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High-Capacity Steganographic Method for Color Images using Progressive Pixel-Alignment

By adjusting the pixel-value of a host block, we design an effective steganographic method for color images. More specifically, based on a progressive pixel-alignment approach with two averages of the given block, a secret message can be embedded in a host image without apparent visual distortion. Our experiments indicate that the perceived quality generated by our proposed method is quite good, and the payload is larger than most existing techniques. Moreover, our proposed method maintains a certain degree of robustness; the marked images generated by our method are tolerant of manipulations such as color quantization, equalization, edge sharpening, inversion, JPEG, JPEG2000, noise addition, pixel truncation, winding, and zigzagging. This robustness is rarely found in the traditional techniques for color image steganography.