Blue sky color detection technique
First Claim
Patent Images
1. An image enhancement technique comprising the steps of:
- (a) receiving an input image and providing a low-pass filtered image that maintains a substantial number of edges therein;
(b) processing said low-pass filtered image to provide respective scores for pixels of said low pass filtered image based on a likelihood map of said image denoting respective likelihoods that pixels of said image are a sky color, said likelihood map constructed by;
(i) dividing a color space of said image into a plurality of areas;
(ii) defining HSV values independently for each of said plurality of areas; and
(iii) using the HSV values of each area to determine said likelihoods;
(c) filtering said low-pass filtered image based upon a user selection to selectively enhance said sky color;
(d) blending said low-pass filtered image and said filtered low-pass filtered image with one another based upon said scores;
(e) combining said blended image with a high pass filtered said input image to provide an enhanced imaged.
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Abstract
An image enhancement technique includes a filter that receives an input image and provides a low-pass filtered image that maintains a substantial number of edges therein. The low pass filtered image is provided a likelihood of being a sky color for each pixel of the low pass filtered image. The low-pass filtered image is filtered based upon a user selection to selectively enhance the sky color. The low-pass filtered image and the filtered low-pass filtered image are blended based upon the user selection based upon the likelihood. The blended image is combined with a high pass filtered input image to provide an enhanced image.
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Citations
16 Claims
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1. An image enhancement technique comprising the steps of:
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(a) receiving an input image and providing a low-pass filtered image that maintains a substantial number of edges therein; (b) processing said low-pass filtered image to provide respective scores for pixels of said low pass filtered image based on a likelihood map of said image denoting respective likelihoods that pixels of said image are a sky color, said likelihood map constructed by;
(i) dividing a color space of said image into a plurality of areas;
(ii) defining HSV values independently for each of said plurality of areas; and
(iii) using the HSV values of each area to determine said likelihoods;(c) filtering said low-pass filtered image based upon a user selection to selectively enhance said sky color; (d) blending said low-pass filtered image and said filtered low-pass filtered image with one another based upon said scores; (e) combining said blended image with a high pass filtered said input image to provide an enhanced imaged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification