文章目录
工程效果
载入图片，并在左侧显示原始图片、二值化图片和灰度图片。
双击左侧的图片控件，可以在右侧的大控件中，显示双击的图片。
初始画面：
载入图片：
双击左侧的第二个控件，显示图片：
//对图片显示在控件中的位置没有进行优化。
重要代码
主要是用的MFC Image控件。
载入图片：
void CGDITESTDlg::OnBnClickedBtnStart()
{
//获取图像文件
CFileDialog filedlg(
TRUE,
_T("png"),
NULL,
0,
TEXT("image Files(*.bmp;*.jpg;*.png)|*.bmp;*.jpg;*.png|all files(*.*)|(*.*)||"),
this);
filedlg.DoModal();
m_cstr_filepath = filedlg.GetPathName();
m_cstr_filename = filedlg.GetFileName();
if (m_cstr_filepath.IsEmpty() || m_cstr_filename.IsEmpty())
{
AfxMessageBox(TEXT("打开文件失败"));
return ;
}
image_origin.Load(m_cstr_filepath);
image_binarization.Load(m_cstr_filepath);
image_grey.Load(m_cstr_filepath);
//获取图像尺寸
imgw = image_origin.GetWidth();
imgh = image_origin.GetHeight();
img_t = imgw / imgh;
//根据图像尺寸，调整控件客户区尺寸比例
CRect rect_ctl;
m_ctl_pic_origin.GetClientRect(&rect_ctl);
float rectw = rect_ctl.Width();
float recth = rect_ctl.Height();
float rect_t = rectw / recth;
if(rect_t < img_t)
{
rect_ctl = CRect(rect_ctl.TopLeft(), CSize(rect_ctl.Width(), rect_ctl.Width() / img_t ));
}
else
{
rect_ctl = CRect(rect_ctl.TopLeft(), CSize(rect_ctl.Height() * img_t, rect_ctl.Height()));
}
//显示图像到控件客户区
CDC* pdc = m_ctl_pic_origin.GetDC();
m_ctl_pic_origin.SetBitmap(NULL);
image_origin.Draw(pdc->m_hDC, rect_ctl);
//图像二值化处理
ImageBinarizationProcess(image_binarization);
//根据图像尺寸，调整控件客户区尺寸比例
CRect rect_ctl_binarization;
m_ctl_pic_binarization.GetClientRect(&rect_ctl_binarization);
float rectw_ = rect_ctl_binarization.Width();
float recth_ = rect_ctl_binarization.Height();
float rect_t_ = rectw / recth;
if (rect_t_ < img_t)
{
rect_ctl_binarization = CRect(rect_ctl_binarization.TopLeft(), CSize(rect_ctl_binarization.Width(), rect_ctl_binarization.Width() / img_t));
}
else
{
rect_ctl_binarization = CRect(rect_ctl_binarization.TopLeft(), CSize(rect_ctl_binarization.Height() * img_t, rect_ctl_binarization.Height()));
}
//显示图像到控件客户区
CDC* pdc_ = m_ctl_pic_binarization.GetDC();
m_ctl_pic_binarization.SetBitmap(NULL);
image_binarization.Draw(pdc_->m_hDC, rect_ctl_binarization);
//图像灰度处理
ImageGreyProcess(image_grey);
//根据图像尺寸，调整控件客户区尺寸比例
CRect rect_ctl_grey;
m_ctl_pic_grey.GetClientRect(&rect_ctl_grey);
float rectw__ = rect_ctl_grey.Width();
float recth__ = rect_ctl_grey.Height();
float rect_t__ = rectw / recth;
if (rect_t__ < img_t)
{
rect_ctl_grey = CRect(rect_ctl_grey.TopLeft(), CSize(rect_ctl_grey.Width(), rect_ctl_grey.Width() / img_t));
}
else
{
rect_ctl_grey = CRect(rect_ctl_grey.TopLeft(), CSize(rect_ctl_grey.Height() * img_t, rect_ctl_grey.Height()));
}
//显示图像到控件客户区
CDC* pdc__ = m_ctl_pic_grey.GetDC();
m_ctl_pic_grey.SetBitmap(NULL);
image_grey.Draw(pdc__->m_hDC, rect_ctl_grey);
isLoadedImage = true;
m_ctl_pic_origin.ReleaseDC(pdc);
m_ctl_pic_binarization.ReleaseDC(pdc);
m_ctl_pic_grey.ReleaseDC(pdc);
}
图像二值化处理：
算法来源：C++MFC打开图片、彩图,以及对图像进行简单算法处理
void CGDITESTDlg::ImageBinarizationProcess(CImage &image)
{
BYTE* pimagedata = (BYTE*)image.GetBits(); //获取到图片内存点的位置
int width = image.GetWidth();
int height = image.GetHeight();
int pit = image.GetPitch();//图像每行字节数
int bytes_per_pixel = image.GetBPP() / 8; //获取每像素的位数除以8得到每个像素占的字节数
std::vector<int> gray(256); //初始化时自动存0，用来存放256种颜色出现的次数
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
gray.at((int)*(pimagedata + pit * i + bytes_per_pixel * j)) += 1;
}
}
int max = 0;
int sec = 0;
int localmax = 0;
int localsec = 0;
for (int i = 0; i < 256; i++)
{
if (gray[i] > max)
{
max = gray[i];
localmax = i;
}
}
for (int i = 0; i < 256; i++)
{
if (gray[i] > sec && abs(i - localmax) > 10)
{
sec = gray[i];
