视觉图像：OpenCV+MFC控件显示图像-CvvImage类

1、CvvImage::Create：功能：创建一个图像；格式：bool CvvImage::Create(int w,int h,int bpp,int origin);参数：w-图像宽，h-图像高，bpp-每个像素的bit数，origin-0顶，1底；例：// 创建400行600列， IPL_DEPTH_8U类型的3通道图像， 顶—左结构CvvImage img;bool flag = img.Create(600, 400, IPL_DEPTH_8U*3, 0);

2、CvvImage::CopyOf功能：从img复制图像到当前对象；格式：void CvvImage::CopyOf(CvvImage& img, int desired_color);void CvvImage::CopyOf(IplImage* img, int desired_color);参数：img-要复制的图像。desired_color-复制后图像的通道数， 复制后图像的像素深度为8bit。示例:读一个图像，然后复制为1个3通道的彩色图像IplImage *pImg = cvLoadImage("0.jpg",1);CvvImage vImg;vImg.CopyOf(pImg,0);

3、CvvImage::Load功能：装载一个图像；格式：bool CvvImage::Load(const char* filename, int desired_color);参数：filename-图像文件名称；desired_color图像波段数；示例：img1.Load("example.tiff");

4、CvvImage::LoadRect功能：从图像读出一个区域；格式：bool CvvImage::LoadRect(const char* filename, int desired_color, CvRect rect);参数：filename-图像名称；desired_color-图像波段数，和cvLoadImage类似。rect-要读取的图像范围。【注】：LoadRect是先用Load装载一个图像；然后再将rect设置为图像的ROI区域，然后复制图像得到；示例：CvvImage img1;Rect rect1(20,20,300,300);img1.LoadRect("0.jpg",1,rect1);CRect mWinRect1;mWinRect1.left = w;//zuomWinRect1.top = h;//shangmWinRect1.right = w+300;//kuanmWinRect1.bottom = h+300;//gaoimg1.DrawToHDC(hDCDesktop,&mWinRect1);

5、函数：CvvImage::Save功能：保存图像；格式：bool CvvImage::Save(const char* filename);参数：和cvSaveImage相似；函数：CvvImage::Fill功能：以color颜色填充图像格式：void CvvImage::Fill(int color);函数：CvvImage::Show功能：显示一个图像；格式①：void CvvImage::Show(const char* window);参数：和cvShowImage相似。重载：格式②：void CvvImage::Show(HDC dc, int x, int y, int w, int h, int from_x, int from_y);功能：绘制图像的部分到DC； 图像没有缩放。此函数仅在Windows下有效；参数：dc-设备描述符；x-局部图像显示在DC上,从DC上的第x列开始。y-局部图像显示在DC上,从DC上的第y列开始。(x,y)-局部图像显示在DC上的起始位置。w-局部图像宽度。h-局部图像高度。from_x-从图像的第from_x列开始显示。from_y-从图像的第from_y行开始显示。示例:从图像10行20列开始， 显示400行600列图像到设备描述符的100行200列开始的位置CvvImage img;img.Load("example.tiff");img.Show(hDC, 200, 100, 600, 400, 20, 10);

6、CvvImage::DrawToHDC功能：绘制图像的ROI区域到DC的pDstRect；如果图像大小和pDstRect不一致，图像会拉伸/压缩；此函数仅在Windows下有效；格式：void CImage::DrawToHDC(HDC hDCDst, RECT* pDstRect);参数：hDCDst-设备描述符；pDstRect-对应的设备描述符区域；示例:MFC下调用CvvImage类成员函数：void CShowImgDlg::OnBnClickedOk(){ // TODO: 在此添加控件通知处理程序代码 //返回桌面窗口的句柄； //桌面窗口覆盖整个屏幕, //桌面窗口是一个要在其上绘制所有的图标和其他窗口的区域。 CWnd *wnd = GetDesktopWindow(); //该函数检索一指定窗口的客户区域或整个屏幕的显示设备上下文环境的句柄; //以便使用该句柄来在设备上下文环境中绘图； //返回输出设备上下文的句柄 HDC hDCDesktop = wnd->GetDC()->GetSafeHdc(); IplImage *pImg = cvLoadImage("0.jpg",1); CvvImage vImg; vImg.CopyOf(pImg,0); int w = pImg->width; int h = pImg->height; CRect mWinRect; mWinRect.left = 0;//zuo mWinRect.top = 0;//shang mWinRect.right = w;//kuan mWinRect.bottom = h;//gao vImg.DrawToHDC(hDCDesktop,&mWinRect); cvWaitKey(0); cvReleaseImage(&pImg);}

