emd_histogram_lower_envelope.c

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/*
///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//   Copyright (C) 2006-2008  Beijing,  pengzhen ([e-mail])   //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////
*/

static inline void get_lower_histogram( HistogramContext* hist )
{

	UINT *hist_lower = (UINT*)hist->m_pLower ; 
	UINT *hist_data  = (UINT*)hist->m_pHistogram  ; 
	UINT *hist_pos = (UINT*)hist->m_pHistogramPos  ;

	int i , n ; 

	UINT histogram_tm[HISTTOGRAM_COUNT] ; 
	UINT histogram_id[HISTTOGRAM_COUNT] ; 
	
	UINT *hist_tm = histogram_tm ; 
	UINT *hist_id = histogram_id ; 

	//memset( hist_lower, 0, HISTTOGRAM_COUNT*4 );
	memcpy( hist_lower, hist_data, HISTTOGRAM_COUNT*4 );

	n = 0 ; 
	i = 1 ;
	hist_data ++ ; 
	while( i<HISTTOGRAM_COUNT-1 )
	{
		if( (*hist_data <= *(hist_data-1)) & 
			(*hist_data <= *(hist_data+1)) )
		{
			*hist_tm = *hist_data ; hist_tm ++ ;  
			*hist_id =  i ;         hist_id ++ ;  n ++;

		}

		hist_data ++ ;  i++ ;
	}

	hist->m_LowerCount = n ; 

	hist_tm = histogram_tm ; 
	hist_id = histogram_id ; 

	cubic_interpolation( (INT*)hist_pos, (INT*)hist_lower, (INT*)histogram_id, (INT*)histogram_tm, n ) ; 

}