# i cant use interpolation in matlab

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ibrahim çömez il 30 Mar 2022
Commentato: Chandra il 28 Apr 2022
I wanted to get the edges of the images and interpolate them to create a 3D image. But interp3 works incorrectly or not at all.
can someone help me? how can I create a 3D image with interpolation?
how can i add interp3 to this code ?
C=double(A);
for i=1:size(C,1)-2
for j=1:size(C,2)-2
Gx=((2*C(i+2,j+1)+C(i+2,j)+C(i+2,j+2))-(2*C(i,j+1)+C(i,j)+C(i,j+2)));
Gy=((2*C(i+1,j+2)+C(i,j+2)+C(i+2,j+2))-(2*C(i+1,j)+C(i,j)+C(i+2,j)));
B(i,j)=sqrt(Gx.^2+Gy.^2);
end
end
[x y z] = ind2sub(size(B), find(B));
figure(1)
plot3(x, y, z, 'k.');
V=double(P);
for i=1:size(V,1)-2
for j=1:size(V,2)-2
Gx=((2*V(i+2,j+1)+V(i+2,j)+V(i+2,j+2))-(2*V(i,j+1)+V(i,j)+V(i,j+2)));
Gy=((2*V(i+1,j+2)+V(i,j+2)+V(i+2,j+2))-(2*V(i+1,j)+V(i,j)+V(i+2,j)));
L(i,j)=sqrt(Gx.^2+Gy.^2);
end
end
[q w e] = ind2sub(size(L), find(L));
hold on
e=e+0.01;
plot3(q, w, e, 'b.');
hold off
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### Risposta accettata

Chandra il 5 Apr 2022
Hi,
'interp3' expects the x,y,z,v inputs in meshgrid ordering
>> Vq3 = interp3(y,x,z,v,Yq,Xq,Zq); % meshgrid order for X, Y, Z, V
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Walter Roberson il 27 Apr 2022
I am confused about what k (lower-case) is in your suggestion? I do not see a k in the user code? I see a K (capital), but the user K has three panes, and interp3() by default subdivides every dimension once, so interp3() of something N x M x 3 would give a result that is (2*N-1) by (2*M-1) by 5, and you cannot imshow() something that has more than 1 pane.
I do not understand where the 3 color panes you are talking about come from?
Chandra il 28 Apr 2022
Here the images in B and L are considered as a 2D matrix as I assumed from the code mentioned, so after applying the "interp3" the output will be (2*M-1)x(2*N-1)x3, as K is two MxN matrix, here depending on the assigning value we can use k in interp3, if images are assigned to K(capital) then
k = interp3(K); % K capital in interp3 and k small in assigned value
imshow(k,[]);
%OR
K = interp3(K); % K capital in interp3 and k capital in assigned value
imshow(K,[]);

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