elbg.h File Reference

#include "libavutil/lfg.h"

Go to the source code of this file.

Functions
int	avpriv_do_elbg (int *points, int dim, int numpoints, int *codebook, int numCB, int num_steps, int *closest_cb, AVLFG *rand_state)
	Implementation of the Enhanced LBG Algorithm Based on the paper "Neural Networks 14:1219-1237" that can be found in http://citeseer.ist.psu.edu/patan01enhanced.html . More...
int	avpriv_init_elbg (int *points, int dim, int numpoints, int *codebook, int numCB, int num_steps, int *closest_cb, AVLFG *rand_state)
	Initialize the **codebook vector for the elbg algorithm. More...

Function Documentation

avpriv_do_elbg()

int avpriv_do_elbg	(	int *	points,
		int	dim,
		int	numpoints,
		int *	codebook,
		int	numCB,
		int	num_steps,
		int *	closest_cb,
		AVLFG *	rand_state
	)

Implementation of the Enhanced LBG Algorithm Based on the paper "Neural Networks 14:1219-1237" that can be found in http://citeseer.ist.psu.edu/patan01enhanced.html .

Parameters

points	Input points.
dim	Dimension of the points.
numpoints	Num of points in **points.
codebook	Pointer to the output codebook. Must be allocated.
numCB	Number of points in the codebook.
num_steps	The maximum number of steps. One step is already a good compromise between time and quality.
closest_cb	Return the closest codebook to each point. Must be allocated.
rand_state	A random number generator state. Should be already initialized by av_lfg_init().

Returns

< 0 in case of error, 0 otherwise

Definition at line 371 of file elbg.c.

Referenced by a64multi_encode_frame(), avpriv_init_elbg(), encode_frame(), filter_frame(), generate_codebook(), and quantize().

avpriv_init_elbg()

int avpriv_init_elbg	(	int *	points,
		int	dim,
		int	numpoints,
		int *	codebook,
		int	numCB,
		int	num_steps,
		int *	closest_cb,
		AVLFG *	rand_state
	)

Initialize the **codebook vector for the elbg algorithm.

If you have already a codebook and you want to refine it, you shouldn't call this function. If numpoints < 8*numCB this function fills **codebook with random numbers. If not, it calls avpriv_do_elbg for a (smaller) random sample of the points in **points. Get the same parameters as avpriv_do_elbg.

Returns

< 0 in case of error, 0 otherwise

Definition at line 337 of file elbg.c.

Referenced by a64multi_encode_frame(), avpriv_init_elbg(), encode_frame(), filter_frame(), generate_codebook(), and quantize().