MATLAB: Frame Difference

Question

In the frame difference method,on converting an image to frame,i have got an error in the following statement:

M(i-1)=im2frame(unit8(fg),gray);

fg is gray image.

the error is :

Indexed movie data values must be legal color map indices:
1.0<=value<=length(colormap) for double-precision movie data,and
0<=value<=length(colormap)-1 for unit8 movie data.

plzz tell me how can i fix this error?

Answer 1

The default size of the colormap for gray() is smaller than 256 elements. You need to use

M(i-1)=im2frame(uint8(fg),gray(256));