How to display an image in 3D cordinate axes ?

I want to display this image in 3D cordinate system with x,y and z axes. Pls. help me out.

Attached below is the image in question. It is a 3D image 780x1040x3 size.

Answer 1

[ANKUR KUMAR]

It is not really a 3D image. The third dimension has the RGB values. That is why you can able to see the color image.

Let's see this example.

A=imread('peppers.png');
size(A)

ans = 1×3

384 512 3

A is a 3D matrix, but RGB values are stored along the third dimension.

imshow(A)

If you plot using only the X and Y coordinate, you would get like this in each of the third dimension.

imshow(A(:,:,1))

imshow(A(:,:,2))

imshow(A(:,:,3))

The combination of these three images results into a color image.

[Shivani Limaye]

Oh okay. Then will it take a video feed to have 3D ?

Also, how can I get the X,Y & Z cordinates of all points in the image.

[ANKUR KUMAR]

X, Y and Z are just the sequence of numbers from 1 to the size along that dimension.

A=imread('peppers.png');
size(A)

ans = 1×3

384 512 3

imshow(A)

These would be your coordinates of image.

X=[1:size(A,1)];
Y=[1:size(A,2)];
Z=[1:size(A,3)];

Above are the X, Y and Z coordinates of the image. You can plot it using contourf function giving corrdinates as arguments.

figure
for index=1:3
    subplot(2,2,index)
    contourf(Y,X,A(:,:,index),'linecolor','none') 
    set(gca,'Ydir','rev')
    daspect(ones(1,3))
    title(index)
end

If you want to crop the image, you can use these dimension to crop it, followed by using imshow or contourf as per your need.

figure
for index=1:3
    subplot(2,2,index)
    contourf(Y(400:510),X(200:325),A(200:325,400:510,index),'linecolor','none') 
    set(gca,'Ydir','rev')
    daspect(ones(1,3))
    title(index) 
end

subplot(2,2,4)
imshow(A(200:325,400:510,:))