| 摘要 |
When the gray processing section converts input image data into gray image data, the histogram generating section generates a histogram that represents the distribution of the number of pixels of the gray image data. Then, based on the gray level of a target pixel and the gray levels of a plurality of neighbor pixels surrounding the target pixel in the shape of an approximate circumference, rotation-invariant features indicating local texture feature centering on the target pixel are calculated for each of the pixels, and a histogram is generated based on the calculated feature. Thereafter, the search section searches for similar image data based on the histogram of the registration image data and the histogram of the input image data, and the display section displays the result of search.
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