High dynamic range images from low dynamic range images
First Claim
Patent Images
1. A method for displaying a color image comprising:
- (a) receiving an image having a first dynamic range;
(b) modifying said image with a computing device to a second dynamic range, wherein said second dynamic range is greater than said first dynamic range;
wherein said modification includes the steps of;
(i) converting a received said image which is in a substantially gamma domain to a substantially linear luminance domain;
(ii) processing at least two color channels of said image, in said substantially linear luminance domain to assign a first luminance value as a maximum diffuse luminance of said image;
(iii) said modifying is based upon a scaling operation that scales luminance values using a pair of linear functions each linear in a luminance domain of said image and joined together at a second luminance value of said substantially linear luminance domain in the respectively processed said at least two color channels, where said second luminance value is less than said first luminance value by an amount calculated as a function of said first luminance value; and
(c) displaying said modified image on a display.
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Abstract
A method for displaying an image includes receiving an image having a first luminance dynamic range and modifying the image to a second luminance dynamic range free from being based upon other images, where the second dynamic range is greater than the first dynamic range. The modified image is displayed on a display.
335 Citations
10 Claims
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1. A method for displaying a color image comprising:
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(a) receiving an image having a first dynamic range; (b) modifying said image with a computing device to a second dynamic range, wherein said second dynamic range is greater than said first dynamic range; wherein said modification includes the steps of; (i) converting a received said image which is in a substantially gamma domain to a substantially linear luminance domain; (ii) processing at least two color channels of said image, in said substantially linear luminance domain to assign a first luminance value as a maximum diffuse luminance of said image; (iii) said modifying is based upon a scaling operation that scales luminance values using a pair of linear functions each linear in a luminance domain of said image and joined together at a second luminance value of said substantially linear luminance domain in the respectively processed said at least two color channels, where said second luminance value is less than said first luminance value by an amount calculated as a function of said first luminance value; and (c) displaying said modified image on a display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for displaying an image having specular highlights, said method comprising:
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(a) receiving an image having a first dynamic range; (b) modifying said image with a processing device to a second dynamic range using a transformation that allocates a specular portion of said second dynamic range to display said specular highlights and a diffuse portion of said second dynamic range to display diffuse tones of said image, wherein said second dynamic range is greater than said first dynamic range, and wherein said specular portion of said second dynamic range has a size calculated as a function of a maximum diffuse luminance value received from said image; (c) displaying said modified image a display. - View Dependent Claims (10)
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Specification