MFC中打开任意图像并在picture control控件中显示Mat对象
2017-12-05 17:52
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最近在使用OpenCV制作车牌识别系统,我选择了使用MFC制作界面。
界面设想是点击“打开图片”去选择任意文件夹(英文名)中的图片,然后将图片显示在picture control控件中。难点就是将Mat类型的图片显示在图形控件中。
为“打开图像”这一button按钮添加单击事件:
实现效果:
添加一个函数用于向图像控件中绘制图片:
注意:CvvImage在OpenCV2.2后就没有了,所以这个版本后面的还有加上这个类
具体添加方法就是自己在项目中新建CvvImage.h和CvvImage.cpp文件并向其中加入代码:
CvvImage.h
CvvImage.cpp:
我们发现在绘制图片的那个函数中传入的参数是IplImage*,所以我们要将Mat->IplImage,很简单:IplImage img = src;
最终效果:
界面设想是点击“打开图片”去选择任意文件夹(英文名)中的图片,然后将图片显示在picture control控件中。难点就是将Mat类型的图片显示在图形控件中。
为“打开图像”这一button按钮添加单击事件:
Mat src; char path1[100] ; CString filter; CString path; filter = "All Files (*.*)|*.*|JPGtu图片(*.jpg)|*.jpg|BMP图像(*.bmp)|*.bmp|PNG图片(*.png)|*.png||"; CFileDialog dlg(TRUE, NULL, NULL, OFN_HIDEREADONLY, filter); if (dlg.DoModal() != IDOK) { MessageBoxA(NULL, "does not chose image", "ss", IDOK); return; } path = dlg.GetPathName(); path.Replace(_T("\\"), _T("\\\\"));//转移字符的转换 memset(path1, 0, sizeof(path1)); int k = path.GetAllocLength(); for (int i = 0; path[i] != 0; i++) { path1[i] = path[i]; } src = imread(path1); if (!src.data) { MessageBoxA(NULL,"could not load picture","ss",IDOK); return; }
实现效果:
添加一个函数用于向图像控件中绘制图片:
//把图像显示在 MFC图片控件里 void CLicensePlateRecognitionDlg::DrawPicToHDC(IplImage *img, UINT ID) { CDC *pDC = GetDlgItem(ID)->GetDC(); HDC hDC = pDC->GetSafeHdc(); CRect rect; GetDlgItem(ID)->GetClientRect(&rect); CvvImage cimg; cimg.CopyOf(img,3); cimg.DrawToHDC(hDC,&rect); ReleaseDC(pDC); }
注意:CvvImage在OpenCV2.2后就没有了,所以这个版本后面的还有加上这个类
具体添加方法就是自己在项目中新建CvvImage.h和CvvImage.cpp文件并向其中加入代码:
CvvImage.h
#pragma once #ifndef CVVIMAGE_CLASS_DEF #define CVVIMAGE_CLASS_DEF #include "opencv2/highgui/highgui.hpp" #include "opencv2/core/core.hpp" #include "opencv2/imgproc/imgproc.hpp" #include "opencv2/imgproc/imgproc_c.h" class CvvImage { public: CvvImage(); virtual ~CvvImage(); virtual bool Create( int width, int height, int bits_per_pixel, int image_origin = 0 ); virtual bool Load( const char* filename, int desired_color = 1 ); 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 virtual bool Save( const char* filename ); 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); 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 ); virtual void Show( const char* window ); #if defined WIN32 || defined _WIN32 virtual void Show( HDC dc, int x, int y, int width, int height, int from_x = 0, int from_y = 0 ); virtual void DrawToHDC( HDC hDCDst, RECT* pDstRect ); #endif protected: IplImage* m_img; }; typedef CvvImage CImage; #endif
CvvImage.cpp:
#include "StdAfx.h" #include "CvvImage.h" 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 1b637 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(); 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; } 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)); }
我们发现在绘制图片的那个函数中传入的参数是IplImage*,所以我们要将Mat->IplImage,很简单:IplImage img = src;
IplImage img = src; DrawPicToHDC(&img,IDC_SHOWPIC);//转换后直接调用就OK了!
最终效果:
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