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/*=================================================================
* LBPFILTER computes LBP for each 3x3 subwindow in input image.
*
* Synopsis:
* F = lbpfilter(I)
* where
* I [h x w (double)] is input image.
* F [h x w (double)] is image of LBP responses;
* the border colums and rows, for which LBP is not defined, are set 0.
*
*=================================================================*/
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <mex.h>
#include <time.h>
#include <errno.h>
#define MIN(A,B) ((A) > (B) ? (B) : (A))
#define MAX(A,B) ((A) < (B) ? (B) : (A))
#define ABS(A) ((A) < 0 ? -(A) : (A))
#define INDEX(ROW,COL,NUM_ROWS) ((COL)*(NUM_ROWS)+(ROW))
/*======================================================================
Main code plus interface to Matlab.
========================================================================*/
void mexFunction( int nlhs, mxArray *plhs[],int nrhs, const mxArray *prhs[] )
{
double *I, *P;
int w,h, x,y;
double center;
unsigned char pattern;
if( nrhs != 1 )
mexErrMsgTxt("One input argument required.\n\n"
"LBPFILTER computes LBP for each 3x3 subwindow in input image.\n"
"\n"
"Synopsis:\n"
" F = lbpfilter(I)\n"
"where\n"
" I [h x w (double)] is input image.\n"
" F [h x w (double)] is image of LBP responses; \n"
" the border colums and rows, for which LBP is not defined, are set 0.\n"
);
I = (double*)mxGetPr(prhs[0]);
h = mxGetM(prhs[0]);
w = mxGetN(prhs[0]);
plhs[0] = mxCreateDoubleMatrix(h,w,mxREAL);
P = (double*)mxGetPr(plhs[0]);
for(x=1; x < w-1; x++)
{
for(y=1; y< h-1; y++)
{
pattern = 0;
center = I[INDEX(y,x,h)];
if(I[INDEX(y-1,x-1,h)] < center) pattern = pattern | 0x01;
if(I[INDEX(y-1,x,h)] < center) pattern = pattern | 0x02;
if(I[INDEX(y-1,x+1,h)] < center) pattern = pattern | 0x04;
if(I[INDEX(y,x-1,h)] < center) pattern = pattern | 0x08;
if(I[INDEX(y,x+1,h)] < center) pattern = pattern | 0x10;
if(I[INDEX(y+1,x-1,h)] < center) pattern = pattern | 0x20;
if(I[INDEX(y+1,x,h)] < center) pattern = pattern | 0x40;
if(I[INDEX(y+1,x+1,h)] < center) pattern = pattern | 0x80;
P[INDEX(y,x,h)] = (double)pattern;
}
}
return;
}
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