Lines Matching refs:Ix
69 /*Compute derivatives Ix,Iy for a subrow of img with upper left (i,j) and width chunk_width
71 inline void db_IxIyRow_f(float *Ix,float *Iy,const float * const *img,int i,int j,int chunk_width)
77 Ix[c]=img[i][j+c-1]-img[i][j+c+1];
82 /*Compute derivatives Ix,Iy for a subrow of img with upper left (i,j) and width 128
202 int Ix,Iy;
206 Ix=(img[i][j+c-1]-img[i][j+c+1])>>1;
208 dxx[c]=Ix*Ix;
209 dxx[c+128]=Ix*Iy;
621 float *Ix[5],*Iy[5];
632 Ix[i]=gyy+chunk_width_p4+(2*i*chunk_width_p4);
633 Iy[i]=Ix[i]+chunk_width_p4;
637 for(i=top-2;i<top+2;i++) db_IxIyRow_f(Ix[i%5],Iy[i%5],img,i,left-2,chunk_width_p4);
643 db_IxIyRow_f(Ix[(i+2)%5],Iy[(i+2)%5],img,(i+2),left-2,chunk_width_p4);
647 Ix[(i-2)%5],Ix[(i-1)%5],Ix[i%5],Ix[(i+1)%5],Ix[(i+2)%5],