localsec = i;
}
}
int mid = (localmax + localsec) / 2;
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
if ((int)(*(pimagedata + pit * i + j * bytes_per_pixel)) < mid)
{
*(pimagedata + pit * i + j * bytes_per_pixel) = 0;
*(pimagedata + pit * i + j * bytes_per_pixel + 1) = 0;
*(pimagedata + pit * i + j * bytes_per_pixel + 2) = 0;
}
else
{
*(pimagedata + pit * i + j * bytes_per_pixel) = 255;
*(pimagedata + pit * i + j * bytes_per_pixel + 1) = 255;
*(pimagedata + pit * i + j * bytes_per_pixel + 2) = 255;
}
}
}
}
灰度处理：
算法来源：C++MFC打开图片、彩图,以及对图像进行简单算法处理
void CGDITESTDlg::ImageGreyProcess(CImage& image)
{
BYTE* pimagedata = (BYTE*)image.GetBits(); //获取到图片内存点的位置
int width = image.GetWidth();
int height = image.GetHeight();
int pit = image.GetPitch();//图像每行字节数
int bytes_per_pixel = image.GetBPP() / 8; //获取每像素的位数除以8得到每个像素占的字节数
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
*(pimagedata + pit * i + j * bytes_per_pixel) *= 0.114;
*(pimagedata + pit * i + j * bytes_per_pixel + 1) *= 0.587;
*(pimagedata + pit * i + j * bytes_per_pixel + 2) *= 0.299;
}
}
}
双击左侧控件的响应：
void CGDITESTDlg::OnLButtonDblClk(UINT nFlags, CPoint point)
{
if (!isLoadedImage) //如果没有加载图片，则不会执行后续代码
return;
//未使用，仅测试
CPoint ptCursor;
GetCursorPos(&ptCursor);//获取执行此函数时的鼠标位置，屏幕坐标
ClientToScreen(&point); //point是双击时的鼠标位置，坐标系是窗口客户区，所以要转换成屏幕坐标
//未使用，仅测试
CPoint ptCursor1(GetCurrentMessage()->pt); //双击时的鼠标位置，屏幕坐标
GetDlgItem(IDC_PIC_ORIGIN)->GetWindowRect(&rc_origin);//控件的rect，屏幕坐标
if (rc_origin.PtInRect(point))//如果右键在picture control区域抬起则放大显示灰度图片
{
CRect rect_ctl;
m_ctl_pic_dsp.GetClientRect(&rect_ctl);
float rectw = rect_ctl.Width();
float recth = rect_ctl.Height();
float rect_t = rectw / recth;
if (rect_t < img_t)
{
rect_ctl = CRect(rect_ctl.TopLeft(), CSize(rect_ctl.Width(), rect_ctl.Width() / img_t));
}
else
{
rect_ctl = CRect(rect_ctl.TopLeft(), CSize(rect_ctl.Height() * img_t, rect_ctl.Height()));
}
CDC* pdc = m_ctl_pic_dsp.GetDC();
m_ctl_pic_dsp.SetBitmap(NULL);
image_origin.Draw(pdc->m_hDC, rect_ctl);
m_ctl_pic_dsp.ReleaseDC(pdc);
return;
}
GetDlgItem(IDC_PIC_PROCESS)->GetWindowRect(&rc_binarization);
if (rc_binarization.PtInRect(point))//如果右键在picture control区域抬起则放大显示灰度图片
{
CRect rect_ctl;
m_ctl_pic_dsp.GetClientRect(&rect_ctl);
float rectw = rect_ctl.Width();
float recth = rect_ctl.Height();
float rect_t = rectw / recth;
if (rect_t < img_t)
{
rect_ctl = CRect(rect_ctl.TopLeft(), CSize(rect_ctl.Width(), rect_ctl.Width() / img_t));
}
else
{
rect_ctl = CRect(rect_ctl.TopLeft(), CSize(rect_ctl.Height() * img_t, rect_ctl.Height()));
}
CDC* pdc = m_ctl_pic_dsp.GetDC();
m_ctl_pic_dsp.SetBitmap(NULL);
image_binarization.Draw(pdc->m_hDC, rect_ctl);
m_ctl_pic_dsp.ReleaseDC(pdc);
return;
}
GetDlgItem(IDC_PIC_PROCESS2)->GetWindowRect(&rc_grey);
if (rc_grey.PtInRect(point))//如果右键在picture control区域抬起则放大显示灰度图片
{
CRect rect_ctl;
m_ctl_pic_dsp.GetClientRect(&rect_ctl);
float rectw = rect_ctl.Width();
float recth = rect_ctl.Height();
float rect_t = rectw / recth;
if (rect_t < img_t)
{
rect_ctl = CRect(rect_ctl.TopLeft(), CSize(rect_ctl.Width(), rect_ctl.Width() / img_t));
}
else
{
rect_ctl = CRect(rect_ctl.TopLeft(), CSize(rect_ctl.Height() * img_t, rect_ctl.Height()));
}
CDC* pdc = m_ctl_pic_dsp.GetDC();
m_ctl_pic_dsp.SetBitmap(NULL);
image_grey.Draw(pdc->m_hDC, rect_ctl);
m_ctl_pic_dsp.ReleaseDC(pdc);
return;
}
CDialogEx::OnLButtonDblClk(nFlags, point);
}
以上是通过窗口的双击时间回调函数，判断双击时鼠标的坐标，是否在控件的坐标Rect中，如果是，则执行对应代码。
也可以把双击的空间的notify属性设置为true，然后再时间中设置双击消息回调函数。
完整代码
MFC简单的图片处理工程-Gitee
参考
C++MFC打开图片、彩图,以及对图像进行简单算法处理
