Modifying color and panchromatic channel CFA image
View Patent ↗A method of modifying a CFA image or full-color image having a plurality of color channels and a panchromatic channel, includes capturing the panchromatic channel at a different exposure time than at least one of the color image channels with the CFA sensor within one image; producing a panchromatic edge map and a color edge map from the CFA image; using the panchromatic edge map and the color edge map to provide motion estimates; and using the motion estimates to modify at least one of the channels of the CFA image or full-color image.
1. A method of modifying a CFA image or full-color image having a plurality of color channels and a panchromatic channel, comprising:
(a) capturing the panchromatic channel at a different exposure time than at least one of the color image channels with the CFA sensor within one image;
(b) producing a panchromatic edge map and a color edge map from the CFA image;
(c) using the panchromatic edge map and the color edge map to provide motion estimates; and
(d) using the motion estimates to modify at least one of the channels of the CFA image or full-color image.
2. The method of claim 1 , wherein step (b) further includes
(a) producing a blurred panchromatic CFA image from the CFA image;
(b) producing an edge gradients map from the blurred panchromatic CFA image;
(c) producing an edge gradients and magnitude map from the edge gradients map;
(d) producing a thinned edge map from the edge gradients and magnitude map; and
(e) producing the panchromatic edge map from the thinned edge map.
3. The method of claim 1 , wherein step (b) further includes
(a) producing an RGB CFA image from the CFA image;
(b) producing a blurred RGB CFA image from the RGB CFA image;
(c) producing an edge gradients map from the blurred RGB CFA image;
(d) producing an edge gradients and magnitude map from the edge gradients map;
(e) producing a resized edge gradients and magnitude map from the edge gradients and magnitude map;
(f) producing a thinned edge map from the resized edge gradients and magnitude map; and
(g) producing the color edge map from the thinned edge map.
4. The method of claim 1 , wherein step (c) further includes
(a) producing a cross-correlation map from the panchromatic edge map;
(b) producing block motion estimates from the cross-correlation map; and
(c) producing the motion estimates from the block motion estimates.
5. The method of claim 1 wherein step (d) further includes using the motion estimates to modify the panchromatic channel of the CFA image or full-color image.