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How to filter FREAK+BruteForceMatcher result?

I have 2 questions about FREAK implementation in opencv I really need to know to continue:

  1. I cannot get what the 64 values (columns) returned for each keypoint ? FREAK should return binary values as I understand?

  2. I used BruteForceMatcher<hamming> like in FREAK_demo.cpp in opencv samples. however it always give matches that may be wrong .. so I want to filter result ... I want to use the distance variable in the DMatch object returned but I cannot get what it representing in case of Hamming distance?.. should I take the big distances or small ?? what is the expected range for it ? I cannot find in any documentation