Methods and systems for enhancing display characteristics with high frequency contrast enhancement
First Claim
Patent Images
1. A method for adjusting an image for increased brightness, said method comprising:
- filtering said image to create a high-pass image and a low-pass image;
selecting a maximum fidelity point (MFP);
generating a tone scale adjustment model wherein said tone scale adjustment model effects a linear gain below said MFP and applies a round-off curve above said MFP;
applying said tone scale adjustment model to said low-pass image to produce a tone scale adjusted low-pass image;
generating a gain map function that is related to said tone scale adjustment model such that said gain map function effects no gain below said MFP and effects an increasing gain as image code values increase above said MFP;
applying said gain map function to said high-pass image to produce a gain-enhanced, high-pass image; and
combining said tone scale adjusted low-pass image with said gain-enhanced high-pass image to create an enhanced image.
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Abstract
Embodiments of the present invention comprise systems, methods and devices for increasing the perceived brightness of an image. In some embodiments this increase compensates for a decrease in display light-source illumination.
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Citations
13 Claims
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1. A method for adjusting an image for increased brightness, said method comprising:
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filtering said image to create a high-pass image and a low-pass image; selecting a maximum fidelity point (MFP); generating a tone scale adjustment model wherein said tone scale adjustment model effects a linear gain below said MFP and applies a round-off curve above said MFP; applying said tone scale adjustment model to said low-pass image to produce a tone scale adjusted low-pass image; generating a gain map function that is related to said tone scale adjustment model such that said gain map function effects no gain below said MFP and effects an increasing gain as image code values increase above said MFP; applying said gain map function to said high-pass image to produce a gain-enhanced, high-pass image; and combining said tone scale adjusted low-pass image with said gain-enhanced high-pass image to create an enhanced image. - View Dependent Claims (2, 3, 4)
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5. A method for adjusting an image for increased brightness, said method comprising:
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selecting a maximum fidelity point (MFP); generating a tone scale adjustment model wherein said tone scale adjustment model effects a linear gain below said MFP and applies a round-off curve above said MFP; applying said tone scale adjustment model to said image to produce a tone scale adjusted image; computing an adjusted high-pass image and an adjusted low-pass image from said tone scale adjusted image; generating a gain map function that is related to said tone scale adjustment model such that said gain map function effects no gain below said MFP and effects an increasing gain as image code values increase above said MFP; applying said gain map function to said adjusted high-pass image to produce a gain-enhanced, adjusted high-pass image; and adding said adjusted low-pass image to said gain-enhanced, adjusted high-pass image to form an enhanced image. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method for adjusting an image for increased brightness, said method comprising:
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selecting a maximum fidelity point (MFP); applying a tone scale adjustment model to an input image to produce a tone scale adjusted image; computing an adjusted high-pass image and an adjusted low-pass image from said tone scale adjusted image; generating a gain map function that is related to said tone scale adjustment model wherein said gain map function effects no gain below said MFP and effects an increasing gain as image code values increase above said MFP; applying said gain map function to said adjusted high-pass image to produce a gain-enhanced, adjusted high-pass image, wherein said gain map function is dependent on at least one of a display gamma, an efficiency factor and a maximum fidelity point (MFP) of said tone scale adjustment model; and adding said adjusted low-pass image to said gain-enhanced, adjusted high-pass image to form an enhanced image. - View Dependent Claims (12, 13)
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Specification