Method of detecting boundary structures in a video signal

Details Method of detecting boundary structures in a video signal Method of detecting boundary structures in a video signal

H - Electricity

04

N

350/33

H04N 1/41 (2006.01) G06T 5/00 (2006.01) G06T 9/00 (2006.01) H04N 1/409 (2006.01)

Patent

CA 1278373

27371-153 ABSTRACT OF THE DISCLOSURE A method of detecting edge structures in a video signal, with a decision criterion being derived from the environment pixels of an image pixel so as to realize image coding with the least number of bits possible. The object of detecting all of the oblique edges, i.e edges which are not horizontal, vertical is accomplished in that an average is formed from the environment pixels of an image pixel and this average is then compared with each environment pixel so as to obtain an output signal having one of three-values (1, 0, -1) depending on whether the luminance or chrominance values of the particular environment pixel is above, within or below a given tolerance range. A conclusion as to the existence of an edge and its orientation is then drawn from the number of immediately con- secutive identical positive or negative values (1 or -1) of this possible three-valued signal for an image pixel and from the position of the changes in value within the sequence of environ- ment pixels.

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