Patent ID: 8687852

Claim:
A motion detection device, which receives a signal indicative of a moving image constituted by temporarily consecutive frames and detects motion between the frames with respect to each block region consisting of one or a plurality of adjacent pixels constituting each frame, the motion detection device comprising: difference calculation means for calculating a difference signal indicative of a difference between adjacent two frames; first high frequency component calculation means for calculating, with respect to said each block region, a first high frequency component included in one of the two frames; second high frequency component calculation means for calculating, with respect to said each block region, a second high frequency component included in the other of the two frames; third high frequency component calculation means for calculating, with respect to said each block region, a third high frequency component by adding a product of the first high frequency component and a first coefficient to a product of the second high frequency component and a second coefficient; and division means for calculating, with respect to said each block region, a motion signal by dividing the difference signal by the third high frequency component, motion being detected when the motion signal in said each block region is larger than a predetermined threshold.