Image preprocessing method for license plate recognition and license plate recognition system using thereof

摘要

The present invention relates to an image preprocessing method for extracting a license plate candidate region and a design method of a hardware block for implementing the same. According to the present invention, in the preprocessing process for extracting a license plate region more accurately, a conventional Sobel mask The contour extraction algorithm using the (Sobel Mask) pattern is very slow because the multiplication operation is involved in the calculation process, and the conventional noise removal algorithm using erosion and expansion is added and subtracted to solve the problem of low recognition rate. Image for recognition of license plate, which is configured to extract license plate candidate area with high recognition rate by using window scan algorithm and noise reduction algorithm considering characteristics of license plate area and noise area or various situationsThe method of designing a method and a hardware block diagram for implementing same are provided.