Systems and methods for selecting a display source light illumination level
First Claim
Patent Images
1. A method for selecting a display source light illumination level, said method comprising:
- a) processing an image, I with a reference display model thereby creating a reference image, Ir;
b) selecting a first source light illumination level, P1, that is less than a maximum source light illumination level, W;
c) estimating the dynamic range of a modified image, I′
created by modifying said image I, to compensate for said first source light illumination level using an actual display model wherein said modified image, I′
has a limited dynamic range bounded by a first minimum dynamic range limit and a first maximum dynamic range limit;
d) calculating a first distortion parameter by comparing the part of said reference image that falls below said first minimum dynamic range limit to said first minimum dynamic range limit and the part of said reference image that falls above said first maximum dynamic range limit to said first maximum dynamic range limit;
e) selecting a second source light illumination level, P2;
f) estimating the dynamic range of a second modified image, I2′
created by modifying said image I, to compensate for said second source light illumination level using said actual display model wherein said modified image, I2′
has a limited dynamic range bounded by a second minimum dynamic range limit and a second maximum dynamic range limit;
g) calculating a second distortion parameter by comparing the part of said reference image that falls below said second minimum dynamic range limit to said second minimum dynamic range limit and the part of said reference image that falls above said second maximum dynamic range limit to said second maximum dynamic range limit; and
h) selecting one of said first source light illumination level, P1 and said second source light illumination level, P2 based on said first and second distortion parameters.
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Abstract
Embodiments of the present invention comprise systems and methods for selecting a display source light illumination level based on distortion parameters.
171 Citations
20 Claims
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1. A method for selecting a display source light illumination level, said method comprising:
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a) processing an image, I with a reference display model thereby creating a reference image, Ir; b) selecting a first source light illumination level, P1, that is less than a maximum source light illumination level, W; c) estimating the dynamic range of a modified image, I′
created by modifying said image I, to compensate for said first source light illumination level using an actual display model wherein said modified image, I′
has a limited dynamic range bounded by a first minimum dynamic range limit and a first maximum dynamic range limit;d) calculating a first distortion parameter by comparing the part of said reference image that falls below said first minimum dynamic range limit to said first minimum dynamic range limit and the part of said reference image that falls above said first maximum dynamic range limit to said first maximum dynamic range limit; e) selecting a second source light illumination level, P2; f) estimating the dynamic range of a second modified image, I2′
created by modifying said image I, to compensate for said second source light illumination level using said actual display model wherein said modified image, I2′
has a limited dynamic range bounded by a second minimum dynamic range limit and a second maximum dynamic range limit;g) calculating a second distortion parameter by comparing the part of said reference image that falls below said second minimum dynamic range limit to said second minimum dynamic range limit and the part of said reference image that falls above said second maximum dynamic range limit to said second maximum dynamic range limit; and h) selecting one of said first source light illumination level, P1 and said second source light illumination level, P2 based on said first and second distortion parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for selecting a display source light illumination level, said method comprising:
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a) processing an image, I with a reference display model that relates image code values to luminance values thereby creating a reference image, Ir; b) selecting a first source light illumination level, P1, that is less than a maximum source light illumination level, W; c) estimating the dynamic range of a modified image, I′
created by modifying said image I, to compensate for said first source light illumination level using an actual display model wherein said modified image, I′
has a limited dynamic range bounded by a first minimum dynamic range limit and a first maximum dynamic range limit;d) calculating a histogram for said reference image, Ir, wherein said histogram comprises at least those reference image code values that are below said first minimum dynamic range limit and those reference image code values that are above said first maximum dynamic range limit; e) calculating a first distortion parameter by comparing code values for which said histogram shows a non-zero bin count and which fall below said first minimum dynamic range limit to said first minimum dynamic range limit and weighting the result of said comparing by a corresponding histogram bin count and by comparing code values for which said histogram shows a non-zero bin count and which fall above said first maximum dynamic range limit to said first maximum dynamic range limit and weighting the result of said comparing by a corresponding histogram bin count; f) selecting a second source light illumination level, P2; g) estimating the dynamic range of a modified image, I′
created by modifying said image I, to compensate for said second source light illumination level using said actual display model wherein said modified image, I′
has a limited dynamic range bounded by a second minimum dynamic range limit and a second maximum dynamic range limit;h) calculating a second distortion parameter by comparing code values for which said histogram shows a non-zero bin count and which fall below said second minimum dynamic range limit to said second minimum dynamic range limit and weighting the result of said comparing by a corresponding histogram bin count, and by comparing code values for which said histogram shows a non-zero bin count and which fall above said second maximum dynamic range limit to said second maximum dynamic range limit and weighting the result of said comparing by a corresponding histogram bin count; and i) selecting one of said first source light illumination level, P1 and said second source light illumination level, P2 based on said first and second distortion parameters. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for selecting a display source light illumination level, said method comprising:
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processing an image, I with a reference display model that relates image code values to luminance values according to; wherein Yref is a luminance value for a reference image, W is a maximum display source light illumination level, cv is a code value for a pixel in said image, I, cvMax is a maximum code value representing the maximum value of a range of possible values in said image, I, and γ
is a display gamma value, wherein said processing of said image, I, results in a reference image, Ir;selecting a first source light illumination level, P1, that is less than a maximum source light illumination level, W; creating of a modified image, I′
by modifying said image, I, to compensate for said first source light illumination level using an actual display model defined by;wherein Yactual is the output of the display model, P is one of a first or second source light illumination level, cv is an image code value, B is a display black level and W is a maximum display source light illumination level wherein said modified image, I′
has a limited dynamic range bounded by a first minimum clipping point and a first maximum clipping point defined, respectively, by;calculating a histogram for said reference image, Ir wherein said histogram comprises at least those reference image code values that are below said first minimum clipping point and those reference image code values that are above said first maximum clipping point; calculating a first distortion parameter by comparing code values for which said histogram shows a non-zero bin count and which fall below said first minimum clipping point to said first minimum clipping point and weighting the result of said comparing by a corresponding histogram bin count and by comparing code values for which said histogram shows a non-zero bin count and which fall above said first maximum clipping point to said first maximum clipping point and weighting the result of said comparing by a corresponding histogram bin count; selecting a second source light illumination level, P2; creating of a modified image, I′
by modifying said image, I, to compensate for said second source light illumination level using an actual display model defined by;wherein Yactual is the output of the display model, P is one of a second or second source light illumination level, cv is an image code value, B is a display black level and W is a maximum display source light illumination level wherein said modified image, I′
has a limited dynamic range bounded by a second minimum clipping point and a second maximum clipping point defined, respectively, by;calculating a histogram for said reference image, Ir wherein said histogram comprises at least those reference image code values that are below said second minimum clipping point and those reference image code values that are above said second maximum clipping point; calculating a second distortion parameter by comparing code values for which said histogram shows a non-zero bin count and which fall below said second minimum clipping point to said second minimum clipping point and weighting the result of said comparing by a corresponding histogram bin count and by comparing code values for which said histogram shows a non-zero bin count and which fall above said second maximum clipping point to said second maximum clipping point and weighting the result of said comparing by a corresponding histogram bin count; and selecting one of said first source light illumination level, P1 and said second source light illumination level, P2 based on said first and second distortion parameters. - View Dependent Claims (17, 18, 19, 20)
wherein D is a distortion parameter, {tilde over (h)} is a histogram bin count, x is an image code value, cvlow is a minimum clipping point, cvhigh is a maximum clipping point and P is a selected display source light illumination level.
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Specification