graytrans.cpp

视频捕捉图片并进行灰度处理24真彩图像转换成8为灰度图像

// GrayTrans.cpp: implementation of the GrayTrans class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Express.h"
#include "GrayTrans.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

GrayTrans::GrayTrans()
{
	m_pImgDataOut=NULL;
	m_lpColorTableOut=NULL;
	m_nColorTableLengthOut=0;
	m_nBitCountOut=0;
	m_imgWidthOut=0;
	m_imgHeightOut=0;
}

GrayTrans::~GrayTrans()
{
	if (m_pImgDataOut!=NULL)
	{
		delete[] m_pImgDataOut;
		m_pImgDataOut=NULL;
	}
	if (m_lpColorTableOut!=NULL)
	{
		delete[] m_lpColorTableOut;
		m_lpColorTableOut=NULL;
	}
}
GrayTrans::GrayTrans(CSize size,int nBitCount,LPRGBQUAD lpColorTable,unsigned char *pImgData):
ImgCenterDib(size,nBitCount,lpColorTable,pImgData)
{
	m_pImgDataOut=NULL;
	m_lpColorTableOut=NULL;
	m_nColorTableLengthOut=0;
	m_nBitCountOut=0;
	m_imgWidthOut=0;
	m_imgHeightOut=0;
}
void GrayTrans::ColorToGray()
{
	if(m_nBitCount==8)
		return;
	if (m_pImgDataOut!=NULL)
	{
		delete[] m_pImgDataOut;
		m_pImgDataOut=NULL;
	}
	if (m_lpColorTableOut!=NULL)
	{
		delete[] m_lpColorTableOut;
		m_lpColorTableOut=NULL;
	}
	m_nBitCountOut=8;
	m_nColorTableLengthOut=ComputerColorTableLength(m_nBitCountOut);
	int i,j;
	if(m_nColorTableLengthOut!=0)
	{
		m_lpColorTableOut=new RGBQUAD[m_nColorTableLengthOut];
		for (i=0;i<m_nColorTableLengthOut;i++)
		{
			m_lpColorTableOut[i].rgbBlue=i;
			m_lpColorTableOut[i].rgbGreen=i;
			m_lpColorTableOut[i].rgbRed=i;
			m_lpColorTableOut[i].rgbReserved=0;
		}
	}
	int lineByteIn=(m_imgWidth*3+3)/4*4;
	m_imgWidthOut=m_imgWidth;
	m_imgHeightOut=m_imgHeight;
	int lineByteOut=(m_imgWidth*m_nBitCountOut/8+3)/4*4;
	m_pImgDataOut=new unsigned char[lineByteOut*m_imgHeight];
	for (i=0;i<m_imgHeight;i++)
	{
		for(j=0;j<m_imgWidth;j++)
		{
			*(m_pImgDataOut+i*lineByteOut+j)=
				0.11**(m_pImgData+i*lineByteIn+j*3+0)
				+0.59**(m_pImgData+i*lineByteIn+j*3+1)
				+0.30**(m_pImgData+i*lineByteIn+j*3+2)+0.5;
		}
	}
}
CSize GrayTrans::GetDimensions()
{
	if(m_pImgDataOut==NULL)
		return CSize(0,0);
	return CSize(m_imgWidthOut,m_imgHeightOut);
}