File size: 1,173 Bytes
d4035c1 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 |
function mapping = getmaplbphf(samples)
%Outputs a mapping struct for uniform LBP Histogram Fourier Features
%inputs:
%samples = number of sampling points
%SEE constructhf.m for an example of usage
table = 0:2^samples-1;
index = 0;
newMax = samples*(samples-1) + 3;
table(1)= newMax-3;
table(2^samples)=newMax-2;
for i = 1:2^samples-2
j = bitset(bitshift(i,1,samples),1,bitget(i,samples)); %rotate left
numt = sum(bitget(bitxor(i,j),1:samples)); %number of 1->0 and 0->1 transitions
if numt == 2 %Uniform pattern
n=sum(bitget(i,1:samples)); %Number of 1-bits
r=find(bitget(bitand(i,bitcmp(j,samples)),1:samples)); %Rotation index of the bit pattern
r=mod( floor(n/2)+r , samples);
index = (n-1)*samples + r;
table(i+1) = index;
else %Non-uniform
table(i+1) = newMax - 1;
end
end
orbits=cell(samples+2,1);
for i=1:samples-1
orbits{i}=((i-1)*samples):(i*samples-1);
end
orbits{samples}=newMax-3;
orbits{samples+1}=newMax-2;
orbits{samples+2}=newMax-1;
mapping.table=table;
mapping.samples=samples;
mapping.num=newMax;
mapping.orbits=orbits; |