Patent ID: 9113133
Filing Date: 2015-08-18
Classification: G11B,H04N

Abstract:
1. A digital signal processing apparatus for detecting a vertical cut in a sequence of video images, comprising: a filter configured to receive a plurality of pixels comprising a current image, and for each pixel, to remove pixel values from each pixel of the current image that are a same value as those in a defined set of neighboring pixels to generating a filtered image, and to set a single current pixel bit to active for each pixel having a detail after being filtered; a frame delay element configured to cause a one frame delay for the current image resulting in a delayed image, each pixel of the delayed image having a delayed pixel bit with the same value status as the current pixel bit; an exclusive OR circuit configured to generate a changed pixel bit which is set to active when either but not both of the current pixel bit and the delayed pixel bit are set and cleared otherwise; a counter configured to generate a count of the number of active pixels in the current image, the delayed image, and the changed image; a multiplier configured to apply a weighting factor to the count of active pixels in the changed image, wherein a high weighting factor is applied when the count of active pixels in the current image is different from the count of active pixels in the delayed image, and wherein a low weighting factor is applied when the count of active pixels in the current image is similar to the count of active pixels in the delayed image; a comparator configured to compare the weighted count of active pixels in the changed image to a positive threshold and a negative threshold, wherein a positive bit is set when the positive threshold is met, wherein a negative bit is set when the negative threshold is met, and wherein a none bit is set when the neither the positive or negative threshold is met; and a series of delay elements configured to store each set of the positive bit, the negative bit, and the none bit from the comparator for each sequential images; and a detector configured to detect a defined pattern of positive bits, negative bits and none bits that are set in the series of delay elements, wherein the defined pattern indicates a vertical cut in the current video signal.