Vehicle surface image and text extraction method based on laser ranging and vehicle surface image and text extraction device based on laser ranging

Abstract

The embodiment of the invention provides a vehicle surface image and text extraction method based on laser ranging and a vehicle surface image and text extraction device based on laser ranging. The method comprises the steps that the lattice distance matrix of the vehicle surface is determined according to the distance information from the laser pulse starting position to each laser scanning pointon the vehicle surface; the lattice intensity image of the vehicle surface is determined according to the intensity information of the echo pulse of each laser scanning point on the vehicle surface;gradient division is performed on the lattice distance matrix on the basis of rows or columns according to the preset gradient interval, and multiple distance gradients of the lattice distance matrixare determined; and multi-threshold binarization is performed on the lattice intensity image and the corresponding row or column of the lattice distance matrix under the same distance gradient according to multiple distance gradients so as to determine the vehicle surface image and text. Compared with conventional OCR, the method and the device have the advantages of long detection distance and large breadth so that the limitation of conventional near image and text recognition can be broken through, overall three-dimensional modeling of the target vehicle can be realized and extraction of long-distance and large-size patterns and characters can be realized.

Description

technical field [0001] The embodiments of the present invention relate to the field of intelligent transportation, and in particular to a method for extracting images and texts on a vehicle surface. Background technique [0002] Optical Character Recognition (Optical Character Recognition; OCR for short) is the current mainstream technology for image and text recognition. It mainly acquires images on the medium through scanning equipment or imaging equipment, and then extracts images and texts through image processing technology to identify semantic patterns. Mainly used in license plate recognition, scanned text recognition, electronic paper books, etc. [0003] Conventional OCR recognition, the recognition object is roughly A4 paper size graphic carrier. Recognition objects have limitations in terms of pixels and image frames. In addition, the distance between the recognition device and the recognition object is required to be short, which cannot meet the requirements fo...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of short recognition distance and low background resolution existing in the existing vehicle surface image and text recognition methods, the present invention provides a vehicle surface image and text extraction method and device

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