Image processing system and image processing method

An image processing method which a computer executes which comprising:

• using a dictionary for storing data of plural pairs associating deteriorated patches which are patches from a deteriorated image formed by deteriorating a prescribed image, and restoration patches which are patches from said prescribed image;
• calculating, as a degree of similarity between plural input patches generated by dividing an input image which is input and said deteriorated patches, a weighted degree-of-similarity which is a degree-of-similarity between weighted deteriorated patches and weighted input patches in which forms of said deteriorated patches and said input patches are reconfigured using a patch weight which is continuous weight;
• selecting, on the basis of said weighted degree-of-similarity, a restoration patch for each input patch;
• combining said restoration patches, each of which is selected for each input patch, to generate a restored image;
• and
• determining the patch weight on the basis of a degree of risk which is calculated for each of plural patch weights and which is a ratio of a degree of similarity between said deteriorated patches to a degree of similarity between said restoration patches which are corresponding to said deteriorated patches.

A non-transitory computer-readable recording medium recording an image processing program which makes a computer execute:

• a process of using a dictionary for storing data of plural pairs associating deteriorated patches which are patches from a deteriorated image formed by deteriorating a prescribed image, and restoration patches which are patches from the prescribed image, and calculating, as a degree of similarity between plural input patches generated by dividing an input image which is input and said deteriorated patches, a weighted degree-of-similarity which is a degree-of-similarity between weighted deteriorated patches and weighted input patches in which forms of said deteriorated patches and said input patches are reconfigured using a patch weight which is continuous weight;
• a process of selecting, on the basis of said weighted degree-of-similarity, a restoration patch for each input patch;
• a process of combining said restoration patches, each of which is selected for each input patch, to generate a restored image;
• and
• a process of determining the patch weight on the basis of a degree of risk which is calculated for each of plural patch weights and which is a ratio of a degree of similarity between said deteriorated patches to a degree of similarity between said restoration patches which are corresponding to said deteriorated patches.