Build the 2-d Basis Tree for fingerprint compression
btree = BuildFBITree(D);
maximum depth of splitting (>= 4)
basis-quadtree of the fingerprint basis
The FBI uses a specific wavelet packet basis to compress fingerprints. BuildFBITree returns this basis.
IAFIS-IC-0110v2. "WSQ Gray-Scale Fingerprint Image Compression
Specification. Version 2," U.S. Dept. of Justice, Federal
Bureau of Investigation, 10 Feburary 1993.