Method for increasing effective distance of face recognition and license plate recognition of police helmet

Abstract

A method for increasing the effective distance of the face recognition and license plate recognition of a police helmet comprises the following steps that S1, at least two prime lenses are installed on the police helmet, the prime lenses at least comprise a short-focus lens and a long-focus lens, and the two adjacent lenses are distributed at intervals; s2, the short-focus lens and the long-focus lens shoot images of the target object at the same time, the images shot by the short-focus lens are short-focus images, and the images shot by the long-focus lens are long-focus images; a face and a license plate are recognized through the short-focus image and the long-focus image; the short-focus image and the long-focus image are analyzed by using software so as to judge the target distance and / or judge the definition of the short-focus image and the long-focus image respectively; s3, a short-focus lens and a long-focus lens are automatically switched according to the judged target distance; or the target distance is judged according to the definition of images shot by different lenses, and the working lenses are automatically switched; and S4, a clear target image is shot by using a lens suitable for the target distance, and the image is displayed to a user.

Description

technical field [0001] The invention relates to image collection and recognition technology, in particular to a method for increasing the effective distance of police helmet face recognition and license plate recognition. Background technique [0002] In the existing technology, in order to increase the effective distance range of face recognition and license plate recognition of the police helmet camera, the helmet camera adopts a zoom lens, but this method is very limited in the distance of face recognition and license plate recognition, which affects practical applications. On the one hand, the effective identification range of the zoom lens is limited; on the other hand, the zoom lens is expensive, bulky and heavy, and driving the zoom lens requires relatively large power consumption. [0003] In this regard, the applicant proposed a method to increase the effective distance of face recognition and license plate recognition of police helmets, which uses two fixed-focus l...

AI Technical Summary

Problems solved by technology

[0002] In the existing technology, in order to increase the effective distance range of face recognition and license plate recognition of the police helmet camera, the helmet camera uses a zoom lens, but this method is very limited in the face recognition and license plate recognition distance, which affects practical applications

On the one hand, the effective recognition range of the zoom lens is limited; on the other hand, the cost of the zoom lens is high, the size and weight are large, and the driving of the zoom lens requires a large power consumption

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