我想在MFC应用程序中显示我从具有OpenCV（cvCaptureFromAVI函数）的avi文件中捕获的帧。
我是MFC的新手，但我觉得我已接近使其成功。但是，不是在图片框中显示的帧，而是在新窗口中显示它们。
cvGetWindowName始终返回空值。
有我的代码：
CWnd* hPic = 0;
hPic = GetDlgItem(IDC_STATICPIC1);
const char* szWindName = cvGetWindowName(hPic->GetSafeHwnd());
cvShowImage(szWindName, frame_copy);
答案 0 :(得分：7)
所以经过长时间的研究，我发现了一些可以使它发挥作用的东西。
解决方案是创建窗口，然后将其插入图片框。我不确定这是好习惯，但我现在还没有找到更好的东西。
cvNamedWindow("IDC_STATIC_OUTPUT", 0);
cvResizeWindow("IDC_STATIC_OUTPUT", 420, 240);
HWND hWnd = (HWND) cvGetWindowHandle("IDC_STATIC_OUTPUT");
HWND hParent = ::GetParent(hWnd);
::SetParent(hWnd, GetDlgItem(IDC_PIC1)->m_hWnd);
::ShowWindow(hParent, SW_HIDE);
cvShowImage("IDC_STATIC_OUTPUT", frame_copy);
在这种情况下，图片框称为IDC_PIC1，frame_copy是OpenCV IplImage。
希望这有助于某人。
答案 1 :(得分：7)
使用以下代码，您可以将Mat转换为CImage，然后在任何地方显示CImage：
int Mat2CImage(Mat *mat, CImage &img){
if(!mat || mat->empty())
return -1;
int nBPP = mat->channels()*8;
img.Create(mat->cols, mat->rows, nBPP);
if(nBPP == 8)
{
static RGBQUAD pRGB[256];
for (int i = 0; i < 256; i++)
pRGB[i].rgbBlue = pRGB[i].rgbGreen = pRGB[i].rgbRed = i;
img.SetColorTable(0, 256, pRGB);
}
uchar* psrc = mat->data;
uchar* pdst = (uchar*) img.GetBits();
int imgPitch = img.GetPitch();
for(int y = 0; y < mat->rows; y++)
{
memcpy(pdst, psrc, mat->cols*mat->channels());//mat->step is incorrect for those images created by roi (sub-images!)
psrc += mat->step;
pdst += imgPitch;
}
return 0;
}
答案 2 :(得分：0)
注意：如果将StretchDIBits（）方法与BITMAPINFO方法一起使用，则必须注意StretchDIBits（）期望原始OpenCV Mat :: data指针的行长度为偶数4个字节的倍数！如果没有，当你试图通过StretchDIBits（）将数据复制到DC时，你会得到怪异的剪切 - 在这里，图像不仅沿着一个角度被剪切，而且颜色也都被删除了。
这是我完全正在使用的代码版本，它还支持在目标控件的矩形中保持图像宽高比。它可能会更快一点，但它现在有效：
void AdjustAspectImageSize( const Size& imageSize,
const Size& destSize,
Size& newSize )
{
double destAspectRatio = float( destSize.width ) / float( destSize.height );
double imageAspectRatio = float( imageSize.width ) / float( imageSize.height );
if ( imageAspectRatio > destAspectRatio )
{
// Margins on top/bottom
newSize.width = destSize.width;
newSize.height = int( imageSize.height *
( double( destSize.width ) / double( imageSize.width ) ) );
}
else
{
// Margins on left/right
newSize.height = destSize.height;
newSize.width = int( imageSize.width *
( double( destSize.height ) / double( imageSize.height ) ) );
}
}
void DrawPicToHDC( Mat cvImg,
UINT nDlgID,
bool bMaintainAspectRatio /* =true*/ )
{
// Get the HDC handle information from the ID passed
CDC* pDC = GetDlgItem(nDlgID)->GetDC();
HDC hDC = pDC->GetSafeHdc();
CRect rect;
GetDlgItem(nDlgID)->GetClientRect(rect);
Size winSize( rect.right, rect.bottom );
// Calculate the size of the image that
// will fit in the control rectangle.
