Patent ID: 8405767
Filing Date: 2013-03-26
Classification: H04N

Abstract:
1. An image processing device, comprising: a field pair correlation acquisition part obtaining a correlation for a field group Gt formed of a field Ft of a timing t and five or more fields F(t−i) (i=1 to m, m≧5) which are continuous with the field Ft in time series in an input image for each field pair Pj (j=t to “t−m+2”) formed of two adjacent fields having the same attribute; and a first determination part determining the input image as a 2:2 pull-down image based on a determination condition, the determination condition being that a pattern in which the correlation of each of the field pairs of a first attribute changes along with a time direction matches a pattern in which the correlation of each of the field pairs of a second attribute changes along with the time direction, wherein the field pair correlation acquisition part obtains correlation information indicating existence of correlation for each pixel position for each field pair, and the first determination part determines a noted pixel position as a characteristic position having a characteristic of the 2:2 pull-down image based on a determination condition, the noted pixel position being each pixel position other than a pixel position in which the correlation information obtained for all the field pairs included in the field group Gt has the same value, the determination condition being that an arrangement pattern of the correlation information of the noted pixel position of each field pair having the same attribute as the field pair Pt along with the time direction matches an arrangement pattern of the correlation information of the pixel position of an upper next and/or a lower next of the noted pixel position of each field pair having different attribute from the field pair Pt along with the time direction, the image processing device further comprising: a counter calculating a total number of noted pixel positions determined as the characteristic position for the field group Gt as a total number of characteristic positions St; and a second determination part determining the input image in which a difference or a ratio of the two total number of characteristic positions St obtained for two continuous field groups Gt (t=“m+1” to “m+2”) is equal to or larger than a predetermined threshold value as the 2:2 pull-down image; wherein each of the field pairs of the first attribute are one of an even field and an odd field, and each of the field pairs of the second attribute are the other of an even field and an odd field.