Contour free point operation for video skin tone correction
View Patent ↗A method for color tone correction is disclosed. The method generally includes the steps of (A) generating a plurality of first intermediate components by scaling a plurality of first color components towards a first ideal color, wherein the first color components (i) are for a first plurality of pixels in an input video signal and (ii) fall inside a first region of a color space, (B) generating a plurality of first corrected components by adjusting the first intermediate components such that a first mapping of the first color components to the first corrected components is both (i) continuous in the color space and (ii) non-overlapping in the color space and (C) generating an output video signal by combining the first corrected components with a plurality of unaltered color components, wherein the unaltered color components (i) are for a second plurality of the pixels and (ii) fall outside the first region.
1. A display device comprising:
a circuit configured to (i) generate a plurality of intermediate components by scaling a plurality of first color components of video towards an ideal color, wherein said first color components fall inside a region of a color space, (ii) generate a plurality of corrected components by adjusting said intermediate components such that a mapping of said first color components to said corrected components is continuous in said color space and (iii) generate an image that is color tone corrected by combining said corrected components with a plurality of second color components of said video that fall outside said region.
2. The display device according to claim 1 , wherein said display device comprises at least one of (i) a television, (ii) a digital television, (iii) a display and (iv) a digital display.
3. The display device according to claim 1 , wherein said circuit is further configured to separate said first color components from said second color components prior to generating said intermediate components.
4. The display device according to claim 1 , wherein said first color components comprise a plurality of blue components and a plurality of red components of said video.
5. The display device according to claim 1 , wherein said circuit is further configured to calculate at least one of (i) a shape of said region and (ii) a location of said region in said color space in response to a user adjustment.
6. The display device according to claim 1 , wherein said video is received in a signal formatted as at least one of (i) an EIA-770 signal, (ii) a High Definition Multimedia Interface signal, (iii) a Digital Video Interface signal, (iv) a BT.601 signal and (v) a BT.656 signal.
7. The display device according to claim 1 , wherein said circuit is further configured to (i) generate a plurality of blue corrected components of said corrected components and (ii) generate a plurality of red corrected components of said corrected components in response to said blue corrected components.
8. The display device according to claim 1 , wherein said region comprises at least one of (i) a skin tone region, (ii) a grass region, (iii) a water region and (iv) a sky region.
9. The display device according to claim 1 , wherein said region has a shape comprising at least one of (i) a rectangular shape, (ii) a triangular shape, (iii) an oval shape, (iv) a pie shape, (v) a hexagonal shape and (vi) an elliptical shape.
10. The display device according to claim 1 , wherein said circuit is further configured to maintain a plurality of luminance components of said video unchanged during said color tone correction.
11. A method for color tone correction in a display device, comprising the steps of:
(A) generating a plurality of intermediate components by scaling a plurality of first color components of video towards an ideal color, wherein said first color components fall inside a region of a color space;
(B) generating a plurality of corrected components by adjusting said intermediate components such that a mapping of said first color components to said corrected components is continuous in said color space; and
(C) generating an image that is said color tone corrected by combining said corrected components with a plurality of second color components of said video that fall outside said region.
12. The method according to claim 11 , wherein said display device comprises at least one of (i) a television, (ii) a digital television, (iii) a display and (iv) a digital display.
13. The method according to claim 11 , further comprising the step of:
separating said first color components from said second color components prior to generating said intermediate components.
14. The method according to claim 11 , wherein said first color components comprise a plurality of blue components and a plurality of red components of said video.
15. The method according to claim 11 , wherein further comprising the step of:
calculating at least one of (i) a shape of said region and (ii) a location of said region in said color space in response to a user adjustment.
16. The method according to claim 11 , wherein said video is received in a signal formatted as at least one of (i) an EIA-770 signal, (ii) a High Definition Multimedia Interface signal, (iii) a Digital Video Interface signal, (iv) a BT.601 signal and (v) a BT.656 signal.
17. The method according to claim 11 , wherein step (B) comprises the sub-steps of:
generating a plurality of blue corrected components of said corrected components; and
generating a plurality of red corrected components of said corrected components in response to said blue corrected components.
18. The method according to claim 11 , wherein said region comprises at least one of (i) a skin tone region, (ii) a grass region, (iii) a water region and (iv) a sky region.
19. The method according to claim 11 , wherein said region has a shape comprising at least one of (i) a rectangular shape, (ii) a triangular shape, (iii) an oval shape, (iv) a pie shape, (v) a hexagonal shape and (vi) an elliptical shape.
20. A display device comprising:
means for generating a plurality of intermediate components by scaling a plurality of first color components of video towards an ideal color, wherein said first color components fall inside a region of a color space;
means for generating a plurality of corrected components by adjusting said intermediate components such that a mapping of said first color components to said corrected components is continuous in said color space; and
means for generating an image that is color tone corrected by combining said corrected components with a plurality of second color components of said video that fall outside said region.