IMAGE PROCESSING APPARTATUS AND METHOD, RECORDING MEDIUM STORING IMAGE PROCESSING PROGRAM READABLE BY COMPUTER, AND IMAGING APPARATUS

摘要

An image processing apparatus includes a degree-of-degradation detector, a degree-of-degradation estimation unit, a correction system selector and a gradation correction unit. The degree-of-degradation detector detects a degree of degradation of an image data. The degree-of-degradation estimation unit estimates a dispersion of the degree of degradation in the image data. The correction system selector selects either a first gradation correction system or a second gradation correction system in accordance with the dispersion of the degree of degradation. The gradation correction unit performs gradation correction of the image data based on either the selected first or second gradation correction system.

主权项

1. An image processing apparatus comprising:
a degree-of-degradation detector which detects a degree of degradation from values of color channels in each of areas including a pixel of interest in image data, the degree of degradation indicating an unclearness in each of the areas, and the image data comprising pieces of pixel data including the color channels; a degree-of-degradation estimation unit which estimates a dispersion of the degree of degradation in the image data; a correction system selector which selects either a first gradation correction system or a second gradation correction system in accordance with the dispersion of the degree of degradation; and a gradation correction unit which performs gradation correction of the image data based on either the selected first or second gradation correction system, wherein the first gradation correction system performs adaptive gradation correction based on the degree of degradation of each of the areas of the image data, the second gradation correction system performs uniform gradation correction for entirety of the image data, and the correction system selector selects the first gradation correction system when the dispersion of the degree of degradation is equal to or more than a predetermined value, and selects the second gradation correction system when the dispersion of the degree of degradation is less than the predetermined value.