Patent ID: 7991232

Claim:
An image similarity calculation system for calculating an image similarity between an inquiry image and a reference image, comprising one or more processors implementing the steps of: an editing probability estimation unit configured to compute a value X corresponding to a probability for an editing process to be applied to an image for each local region, based on either a learning image or a device characteristic input to the editing probability estimation unit; a local region weight calculation unit configured to calculate an image-region-based weight value based on the probability for the editing process output by the editing probability estimation unit; a feature quantity extraction unit configured to extract a feature quantity for each divided small region of the inquiry image; and an image similarity calculation unit configured to calculate the image similarity between the inquiry image and the reference image by comparing the feature quantity for each divided small region of the inquiry image with a feature quantity for each divided small region of the reference image, using the image-region-based weight value output by the local region weight calculation unit.