Methods and systems for inverse tone mapping
First Claim
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1. A method to perform inverse tone mapping, the method comprising:
- providing, by a computer, a luminance of an image;
detecting, by a computer, highlights in the luminance, thereby obtaining a highlight detection parameter;
estimating, by a computer, a mid-value of the luminance, thereby obtaining a mid-value luminance parameter;
providing, by a computer, minimum and maximum luminance values for a lower dynamic range display and for a higher dynamic range display;
calculating, by a computer, an inverse tone mapping curve, based on the highlight detection parameter, the mid-value luminance parameter, and the minimum and maximum luminance values for the lower dynamic range display and the higher dynamic range display; and
applying, by a computer, the inverse tone mapping curve to the luminance as a global mapping operator, thereby obtaining an inversely mapped luminance.
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Abstract
Novel methods and systems for inverse tone mapping are disclosed. A scene can be analyzed to obtain highlight detection from bright light sources and specular reflections. An inverse tone mapping curve can be calculated based on the lower dynamic range and higher dynamic range displays. Multi-scale filtering can be applied to reduce noise or artifacts.
40 Citations
18 Claims
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1. A method to perform inverse tone mapping, the method comprising:
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providing, by a computer, a luminance of an image; detecting, by a computer, highlights in the luminance, thereby obtaining a highlight detection parameter; estimating, by a computer, a mid-value of the luminance, thereby obtaining a mid-value luminance parameter; providing, by a computer, minimum and maximum luminance values for a lower dynamic range display and for a higher dynamic range display; calculating, by a computer, an inverse tone mapping curve, based on the highlight detection parameter, the mid-value luminance parameter, and the minimum and maximum luminance values for the lower dynamic range display and the higher dynamic range display; and applying, by a computer, the inverse tone mapping curve to the luminance as a global mapping operator, thereby obtaining an inversely mapped luminance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification