Shadow detection in a single image
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United States of America Patent
Stats
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Nov 5, 2013
Grant Date -
Mar 21, 2013
app pub date -
Sep 15, 2011
filing date -
Sep 15, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A digital image is divided into patches of pixels, or “superpixels”, where each of the pixels in the patch has approximately the same color value and each of the patches is of approximately the same size. Subsequently, eigenvalues are generated for each patch based on the color values of the individual pixels in the patch, as expressed in a multidimensional color-space. A ratio between the first largest eigenvalue and the second largest eigenvalue for each patch is determined and is then, subsequently, normalized, either based on the intensity of the corresponding patch or normalized to a range between zero and one. The resulting values are compared to a threshold to identify those regions of the digital image that are deemed to be in shadow, thereby generating a shadow mask for the digital image, or are weighted to generate a shadow probability mask.
First Claim
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International Classification(s)
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Cited Art Landscape
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| * 6208417 Method and apparatus for detecting minute irregularities on the surface of an object | 3 | 1999 | |
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| * 8045761 Detection of environmental conditions in a sequence of images | 2 | 2006 | |
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| * 6956898 Method and apparatus for dense motion field based coding | 7 | 1999 | |
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| * 2010/0150,442 METHOD AND APPARATUS FOR SKIN COLOR CORRECTION AND DIGITAL PHOTOGRAPHING APPARATUS USING BOTH | 2 | 2009 | |
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| 7639878 Shadow detection in images | 10 | 2005 | |
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| * 2010/0232,705 Device and method for detecting shadow in image | 4 | 2010 | |
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| * 7366323 Hierarchical static shadow detection method | 13 | 2004 | |
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| * 6349113 Method for detecting moving cast shadows object segmentation | 37 | 1998 | |
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