Patent Document ID: 9743825
Application ID: 14579425
Patent Status: 1

Claim One:
1. An image processing apparatus for performing positioning between a plurality of spectral band images obtained by capturing images inside a lumen by using a plurality of rays of light having wavelength bands different from one another, the image processing apparatus comprising: a processor comprising hardware, wherein the processor is configured to: acquire the plurality of spectral band images; extract feature data for each spatial frequency band from each pixel in at least one spectral band image of the plurality of spectral band images; extract, for each spatial frequency band, a pixel area whose spatial frequency component is negative, from the at least one spectral band image, based on the feature data for each spatial frequency band extracted from each pixel in the at least one spectral band image; calculate, for each spatial frequency band, weights for enhancing a spatial frequency component in a spatial frequency band including information in which a pixel value profile is concave as compared with surrounding areas; and perform positioning between the plurality of spectral band images based on the weights for each spatial frequency band.