Size origImageSize( cvImg.cols, cvImg.rows );
Size imageSize;
int offsetX;
int offsetY;
if ( ! bMaintainAspectRatio )
{
// Image should be the same size as the control's rectangle
imageSize = winSize;
}
else
{
Size newSize;
_AdjustAspectImageSize( origImageSize,
winSize,
imageSize );
}
offsetX = ( winSize.width - imageSize.width ) / 2;
offsetY = ( winSize.height - imageSize.height ) / 2;
// Resize the source to the size of the destination image if necessary
Mat cvImgTmp;
resize( cvImg,
cvImgTmp,
imageSize,
0,
0,
INTER_AREA );
// To handle our Mat object of this width, the source rows must
// be even multiples of a DWORD in length to be compatible with
// SetDIBits(). Calculate what the correct byte width of the
// row should be to be compatible with SetDIBits() below.
int stride = ( ( ( ( imageSize.width * 24 ) + 31 ) & ~31 ) >> 3 );
// Allocate a buffer for our DIB bits
uchar* pcDibBits = (uchar*) malloc( imageSize.height * stride );
if ( pcDibBits != NULL )
{
// Copy the raw pixel data over to our dibBits buffer.
// NOTE: Can setup cvImgTmp to add the padding to skip this.
for ( int row = 0; row < cvImgTmp.rows; ++row )
{
// Get pointers to the beginning of the row on both buffers
uchar* pcSrcPixel = cvImgTmp.ptr<uchar>(row);
uchar* pcDstPixel = pcDibBits + ( row * stride );
// We can just use memcpy
memcpy( pcDstPixel,
pcSrcPixel,
stride );
}
// Initialize the BITMAPINFO structure
BITMAPINFO bitInfo;
bitInfo.bmiHeader.biBitCount = 24;
bitInfo.bmiHeader.biWidth = cvImgTmp.cols;
bitInfo.bmiHeader.biHeight = -cvImgTmp.rows;
bitInfo.bmiHeader.biPlanes = 1;
bitInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bitInfo.bmiHeader.biCompression = BI_RGB;
bitInfo.bmiHeader.biClrImportant = 0;
bitInfo.bmiHeader.biClrUsed = 0;
bitInfo.bmiHeader.biSizeImage = 0; //winSize.height * winSize.width * * 3;
bitInfo.bmiHeader.biXPelsPerMeter = 0;
bitInfo.bmiHeader.biYPelsPerMeter = 0;
// Add header and OPENCV image's data to the HDC
StretchDIBits( hDC,
offsetX,
offsetY,
cvImgTmp.cols,
cvImgTmp.rows,
0,
0,
cvImgTmp.cols,
cvImgTmp.rows,
pcDibBits,
& bitInfo,
DIB_RGB_COLORS,
SRCCOPY );
free(pcDibBits);
}
ReleaseDC(pDC);
}
答案 3 :(得分：-2)
int DrawImageToHDC（IplImage * img，HDC hdc，int xDest，int yDest，UINT iUsage，DWORD rop）
char m_chBmpBuf[2048];
BITMAPINFO *m_pBmpInfo = 0;
m_pBmpInfo = (BITMAPINFO*)m_chBmpBuf;
m_pBmpInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
m_pBmpInfo->bmiHeader.biWidth = img->width;
m_pBmpInfo->bmiHeader.biHeight = -img->height;
m_pBmpInfo->bmiHeader.biBitCount = 24;
m_pBmpInfo->bmiHeader.biPlanes = 1;
m_pBmpInfo->bmiHeader.biCompression = BI_RGB;
m_pBmpInfo->bmiHeader.biSizeImage = 0;
m_pBmpInfo->bmiHeader.biXPelsPerMeter = 0;
m_pBmpInfo->bmiHeader.biYPelsPerMeter = 0;
m_pBmpInfo->bmiHeader.biClrUsed = 0;
m_pBmpInfo->bmiHeader.biClrImportant = 0;
return StretchDIBits(hdc, xDest, yDest, img->width, img->height, 0, 0,
img->width, img->height, img->imageData, m_pBmpInfo, DIB_RGB_COLORS, SRCCOPY);
用法：DrawImageToHDC（img，pDC-＆gt; m_hDC，Area.left，Area.top，DIB_RGB_COLORS，SRCCOPY）;