| 摘要 |
PROBLEM TO BE SOLVED: To determine whether an image which is picked up is a back light scene or not, through the use of digital image data picked up by a digital camera and a scanner. SOLUTION: An input image is divided into a plurality of regions 1-1 to 1-8, and lightness is obtained for each area. A first determination is executed based on the number of areas having the lightness of not less than a prescribed threshold. When a back light scene is determined in the first determination, color saturation distribution is obtained from whole image data and second determination is executed based on the color saturation distribution. Since the color saturation of the overall image is low and the color saturation distribution is concentrated on a small value in the case of real back light, lightness information and the color saturation information are used. Thus, the real back light scene can be discriminated from a case, when a dark part exists in a part of the image. |
