mask1even.c

一个有关eigenface的matlab 例程

float mask1even[121] = {
-0.000733, -0.015229, -0.024329,  0.012068,  0.067731,  0.051447, -0.024400, -0.051866, -0.018398,  0.007574,  0.006844,
-0.015229, -0.029520,  0.017836,  0.121132,  0.111498, -0.064444, -0.165775, -0.071281,  0.035684,  0.039109,  0.007574,
-0.024329,  0.017836,  0.147033,  0.164137, -0.115411, -0.359675, -0.187521,  0.114096,  0.151675,  0.035684, -0.018398,
 0.012068,  0.121132,  0.164137, -0.140153, -0.529780, -0.335022,  0.247611,  0.399315,  0.114096, -0.071281, -0.051866,
 0.067731,  0.111498, -0.115411, -0.529780, -0.406515,  0.364763,  0.713732,  0.247611, -0.187521, -0.165775, -0.024400,
 0.051447, -0.064444, -0.359675, -0.335022,  0.364762,  0.866173,  0.364762, -0.335022, -0.359675, -0.064444,  0.051447,
-0.024400, -0.165775, -0.187521,  0.247611,  0.713732,  0.364763, -0.406515, -0.529780, -0.115411,  0.111498,  0.067731,
-0.051866, -0.071281,  0.114096,  0.399315,  0.247611, -0.335022, -0.529780, -0.140153,  0.164137,  0.121132,  0.012068,
-0.018398,  0.035684,  0.151675,  0.114096, -0.187521, -0.359675, -0.115411,  0.164137,  0.147033,  0.017836, -0.024329,
 0.007574,  0.039109,  0.035684, -0.071281, -0.165775, -0.064444,  0.111498,  0.121132,  0.017836, -0.029519, -0.015229,
 0.006844,  0.007574, -0.018398, -0.051866, -0.024400,  0.051447,  0.067731,  0.012068, -0.024329, -0.015229, -0.000733
};


float apply_mask1even( 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 += 
mask1even[h+k* 11] * image[imagexoffset+h+imagew*(imageyoffset+k)]; 
} 
} 
return returnvalue; 
}