Exploiting color for license plate recognition
First Claim
Patent Images
1. A method for exploiting color for object recognition, said method comprising:
- identifying at least one region of an image having character-like features;
obtaining an average color of said at least one region after using an outlier rejection in a perceptually uniform color space to eliminate non-character colors associated with said at least one region; and
modifying all portions of said image with colors that are a fixed amount above said average color, after said obtaining said average color of said least one region after using said outlier rejection to eliminate said noncharacter colors.
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Abstract
Methods and systems for exploiting color for object recognition. A color gradient for each pixel in a gradient image of an object can be calculated. The gradient image can be binarized to produce an image having white walls around characters and other structures. A connected component analysis operation can be performed with respect to black regions in the image to determine bounding boxes for characters and other pictorial elements in the image and thereafter identify character candidates from the image utilizing character metrics. Non-character colors can then be eliminated from the image utilizing an outlier rejection.
28 Citations
20 Claims
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1. A method for exploiting color for object recognition, said method comprising:
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identifying at least one region of an image having character-like features; obtaining an average color of said at least one region after using an outlier rejection in a perceptually uniform color space to eliminate non-character colors associated with said at least one region; and modifying all portions of said image with colors that are a fixed amount above said average color, after said obtaining said average color of said least one region after using said outlier rejection to eliminate said noncharacter colors. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for exploiting color for object recognition, said system comprising:
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at least one processor; and a non-transitory computer-usable medium embodying computer program code, said computer-usable medium capable of communicating with said at least one processor, said computer program code comprising instructions executable by said at least one processor and configured for; identifying at least one region of an image having character-like features; obtaining an average color of said at least one region after using an outlier rejection in a perceptually uniform color space to eliminate non-character colors associated with said at least one region; and modifying all portions of said image with colors that are a fixed amount above said average color, after said obtaining said average color of said least one region after using said outlier rejection to eliminate said noncharacter colors. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transitory processor-readable medium storing code representing instructions to cause a process for exploiting color for object recognition, said code comprising code to:
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identify at least one region of an image having character-like features; obtain an average color of said at least one region after using an outlier rejection in a perceptually uniform color space to eliminate non-character colors associated with said at least one region; and modify all portions of said image with colors that are a fixed amount above said average color, after said obtaining said average color of said least one region after using said outlier rejection to eliminate said noncharacter colors. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification