histo.c

图像直方图算法

#include "extaddr.h"

extern FARPTR pImage,lpImage;

float fHistogram[256];

void Histogram(int nWidth,int nHeight)
{
	int i,j;
	unsigned int uWork;
	float fWork;
	
	fWork=nWidth; fWork*=nHeight;
	for ( i=0;i<256;i++ )	fHistogram[i]=0.0f;
	lpImage=pImage;
	for ( j=0;j<nHeight;j++ )			// 抽样生成120x96尺寸图象
	{
		for ( i=0;i<nWidth;i++ )
		{
			
			uWork=far_peek(lpImage++);
			uWork&=0x0ff;
			fHistogram[uWork]++;
		}
	}
	for ( i=0;i<256;i++ )
		fHistogram[i]/=fWork;
}