Patent ID: 9171222
Filing Date: 2015-10-27
Classification: G06K,G06T,H04N

Abstract:
1. An image processing device for tracking a subject included in a first image, in a second image captured after the first image, the image processing device comprising: a non-transitory memory storing a program; and a hardware processor that executes the program and causes the image processing device to operate as: a segmentation unit configured to divide the first image into a plurality of segments based on similarity in pixel values; an indication unit configured to indicate a position of the subject in the first image; a region setting unit configured to set, as a target region, a segment group including an indicated segment which is a segment at the indicated position; an extraction unit configured to extract a feature amount from the target region; and a tracking unit configured to track the subject by searching the second image for a region similar to the target region using the extracted feature amount, and wherein the region setting unit is configured to (i) calculate a value indicating image similarity to the indicated segment, for each of one or more segments which are among the plurality of segments and different from the indicated segment, (ii) determine, when the value calculated for the segment is greater than a threshold, the segment as a similar segment, and (iii) set a segment group forming one continuous region, as the target region, the segment group including the indicated segment and the similar segment, the extraction unit is configured to extract a feature amount for each segment included in the target region, the tracking unit is configured to search for a region similar to the target region by searching the second image for a region similar to the segment using the feature amount extracted from the segment, for each segment included in the target region, the tracking unit is configured to search the second image for a region similar to the segment using not only the feature amount extracted from the segment, but also a positional relationship between the segment and a segment having a distance closest to a centroid of the target region, and the distance corresponding to a value indicating a similarity between pixel values and positions of pixels of the segments, wherein the closer the distance to the centroid the higher the similarity between the pixel values and positions of pixels of the segments.