OpenCL 无法通过 OpenCV 检测到我的 nVidia GPU

Question

我有两个 GPU：Intel HD 和 nVidia Quadro。使用 GPU Caps Viewer，我可以在 OpenCL 选项卡中检测到我的两个 GPU。然而，通过执行这段代码，我只得到了英特尔的：

cv::ocl::setUseOpenCL(true);
if (!cv::ocl::haveOpenCL()) {
    std::cout << "OpenCL is not available..." << std::endl;
}
cv::ocl::Context context;
if (!context.create(cv::ocl::Device::TYPE_ALL)) {
    std::cout << "Failed creating the context..." << std::endl;
}
std::cout << context.ndevices() << " GPU devices are detected." << std::endl; 
for (int i = 0; i < context.ndevices(); i++) {
    cv::ocl::Device device = context.device(i);
    std::cout << "name:              " << device.name() << std::endl;
    std::cout << "available:         " << device.available() << std::endl;
    std::cout << "imageSupport:      " << device.imageSupport() << std::endl;
    std::cout << "OpenCL_C_Version:  " << device.OpenCL_C_Version() << std::endl;
    std::cout << std::endl;
}

结果：

1 GPU devices are detected.
name:              Intel(R) HD Graphics P530
available:         1
imageSupport:      1
OpenCL_C_Version:  OpenCL C 2.0

信息：

Windows 10
OpenCV 3.1
Visual studio 2013
nVidia Quadro M4000M

备注：

我可以使用 OpenCV Cuda 接口直接调用我的 nVidia GPU。
我刚刚从 nVidia 网站安装了最新的驱动程序。

Answer 1

我的解决方案是添加这个环境变量：

OPENCV_OPENCL_DEVICE=NVIDIA:GPU:

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