Question

您好我使用opencv从我的默认相机获取网络摄像头，我希望将其显示在Windows窗体的图片框中。我的网络摄像头出现了，但出于某种原因，我的图片框上从未显示过该Feed。因为我现在被困在这里，请有人帮助指出/解决问题。提前谢谢。

在myform.h中，我有这个代码将picturebox发送到myform.cpp文件：

System::Windows::Forms::PictureBox^ mypicbox1(void)  
{
    opencv_gui::MyForm aform;
    return aform.pictureBox1;
}

并且绘制的代码获取录像带并放入myform.cpp的我的图片框中：

void opencv_gui::DrawCvImage(const cv::Mat& cvImage)
{
    System::Windows::Forms::PictureBox^ pictureBox = mypicbox1();
    // only color images are supported
    assert(cvImage.type() == CV_8UC3);

    if ((pictureBox->Image == nullptr) || (pictureBox->Width != cvImage.cols) || (pictureBox->Height != cvImage.rows))
    {
        pictureBox->Width = cvImage.cols;
        pictureBox->Height = cvImage.rows;
        pictureBox->Image = gcnew System::Drawing::Bitmap(cvImage.cols, cvImage.rows);
    }

    // Create System::Drawing::Bitmap from cv::Mat
    System::Drawing::Bitmap^ bmpImage = gcnew System::Drawing::Bitmap(
        cvImage.cols, cvImage.rows, cvImage.step,
        System::Drawing::Imaging::PixelFormat::Format24bppRgb,
        System::IntPtr(cvImage.data)
    );

    // Draw Bitmap over a PictureBox
    System::Drawing::Graphics^ g = System::Drawing::Graphics::FromImage(pictureBox->Image);

    g->DrawImage(bmpImage, 0, 0, cvImage.cols, cvImage.rows);
    pictureBox->Refresh();

    delete g;
}


//camera feed
int opencv_gui::video_cap(void)
{
    VideoCapture cap;

    if (!cap.open(0)) // open the default camera (camera 0), use something different from 0 otherwise;
        return 0;
    for (;;)
    {
        Mat frame;
        cap >> frame;
        if (frame.empty()) break; // end of video stream
        DrawCvImage(frame);
        if (waitKey(10) == 27) break; // stop capturing by pressing ESC 
    }
    // the camera will be closed automatically upon exit
    // cap.close();
    return 0;
}

这是我的调试日志：我使用的箭头像＆＃34;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆＃34;显示重要参数和单词＆＃34; RED＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆＃34;显示错误参数。

cvImage {flags = 1124024336 dims = 2 rows = 480 ...} cv :: Mat＆amp;
allocator 0x0000000000000000 cv :: MatAllocator *







cols 640 int
数据0x0000026AC2146F80 unsigned char *               *（* cvImage）.data 0＆＃39;＆＃39; unsigned char
dataend 0x0000026AC2227F80 unsigned char *
datalimit 0x0000026AC2227F80 unsigned char *
datastart 0x0000026AC2146F80 unsigned char * dims 2 int 标志1124024336 int rows 480 int
size {p = 0x000000DBDFF0DE80} cv :: MatSize
p 0x000000DBDFF0DE80 int *               *（* cvImage）.size.p 0 int
step {p = 0x000000DBDFF0DEC8 buf = {Length = 2}} cv :: MatStep
buf {Length = 2} unsigned __int64 []
p 0x000000DBDFF0DEC8 unsigned __int64 *
u 0x0000026AA4814780 cv :: UMatData *
RED＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; bmpImage 0x0000026aa62a1fd0 {defaultTransparentColor =} System :: Drawing :: Bitmap ^
RED＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; System :: Drawing :: Image ^ 0x0000026aa62a1fd0 {nativeImage = 2657511292512 rawData = userData =} System :: Drawing :: Image ^ defaultTransparentColor System :: Drawing :: Color g System :: Drawing :: Graphics ^
RED＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; pictureBox 0x0000026aa62a1388 {borderStyle = System :: Windows :: Forms :: BorderStyle :: None image = 0x0000026aa62a1fa0 sizeMode = System :: Windows :: Forms :: PictureBoxSizeMode :: Normal ...} System :: Windows :: Forms :: PictureBox ^
RED＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; System :: Windows :: Forms :: Control ^ 0x0000026aa62a1388 {ControlKeyboardRouting = PaletteTracing = FocusTracing = ...} System :: Windows :: Forms :: Control ^ AllowDrop false bool BorderStyle System :: Windows :: Forms :: BorderStyle :: None System :: Windows :: Forms :: BorderStyle CausesValidation true bool
CreateParams 0x0000026aa62a15d8 {className = caption = style = 1442840576 ...} System :: Windows :: Forms :: CreateParams ^ DefaultImeMode System :: Windows :: Forms :: ImeMode :: Disable System :: Windows :: Forms :: ImeMode
DefaultSize {Width = 100 Height = 50} System :: Drawing :: Size EVENT_SIZEMODECHANGED 0x0000026aa629af50 System :: Object ^
ErrorImage 0x0000026aa629b110 {nativeImage = 2657511192608 rawData = userData =} System :: Drawing :: Image ^
字体0x0000026aa6280148 {}系统::绘图::字体^
ForeColor {RGB = 0x0} System :: Drawing :: Color
Image 0x0000026aa62a1fa0 {nativeImage = 2657511290992 rawData = userData =} System :: Drawing :: Image ^
[System :: Drawing :: Bitmap ^] 0x0000026aa62a1fa0 {defaultTransparentColor =} System :: Drawing :: Bitmap ^
System :: MarshalByRefObject ^ 0x0000026aa62a1fa0 {__ identity =} System :: MarshalByRefObject ^ 标志2 int
FrameDimensionsList {Length = 1} array ^ 高度480 int HorizontalResolution 96.000000 float
Palette 0x0000026aa62a25e8 {flags = 1129621568 entries = {Length = 0}} System :: Drawing :: Imaging :: ColorPalette ^
PhysicalDimension {width = 640.00000 height = 480.00000} System :: Drawing :: SizeF PixelFormat系统::绘图::成像:: PixelFormat :: Format32bppArgb系统::绘图::成像:: PixelFormat PropertyIdList {Length = 0} array ^ PropertyItems {Length = 0} array ^
RawFormat 0x0000026aa62a3488 {...} System :: Drawing :: Imaging :: ImageFormat ^
尺寸{宽度= 640高度= 480}系统::绘图::尺寸标签系统::对象^ VerticalResolution 96.000000浮动宽度640 int nativeImage 2657511290992 __int64 rawData数组^ userData System :: Object ^ ImageLocation System :: String ^
ImageRectangle {X = 0 Y = 0 Width = 640 Height = 480} System :: Drawing :: Rectangle ImeMode System :: Windows :: Forms :: ImeMode :: Disable System :: Windows :: Forms :: ImeMode
InitialImage 0x0000026aa629c568 {nativeImage = 2657511196256 rawData = userData =} System :: Drawing :: Image ^ PICTUREBOXSTATE_asyncOperationInProgress 1 int PICTUREBOXSTATE_cancellationPending 2 int PICTUREBOXSTATE_inInitialization 64 int PICTUREBOXSTATE_needToLoadImageLocation 32 int PICTUREBOXSTATE_useDefaultErrorImage 8 int PICTUREBOXSTATE_useDefaultInitialImage 4 int PICTUREBOXSTATE_waitOnLoad 16 int RightToLeft系统:: Windows :: Forms :: RightToLeft :: No System :: Windows :: Forms :: RightToLeft SizeMode System :: Windows :: Forms :: PictureBoxSizeMode :: Normal System :: Windows :: Forms :: PictureBoxSizeMode TabIndex 1 int TabStop假布尔文字＆＃34;＆＃34;系统：字符串^ WaitOnLoad假布尔 borderStyle System :: Windows :: Forms :: BorderStyle :: None System :: Windows :: Forms :: BorderStyle contentLength 0 int currentAsyncLoadOperation System :: ComponentModel :: AsyncOperation ^ 目前正在动画假布尔
defaultErrorImage 0x0000026aa629b110 {nativeImage = 2657511192608 rawData = userData =} System :: Drawing :: Image ^
defaultErrorImageForThread 0x0000026aa629b110 {nativeImage = 2657511192608 rawData = userData =} System :: Drawing :: Image ^ defaultErrorImageKey 0x0000026aa629af08 System :: Object ^
defaultInitialImage 0x0000026aa629c568 {nativeImage = 2657511196256 rawData = userData =} System :: Drawing :: Image ^
defaultInitialImageForThread 0x0000026aa629c568 {nativeImage = 2657511196256 rawData = userData =} System :: Drawing :: Image ^ defaultInitialImageKey 0x0000026aa629aef0 System :: Object ^
errorImage 0x0000026aa629b110 {nativeImage = 2657511192608 rawData = userData =} System :: Drawing :: Image ^ handleValid false bool
image 0x0000026aa62a1fa0 {nativeImage = 2657511290992 rawData = userData =} System :: Drawing :: Image ^ imageInstallationType ImageInstallationType :: DirectlySpecified ImageInstallationType imageLocation System :: String ^
initialImage 0x0000026aa629c568 {nativeImage = 2657511196256 rawData = userData =} System :: Drawing :: Image ^
[System :: Drawing :: Bitmap ^] 0x0000026aa629c568 {defaultTransparentColor =} System :: Drawing :: Bitmap ^
System :: MarshalByRefObject ^ 0x0000026aa629c568 {__identity =} System :: MarshalByRefObject ^ 标志73744 int
FrameDimensionsList {Length = 1} array ^ 高度16 int HorizontalResolution 96.000000 float
RED＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;调色板0x0000026aa629ea60 {flags = 951278840 entries = {Length = 0}} System :: Drawing :: Imaging :: ColorPalette ^
PhysicalDimension {width = 14.000000 height = 16.000000} System :: Drawing :: SizeF PixelFormat系统::绘图::成像:: PixelFormat :: Format24bppRgb系统::绘图::成像:: PixelFormat PropertyIdList {Length = 0} array ^ PropertyItems {Length = 0} array ^
RED＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; RawFormat 0x0000026aa629f900 {...} System :: Drawing :: Imaging :: ImageFormat ^
尺寸{宽度= 14高度= 16}系统::绘图::尺寸标签系统::对象^ VerticalResolution 96.000000浮动宽度14 int nativeImage 2657511196256 __int64 rawData数组^ userData System :: Object ^ RED＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt; internalSyncObject 0x0000026aa629d900 System :: Object ^ loadCompletedDelegate System :: Threading :: SendOrPostCallback ^ loadCompletedKey 0x0000026aa629af20 System :: Object ^ loadProgressChangedKey 0x0000026aa629af38 System :: Object ^ loadProgressDelegate System :: Threading :: SendOrPostCallback ^ localImageStreamReader System :: IO :: StreamReader ^
pictureBoxState {data = 12} System :: Collections :: Specialized :: BitVector32 readBlockSize 4096 int readBuffer数组^
savedSize {Width = 640 Height = 480} System :: Drawing :: Size sizeMode System :: Windows :: Forms :: PictureBoxSizeMode :: Normal System :: Windows :: Forms :: PictureBoxSizeMode tempDownloadStream System :: IO :: MemoryStream ^ totalBytesRead 0 int uriImageStream System :: IO :: Stream ^

Answer 1

不得不稍微编辑我的代码，但我几乎用我在这里提供的答案解决了我的问题： https://stackoverflow.com/a/12628861/5728859

Answer 2

试试这个

private: System::Void button2_MouseClick(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e)
{
    if (button2->Text == "Stop")
    {
        button2->Text = "Start";

    }
    else if (button2->Text == "Start")
    {
        button2->Text = "Stop";

    }

     VideoCapture capture(0);
     Mat frame;

     while (button2->Text == "Stop")
     {
         capture.read(frame);
         System::Drawing::Graphics^ graphics2 = pictureBox1->CreateGraphics();
         System::IntPtr ptr2(frame.ptr());
         System::Drawing::Bitmap^ b2 = gcnew System::Drawing::Bitmap(frame.cols,
             frame.rows, frame.step, System::Drawing::Imaging::PixelFormat::Format24bppRgb, ptr2);
         System::Drawing::RectangleF rect2(0, 0, pictureBox1->Width, pictureBox1->Height);
         graphics2->DrawImage(b2, rect2);

     }
 }

OpenCV网络摄像头提要未在PictureBox visual studio 2015

2 个答案: