G - Physics – 06 – T
Patent
G - Physics
06
T
350/33, 379/4, 3
G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/28 (2006.01) H04N 7/36 (2006.01)
Patent
CA 1308486
ABSTRACT VIDEO IMAGE PROCESSING A video processor identifies the head from a head against background scene using Vector Quantisation operating on a composite vector codebook including "head" vectors and "background" vectors. The codebook is initially derived by storing several frames of an image training sequence (1); diffferencing adjacent frames (2); thresholding the difference data against a luminance threshold (3); median filtering (4); clustering the data sets (5); determining the minimum rectangle which will contain all the remaining non-zero pels (6); generating a border around the rectangles (7); generating a head codebook from the pels of the original frames of the image that fall within the borders (8); s similarly generating a background codebook; and finally generating a composite codebook (9) in which "head" and "background" vectors are distinguished by flags. Then the head is tracked by Vector Quantising (10) the image with this codebook (9); and analysing the flags (11) (12) to obtain the head position (13).
566156
British Telecommunications Public Limited Company
G. Ronald Bell & Associates
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