Error using .' TRANSPOSE does not support N-D arrays. Use PAGETRANSP​OSE/PAGECT​RANSPOSE to transpose pages or PERMUTE to reorder dimensions of N-D arrays.

I=imread('Medidas2._preview_rev_1.png');
I=double(I);
[m, n]=size(I)
[x,y]=meshgrid(1:n, 1:m); %grid initial image
r=0.5; %scale factor
[p,q]=meshgrid(1:r:n, 1:r:m); %grid final image
I2=interp2(x,y,I,p,q,'nearest'); %interpolation
figure
subplot(1,2,1),imagesc(I),axis image
title('Original','FontSize',18)
subplot(1,2,2),imagesc(I2),axis image
title('Interpolador NN ','FontSize',18)
colormap("gray")

Error using .'

TRANSPOSE does not support N-D arrays. Use PAGETRANSPOSE/PAGECTRANSPOSE to transpose pages or

PERMUTE to reorder dimensions of N-D arrays.

Error in interp2 (line 128)

V = V.';

Error in Interpolacion (line 11)

I2=interp2(x,y,I,p,q,'nearest');

Answer 1

[Bruno Luong]

Your image I is 3D RGB not 2D

so you have to do 2D interpolation page by page

for k = size(I,3):-1:1
    I2(:,:,k) = interp2(x,y,I(:,:,k),p,q,'nearest'); %interpolation
end

[Farah M'hamed]

Thanks a lot!

Answer 2

[Matt J]

I is an RGB image. Perhaps you meant to convert it to grayscale.

[Farah M'hamed]

Thank you so much!