INDEX_DXY         340 libavfilter/vf_colorconstancy.c             const double *dxy = td->data[INDEX_DXY][plane];
INDEX_DXY         416 libavfilter/vf_colorconstancy.c         get_deriv(ctx, td, 1, DIR_Y, INDEX_TEMP, INDEX_DXY,  width , nb_threads);