Systems and Methods for Brightness Preservation using a Smoothed Gain Image
First Claim
Patent Images
1. A method for adjusting image code values, said method comprising:
- a) receiving a low-pass version of an input image;
b) determining a low-pass gain process for said low-pass image;
c) creating a low-pass gain image based on said low-pass gain process;
d) spatially smoothing said low-pass gain image;
e) applying said smoothed, low-pass gain image to said low-pass image thereby creating an enhanced low-pass image;
f) combining said enhanced low-pass image with a high-pass version of said input image thereby creating an enhanced output image.
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Abstract
Embodiments of the present invention comprise methods and systems for brightness preservation using a smoothed gain map.
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Citations
20 Claims
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1. A method for adjusting image code values, said method comprising:
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a) receiving a low-pass version of an input image;
b) determining a low-pass gain process for said low-pass image;
c) creating a low-pass gain image based on said low-pass gain process;
d) spatially smoothing said low-pass gain image;
e) applying said smoothed, low-pass gain image to said low-pass image thereby creating an enhanced low-pass image;
f) combining said enhanced low-pass image with a high-pass version of said input image thereby creating an enhanced output image. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for adjusting image code values, said method comprising:
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a) receiving an input image;
b) performing frequency decomposition on said input image thereby creating a low-pass image and a high-pass image corresponding to said input image;
c) analyzing a color channel in said low-pass image d) determining a low-pass gain process for said low-pass image based on said color channel analysis;
e) creating a low-pass gain image based on said low-pass gain process;
f) spatially smoothing said low-pass gain image;
g) applying said smoothed, low-pass gain image to said low-pass image thereby creating an enhanced low-pass image;
h) combining said enhanced low-pass image with a high-pass version of said input image thereby creating an enhanced output image. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system for adjusting image code values, said method comprising:
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a) a low-pass receiver for receiving a low-pass version of an input image;
b) a gain processor for determining a low-pass gain process for said low-pass image;
c) a gain mapper for creating a low-pass gain image based on said low-pass gain process;
d) a smoother for spatially smoothing said low-pass gain image;
e) an image enhancer for applying said smoothed, low-pass gain image to said low-pass image thereby creating an enhanced low-pass image;
f) a combiner for combining said enhanced low-pass image with a high-pass version of said input image thereby creating an enhanced output image. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification