Statistics
| Branch: | Revision:

ffmpeg / libavcodec / elbg.h @ 2912e87a

History | View | Annotate | Download (2.29 KB)

1
/*
2
 * Copyright (C) 2007 Vitor Sessak <vitor1001@gmail.com>
3
 *
4
 * This file is part of Libav.
5
 *
6
 * Libav 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
 * Libav 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 Libav; 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
 */
40
void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
41
                int numCB, int num_steps, int *closest_cb,
42
                AVLFG *rand_state);
43

    
44
/**
45
 * Initialize the **codebook vector for the elbg algorithm. If you have already
46
 * a codebook and you want to refine it, you shouldn't call this function.
47
 * If numpoints < 8*numCB this function fills **codebook with random numbers.
48
 * If not, it calls ff_do_elbg for a (smaller) random sample of the points in
49
 * **points. Get the same parameters as ff_do_elbg.
50
 */
51
void ff_init_elbg(int *points, int dim, int numpoints, int *codebook,
52
                  int numCB, int num_steps, int *closest_cb,
53
                  AVLFG *rand_state);
54

    
55
#endif /* AVCODEC_ELBG_H */