METHOD AND APPARATUS FOR TRANSFORMING A HIGH DYNAMIC RANGE IMAGE INTO A LOW DYNAMIC RANGE IMAGE
First Claim
1. A method for converting a high dynamic range image into a low dynamic range image, the high dynamic range image having a plurality of pixels, the pixels respectively corresponding to a plurality of first luminance values, the method comprising following steps:
- (a) converting the first luminance values associated with the pixels into a plurality of second luminance values, a second luminance range of the second luminance values being smaller than a first luminance range of the first luminance values; and
(b) utilizing a film transfer function for mapping the second luminance values associated with the pixels into a plurality of third luminance values to generate the low dynamic range image, wherein the film transfer function adds no visual artifact to the low dynamic range image.
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Abstract
A method and an apparatus for transforming a high dynamic range image into a low dynamic range image. The method includes converting first luminance values associated with pixels into a plurality of second luminance values, and utilizing a film transfer function for mapping the second luminance values associated with the pixels into a plurality of third luminance values to generate the low dynamic range image. A second luminance range of the second luminance values is smaller than a first luminance range of the first luminance values, and the film transfer function adds no visual artifact to the low dynamic range image.
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Citations
10 Claims
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1. A method for converting a high dynamic range image into a low dynamic range image, the high dynamic range image having a plurality of pixels, the pixels respectively corresponding to a plurality of first luminance values, the method comprising following steps:
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(a) converting the first luminance values associated with the pixels into a plurality of second luminance values, a second luminance range of the second luminance values being smaller than a first luminance range of the first luminance values; and
(b) utilizing a film transfer function for mapping the second luminance values associated with the pixels into a plurality of third luminance values to generate the low dynamic range image, wherein the film transfer function adds no visual artifact to the low dynamic range image. - View Dependent Claims (2, 3, 4)
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5. An image processing system comprising:
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an image generator for generating a high dynamic range image, the high dynamic range image having a plurality of pixels, the pixels respectively corresponding to a plurality of first luminance values; and
an image processing logic for converting the first luminance values associated with the pixels into a plurality of second luminance values and utilizing a film transfer function for mapping the second luminance values associated with the pixels into a plurality of third luminance values without adding visual artifacts to generate a low dynamic range image;
wherein a second luminance range of the second luminance values is smaller than a first luminance range of the first luminance values. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification