converting grey-scale img => mask

Hi,

Apologies if this is a stupid question - I'm new to OpenCv. I am 
trying to detect movement in an image as a pre-cursor to other 
analysis and so far have the following steps:

1. Subtract prev frame from current frame to give me an image composed 
of pixels that have changed between the two frames.
2. Converted this to HSV and extracted the value channel - the 
brightness of this channel gives an indication of the level of 
movement.
3. Now I want to convert the val image to a mask (preferably with a 
threshold!) and apply this to my original image.

Any help with step 3 would be appreciated!

Many thanks,
Chris Hutchins





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