7、CvvImage.h文件#pragma once#ifndef CVVIMAGE_CLASS_DEF#define CVVIMA镟搞赃呓GE_CLASS_DEF#include "opencv.hpp"/* CvvImage class definition */class CvvImage{public: CvvImage(); virtual ~CvvImage(); /* Create image (BGR or grayscale) */ virtual bool Create( int width, int height, int bits_per_pixel, int image_origin = 0 ); /* Load image from specified file */ virtual bool Load( const char* filename, int desired_color = 1 ); /* Load rectangle from the file */ virtual bool LoadRect( const char* filename, int desired_color, CvRect r );#if defined WIN32 || defined _WIN32 virtual bool LoadRect( const char* filename, int desired_color, RECT r ) { return LoadRect( filename, desired_color, cvRect( r.left, r.top, r.right - r.left, r.bottom - r.top )); }#endif /* Save entire image to specified file. */ virtual bool Save( const char* filename ); /* Get copy of input image ROI */ virtual void CopyOf( CvvImage& image, int desired_color = -1 ); virtual void CopyOf( IplImage* img, int desired_color = -1 ); IplImage* GetImage() { return m_img; }; virtual void Destroy(void); /* width and height of ROI */ int Width() { return !m_img ? 0 : !m_img->roi ? m_img->width : m_img->roi->width; }; int Height() { return !m_img ? 0 : !m_img->roi ? m_img->height : m_img->roi->height;}; int Bpp() { return m_img ? (m_img->depth & 255)*m_img->nChannels : 0; }; virtual void Fill( int color ); /* draw to highgui window */ virtual void Show( const char* window );#if defined WIN32 || defined _WIN32 /* draw part of image to the specified DC */ virtual void Show( HDC dc, int x, int y, int width, int height, int from_x = 0, int from_y = 0 ); /* draw the current image ROI to the specified rectangle of the destination DC */ virtual void DrawToHDC( HDC hDCDst, RECT* pDstRect );#endifprotected: IplImage* m_img;};typedef CvvImage CImage;#endif

