Opencv学习 第二节MFC读取图像显示

本文介绍如何在MFC应用程序中使用OpenCV库显示图像。通过创建窗体工程、添加控件并编写代码,实现了从文件加载图像并在静态控件中显示的功能。涉及的关键步骤包括配置工程、加载图像、绘制图像到设备上下文。

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1.新建一个窗体程序

 

2.建立一个基于窗体的工程

3、在窗体中添加两个控件IDC_STATIC, IDC_BTN_SHOW_PIC

4.为工程配置

 

5. 实现代码

#include "stdafx.h"

#include "MFC显示图像.h"

#include "MFC显示图像Dlg.h"

#include "afxdialogex.h"

 

#include <opencv2/core/core.hpp> 

#include <opencv2/highgui/highgui.hpp>

#include<opencv2/opencv.hpp>

#include "CvvImage.h"

单击按钮事件程序中添加

void CMFC显示图像Dlg::OnBnClickedBtnShowPic()

{

    Mat mat = imread("D:\\工作测试\\OpenCV3编程入门\\OpenCV学习测试YXJ\\Debug\\1.jpg");

    CDC* pDC = GetDlgItem(IDC_STATIC)->GetDC();

    HDC hDC = pDC->GetSafeHdc();

    IplImage img = mat;

    CvvImage cimg;

    cimg.CopyOf(&img);

    CRect rect;

    GetDlgItem(IDC_STATIC)->GetClientRect(&rect);

    cimg.DrawToHDC(hDC, &rect);

    ReleaseDC(pDC);

 

}

 

6.用到函数

CvvImage.h

#ifndef CVVIMAGE_CLASS_DEF

#define CVVIMAGE_CLASS_DEF

 

#include <opencv/cv.h>

#include <opencv/highgui.h>

 

/* 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);

#endif

 

protected:

 

    IplImage* m_img;

};

 

typedef CvvImage CImage;

 

#endif

 

 

CvvImage.cpp

#include "stdafx.h"//加到工程后这个就要添上

#include "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));

}

 

输出结果:

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