axis_filter
struct axis_filter *h = &input->filter.h;
struct axis_filter *v = &input->filter.v;
struct axis_filter h;
struct axis_filter v;
struct axis_filter *h = &input->filter.h;
struct axis_filter *v = &input->filter.v;
normalize_abs(struct axis_filter *filter, int val)
normalize_rel(struct axis_filter *filter, int val)