Tian Zhiwei, Wu Huizhen. Enhancement and detection ot difference-information between two photographs[J]. Chinese Journal of Lasers, 1987, 14(7): 424
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By utilizing the black-white synthetic PN (positive-negative) photograph for detection of difference-information between two photographs, the difference-information which is always immersed in the strong do component after the processing will now be selected and appeared due to the psendo-colour enhancement. As we make y=+l for the copy from the negative photograph, a wider dynamic range of H-D curve is provided.