Method of performing fast bilateral filtering and using the same for the display of high-dynamic-range images
First Claim
1. A method of performing piece-wise linear bilateral filtering comprising:
- computing a weight of each of a plurality of pixels of an image using a Gaussian in a spatial domain; and
multiplying said weight by an influence function in the intensity domain wherein a weight of a pixel with a large intensity difference from weights of other pixels of said plurality of pixels is reduced.
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Abstract
A method of performing bilateral filtering and using the method for displaying high-dynamic-range images is presented. The method reduces the contrast of the image while preserving detail of the image. The presently disclosed method incorporates a two-scale decomposition of the image into a base layer encoding large-scale variations, and a detail layer. The base layer has its contrast reduced, thereby preserving detail. The base layer is obtained using an edge-preserving bilateral filter. The bilateral filter is a non-linear filter, where the weight of each pixel is computed using a Gaussian in the spatial domain multiplied by an influence function in the intensity domain that decreases the weight of pixels with large intensity differences. The bilateral filtering is accelerated by using a piecewise-linear approximation in the intensity domain and appropriate subsampling.
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Citations
29 Claims
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1. A method of performing piece-wise linear bilateral filtering comprising:
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computing a weight of each of a plurality of pixels of an image using a Gaussian in a spatial domain; and multiplying said weight by an influence function in the intensity domain wherein a weight of a pixel with a large intensity difference from weights of other pixels of said plurality of pixels is reduced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for reducing contrast while preserving detail comprising:
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selecting a high dynamic range digital image; decomposing said image into an intensity layer and a color layer; running said intensity layer through a bilateral filter to obtain a base layer; dividing said intensity layer by said base layer to obtain a detail layer; reducing contrast in said base layer; and recombining said base layer having reduced contrast with said detail layer and said color layer to obtain a reduced contrast image. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification