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I think it's not possible in current implementation because nd= 1;

in function Impl(int dtype0) called by ocl::createContext

I think a post must exist about this

I think it's not possible in current implementation because nd= 1;

in function Impl(int dtype0) called by ocl::createContext

and opencv detect first one

I think a post must exist about this

I think it's not possible in current implementation because nd= 1;

in function Impl(int dtype0) called by ocl::createContext

and opencv detect first one

I think a post must exist about this

I think it's not possible in current implementation because nd= 1;

in function Impl(int dtype0) called by ocl::createContext

and opencv detect first one

I think a post must exist about this[Try with] to check device in your system (http://answers.opencv.org/question/59115/opencv-30-beta-and-opencl-setdevice/) :

std::vector<cv::ocl::PlatformInfo> platforms;
cv::ocl::getPlatfomsInfo(platforms);

//OpenCL Platforms
for (size_t i = 0; i < platforms.size(); i++)
{

//Access to Platform
const cv::ocl::PlatformInfo* platform = &platforms[i];

//Platform Name
std::cout << "Platform Name: " << platform->name().c_str() << "\n";

//Access Device within Platform
cv::ocl::Device current_device;
for (int j = 0; j < platform->deviceNumber(); j++)
{
    //Access Device
    platform->getDevice(current_device, j);

    //Device Type
    int deviceType = current_device.type();
}

}

It's difficult to test for me because I have got only one context but may be you con read doc and try to set your own context

I think it's not possible in current implementation because nd= 1;

in function Impl(int dtype0) called by ocl::createContext

and opencv detect first one

[Try with] to check device in your system (http://answers.opencv.org/question/59115/opencv-30-beta-and-opencl-setdevice/) :

std::vector<cv::ocl::PlatformInfo> platforms;
cv::ocl::getPlatfomsInfo(platforms);

//OpenCL Platforms
for (size_t i = 0; i < platforms.size(); i++)
{

//Access to Platform
const cv::ocl::PlatformInfo* platform = &platforms[i];

//Platform Name
std::cout << "Platform Name: " << platform->name().c_str() << "\n";

//Access Device within Platform
cv::ocl::Device current_device;
for (int j = 0; j < platform->deviceNumber(); j++)
{
    //Access Device
    platform->getDevice(current_device, j);

    //Device Type
    int deviceType = current_device.type();
}
}

It's difficult to test for me because I have got only one context but may be you con read doc and try to set your own context