matlab大神解释下下面代码的意思:f1=double(img);f2=zeros(m,n,3);for x=1:m;for y=1:n;if f1(x,y)>DL1f2(x,y,1)=f2(x,y)+1; %设置显示颜色f2(x,y,2)=0;f2(x,y,3)=0;v(x,y,1)=V1x; %设置向量场方向v(x,y,2)=V1y;
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