vector<float> filter_table_cdf(filter_table_size+1);
vector<float> filter_table(filter_table_size+1);
float (*filter_func)(float, float) = NULL;
vector<float> filter_table_cdf(filter_table_size+1);
vector<float> filter_table(filter_table_size+1);
float (*filter_func)(float, float) = NULL;