IMAGE PROCESSOR, IMAGE PROCESSING METHOD, PROGRAM, AND COMPUTER-READABLE STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To convert a photographic subject area into an optimum density range (or a luminance range) while maintaining desired density (or luminance) and contrast of an interest area.

SOLUTION: This image processor has: an input pixel value setting circuit 1111 setting at least two different input pixel values in the photographic subject area of an input image; an output pixel value setting circuit 1112 setting output pixel values respectively corresponding to the two different input pixel values; and a dynamic range conversion circuit 1113 performing processing for converting pixel values of part or the whole of the input image by use of a dynamic range conversion function wherein the input pixel values set in the input pixel value setting circuit 1111 become the output pixel values set in the output pixel value setting circuit 1112. At this time, the dynamic range conversion function is generated such that a gradient in one input pixel value of the input pixel values set in the input pixel value setting circuit 1111 becomes a predetermined value.

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