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<N

polarImg = imcrop(polarImg,[0,(N-M)/2,M,M]);

else

polarImg = imcrop(polarImg,[0,(M-N)/2,N,N]);

end

end

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