Make matrix numbers below 'X' equal to zero and help with overlaying images
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Hey guys
I am doing some image processing from HD video. I am reading the video in frame by frame, converting each frame to grey and then subtracting a template image from them.
What I am doing then is overlaying the resulting images. Or trying to anyway.
The first thing I need help with, is that really I am only interested in a certain event within the images. The event is an electrical discharge and this event shows up as pure white (255). So I want to perform a matrix operation on each image whereby I cull all the numbers less than say 250 and make them zero (but still keeping the original matrix dimensions).
The second thing is, how do I overlay the images ontop of each other so as to build up a plot showing all the locations of this event at once? (ie so I can check that the event occured evenly across an area). is imadd(X,Y) sufficient?
Thanks for any help offered
Alex
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