%GETMAPPING?returns?a?mapping?table?for?LBP?codes.
%??MAPPING?=?GETMAPPING（SAMPLESMAPPINGTYPE）?returns?a?mapping?for
%??LBP?codes?in?a?neighbourhood?of?SAMPLES?sampling
%??points.?Possible?values?for?MAPPINGTYPE?are
%???????‘u2‘???for?uniform?LBP
%???????‘ri‘???for?rotation-invariant?LBP
%???????‘riu2‘?for?uniform?rotation-invariant?LBP.
%
%??Example:
%???????I=imread（‘rice.tif‘）;
%???????MAPPING=getmapping（16‘riu2‘）;
%???????LBPHIST=lbp（I216MAPPING‘hist‘）;
%??Now?LBPHIST?contains?a?rotation-invariant?uniform?LBP
%??histogram?in?a?（162）?neighbourhood.
%

function?mapping?=?getmapping（samplesmappingtype）
%?Version?0.1
%?Authors:?Marko?Heikkil?and?Timo?Ahonen

??
mapping?=?0:2^samples-1;
newMax??=?0;?%number?of?patterns?in?the?resulting?LBP?code
index???=?0;

if?strcmp（mappingtype‘u2‘）?%Uniform?2
??newMax?=?samples*（samples-1）?+?3;?
??for?i?=?0:2^samples-1
????j?=?bitset（bitshift（i1samples）1bitget（isamples））;?%rotate?left
????numt?=?sum（bitget（bitxor（ij）1:samples））;?%number?of?1->0?and
???????????????????????????????????????????????%0->1?transitions
???????????????????????????????????????????????%in?binary?string?
????????????