette-based image. In each iteration, both the cost of removing an entry color in a palette and the benefit of generating a new one to replace it are calculated. If the maximal benefit exceeds the minimal cost, a entry color is replaced. Experimental results show that the proposed method remarkably reduces the distortion of the carrier images (stego-images) to other palette-based methods.

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