Multi-directional comb filtering in a digital video decoder
AssigneeWZ Technology Inc.
InventorsSheng De Jang, Hsiu Min Wong, Zu Jun Liang, Qing Yang
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Abstract
A multi-directional comb filtering in a digital video decoder is provided. Some embodiments of the present invention provide for a method of filtering, using a multi-directional comb filter, pixel data from a sequence of fields of pixel data, wherein the fields of pixel data comprise a previous field, a current field and a next field, and wherein each of said fields includes a previous line, a current line, a next line.
Claims10
A method of filtering, using a multi-directional comb filter, pixel data from a sequence of fields of pixel data, wherein the fields of pixel data comprise a previous field, a current field and a next field, and wherein each of said fields includes a previous line, a current line, a next line, the method comprising:
- determining a temporal chrominance velocity (K—3dcomb) relative to a pixel position of the current field, wherein the temporal chrominance velocity (K—3dcomb) is determined as one or more of:
- (1) C—3dcomb_p/(C—3dcomp_p+C—3dcomb_n), wherein C—3dcomb_p=(cvbs_c−cvbs_p), wherein cvbs_c comprises a second video signal value for the pixel position on the previous field and wherein cvbs_p comprises a first video signal value for the pixel position on the current field;
- and
- (2) C—3dcomb_n/(C—3dcomp_p+C—3dcomb_n), wherein C—3dcomb_n=(cvbs_c−cvbs_n), wherein cvbs_n comprise a third video signal value for the pixel position on the next field;
- and
- determining a temporal luminance based on:
- (1) the first video signal value;
- (2) the second video signal value;
- (3) the third video signal value;
- and
- (4) the temporal chrominance velocity.
A multi-directional comb filter for filtering pixel data from a sequence of fields of pixel data, wherein the fields of pixel data comprise a previous field, a current field and a next field, and wherein each of said fields includes a previous line, a current line, a next line, the multi-directional comb filter comprising:
- means for determining a temporal chrominance velocity (K—3dcomb) relative to a pixel position of the current field, wherein the temporal chrominance velocity (K—3dcomb) is determined as one or more of:
- (1) C—3dcomb_p/(C—3dcomp_p+C—3dcomb_n), wherein C—3dcomb_p=(cvbs_c−cvbs_p), wherein cvbs_c comprises a second video signal value for the pixel position on the previous field and wherein cvbs_p comprises a first video signal value for the pixel position on the current field;
- and
- (2) C—3dcomb_n/(C—3dcomp_p+C—3dcomb_n), wherein C—3dcomb_n=(cvbs_c−cvbs_n), wherein cvbs_n comprise a third video signal value for the pixel position on the next field;
- and
- means for determining a temporal luminance based on:
- (1) the first video signal value;
- (2) the second video signal value;
- (3) the third video signal value;
- and
- (4) the temporal chrominance velocity.
Dependencies are inferred from the claim text.