Brief descriptors vs opencv brief descriptors

[protobits]

Hi,
I'm using your brief descriptor implementation, migrating from opencv. I'm getting quite lower number of matches. Are the descriptor bits supposed to be comparable to those return by opencv?
Also, I see that opencv uses integral image to apply blur. For your implementation I'm applying your gaussian blur code, this maybe results in different descriptors but I'm not sure if it should be that drastic.

Thanks