Patent ID: 7129989
Filing Date: 2006-10-31
Classification: H04N

Abstract:
1. A four-field motion adaptive de-interlacing method, comprising: receiving four fields of a field sequence, wherein said four fields in the order before and after are a first field, a second field, a third field and a fourth field, and each field of said field sequence is formed by the same plurality of pixel positions as the parity fields of said field under difference time and said pixel positions forms a plurality of scan lines; executing a motion detection for generating a motion detection result; generating a parity field difference sequence depending on said motion detection result; executing a 3:2 pull-downed detection for generating a 3:2 pull-downed result depending on said parity field difference sequence; and generating a de-interlacing result by a de-interlacing method depending on said 3:2 pull-downed result, wherein said motion detection comprising: dividing said third field into a plurality of original blobs, wherein each of said original blobs comprises a plurality of pixels, each said pixel is individually on one of said pixel positions; detecting a first blob of each said original blob, wherein each said first blob exists if there is at least one blob with a first difference smaller than a first threshold and said first blob is the blob with the corresponding position most close to said original blob, otherwise, said first blob does not exist, wherein said first difference is the difference of said blob itself and said original blob; evaluating a first vector of each said original blob, wherein said first vector is from the corresponding position of said first blob to the corresponding position of said original blob when said first blob exists, otherwise, said first vector does not exist; detecting a second blob of each said original blob, wherein said second blob locates in the center between the corresponding positions of said first blob and said original blob, wherein said second blob exists when a third blob of said original blob exists, otherwise, said second blob does not exist; detecting said third blob of each said original blob, wherein said third blob is at a distance of said first vector from said second blob, wherein said third blob exists when a second difference of said second blob and said third blob is smaller than said first threshold, otherwise, said third blob does not exist; and evaluating a motion vector of each said original blob, wherein said motion vector is from the corresponding position of said second blob to the corresponding position of said original blob when said second blob exists, otherwise, said motion vector does not exist.