The regression point acquisition unit (4) refers to the first optical flow from the image (A) to the image (B) and the second optical flow from the image (B) to the image (A). Get the coordinates of the regression point that is the end point of the optical flow of. The accuracy calculation unit (5) calculates the accuracy (P) of the optical flow based on the difference between the coordinates of the starting point of the first optical flow and the coordinates of the regression point acquired by the regression point acquisition unit (4).
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