/* * Copyright (C) 2007 Vitor Sessak <vitor1001@gmail.com> * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_ELBG_H #define AVCODEC_ELBG_H #include "libavutil/lfg.h" /** * Implementation of the Enhanced LBG Algorithm * Based on the paper "Neural Networks 14:1219-1237" that can be found in * http://citeseer.ist.psu.edu/patan01enhanced.html . * * @param points Input points. * @param dim Dimension of the points. * @param numpoints Num of points in **points. * @param codebook Pointer to the output codebook. Must be allocated. * @param numCB Number of points in the codebook. * @param num_steps The maximum number of steps. One step is already a good compromise between time and quality. * @param closest_cb Return the closest codebook to each point. Must be allocated. * @param rand_state A random number generator state. Should be already initialized by av_lfg_init(). */ void ff_do_elbg(int *points, int dim, int numpoints, int *codebook, int numCB, int num_steps, int *closest_cb, AVLFG *rand_state); /** * Initialize the **codebook vector for the elbg algorithm. If you have already * a codebook and you want to refine it, you shouldn't call this function. * If numpoints < 8*numCB this function fills **codebook with random numbers. * If not, it calls ff_do_elbg for a (smaller) random sample of the points in * **points. Get the same parameters as ff_do_elbg. */ void ff_init_elbg(int *points, int dim, int numpoints, int *codebook, int numCB, int num_steps, int *closest_cb, AVLFG *rand_state); #endif /* AVCODEC_ELBG_H */