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50 lines
2.2 KiB
50 lines
2.2 KiB
/* |
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* Copyright (C) 2007 Vitor <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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#include "random.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 initialised by av_init_random. |
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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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AVRandomState *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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AVRandomState *rand_state);
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