The image information hiding method based on (T, N) threshold hides a smaller image file or other special hidden digital files into the n images which are larger ones. It achieves the purpose of information hiding using the image information redundancy of human. We must get more than T carrier images at least which have loaded the information of the hidden image if we want to restore the information. The T is the threshold. The image information hiding method based on (T, N) threshold has a greater enhancement than traditional method in fault tolerance and safety. In this paper, the concept of pixel item which contains T bytes or T pixels has been proposed. Pixel item is used as the basic unit of information processing, and reduces the computational greatly.
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