Patent ID: 8218888

Claim:
A motion blur detector comprising: a delay unit for generating a first image signal with no frame delay with respect to an input image signal, a second image signal with a delay of a first predetermined number of frames with respect to the input image signal, and a third image signal with a delay of the first predetermined number of frames with respect to the second image signal; a first difference detector gradation differences between the first image signal and the second image signal; a second difference detector for detecting gradation differences between the second image signal and the third image signal; a third difference detector for detecting gradation differences between the first image signal and the third image signal; a differentiator for detecting signal changes between adjacent pixels in the gradation differences detected by the third difference detector; a transition period detector for detecting gradation changes between adjacent pixels in the second image signal, and using the gradation changes to detect gradation transition periods in the image signal; and a blur determiner for detecting motion blur periods based on the gradation differences detected by the first difference detector, the gradation differences detected by the second difference detector, differentiation results detected by the differentiator, and the gradation transition periods in the second image signal detected by the transition period detector.