采用radon变换的倾斜车牌校正

clear,clc,close all; tic I=imread('C:\Users\xueyisong\Desktop\车牌识别\32.JPG'); imshow(I);title('Original image'); gray=rgb2gray(I);figure,imshow(gray);title('Grayscale image'); bw=edge(gray,'sobel'); theta=1:180;%水平校正 [R,xp]=radon(bw,theta); [I0,J]=find(R>=max(max(R)));%J记录了倾斜角 qingxiejiao=90-J; I1=imrotate(I,qingxiejiao,'bilinear','loose'); figure,imshow(I1);title('correct image'); gray=rgb2gray(I1); bw2=edge(gray,'sobel'); theta=-45:45;%垂直校正 [R,xp]=radon(bw2,theta); [I0,J1]=find(R>=max(max(R))); qingxiejiao=45-J1; H=[1,0,0;tand(qingxiejiao),1,0;0,0,1]; T=maketform('affine',H); I2=imtransform(I1,T); toc figure,imshow(I2);title('correct image');