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