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/libavcodec/elbg.h

http://github.com/FFmpeg/FFmpeg
C Header | 57 lines | 10 code | 5 blank | 42 comment | 0 complexity | 5faa7c303124a7631998d3f0e2f58576 MD5 | raw file
 1/*
 2 * Copyright (C) 2007 Vitor Sessak <vitor1001@gmail.com>
 3 *
 4 * This file is part of FFmpeg.
 5 *
 6 * FFmpeg is free software; you can redistribute it and/or
 7 * modify it under the terms of the GNU Lesser General Public
 8 * License as published by the Free Software Foundation; either
 9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#ifndef AVCODEC_ELBG_H
22#define AVCODEC_ELBG_H
23
24#include "libavutil/lfg.h"
25
26/**
27 * Implementation of the Enhanced LBG Algorithm
28 * Based on the paper "Neural Networks 14:1219-1237" that can be found in
29 * http://citeseer.ist.psu.edu/patan01enhanced.html .
30 *
31 * @param points Input points.
32 * @param dim Dimension of the points.
33 * @param numpoints Num of points in **points.
34 * @param codebook Pointer to the output codebook. Must be allocated.
35 * @param numCB Number of points in the codebook.
36 * @param num_steps The maximum number of steps. One step is already a good compromise between time and quality.
37 * @param closest_cb Return the closest codebook to each point. Must be allocated.
38 * @param rand_state A random number generator state. Should be already initialized by av_lfg_init().
39 * @return < 0 in case of error, 0 otherwise
40 */
41int avpriv_do_elbg(int *points, int dim, int numpoints, int *codebook,
42               int numCB, int num_steps, int *closest_cb,
43               AVLFG *rand_state);
44
45/**
46 * Initialize the **codebook vector for the elbg algorithm. If you have already
47 * a codebook and you want to refine it, you shouldn't call this function.
48 * If numpoints < 8*numCB this function fills **codebook with random numbers.
49 * If not, it calls avpriv_do_elbg for a (smaller) random sample of the points in
50 * **points. Get the same parameters as avpriv_do_elbg.
51 * @return < 0 in case of error, 0 otherwise
52 */
53int avpriv_init_elbg(int *points, int dim, int numpoints, int *codebook,
54                 int numCB, int num_steps, int *closest_cb,
55                 AVLFG *rand_state);
56
57#endif /* AVCODEC_ELBG_H */