mask2odd.c

一个有关eigenface的matlab 例程

float mask2odd[121] = {
-0.006750,  0.002082,  0.031950, -0.003364, -0.069501,  0.000000,  0.069501,  0.003364, -0.031950, -0.002082,  0.006750,
-0.016157,  0.004983,  0.076470, -0.008051, -0.166347,  0.000000,  0.166347,  0.008051, -0.076470, -0.004983,  0.016157,
-0.031850,  0.009823,  0.150748, -0.015872, -0.327927,  0.000000,  0.327927,  0.015872, -0.150748, -0.009823,  0.031850,
-0.051717,  0.015951,  0.244781, -0.025772, -0.532478,  0.000000,  0.532478,  0.025772, -0.244780, -0.015951,  0.051717,
-0.069174,  0.021335,  0.327404, -0.034471, -0.712211,  0.000000,  0.712211,  0.034471, -0.327404, -0.021335,  0.069174,
-0.076216,  0.023507,  0.360732, -0.037980, -0.784711, -0.000000,  0.784711,  0.037980, -0.360732, -0.023507,  0.076216,
-0.069174,  0.021335,  0.327404, -0.034471, -0.712211, -0.000000,  0.712211,  0.034471, -0.327404, -0.021335,  0.069174,
-0.051717,  0.015951,  0.244781, -0.025772, -0.532478, -0.000000,  0.532478,  0.025772, -0.244781, -0.015951,  0.051717,
-0.031850,  0.009823,  0.150748, -0.015872, -0.327927, -0.000000,  0.327927,  0.015872, -0.150748, -0.009823,  0.031850,
-0.016157,  0.004983,  0.076470, -0.008051, -0.166347, -0.000000,  0.166347,  0.008051, -0.076470, -0.004983,  0.016157,
-0.006750,  0.002082,  0.031950, -0.003364, -0.069501, -0.000000,  0.069501,  0.003364, -0.031950, -0.002082,  0.006750
};


float apply_mask2odd( float* image, int imagew, int imageh, int x, int y ) { 
float returnvalue; 
int mx1 = x-( 11/2) >= 0 ? 0 : ( 11/2)-x; 
int mx2 = x+( 11/2) < imagew ? 11-1 : 11-1 - (x+( 11/2) - (imagew-1)); 
int my1 = y-( 11/2) >= 0 ? 0 : ( 11/2)-y; 
int my2 = y+( 11/2) < imageh ? 11-1 : 11-1 - (y+( 11/2) - (imageh-1)); 
int imagexoffset = x - 11/2; 
int imageyoffset = y - 11/2; 

int h , k; 
returnvalue = 0; 
for(k = my1; k <= my2; k++){ 
for(h = mx1; h <= mx2; h++){ 
returnvalue += 
mask2odd[h+k* 11] * image[imagexoffset+h+imagew*(imageyoffset+k)]; 
} 
} 
return returnvalue; 
}