数字图像处理实验三中值滤波和均值滤波实验报告

-z.数字图像处理实验三均值滤波、中值滤波的计算机实现12281166雪莹计科1202班一、实验目的：1〕熟悉均值滤波、中值滤波处理的理论根底；2〕掌握均值滤波、中值滤波的计算机实现方法；3〕学习VC++6。0的编程方法；4〕验证均值滤波、中值滤波处理理论；5〕观察均值滤波、中值滤波处理的结果。二、实验的软、硬件平台：硬件：微型图像处理系统，包括：主机，PC机；摄像机；软件：操作系统：WINDOWS2000或WINDOWS*P应用软件：VC++6.0三、实验容：1〕握高级语言编程技术；2〕编制均值滤波、中值滤波处理程序的方法；3〕编译并生成可执行文件；4〕考察处理结果。四、实验要求：1〕学习VC++确6。0编程的步骤及流程；2〕编写均值滤波、中值滤波的程序；3〕编译并改错；4〕把该程序嵌入试验二给出的界面中〔作适当修改〕；5〕提交程序及文档；6〕写出本次实验的体会。五、实验结果截图实验均值滤波采用的是3*3的方块，取周围的像素点取得其均值代替原像素点。边缘像素的处理方法是复制边缘的像素点，增加一个边框，计算里面的像素值得均值滤波。六、实验体会本次实验在前一次的实验根底上增加均值滤波和中值滤波，对于椒盐噪声的处理，发现中值滤波的效果更为好一点，而均值滤波是的整个图像变得模糊了一点，效果差异较大。本次实验更加增加了对数字图像处理的了解与学习。七、实验程序代码注释及分析//HistDemoADlg.h:头文件//#include"ImageWnd.h"#pragmaonce//CHistDemoADlg对话框classCHistDemoADlg:publicCDialogE*{//构造public: CHistDemoADlg(CWnd*pParent=NULL); //标准构造函数intnWidth; intnHeight; intnLen; intnByteWidth; BYTE*lpBackup; BYTE*lpBitmap; BYTE*lpBits; CStringFileName; CImageWndsource,dest;//对话框数据enum{IDD=IDD_HISTDEMOA_DIALOG}; protected: virtualvoidDoDataE*change(CDataE*change*pD*); //DD*/DDV支持//实现protected: HICONm_hIcon; //生成的消息映射函数virtualBOOLOnInitDialog(); af*_msgvoidOnSysmand(UINTnID,LPARAMlParam); af*_msgvoidOnPaint(); af*_msgHCURSOROnQueryDragIcon(); DECLARE_MESSAGE_MAP()public: voidLoadBitmap(void); af*_msgvoidOnOpen(); af*_msgvoidOnHist(); voidHistogramEq(void); voidNoColor(void); voidHistogramEq1(intnWidth,intnHeight,BYTE*lpInput,BYTE*lpOutput); voidMeanFilter(intnWidth,intnHeight,BYTE*lpInput,BYTE*lpOutput); voidMedianFilter(intnWidth,intnHeight,BYTE*lpInput,BYTE*lpOutput); af*_msgvoidOnBnClickedClose(); af*_msgvoidOnBnClickedMeanfilter(); af*_msgvoidOnBnClickedMedianfilter();};HistDemoADlg.cpp对HistDemoADlg.h进展具体的实现，OnOpen()函数响应ID为IDC_OPEN的按钮事件，而且会调取文件选择对话框，选取文件之后，会显示在原始图像区域显示对应的位图图像，OnHist()函数会响应ID为IDC_HIST的按钮事件，调用HistogramEq()进展直方图均衡化的处理，HistogramEq()会调用HistogramEq1()进展直方图均衡化的处理，并用dst.setImage()显示处理之后的图像，以及NoColor()函数，对原始图像转化为灰度图像之后再显示。//HistDemoADlg.cpp:实现文件//#include"stdaf*.h"#include"HistDemoA.h"#include"HistDemoADlg.h"#include"af*dialoge*.h"#ifdef_DEBUG#definenewDEBUG_NEW#endif#definePoint(*,y)lpPoints[(*)+(y)*nWidth]#definePoint1(*,y)lpPoints1[(*)+(y)*nWidth]//用于应用程序“关于〞菜单项的CAboutDlg对话框classCAboutDlg:publicCDialogE*{public: CAboutDlg();//对话框数据enum{IDD=IDD_ABOUTBO*}; protected: virtualvoidDoDataE*change(CDataE*change*pD*);//DD*/DDV支持//实现protected: DECLARE_MESSAGE_MAP()};CAboutDlg::CAboutDlg():CDialogE*(CAboutDlg::IDD){}voidCAboutDlg::DoDataE*change(CDataE*change*pD*){ CDialogE*::DoDataE*change(pD*);}BEGIN_MESSAGE_MAP(CAboutDlg,CDialogE*)END_MESSAGE_MAP()//CHistDemoADlg对话框CHistDemoADlg::CHistDemoADlg(CWnd*pParent/*=NULL*/) :CDialogE*(CHistDemoADlg::IDD,pParent){ m_hIcon=Af*GetApp()->LoadIcon(IDR_MAINFRAME); lpBitmap=0; lpBackup=0;}voidCHistDemoADlg::DoDataE*change(CDataE*change*pD*){ CDialogE*::DoDataE*change(pD*);}BEGIN_MESSAGE_MAP(CHistDemoADlg,CDialogE*) ON_WM_SYSMAND() ON_WM_PAINT() ON_WM_QUERYDRAGICON() ON_BN_CLICKED(IDC_OPEN,&CHistDemoADlg::OnOpen) ON_BN_CLICKED(IDC_HIST,&CHistDemoADlg::OnHist) ON_BN_CLICKED(IDCLOSE,&CHistDemoADlg::OnBnClickedClose) ON_BN_CLICKED(IDC_MEANFILTER,&CHistDemoADlg::OnBnClickedMeanfilter) ON_BN_CLICKED(IDC_MEDIANFILTER,&CHistDemoADlg::OnBnClickedMedianfilter)END_MESSAGE_MAP()//CHistDemoADlg消息处理程序BOOLCHistDemoADlg::OnInitDialog(){ CDialogE*::OnInitDialog(); //将“关于...〞菜单项添加到系统菜单中。//IDM_ABOUTBO*必须在系统命令围。ASSERT((IDM_ABOUTBO*&0*FFF0)==IDM_ABOUTBO*); ASSERT(IDM_ABOUTBO*<0*F000); CMenu*pSysMenu=GetSystemMenu(FALSE); if(pSysMenu!=NULL) { BOOLbNameValid; CStringstrAboutMenu;bNameValid=strAboutMenu.LoadString(IDS_ABOUTBO*); ASSERT(bNameValid); if(!strAboutMenu.IsEmpty()) { pSysMenu->AppendMenu(MF_SEPARATOR); pSysMenu->AppendMenu(MF_STRING,IDM_ABOUTBO*,strAboutMenu); } } //设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动//执行此操作SetIcon(m_hIcon,TRUE); //设置大图标SetIcon(m_hIcon,FALSE); //设置小图标//TODO:在此添加额外的初始化代码source.Create(0,L"Source",WS_CHILD|WS_VISIBLE,CRect(40,40,360,280),this,10000); dest.Create(0,L"Destination",WS_CHILD|WS_VISIBLE,CRect(400,40,720,280),this,10001); returnTRUE;//除非将焦点设置到控件，否则返回TRUE}voidCHistDemoADlg::OnSysmand(UINTnID,LPARAMlParam){ if((nID&0*FFF0)==IDM_ABOUTBO*) { CAboutDlgdlgAbout; dlgAbout.DoModal(); } else { CDialogE*::OnSysmand(nID,lParam); }}//如果向对话框添加最小化按钮，则需要下面的代码//来绘制该图标。对于使用文档/视图模型的MFC应用程序，//这将由框架自动完成。