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  /packages/apps/Camera/jni/feature_stab/db_vlvm/
db_metrics.h 165 inline void db_DerivativeInhomHomographyError(double Jf_dx[18],double f[2],const double y[2],const double H[9],
194 Jf_dx[0]= -x[0]*mult;
195 Jf_dx[1]= -x[1]*mult;
196 Jf_dx[2]= -mult;
197 Jf_dx[3]=0;
198 Jf_dx[4]=0;
199 Jf_dx[5]=0;
200 Jf_dx[6]=x[0]*xh_mult2;
201 Jf_dx[7]=x[1]*xh_mult2;
202 Jf_dx[8]=xh_mult2
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db_rob_image_homography.cpp 114 double back,Jf_dx[18],f[2],temp,temp2;
123 db_DerivativeCauchyInhomHomographyReprojection(Jf_dx,f,xp_i+(i<<1),H,x_i+(i<<1),one_over_scale2);
125 min_Jtf-=Jf_dx*f[0] and
126 min_Jtf-=(Jf_dx+9)*f[1] to accumulate -Jt%f*/
127 db_RowOperation9(min_Jtf,Jf_dx,f[0]);
128 db_RowOperation9(min_Jtf,Jf_dx+9,f[1]);
130 temp=Jf_dx[0]; temp2=Jf_dx[9];
131 JtJ[0]+=temp*Jf_dx[0]+temp2*Jf_dx[9]
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