License plate recognition method and device
A license plate recognition and license plate technology, which is applied in the field of intelligent transportation, can solve the problems of reducing the recognition rate of the license plate recognition system and the wrong recognition results, and achieve the effect of improving the recognition accuracy.
Active Publication Date: 2013-11-13
SHENZHEN JIESHUN SCI & TECH IND
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[0007] The purpose of the embodiments of the present invention is to provide a license plate recognition method, aiming at the current license plate recognition system only considers the frequency of the recognition results when voting on the recognition results, which reduces the recognition rate of the entire license plate recognition system, resulting in errors The problem with the recognition result
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[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0028] The embodiment of the present invention considers the resolution and deformation degree of the license plate in different video frames, votes on the joint confidence of each character classification of each character image, and uses the character classification with the highest number of votes as the final recognition result of the character image , eliminating the influence of the reliability of the license plate character image itself on the recognition results, and improving the recognition accuracy of the entire license plate recognition system.
[0029] figure 1 It is an implementation...
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The invention belongs to the field of intelligent transportation and particularly relates to a license plate recognition method and device. The license plate recognition method comprises respectively extracting pictures of n characters on a license plate in current video frames; obtaining the confidence of the license plate of the video frame; respectively obtaining character classifications obtained by matching every character picture on a valid license plate and a preset character template and the character confidences of the character classifications; respectively obtaining the combined confidence of every character classification; storing every character classification of every character picture in d video frames containing the valid license plate and the combined confidence of the character classification; determining whether a preset vote condition is met, if so, voting for the combined confidence of every character classification of the pictures at the same position. According to the license plate recognition method and device, the recognition accuracy of the whole license plate recognition system is improved.
Description
technical field [0001] The invention belongs to the field of intelligent transportation, and in particular relates to a license plate recognition method and device. Background technique [0002] The characters on the license plate contain Chinese characters, English letters or numbers. Due to the similarity of the characters themselves, such as the characters O, D, Q, 0, and due to the influence of the resolution and deformation of the license plate, and the existence of character segmentation errors , the characters in the same position of the same license plate may have different recognition results in different video frames. In the prior art, the accuracy of the recognition result is improved by counting the recognition results and using the result with the highest frequency as the final recognition result. [0003] However, since the existing technology only votes based on the frequency of recognition results, the following two issues are not considered: [0004] 1. Th...
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Inventor 唐健吴伟华陶昆廖振生
Owner SHENZHEN JIESHUN SCI & TECH IND