8、CvvImage.cpp文件#inclu蟠校盯昂de "StdAfx.h"#include &鳎溻趄酃quot;CvvImage.h"//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////CV_INLINE RECT NormalizeRect( RECT r );CV_INLINE RECT NormalizeRect( RECT r ){ int t; if( r.left > r.right ) { t = r.left; r.left = r.right; r.right = t; } if( r.top > r.bottom ) { t = r.top; r.top = r.bottom; r.bottom = t; } return r;}CV_INLINE CvRect RectToCvRect( RECT sr );CV_INLINE CvRect RectToCvRect( RECT sr ){ sr = NormalizeRect( sr ); return cvRect( sr.left, sr.top, sr.right - sr.left, sr.bottom - sr.top );}CV_INLINE RECT CvRectToRect( CvRect sr );CV_INLINE RECT CvRectToRect( CvRect sr ){ RECT dr; dr.left = sr.x; dr.top = sr.y; dr.right = sr.x + sr.width; dr.bottom = sr.y + sr.height; return dr;}CV_INLINE IplROI RectToROI( RECT r );CV_INLINE IplROI RectToROI( RECT r ){ IplROI roi; r = NormalizeRect( r ); roi.xOffset = r.left; roi.yOffset = r.top; roi.width = r.right - r.left; roi.height = r.bottom - r.top; roi.coi = 0; return roi;}void FillBitmapInfo( BITMAPINFO* bmi, int width, int height, int bpp, int origin ){ assert( bmi && width >= 0 && height >= 0 && (bpp == 8 || bpp == 24 || bpp == 32)); BITMAPINFOHEADER* bmih = &(bmi->bmiHeader); memset( bmih, 0, sizeof(*bmih)); bmih->biSize = sizeof(BITMAPINFOHEADER); bmih->biWidth = width; bmih->biHeight = origin ? abs(height) : -abs(height); bmih->biPlanes = 1; bmih->biBitCount = (unsigned short)bpp; bmih->biCompression = BI_RGB; if( bpp == 8 ) { RGBQUAD* palette = bmi->bmiColors; int i; for( i = 0; i < 256; i++ ) { palette[i].rgbBlue = palette[i].rgbGreen = palette[i].rgbRed = (BYTE)i; palette[i].rgbReserved = 0; } }}CvvImage::CvvImage(){ m_img = 0;}void CvvImage::Destroy(){ cvReleaseImage( &m_img );}CvvImage::~CvvImage(){ Destroy();}bool CvvImage::Create( int w, int h, int bpp, int origin ){ const unsigned max_img_size = 10000; if( (bpp != 8 && bpp != 24 && bpp != 32) || (unsigned)w >= max_img_size || (unsigned)h >= max_img_size || (origin != IPL_ORIGIN_TL && origin != IPL_ORIGIN_BL)) { assert(0); // most probably, it is a programming error return false; } if( !m_img || Bpp() != bpp || m_img->width != w || m_img->height != h ) { if( m_img && m_img->nSize == sizeof(IplImage)) Destroy(); /* prepare IPL header */ m_img = cvCreateImage( cvSize( w, h ), IPL_DEPTH_8U, bpp/8 ); } if( m_img ) m_img->origin = origin == 0 ? IPL_ORIGIN_TL : IPL_ORIGIN_BL; return m_img != 0;}void CvvImage::CopyOf( CvvImage& image, int desired_color ){ IplImage* img = image.GetImage(); if( img ) { CopyOf( img, desired_color ); }}#define HG_IS_IMAGE(img)\ ((img) != 0 && ((const IplImage*)(img))->nSize == sizeof(IplImage) &&\ ((IplImage*)img)->imageData != 0)void CvvImage::CopyOf( IplImage* img, int desired_color ){ if( HG_IS_IMAGE(img) ) { int color = desired_color; CvSize size = cvGetSize( img ); if( color < 0 ) color = img->nChannels > 1; if( Create( size.width, size.height, (!color ? 1 : img->nChannels > 1 ? img->nChannels : 3)*8, img->origin )) { cvConvertImage( img, m_img, 0 ); } }}bool CvvImage::Load( const char* filename, int desired_color ){ IplImage* img = cvLoadImage( filename, desired_color ); if( !img ) return false; CopyOf( img, desired_color ); cvReleaseImage( &img ); return true;}bool CvvImage::LoadRect( const char* filename, int desired_color, CvRect r ){ if( r.width < 0 || r.height < 0 ) return false; IplImage* img = cvLoadImage( filename, desired_color ); if( !img ) return false; if( r.width == 0 || r.height == 0 ) { r.width = img->width; r.height = img->height; r.x = r.y = 0; } if( r.x > img->width || r.y > img->height || r.x + r.width < 0 || r.y + r.height < 0 ) { cvReleaseImage( &img ); return false; } /* truncate r to source image */ if( r.x < 0 ) { r.width += r.x; r.x = 0; } if( r.y < 0 ) { r.height += r.y; r.y = 0; } if( r.x + r.width > img->width ) r.width = img->width - r.x; if( r.y + r.height > img->height ) r.height = img->height - r.y; cvSetImageROI( img, r ); CopyOf( img, desired_color ); cvReleaseImage( &img ); return true;}bool CvvImage::Save( const char* filename ){ if( !m_img ) return false; cvSaveImage( filename, m_img ); return true;}void CvvImage::Show( const char* window ){ if( m_img ) cvShowImage( window, m_img );}void CvvImage::Show( HDC dc, int x, int y, int w, int h, int from_x, int from_y ){ if( m_img && m_img->depth == IPL_DEPTH_8U ) { uchar buffer[sizeof(BITMAPINFOHEADER) + 1024]; BITMAPINFO* bmi = (BITMAPINFO*)buffer; int bmp_w = m_img->width, bmp_h = m_img->height; FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin ); from_x = MIN( MAX( from_x, 0 ), bmp_w - 1 ); from_y = MIN( MAX( from_y, 0 ), bmp_h - 1 ); int sw = MAX( MIN( bmp_w - from_x, w ), 0 ); int sh = MAX( MIN( bmp_h - from_y, h ), 0 ); SetDIBitsToDevice( dc, x, y, sw, sh, from_x, from_y, from_y, sh, m_img->imageData + from_y*m_img->widthStep, bmi, DIB_RGB_COLORS ); }}void CvvImage::DrawToHDC( HDC hDCDst, RECT* pDstRect ){ if( pDstRect && m_img && m_img->depth == IPL_DEPTH_8U && m_img->imageData ) { uchar buffer[sizeof(BITMAPINFOHEADER) + 1024]; BITMAPINFO* bmi = (BITMAPINFO*)buffer; int bmp_w = m_img->width, bmp_h = m_img->height; CvRect roi = cvGetImageROI( m_img ); CvRect dst = RectToCvRect( *pDstRect ); if( roi.width == dst.width && roi.height == dst.height ) { Show( hDCDst, dst.x, dst.y, dst.width, dst.height, roi.x, roi.y ); return; } if( roi.width > dst.width ) { SetStretchBltMode( hDCDst, // handle to device context HALFTONE ); } else { SetStretchBltMode( hDCDst, // handle to device context COLORONCOLOR ); } FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin ); ::StretchDIBits( hDCDst, dst.x, dst.y, dst.width, dst.height, roi.x, roi.y, roi.width, roi.height, m_img->imageData, bmi, DIB_RGB_COLORS, SRCCOPY ); }}void CvvImage::Fill( int color ){ cvSet( m_img, cvScalar(color&255,(color>>8)&255,(color>>16)&255,(color>>24)&255) );}