Patent ID: 8514294
Filing Date: 2013-08-20
Classification: G03B,G06T,H04N

Abstract:
1. An image tracking apparatus comprising: an imaging unit that repeatedly captures an image formed through an imaging optical system to generate a photographing image; a calculation unit that sets a first search region and a second search region other than the first search region in the photographing image, calculates a first calculation result indicating correlation between image information on the first search region and reference information based on a target image, and calculates a second calculation result indicating correlation between image information on the second search region and the reference information; a detection unit that detects a position of the target image in the photographing image based on either one of the first calculation result and the second calculation result; and a first determination unit that determines whether or not a difference between the first calculation result and the second calculation result exceeds a first threshold value, wherein: the calculation unit sets the first search region as a region larger than the second search region, and the detection unit detects the position of the target image based on the first calculation result when the difference exceeds the first threshold value or based on the second calculation result when the difference is less than the first threshold value.