MATLAB: Chroma Keyer

Question

Hi All

I am roughing out the code for a basic keyer which will eventually go into Nuke. At the moment I have separated an image into the three channels. What I now want to do is to place the data into a 3d scatter plot before I can go further.

When I try to do this I am getting an error saying that the vector lengths are not the same.

here are the three variables containing the RGB data.

r                 389x512              1593344  double              
g                 389x512              1593344  double              
b                 389x512              1593344  double

All values within are normalised between 0 and 1.

As you can see they are equal in size, but no joy with scatter3.

Any help with this would be ultra cool.

Thank you in advance

David

Answer 1

The inputs to scatter3 need to be vectors, not matrices. Try this:

scatter3(r(:),g(:),b(:))