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Abstract

A method is described to combine together at least two continuous tone digital images into a combined digital image. When viewed in the standard manner, the combined image appears to be the first of the two images. The second image cannot be seen. When the bits within each pixel of the combined image are reversed, i.e. the least significant bit (LAB) is exchanged with the most significant bit (MB), and the resultant image is viewed, then the second image is seen. In this way, one image can be hidden inside the noise bits of another image. The method is applied to color images by treating each color separation independently. The encoding of one image into the other, while maintaining good image quality is accomplished using two simultaneous error diffusion calculations to determine the single output value for each pixel.

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