Shadow detection and removal in license plate images
First Claim
Patent Images
1. A method for license plate image shadow detection and relighting comprising:
- collecting an image of a license plate with an image capturing device;
identifying a candidate region of interest containing said license plate;
identifying a potentially shaded region of said license plate by identifying a boundary between said potentially shaded region and an unshaded region;
determining if said shaded region is actually shaded; and
relighting said actually shaded region.
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Accused Products
Abstract
A method, system, and apparatus for license plate relighting comprises collecting an image of a license plate, performing license plate recognition on the image of the license plate; calculating a confidence metric for the license plate recognition; and performing a shadow detection and relighting method if the confidence metric is below a predetermined threshold, comprising identifying a shaded region of said license plate, determining if the shaded region is actually shaded, and relighting the actually shaded region.
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Citations
20 Claims
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1. A method for license plate image shadow detection and relighting comprising:
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collecting an image of a license plate with an image capturing device; identifying a candidate region of interest containing said license plate; identifying a potentially shaded region of said license plate by identifying a boundary between said potentially shaded region and an unshaded region; determining if said shaded region is actually shaded; and relighting said actually shaded region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for license plate image shadow detection and relighting comprising:
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a video acquisition module configured to collect image data of a license plate; a processor; and a computer-usable medium embodying computer code, said computer-usable medium being coupled to said processor, said computer code comprising non-transitory instruction media executable by said processor configured for; identifying a candidate region of interest containing said license plate; identifying a potentially shaded region of said license plate by identifying a boundary between said potentially shaded region and an unshaded region in said candidate region of interest containing said license plate; determining if said shaded region is actually shaded; and relighting said actually shaded region. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for license plate image recognition comprising:
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collecting an image of a license plate with an image capturing device; performing license plate recognition on said image of said license plate; calculating a confidence metric for said license plate recognition; and performing a shadow detection and relighting comprising; identifying a candidate region of interest containing said license plate; identifying a potentially shaded region of said license plate by identifying a boundary between said potentially shaded region and an unshaded region; determining if said shaded region is actually shaded; relighting said actually shaded region; and performing a second license plate recognition on said image of said license plate if said confidence metric is below a predetermined threshold. - View Dependent Claims (18, 19, 20)
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Specification