Patent Document ID: 8063920
Application ID: 11576911
Patent Status: 1

Claim One:
1. A method for reducing motion blur of images shown sequentially on non-stroboscopic display devices, in which local areas p i of an image of a video signal are displayed during respective local display times t i that are less than or equal to an image period T, comprising: determining, via a spatial high pass filter, an amount X i of high spatial frequency content related to a respective local area p i of said image of said video signal, wherein the respective local area p i represents a group of adjacent pixels of said image; determining, via a frame memory or a temporal low-pass filter, an amount of temporal differences in said respective local area p i of two subsequent images of said video signal, in which the amount of temporal differences is representative of (i) a course measure of an amount of motion, but not a direction of the motion, of objects in an image, from one image to a next image, wherein determining the amount of temporal differences comprises (i) subtracting corresponding pixels of corresponding local areas p i in two subsequent images of said video signal or (ii) by temporal low-pass filtering said video signal; and adjusting, via a duty-cycle adjustment instance, a local display time t i corresponding to the respective local area p i in dependence on (a)(i) said determined amount X i of high spatial frequency content related to the respective local area p i and (a)(ii) said determined amount of temporal differences, wherein said local display time t i corresponding to the respective local area p i is only decreased with (b)(i) the determined amount X i of high spatial frequency content for the respective local area p i increasing within a given range of high spatial frequency content levels and (b)(ii) the determined amount of temporal differences being above a temporal differences threshold amount, wherein the temporal differences threshold amount is representative of course information about motion of objects in said image, from one image to a next image, sufficient for motion blur to occur, further wherein adjusting, by decreasing the local display time t i is avoided in an absence of motion blur.