Algorithm and Device for License Plate Number Recognition Based on Line Drawing

摘要

#$%^&*AU2020102152A420201015.pdf#####ABSTRACT ALGORITHM AND DEVICE FOR LICENSE PLATE NUMBER RECOGNITION BASED ON LINE DRAWING The present invention relates to image data processing, and in particular, to an algorithm and a device for number recognition. This algorithm is used for license plate number recognition. An algorithm and a device for license plate number recognition based on line drawing include the following steps: acquiring a license plate image; performing grayscale and binarization operations on the acquired license plate image; locating a license plate to obtain location data; dividing, based on the location data, each number into valid areas 1, 2, 3, and 4 from top to bottom in the second frame of image; setting contrast values for the four valid areas, counting the number of Is in each row of image data in area 1, area 2, area 3, and area 4, taking a maximum or minimum count value as an eigenvalue, and comparing the eigenvalue with the contrast value for the area to recognize a number. The present invention counts four rows of image data, with faster speed and higher accuracy. Compared with the method of selecting only one row of data, the present invention covers a larger range and is more reliable.1 / 1 Image processing module First D M Third Display FIFO FIFO Video acquisition FPGA module Preproce Algorithm Second. ssing - -- implementation FIFO module module FIG. 1 AArea I Area 2 Area 3 ) Area 4 FIG. 2