matlab图片读出极坐标数据,Matlab 图像转极坐标系

实心圆环

imgVP1=flip(imgVP1,1);  % 水平翻转

polarVP1=polarVolinPlot(imgVP1); % 调用函数

空心圆环

[m,n,~]=size(imgVP2);

% 填充空心部分

for i=m:m+300

for j=1:n

imgVP2(i,j,:)=[255,255,255];

end

end

imgVP2=flip(imgVP2,1);

polarVP2=polarVolinPlot(imgVP2);

function [polarImg] = polarImg(img0)% polarImg Rimg0=double(img0(:,:,1)); Gimg0=double(img0(:,:,2)); Bimg0=double(img0(:,:,3)); [m,n]=size(Rimg0); %原图坐标 [t,r]=meshgrid(linspace(-pi,pi,n),1:m); M=2*m;N=2*n; [NA,MA]=meshgrid((1:N)-n-0.5,(1:M)-m-0.5); T=atan2(NA,MA); R=sqrt(MA.^2+NA.^2);%变换坐标 Rpolar=interp2(t,r,Rimg0,T,R,‘linear‘,0); Gpolar=interp2(t,r,Gimg0,T,R,‘linear‘,0); Bpolar=interp2(t,r,Bimg0,T,R,‘linear‘,0); polarImg=uint8(cat(3,Rpolar,Gpolar,Bpolar)); polarImg=imrotate(polarImg, -90); % 图片裁剪 if M