Image processing apparatus, ophthalmologic imaging apparatus, image processing method, and storage medium

Abstract

An image processing apparatus includes an identification unit configured to identify periodicity of a fundus image obtained by capturing an image of a fundus of an eye, and an information acquisition unit configured to acquire information indicating an imaging state of photoreceptor cells in the fundus image based on the periodicity.

What is claimed is: 
     
         1 . An image processing apparatus comprising:
 a conversion unit configured to acquire a frequency image by performing conversion of a fundus image obtained by capturing an image of a fundus of an eye;   an extraction unit configured to extract a feature amount from the frequency image; and   an information acquisition unit configured to acquire information indicating a periodicity of an arrangement of photoreceptor cells in the fundus image based of the extracted feature amount.   
     
     
         2 . The apparatus according to  claim 1 , further comprising a segmentation unit configured to segment the fundus image into a plurality of partial images,
 wherein the conversion unit obtains partial frequency images by performing conversion on each of the plurality of partial images,   wherein the extraction unit extracts the feature amount from each of the partial frequency images, and   wherein information acquisition unit acquires the information indicating the information of each of the plurality of partial images.   
     
     
         3 . The apparatus according to  claim 2 , wherein the information acquisition unit acquires, based on the feature amount corresponding to each partial image, information about a partial image including a region from which photoreceptor cells are not extracted. 
     
     
         4 . The apparatus according to  claim 1 , wherein the extraction unit extracts a peak value of luminance of a ring structure of the frequency image as the feature amount. 
     
     
         5 . The apparatus according to  claim 1 , wherein the extraction unit extracts a sharpness of a ring structure of the frequency image as the feature amount. 
     
     
         6 . The apparatus according to  claim 1 , further comprising an output unit configured to output the information indicating the periodicity. 
     
     
         7 . The apparatus according to  claim 6 , wherein the output unit causes a display unit to display the fundus image and the information indicating the periodicity. 
     
     
         8 . The apparatus according to  claim 6 , wherein the output unit outputs a control value corresponding to the feature amount to an imaging apparatus configured to capture the fundus image. 
     
     
         9 . The apparatus according to  claim 1 , further comprising an adapted optics scanning laser opthalmoscope configured to capture the fundus image. 
     
     
         10 . An image processing method comprising:
 obtaining a frequency image by performing conversion of a fundus image obtained by capturing an image of a fundus of an eye;   extracting a feature amount from the frequency image; and   acquiring information indicating a periodicity of an arrangement of photoreceptor cells in the fundus image based of the extracted feature amount.   
     
     
         11 . Anon-transitory computer-readable storage medium storing computer-executable instructions for causing a computer to execute the image processing method according to  claim 10 .