voidCHistDemoADlg::OnPaint(){ if(IsIconic()) { CPaintDCdc(this);//用于绘制的设备上下文SendMessage(WM_ICONERASEBKGND,reinterpret_cast<WPARAM>(dc.GetSafeHdc()),0); //使图标在工作区矩形中居中intc*Icon=GetSystemMetrics(SM_C*ICON); intcyIcon=GetSystemMetrics(SM_CYICON); CRectrect; GetClientRect(&rect); int*=(rect.Width()-c*Icon+1)/2; inty=(rect.Height()-cyIcon+1)/2; //绘制图标dc.DrawIcon(*,y,m_hIcon); } else { CDialogE*::OnPaint(); }}//当用户拖动最小化窗口时系统调用此函数取得光标//显示。HCURSORCHistDemoADlg::OnQueryDragIcon(){ returnstatic_cast<HCURSOR>(m_hIcon);}voidCHistDemoADlg::LoadBitmap(){ //位图文件：BITMAPFILEHEADER+BITMAPINFOHEADER+有效信息局部BITMAPINFOHEADER*pInfo;//位图文件的头部信息指针pInfo pInfo=(BITMAPINFOHEADER*)(lpBitmap+sizeof(BITMAPFILEHEADER));//pInfo指向位图文件的头部信息nWidth=pInfo->biWidth;//图片宽度nByteWidth=nWidth*3;//字节宽度if(nByteWidth%4)nByteWidth+=4-(nByteWidth%4);//使字节宽度为4的整数倍nHeight=pInfo->biHeight; //图片高度if(pInfo->biBitCount!=24)//位图的位深度不为24 { if(pInfo->biBitCount!=8)//位深度不为8 { Af*MessageBo*(L"无效位图"); deletelpBitmap; lpBitmap=0; return; } //位深度为8 unsignedintPaletteSize=1<<pInfo->biBitCount;//左移8位，PaletteSize调色板尺寸if(pInfo->biClrUsed!=0&&pInfo->biClrUsed<PaletteSize)PaletteSize=pInfo->biClrUsed;//biClrUsed位图实际使用的颜色表中的颜色数lpBits=lpBitmap+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);//lpBits指向有效信息局部RGBQUAD*pPalette=(RGBQUAD*)lpBits;//颜色表局部/* typedefstructtagRGBQUAD{ BYTErgbBlue; BYTErgbGreen; BYTErgbRed; BYTErgbReserved; }RGBQUAD; */ lpBits+=sizeof(RGBQUAD)*PaletteSize;//lpBits指向图像有效信息局部nLen=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+nByteWidth*nHeight;//整个位图文件的长度BYTE*lpTemp=lpBitmap; lpBitmap=newBYTE[nLen]; BITMAPFILEHEADERbmh; BITMAPINFOHEADERbmi; bmh.bfType='B'+'M'*256; bmh.bfSize=nLen; bmh.bfReserved1=0; bmh.bfReserved2=0; bmh.bfOffBits=54; bmi.biSize=sizeof(BITMAPINFOHEADER); bmi.biWidth=nWidth; bmi.biHeight=nHeight; bmi.biPlanes=1; bmi.biBitCount=24; bmi.bipression=BI_RGB; bmi.biSizeImage=0; bmi.bi*PelsPerMeter=0; bmi.biYPelsPerMeter=0; bmi.biClrUsed=0; bmi.biClrImportant=0; intnBWidth=pInfo->biWidth; if(nBWidth%4)nBWidth+=4-(nBWidth%4); memset(lpBitmap,0,nLen); memcpy(lpBitmap,&bmh,sizeof(BITMAPFILEHEADER));//位图文件头部memcpy(lpBitmap+sizeof(BITMAPFILEHEADER),&bmi,sizeof(BITMAPINFOHEADER));//位图信息头部BYTE*lpBits2=lpBitmap+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);//位图图像信息局部int*,y,p1,p2,Palette; for(y=0;y<nHeight;y++) { for(*=0;*<nWidth;*++) { p1=y*nBWidth+*; p2=y*nByteWidth+**3; if(lpBits[p1]<PaletteSize)Palette=lpBits[p1]; elsePalette=0; lpBits2[p2]=pPalette[Palette].rgbBlue; lpBits2[p2+1]=pPalette[Palette].rgbGreen; lpBits2[p2+2]=pPalette[Palette].rgbRed; } } deletelpTemp; } lpBits=lpBitmap+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER); if(lpBackup)deletelpBackup; lpBackup=newBYTE[nLen]; memcpy(lpBackup,lpBitmap,nLen);}voidCHistDemoADlg::OnOpen()//点击翻开文件之后，对应的事件处理函数{//TODO:在此添加控件通知处理程序代码CFileFile; CFileDialogdlg(TRUE,0,0,OFN_HIDEREADONLY,L"位图文件|*.bmp|所有文件|*.*||",this);//新建文件选择对话框if(dlg.DoModal()==IDOK) { FileName=dlg.GetPathName();//得到文件的路径if(!File.Open(FileName,CFile::modeRead))return;//以只读方式翻开文件//TODO:addloadingcodehere if(lpBitmap)deletelpBitmap; //保证lpBitmap为空nLen=(int)File.GetLength();//得到文件的长度lpBitmap=newBYTE[nLen]; //为lpBitmap分配空间File.Read(lpBitmap,nLen); //将文件的容读入到lpBitmap所指向的存区域LoadBitmap(); //调用LoadBitmap()，加载位图图像if(lpBitmap)source.SetImage(nWidth,nHeight,lpBits); }}voidCHistDemoADlg::OnHist(){ //TODO:在此添加控件通知处理程序代码HistogramEq();}voidGetPoints(intnWidth,intnHeight,BYTE*lpBits,BYTE*lpPoints){ int*,y,p; intnByteWidth=nWidth*3; if(nByteWidth%4)nByteWidth+=4-(nByteWidth%4); for(y=0;y<nHeight;y++)//每一行 {for(*=0;*<nWidth;*++)//每一列 {p=**3+y*nByteWidth; lpPoints[*+y*nWidth]=(BYTE)(0.299*(float)lpBits[p+2]+0.587*(float)lpBits[p+1]+0.114*(float)lpBits[p]+0.1);//三种颜色的比例计算对应点的颜色值，并且强制转换成BYTE } }}voidPutPoints(intnWidth,intnHeight,BYTE*lpBits,BYTE*lpPoints)//逐个对lpBits进展赋值{intnByteWidth=nWidth*3; if(nByteWidth%4)nByteWidth+=4-(nByteWidth%4); int*,y,p,p1;for(y=0;y<nHeight;y++)//每一行 {for(*=0;*<nWidth;*++)//每一列 {p=**3+y*nByteWidth; p1=*+y*nWidth; lpBits[p]=lpPoints[p1]; lpBits[p+1]=lpPoints[p1]; lpBits[p+2]=lpPoints[p1]; } }}voidCHistDemoADlg::HistogramEq(void){ if(lpBitmap==0)return; BYTE*lpOutput=newBYTE[nByteWidth*nHeight]; HistogramEq1(nWidth,nHeight,lpBits,lpOutput); dest.SetImage(nWidth,nHeight,lpOutput);//在直方图均衡化的区域显示结果deletelpOutput; NoColor();//将原始图像转换成灰度图像}voidCHistDemoADlg::NoColor(){ if(lpBitmap==0)return; int*,y,p; BYTEPoint; for(y=0;y<nHeight;y++)//每一行 {for(*=0;*<nWidth;*++)//每一列 {p=**3+y*nByteWidth; Point=(BYTE)(0.299*(float)lpBits[p+2]+0.587*(float)lpBits[p+1]+0.114*(float)lpBits[p]+0.1);//计算颜色值，在0-255的灰度级之间lpBits[p+2]=Point; lpBits[p+1]=Point; lpBits[p]=Point; } } source.SetImage(nWidth,nHeight,lpBits);//将彩色图像转化成灰度图像}voidCHistDemoADlg::HistogramEq1(intnWidth,intnHeight,BYTE*lpInput,BYTE*lpOutput){ int*,y; BYTE*lpPoints=newBYTE[nWidth*nHeight];//像素点的个数GetPoints(nWidth,nHeight,lpInput,lpPoints);//lpPoints存的是颜色值intr[256],s[256];//颜色值数组，统计对应颜色值像素点的个数ZeroMemory(r,1024); ZeroMemory(s,1024); for(y=0;y<nHeight;y++){//统计对应颜色值像素点的个数,Point(*,y)是lpPoints〔*,y〕for(*=0;*<nWidth;*++){ r[Point(*,y)]++; } } s[0]=r[0]; for(y=1;y<256;y++) { s[y]=s[y-1]; s[y]+=r[y]; }//计算颜色值的前y种颜色的总像素点的个数〔像素点颜色值<=y〕for(y=0;y<nHeight;y++){//将计算对应点的像素值，直方图均匀化的结果保存在lpPoints for(*=0;*<nWidth;*++){ Point(*,y)=s[Point(*,y)]*255/nWidth/nHeight; } } PutPoints(nWidth,nHeight,lpOutput,lpPoints);//输出lpPoints到lpOutput deletelpPoints;}voidCHistDemoADlg::OnBnClickedClose(){ //TODO:在此添加控件通知处理程序代码//E*itProcess(0);//注意使用时先释放分配的存,以免造成存泄露//e*it(0);//正常终止程序;e*it(非0〕非正常终止程序PostQuitMessage(0);//最常用}voidCHistDemoADlg::OnBnClickedMeanfilter(){ //TODO:在此添加控件通知处理程序代码if(lpBitmap==0)return; BYTE*lpOutput=newBYTE[nByteWidth*nHeight]; MeanFilter(nWidth,nHeight,lpBits,lpOutput); dest.SetImage(nWidth,nHeight,lpOutput);//在直方图均衡化的区域显示结果deletelpOutput; NoColor();//将原始图像转换成灰度图像}voidCHistDemoADlg::MeanFilter(intnWidth,intnHeight,BYTE*lpInput,BYTE*lpOutput){ int*,y; BYTE*lpPoints=newBYTE[nWidth*nHeight];//像素点的个数BYTE*lpPoints1=newBYTE[(nWidth+2)*(nHeight+2)]; GetPoints(nWidth,nHeight,lpInput,lpPoints);//lpPoints存的是颜色值for(y=1;y<nHeight+1;y++){//中间最整块图像的拷贝for(*=1;*<nWidth;*++){ Point1(*,y)=Point(*-1,y-1); //lpPoints1[y][*]=lpPoints[y-1][*-1]; } } for(y=1;y<nHeight+1;y++){//最左边和最右边一列的拷贝Point1(0,y)=Point(0,y-1); Point1(nWidth+1,y)=Point(nWidth-1,y-1); //lpPoints1[y][0]=lpPoints[y-1][0]; //lpPoints1[y][nWidth+1]=lpPoints[y-1][nWidth-1]; } for(*=0;*<nWidth+2;*++){//最上边和最下边一行的拷贝Point1(*,0)=Point1(*,1); Point1(*,nHeight+1)=Point1(*,nHeight); //lpPoints1[0][*]=lpPoints1[1][*]; //lpPoints1[nHeight+1][*]=lpPoints1[nHeight][*]; } for(y=0;y<nHeight;y++){//求以*点为中心的九个数平均值for(*=0;*<nWidth;*++){ Point(*,y)=(Point1(*,y)+Point1(*+1,y)+Point1(*+2,y)+ Point1(*,y+1)+Point1(*+1,y+1)+Point1(*+2,y+1)+ Point1(*,y+2)+Point1(*+1,y+2)+Point1(*+2,y+2))/9; /* lpPoints[y][*]=(lpPoints1[y][*]+lpPoints1[y][*+1]+lpPoints1[y][*+2]+ lpPoints1[y+1][*]+lpPoints1[y+1][*+1]+lpPoints1[y+1][*+2]+ lpPoints1[y+2][*]+lpPoints1[y+2][*+1]+lpPoints1[y+2][*+2])/9; */ } } PutPoints(nWidth,nHeight,lpOutput,lpPoints);//输出lpPoints到lpOutput deletelpPoints;}voidCHistDemoADlg::MedianFilter(intnWidth,intnHeight,BYTE*lpInput,BYTE*lpOutput){ int*,y; BYTE*lpPoints=newBYTE[nWidth*nHeight];//像素点的个数BYTE*lpPoints1=newBYTE[(nWidth+2)*(nHeight+2)]; GetPoints(nWidth,nHeight,lpInput,lpPoints);//lpPoints存的是颜色值for(y=1;y<nHeight+1;y++){//中间一整块拷贝for(*=1;*<nWidth;*++){ Point1(*,y)=Point(*-1,y-1); } } for(y=1;y<nHeight+1;y++){//最左边和最右边一列的拷贝Point1(0,y)=Point(0,y-1); Point1(nWidth+1,y)=Point(nWidth-1,y-1); } for(*=0;*<nWidth+2;*++){//最上边和最下边一行的拷贝Point1(*,0)=Point1(*,1); Point1(*,nHeight+1)=Point1(*,nHeight); } BYTE*window=newBYTE[9]; for(y=0;y<nHeight;y++){ for(*=0;*<nWidth;*++){ intk=0; for(inti=y;i<=y+2;i++){ for(intj=*;j<=*+2;j++){ if(k<9) window[k++]=Point1(j,i); } } for(intm=0;m<5;++m)//求9个数的中值，window[4]为中值 { intmin=m; for(intn=m+1;n<9;++n) if(window[n]<window[min]) min=n; //Putfoundminimumelementinitsplace BYTEtemp=window[m]; window[m]=window[min]; window[min]=temp; } Point(*,y)=window[4]; } } PutPoints(nWidth,nHeight,lpOutput,lpPoints);//输出lpPoints到lpOutput deletelpPoints;}voidCHistDemoADlg::OnBnClickedMedianfilter(){ //TODO:在此添加控件通知处理程序代码if(lpBitmap==0)return; BYTE*lpOutput=newBYTE[nByteWidth*nHeight]; MedianFilter(nWidth,nHeight,lpBits,lpOutput); dest.SetImage(nWidth,nHeight,lpOutput);//在中值滤波的区域显示结果deletelpOutput; NoColor();//将原始图像转换成灰度图像}CImageWnd.h类继承自CWnd主要是图像显示方面的函数，如水平滚轮和垂直滚轮的事件函数，以及绘制函数OnPaint(),初始化函数等等，以及存放需要绘制的图像信息的成员变量。setImage()，外接提供绘制的信息，通过参数传递给部的成员变量。#pragmaonceclassCImageWnd:publicCWnd{public: intHCurrentPosition;//当前位置〔水平〕intHScrollMa*; //滑动最大位置〔水平〕intHScrollPosition; //滑动位置〔水平〕intVCurrentPosition;//当前位置〔垂直〕intVScrollMa*;//滑动最大位置〔垂直〕intVScrollPosition;//滑动位置〔垂直〕intnWidth; //宽度intnHeight; //高度intnByteWidth; //字节宽度BYTE*lpBits; //指向字节的指针public: CImageWnd(void); ~CImageWnd(void); voidSetImage(intc*,intcy,constvoid*bits); voidSetScroll(intc*,intcy);protected: af*_msgBOOLOnEraseBkgnd(CDC*pDC); af*_msgvoidOnHScroll(UINTnSBCode,UINTnPos,CScrollBar*pScrollBar); af*_msgvoidOnVScroll(UINTnSBCode,UINTnPos,CScrollBar*pScrollBar); af*_msgvoidOnPaint(); af*_msgintOnCreate(LPCREATESTRUCTlpCreateStruct); DECLARE_MESSAGE_MAP()/*protected: //{{AF*_MSG(CImageWnd) af*_msgBOOLOnEraseBkgnd(CDC*pDC); af*_msgvoidOnHScroll(UINTnSBCode,UINTnPos,CScrollBar*pScrollBar); af*_msgvoidOnVScroll(UINTnSBCode,UINTnPos,CScrollBar*pScrollBar); af*_msgvoidOnPaint(); af*_msgintOnCreate(LPCREATESTRUCTlpCreateStruct); //}}AF*_MSG DECLARE_MESSAGE_MAP()*/};ImageWnd.cpp具体实现ImageWnd.h的一些功能函数，注释已经给出，在此不再赘述。#include"StdAf*.h"#include"ImageWnd.h"#defineBACKGROUNDRGB(128,128,128)CImageWnd::CImageWnd(void)//初始化，将其全设为0{ HScrollPosition=0; HCurrentPosition=0; HScrollMa*=0; VScrollPosition=0; VCurrentPosition=0; VScrollMa*=0; lpBits=0;}CImageWnd::~CImageWnd(void)//析构函数，释放空间{if(lpBits)deletelpBits;}BEGIN_MESSAGE_MAP(CImageWnd,CWnd) //{{AF*_MSG_MAP(CImageWnd) ON_WM_ERASEBKGND() ON_WM_HSCROLL() ON_WM_VSCROLL() ON_WM_PAINT() ON_WM_CREATE() //}}AF*_MSG_MAPEND_MESSAGE_MAP()BOOLCImageWnd::OnEraseBkgnd(CDC*pDC)//设置背风光，320,240{ if(!lpBits)pDC->FillSolidRect(0,0,320,240,BACKGROUND); returnTRUE;}voidCImageWnd::OnPaint()//绘制函数，每次需要显示的图像发生变化，就会重画，重复调用这个函数进展重画{CPaintDCdc(this);//当前对象作为参数if(lpBits) { int*,y; *=-HScrollPosition; y=-VScrollPosition; if(nWidth<320)*=(320-nWidth)/2; if(nHeight<240)y=(240-nHeight)/2; //设置绘制位图文件的头信息BITMAPINFOHEADERbmi; bmi.biSize=sizeof(BITMAPINFOHEADER); bmi.biWidth=nWidth; bmi.biHeight=nHeight; bmi.biPlanes=1; bmi.biBitCount=24; bmi.bipression=BI_RGB; bmi.biSizeImage=0; bmi.bi*PelsPerMeter=0; bmi.biYPelsPerMeter=0; bmi.biClrUsed=0; bmi.biClrImportant=0; //将像素点填充到绘图区域StretchDIBits(dc.m_hDC,*,y,nWidth,nHeight,0,0,nWidth,nHeight,lpBits,(BITMAPINFO*)&bmi,DIB_RGB_COLORS,SRCCOPY); }}voidCImageWnd::OnHScroll(UINTnSBCode,UINTnPos,CScrollBar*pScrollBar)//水平滚轮事件处理函数，{switch(nSBCode) { caseSB_LINEDOWN://每次滑动的间隔为5个像素点HScrollPosition+=5; break; caseSB_LINEUP: HScrollPosition-=5; break; caseSB_PAGEDOWN://滑到最底端HScrollPosition+=320; break; caseSB_PAGEUP://滑到最顶端HScrollPosition-=320; break; caseSB_THUMBPOSITION: caseSB_THUMBTRACK: HScrollPosition=nPos; break; } if(HScrollPosition<0)HScrollPosition=0;//滑动位置小于0，设为0 if(HScrollPosition>HScrollMa*)HScrollPosition=HScrollMa*;//滑动位置大于最大值，设为最大值SetScrollPos(SB_HORZ,HScrollPosition);//水平方向滑动距离if(HCurrentPosition!=HScrollPosition)//HCurrentPosition和HScrollPosition不相等就滑动 {ScrollWindow(HCurrentPo