License plate recognition method, device and system

Abstract

The embodiment of the invention provides a license plate recognition method, device and system. The license plate recognition method comprises a step of detecting a collected license plate image by using a preset image segmentation algorithm and determining the position of each character in the license plate image, a step of determining a tilt angle range of the license plate image according to the position of each character in the license plate image, a step of performing rotation correction on the license plate image according to the tilt angle range to obtain a corrected license plate image, a step of acquiring vertex coordinates of the corrected license plate image and transforming the vertex coordinates through perspective transformation to obtain a converted license plate image withthe same height of the character, and a step of identifying each character in the converted license plate image to obtain a recognized license plate. Through the scheme, the calculation efficiency andsuccess rate of license plate recognition can be improved.

Description

technical field [0001] The invention relates to the technical field of intelligent transportation, in particular to a license plate recognition method, device and system. Background technique [0002] License plate recognition technology is an application of computer video image recognition technology in vehicle license plate recognition. License plate recognition technology requires the ability to extract and recognize vehicle license plates from complex backgrounds, and identify vehicle plate numbers through license plate extraction, image preprocessing, feature extraction, and license plate character recognition. Therefore, license plate recognition technology has been widely used in checkpoints, parking lots, and electronic police to obtain license plate information of vehicles in the scene and play an important role in many aspects such as public security management. [0003] When the camera captures the image, the captured license plate image may tend to be tilted due...

AI Technical Summary

Problems solved by technology

[0004] However, for something like figure 1 The license plate example of the parking violation scene is shown. The parking violation is a special dome camera device used in the traffic management system to photograph illegal parking. In the above method, the value of n needs to be set very large, which will increase the time-consuming system operation and reduce the operation efficiency

Moreover, because the shooting angle is too large, the collected license plate image will be deformed, resulting in a high probability of failure in license plate recognition

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