Method for reducing enhancement of artifacts and noise in image color enhancement
First Claim
Patent Images
1. A method for enhancing the color of an image to be displayed on a display comprising:
- (a) receiving an image having a plurality of pixels where each of said pixels has a plurality of color components and decomposing said image into a low-frequency base image and a high-frequency residual image using a nonlinear sigma filter that assigns sharp edges in said image to said base image, where said sigma filter is separately applied to each of said plurality of color components;
(b) modifying said base image with a pixel-based filter, after said image has been decomposed into said base image and said residual image, where said pixel-based filter increases the dynamic range of colors in said base image such that the difference between different colors is increased, and not modifying said residual image using pixel-based filter, where said pixel-based filter is jointly applied to at least two of said plurality of color components;
(c) modifying said residual image with a coring filter, and not modifying said base image with said coring filter;
(d) recombining the modified said base image with the modified said residual image to obtain a modified image; and
(e) displaying said modified image on said display.
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Abstract
A method for enhancing the color of an image to be displayed on a display includes receiving an image having a plurality of pixels where each of the pixels has a plurality of color components. The image is filtered using a spatial filter in such a manner that the lower frequency content of the image is enhanced in such a manner that the dynamic range of the lower frequency content is increased. The filtered image is modified such that the higher frequency content of the image to obtain a modified image that includes the higher frequency content and the lower frequency content.
294 Citations
8 Claims
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1. A method for enhancing the color of an image to be displayed on a display comprising:
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(a) receiving an image having a plurality of pixels where each of said pixels has a plurality of color components and decomposing said image into a low-frequency base image and a high-frequency residual image using a nonlinear sigma filter that assigns sharp edges in said image to said base image, where said sigma filter is separately applied to each of said plurality of color components; (b) modifying said base image with a pixel-based filter, after said image has been decomposed into said base image and said residual image, where said pixel-based filter increases the dynamic range of colors in said base image such that the difference between different colors is increased, and not modifying said residual image using pixel-based filter, where said pixel-based filter is jointly applied to at least two of said plurality of color components; (c) modifying said residual image with a coring filter, and not modifying said base image with said coring filter; (d) recombining the modified said base image with the modified said residual image to obtain a modified image; and (e) displaying said modified image on said display. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for enhancing the color of an image to be displayed on a display comprising:
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(a) receiving an image having a plurality of pixels where each of said pixels has a plurality of color components; (b) filtering each of said color components of said plurality of components with a sigma filter to obtain a base image wherein said base image is characterized by having edge content and otherwise primarily low frequency components of said image, where said sigma filter is separately applied to each of said plurality of color components; (c) modifying said input image using said base image to obtain a residual image wherein said residual image is characterized by having primarily high frequency components of said image; (d) filtering said base image with a pixel-based color enhancement technique, after said image has been separated into said base image and said residual image, to obtain an enhanced base image in such a manner that the dynamic range of colors in said base image is increased such that the difference between different colors is enhanced, where said color enhancement technique is jointly applied to at least two of said plurality of color components; (e) modifying said enhanced base image based upon said residual image to obtain an enhanced image that includes said high frequency content of said image; and (f) displaying said modified image on said display. - View Dependent Claims (8)
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Specification