Feature extraction apparatus, feature extraction program, and image processing apparatus

摘要

Provided is a feature extraction device including a sub region setting unit (433) which sets a plurality of sub regions with respect to a pixel of interest, and a binary pattern generation unit (434) which generates a local binary pattern indicating pixel value comparison results relative to each sub region with respect to each pixel of interest. The sub region setting unit (433) sets (436) a region constituted by a plurality of pixels including a pixel separated from the pixel of interest as a sub region, and the binary pattern generation unit (434) calculates (437) a representative value for each sub region and generates (439) a local binary pattern indicating whether or not the difference (438) between the representative value and the value of the pixel of interest is equal to or larger than a predetermined threshold value.

主权项

1. A feature extraction apparatus comprising:
a sub-region setting section that sets all or some pixels in an image taken by a camera to be pixels of interest, respectively, and that sets a plurality of sub-regions with respect to each of the pixels of interest based on spatial frequency characteristics of the camera; and a binary pattern generating section that generates a local binary pattern for each of the pixels of interest, the local binary pattern indicating comparison results between a pixel value of the pixel of interest and pixel values of the plurality of set sub-regions using bit values, wherein the plurality of sub-regions include at least a sub-region constituted by a plurality of pixels including a pixel separated from a corresponding one of the pixels of interest by one or more pixels, and at least one of a width and a length of the sub-region is equal to or less than the number of pixels equivalent to the reciprocal of the maximum value of a spatial frequency of the camera.