Vehicle type recognition method and apparatus

Abstract

The invention provides a vehicle type recognition method and apparatus. The method comprises: extracting a first sub-image corresponding to a to-be-queried vehicle in a to-be-queried image; obtaining the visual feature similarity between the first sub-image and each vehicle type in a pre-established database; and when determining that the visual feature similarity is greater than a preset first threshold, taking a vehicle type corresponding to a maximum value in the visual feature similarity greater than the preset first threshold as an output recognition result, wherein the database comprises a plurality of vehicle type databases, each vehicle type database comprises a set of multiple sample images of the vehicle type, and the sample images of the vehicle type include vehicle images in different lighting conditions, vehicle images of different shooting angles and vehicle images of different scenes. The method can solve the problem of incapability of realizing vehicle recognition due to license plate recognition precision limitation, fake license plate, no license plate or license plate damage, and improve the accuracy of vehicle recognition.

Description

Technical field [0001] The invention relates to the technical field of intelligent transportation, in particular to a method and device for vehicle identification. Background technique [0002] With the rapid development of my country's economy, the continuous expansion of the scale of cities, and the substantial increase in the number of vehicles, my country's transportation system is gradually becoming intelligent. To find the target vehicle in the massive surveillance video data, the traditional technical method is to search through the vehicle license plate number recognition result, which depends on the license plate recognition function. However, the license plate recognition function cannot be used in situations where the license plate is contaminated, the license plate is obscured, and the license plate is unlicensed. What's more, because the license plate is easy to change, the suspected vehicles that need key monitoring in the public security business often adopt the me...

AI Technical Summary

Problems solved by technology

However, the license plate recognition function cannot be used when the license plate is defaced, the license plate is covered, or there is no license plate. What's more, because the license plate is easy to change, the suspect vehicles that need to be monitored in the public security business often adopt the way of changing the license plate to avoid monitoring. The practicality of video surveillance systems such as bayonet based on license plate recognition has been reduced. Therefore, the public security business has put forward application requirements for vehicle type recognition

[0003] In the prior art, vehicle outline features are generally used to roughly determine whether the vehicle belongs to a large, medium, or small car. For example, it only recognizes whether the target vehicle is a truck, a van, or a car, and cannot be specific to a model

However, the method of directly using license plate recognition to read vehicle model information from the database is greatly limited by the accuracy of license plate recognition, and it will also fail when encountering vehicles with false plates, no license plates, and damaged license plates, so the accuracy of the vehicle or recognition results cannot be recognized. not tall

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