ROBUST CROPPING OF LICENSE PLATE IMAGES
First Claim
1. A method for robust cropping of a license plate image, said method comprising:
- identifying a first detail of said license plate image utilizing an image-based classifier;
identifying a second detail of said license plate image utilizing a gradient-based classifier; and
utilizing said identified first detail and said identified second detail to accurately recognize and identify a license plate in said license plate image.
4 Assignments
0 Petitions
Accused Products
Abstract
A method, system, and computer-usable tangible storage device for robustly cropping and accurately recognizing license plates to account for noise sources and interfering artifacts are disclosed. License plate images and sub-images can be tightly cropped utilizing an image-based classifier and gradient-based cropping. An image-based classifier can identify the location of valid characters within the image. Because of a number of noise sources, such as, for example, residual plate rotation and shear in the characters within the image, the image-based classifier performs a “rough” identification of the image boundaries. An additional processing step utilizing gradient-based cropping is performed to fine-tune the license plate image boundaries. Gradient-based cropping eliminates unwanted border artifacts that could substantially impact the segmentation and license plate character recognition results.
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Citations
20 Claims
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1. A method for robust cropping of a license plate image, said method comprising:
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identifying a first detail of said license plate image utilizing an image-based classifier; identifying a second detail of said license plate image utilizing a gradient-based classifier; and utilizing said identified first detail and said identified second detail to accurately recognize and identify a license plate in said license plate image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for robust cropping of a license plate image, comprising:
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a processor; a data bus coupled to said processor; and a computer-usable tangible storage device storing computer program code, said computer program code comprising program instructions executable by said processor for robust cropping of a license plate image, said program instructions comprising; program instructions to identify a first detail of said license plate image utilizing an image-based classifier; program instructions to identify a second detail of said license plate image utilizing a gradient-based classifier; and program instructions to utilize said identified first detail and said identified second detail to accurately recognize and identify a license plate in said license plate image. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A computer-usable tangible storage device storing computer program code, said computer program code comprising program instructions executable by a processor for robust cropping of a license plate image, said program instructions comprising:
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program instructions to identify a first detail of said license plate image utilizing an image-based classifier; program instructions to identify a second detail of said license plate image utilizing a gradient-based classifier; and program instructions to utilize said identified first detail and said identified second detail to accurately recognize and identify a license plate in said license plate image. - View Dependent Claims (18, 19, 20)
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Specification