3D Plot of an 2D .bmp image

Hi,

I am new to Matlab and having difficulties to plot an image. I try to plot an 2D colored .bmp image in a 3D plot.

My attempt was the naive one and feeding a 3D function with 2D input hoping for some descriptive error messages. Unfortunatly, the errors weren't descriptive...

lbimg = imread('x.bmp');
surf(lbimg);
Warning: Matrix dimensions must agree, not rendering mesh 
Warning: Matrix dimensions must agree, not rendering mesh

I looked up the mesh function in the doc, but did not understood how to use htis function with my image.

Can anyone help me or give me a hint what to do next?

Answer 1

[Walter Roberson]

I'm not certain from your description, but it sounds to me as if you might want to use "texture mapping", which you can find described mostly under the patch() command.

Answer 2

[Patrick Kalita]

It's a little unclear what kind of results you expected. My guess is that you have a color image which will be imported as an M-by-N-by-3 array, like this:

 >> im = imread('peppers.png');
 >> size(im)

 ans =

    384   512     3

The surf function expects an M-by-N array. So one option could be to just look at the red channel of the color image:

 >> im_red = im(:,:,1);
 >> size(im_red)

 ans =

    384   512

 >> surf(double(im_red))
 >>