Gray-scale transformation processing device, electronic camera, and gray-scale transformation program

摘要

The present invention provides a gray-scale transformation processing device which reduces the memory capacity for an LUT, and carries out gray-scale transformation with high accuracy. The gray-scale transformation processing device includes a data dividing unit, a lookup table, a transform function generating unit, and a gray-scale transforming unit. The data dividing unit divides digitally inputted image data into high-order bits data and low-order bits data. In the lookup table, the correspondences between the high-order bits data and correction coefficient groups providing transformation curves, respectively, are stored. The transform function generating unit generates a high-order gray-scale transform function from the correction coefficient group obtained from the lookup table. The gray-scale transforming unit calculates the low-order bits data with the gray-scale transform function to output image data, which has been subjected to gray-scale transformation.