Patent ID: 8798373
Filing Date: 2014-08-05
Classification: G06K,G06T,H04N

Abstract:
1. An image restoration system comprising: hardware including a processor; a defect pixel value estimation unit implemented at least by the hardware and that estimates a pixel value which each pixel in a defect region as a region to be restored in an image may take, based on a pixel value of pixels in a non-defect region as a region in the image not including the defect region; a patch selection unit implemented at least by the hardware and that selects a pair of patches in which a defect patch and a reference patch are most similar to each other from among the pairs of patches including the defect patch as an image of a region including the defect region and the reference patch as an image of a region not including the defect region; and an image restoration unit implemented at least by the hardware and that restores the defect patch based on the reference patch in the selected pair of patches, wherein a patch selection function is expressed as a product or sum of at least two types of functions, one type of function is a function which takes a smaller value as a luminance gradient of the defect patch candidate is larger, and another type of function is a function which takes a smaller value as the image of the defect patch candidate and the image of the reference patch candidate are more similar to each other, and the patch selection unit selects a pair of patches having smaller value of the patch selection function as a pair of patches to be restored based on a relationship between an estimated pixel value of a defect region in the defect patch and a pixel value of the corresponding reference patch.