Methods and Systems for Image Enhancement
First Claim
Patent Images
1. A method for adjusting image characteristics, said method comprising:
- a) processing an image to create a low-pass (LP) image and a high-pass (HP) image;
b) detecting skin-color regions in said LP image;
c) creating a skin-color map of said skin-color regions;
d) refining said skin-color map; and
e) differentially processing said LP image wherein a skin-color region identified with said skin-color map is processed differently than a non-skin-color region, thereby creating a color-enhanced LP image.
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Abstract
Embodiments of the present invention relate to systems and methods for image enhancement. Some embodiments comprise color detection, color mapping and differential processing based on color characteristics. Some embodiments comprise tonescale processing. Some embodiments comprise application of dither pattern noise to an image to reduce contouring artifacts.
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Citations
21 Claims
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1. A method for adjusting image characteristics, said method comprising:
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a) processing an image to create a low-pass (LP) image and a high-pass (HP) image; b) detecting skin-color regions in said LP image; c) creating a skin-color map of said skin-color regions; d) refining said skin-color map; and e) differentially processing said LP image wherein a skin-color region identified with said skin-color map is processed differently than a non-skin-color region, thereby creating a color-enhanced LP image. - View Dependent Claims (2, 3, 4, 5)
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6. A method for adjusting image characteristics, said method comprising:
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a) processing an image to create a low-pass (LP) image and a high-pass (HP) image; b) applying a tonescale operation to said LP image thereby creating an adjusted LP image; c) combining said adjusted LP image with said HP image thereby creating a combined, adjusted image; and d) combining said combined, adjusted image with a dither pattern array that is temporally high-pass and spatially high-pass thereby creating a combined, dither-enhanced image. - View Dependent Claims (7, 8, 9)
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10. A method for adjusting image characteristics, said method comprising:
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a) processing an image to create a low-pass (LP) image and a high-pass (HP) image; b) detecting skin-color regions in said LP image; c) creating a skin-color map of said skin-color regions; d) refining said skin-color map; and e) differentially processing said LP image wherein a skin-color region identified with said skin-color map is processed differently than a non-skin-color region, thereby creating a color-enhanced LP image. f) applying a tonescale operation to said color-enhanced LP image thereby creating an adjusted LP image; and g) combining said adjusted LP image with said HP image thereby creating a combined, adjusted image. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification