Patent ID: 7580158
Filing Date: 2009-08-25
Classification: G06T,H04N

Abstract:
1. An image processing apparatus comprising: a correction amount calculation means for calculating a correction amount to be added to each pixel of an image to compress a dynamic range of the image by referring to a compression table that defines a relationship between the density of each pixel of the image and the compression amount for compressing the dynamic range of the image; a processing means for obtaining a processed image of which the dynamic range has been compressed by performing processing for compressing the dynamic range of the image by adding the correction amount to each pixel of the image; and a judgment means for judging whether an estimated change amount of the image by the processing for compressing the dynamic range, the estimated change amount being obtained from the compression table, is larger than a predetermined threshold value, wherein if the judgment is YES, the correction amount calculation means produces an unsharp image of the image and calculates the correction amount by using the unsharp image and by referring to the compression table, or if the judgment is NO, the correction amount calculation means calculates the correction amount by using the image instead of the unsharp image and by referring to the compression table.