please explain, WHY you try to do this.
there is no meaningful conversion to float from binary descriptors (BRISK,ORB,etc), those are bitstrings , not numbers
again, please explain the context, seems you try to blindly copypaste a broken idea 
please explain, WHY you try to do this.
there is no meaningful conversion to float from binary descriptors (BRISK,ORB,etc), those are bitstrings , not numbers
again, please explain the context, seems you try to blindly copypaste a broken idea