OpenCV表单应用程序 - 将Mat转换为灰度

OpenCV form application- convert Mat to Grayscale

本文关键字:转换 灰度 Mat 表单 应用程序 OpenCV      更新时间:2023-10-16

我有问题,理论上很容易,但是...只是理论上:)我想将垫帧图像转换为灰度。我知道我应该使用这样的东西:

cv:

:cvtColor(frameA1, grayImageA1, CV_BGR2GRAY);

但结果是这样的:

http://i57.tinypic.com/jfvodt.jpg

我不知道为什么转换为灰度后我有 3 张图像。这是我代码的一部分:

  private: System::Void backgroundWorker1_DoWork(System::Object^  sender, System::ComponentModel::DoWorkEventArgs^  e) {
    BackgroundWorker^ worker = dynamic_cast<BackgroundWorker^>(sender);
    capture1.open(1);
    while (camStatus1){
        if (camBusy1) continue;
        capture1.read(frameA1);
        if (frameA1.empty()) continue;
        cv::cvtColor(frameA1, grayImageA1, CV_BGR2GRAY);
        worker->ReportProgress(1);
    }
}
private: System::Void backgroundWorker1_ProgressChanged(System::Object^  sender, System::ComponentModel::ProgressChangedEventArgs^  e) {
    if (!camBusy1){
        camBusy1 = 1;
        System::Drawing::Graphics^ graphics = imageBox1->CreateGraphics();
        System::IntPtr ptr(frameA1.ptr());
        System::Drawing::Bitmap^ b = gcnew System::Drawing::Bitmap(frameA1.cols, frameA1.rows, frameA1.step, System::Drawing::Imaging::PixelFormat::Format24bppRgb, ptr);
        System::Drawing::RectangleF rect(0, 0, imageBox1->Width, imageBox1->Height);
        graphics->DrawImage(b, rect);
        if (debugA){
            System::Drawing::Graphics^ graphics = imageBox3->CreateGraphics();
            System::IntPtr ptr(grayImageA1.ptr());
            System::Drawing::Bitmap^ b = gcnew System::Drawing::Bitmap(grayImageA1.cols, grayImageA1.rows, grayImageA1.step, System::Drawing::Imaging::PixelFormat::Format24bppRgb, ptr);
            System::Drawing::RectangleF rect(0, 0, imageBox3->Width, imageBox3->Height);
            graphics->DrawImage(b, rect);
        }
        camBusy1 = 0;
    }
}

知道为什么它会这样工作吗?我希望你能帮助我解决这个理论上简单的问题:)

我敢打赌,你的cvtColor()调用工作正常(尝试imwrite()输出,然后看看你自己),但是:

您正在尝试使用 24 位像素标志对 8 位图像进行 bling 处理:

System::Drawing::Bitmap^ b = gcnew System::Drawing::Bitmap(grayImageA1.cols, grayImageA1.rows, grayImageA1.step, System::Drawing::Imaging::PixelFormat::Format24bppRgb, ptr);

如果要保留像素标志,则必须再次转换为3通道:

Mat grayImage24;
cv::cvtColor(grayImageA1, grayImage24, CV_GRAY2BGR);
System::Drawing::Bitmap^ b = gcnew System::Drawing::Bitmap(grayImage24.cols, grayImage24.rows, grayImage24.step, System::Drawing::Imaging::PixelFormat::Format24bppRgb, ptr);

(现在不能尝试,但是IIRC,没有办法用Winforms对8位图像进行bled)