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homomorphic filter slow down my program

I applied homomorphic filtering to remove glaring and shadow effect with my program. I got homomorphic filtering code from http://stackoverflow.com/questions/20155668/homomorphic-filtering-in-opencv . When I run these code seperately it runs well and it gives good response. When I merge with my existing program it is not showing any error or warning but it takes too much time to show program output. Is there any wrong way with it?