MATLAB: Resizing images using interp1()

imagematrix manipulation

So I have got this image that I am trying to resize which I have already attached. The requirement for me is to resize the image without using the functions imresize() or immse() but use interp1(). And I have no clue where exactly to begin.

Best Answer

I = imread('lighthouse.png') ;
N = 1000 ;   % interp1 along row 
[m,n,p] = size(I) ;
iwant = zeros(m,N,p) ;
xi = linspace(1,n,N) ;
for i = 1:m
    for j = 1:p
        T = interp1(1:n,double(I(i,:,j)),xi) ;
        iwant(i,:,j) = T ;
    end
end
iwant = uint8(iwant) ;
imshow(iwant)
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