I want to interpolate extracted ROI. Please help me with coding.

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mounika siripurapu 2016-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/264059-i-want-to-interpolate-extracted-roi-please-help-me-with-coding

评论： mounika siripurapu 2016-1-19

 p= imread('knee.jpg');  
     figure;
   imshow(p);
   img = imcrop;
   k=imshow(img);
   imwrite(k,'knee2.jpg');
z=imread('knee2.jpg');
figure;
[x,y]=meshgrid(1:256,1:256);
a=2;
for i=1:256;
    for j=1:256;
x1(i,j)=a*x(i,j);
y1(i,j)=y(i,j)/a;
    end
end
% Do the interpolation 
z1=interp2(x,y,z,x1,y1,'bilinear');
imshow(z1);

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John D'Errico 2016-1-19

Linear interpolation will not improve image quality. That only works in the TV shows, where you can blow up a single pixel into a readable picture of a license plate. Any problems that were in the original will still be there, with sometimes new artifacts introduced.

mounika siripurapu 2016-1-19

Thank you. But what type of interpolation method can be used to improve the quality of an image by increasing number of pixels. Kindly provide me coding if possible.

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