ab711b5b7cedc474d00e57be60dc4bc4f5a9a7f7

1 /*

2 * Copyright (C) 2007 Vitor <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 */

23 /**

24 * Implementation of the Enhanced LBG Algorithm

25 * Based on the paper "Neural Networks 14:1219-1237" that can be found in

26 * http://citeseer.ist.psu.edu/patan01enhanced.html .

27 *

28 * @param points Input points.

29 * @param dim Dimension of the points.

30 * @param numpoints Num of points in **points.

31 * @param codebook Pointer to the output codebook. Must be allocated.

32 * @param numCB Number of points in the codebook.

33 * @param num_steps The maximum number of steps. One step is already a good compromise between time and quality.

34 * @param closest_cb Return the closest codebook to each point. Must be allocated.

35 * @param rand_state A random number generator state. Should be already initialised by av_init_random.

36 */

41 /**

42 * Initialize the **codebook vector for the elbg algorithm. If you have already

43 * a codebook and you want to refine it, you shouldn't call this function.

44 * If numpoints < 8*numCB this function fills **codebook with random numbers.

45 * If not, it calls ff_do_elbg for a (smaller) random sample of the points in

46 * **points. Get the same parameters as ff_do_elbg.

47 */