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A low pass,Hight pass and fusion image in matlab

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For my class work I have to run a low pass filter on one image,Then a hight pass filter on another image and at last fuse those results using an mean function and crate a new image..

I have searched and found some usefull codes in matlab..Does any one have some sources that I can use them too?some example codes or sth like that?


I also may need to define a Threshold and set some pixels of image that are more than this Threshold to 0 ..What is the best way to do this?

Thaks a lot for your help 

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