matlab 二维码识别 示例源码

clc
clear

javaaddpath('.\zxing-1.6\core\core.jar');
javaaddpath('.\zxing-1.6\javase\javase.jar');

I=imread('1.jpg');
K=rgb2gray(I);%一.图像灰度化目的是让后续计算量少
L=medfilt2(K,[4,4]);%二.中值滤波去噪使图像更加清晰
%[T,SM]=imhist(L);
[m,n]=size(L); %把图像转换为数组，m是行数，n是列数，每一个像素点对应一个数组元素
max = L(1,1);
min = L(1,1);
for i=1:m  
for j=2:n       
if L(i,j)<min         
min = L(i,j);%求得数组中像素值最小的像素点
if L(i,j)>max
max= L(i,j);%求得数组中像素值最大的像素点  
end
end
end
end
avg = (max min)/2;%对最大与最小求平均值最为二值化化的阀值
for i=1:m%三.对图像进行二值化的目的是让二维码识别更加方便 
for j=1:n       
if L(i,j)<avg         
L(i,j)=0;%对于像素值小于平均值的点都置为0      
else L(i,j)>=avg & L(i,j)<256          
L(i,j)=255;%对于像素值大于平均值的点都置为255      
end    
end
end
theta=pi;%四.对于给定的二维码进行旋转处理使倒置的二维码变正
T2=[cos(theta) sin(theta) 0
   -sin(theta) cos(theta) 0
   0           0          1];                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
t2=maketform('affine',T2);
P=imtransform(L,t2);
imshow(P);
message = decode_qr(P);