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    clear
rgb=imread('plateRN.jpg','jpg');
%pic=imresize(rgb,[240 320]);
%imshow(rgb);
gry=rgb2gray(rgb);
gry=gry>200;
gry=~gry;
imshow(gry);

ret=statistic_pix(gry);
figure;
stairs(ret, 'DisplayName', 'ret', 'YDataSource', 'ret'); figure(gcf);
%显示统计结果

%BW=im2bw(gry);

%BW=BW<100;
%figure;
%imshow(BW);