Patent ID: 9595116
Date: 2017-03-14
CPC Classifications: A61B,G06K,G06T

Claim:
1. A body motion detection device comprising: a processor that: calculates a contrast of a high frequency component and a contrast of a low frequency component of a radiographic image at each of a plurality of analysis points contained in the radiographic image, the analysis points being set for calculation of the contrast of the high frequency component and the contrast of the low frequency component, wherein processor generates, from the radiographic image, a high frequency image containing the high frequency component and a low frequency image containing the low frequency component, determines, at each analysis point on each of the high frequency image and the low frequency image, a gradient direction of an edge portion contained in an analysis region with the analysis point being the center, and calculates a contrast along the gradient direction of each of the high frequency image and the low frequency image as the contrast of the high frequency component and the contrast of the low frequency component; calculates a ratio of the contrast of the high frequency component to the contrast of the low frequency component for the gradient direction determined at each of the analysis points; and determines a smallest ratio among ratios calculated for the gradient directions as an index value indicating a body motion, and determining whether or not there is a body motion of a subject contained in the radiographic image based on a result of statistical processing of the index values at the analysis points.