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Getting ready for new type of camera listing.

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This commit is contained in:
Tadas Baltrusaitis 2018-01-25 08:22:45 +00:00
parent 522eb86316
commit f9608aa758
1 changed files with 67 additions and 0 deletions
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67
lib/local/CppInerop/SequenceReader.h
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@ -211,4 +211,71 @@ namespace UtilitiesOF {
} }
}; };
// A utility for listing the currently connected cameras together with their ID, subset of supported resolutions and a thumbnail
static List<System::Tuple<int, List<System::Tuple<int, int>^>^, OpenCVWrappers::RawImage^>^>^ GetCameras()
{
auto managed_camera_list = gcnew List<System::Tuple<int, List<System::Tuple<int, int>^>^, OpenCVWrappers::RawImage^>^>();
// Go through camera id's untill no new cameras are found
int num_cameras = 0;
while (true)
{
cv::VideoCapture cap(num_cameras);
if (cap.isOpened())
num_cameras++;
else
break;
}
for (size_t i = 0; i < num_cameras; ++i)
{
//std::string name = cameras[i].name();
//System::String^ name_managed = gcnew System::String(name.c_str());
auto resolutions = gcnew List<System::Tuple<int, int>^>();
// A common set of resolutions for webcams
std::vector<std::pair<int, int>> common_resolutions;
common_resolutions.push_back(std::pair<int, int>(320, 240));
common_resolutions.push_back(std::pair<int, int>(640, 480));
common_resolutions.push_back(std::pair<int, int>(1280, 960));
// Grab some sample images and confirm the resolutions
cv::VideoCapture cap1(i);
cv::Mat sample_img;
OpenCVWrappers::RawImage^ sample_img_managed = gcnew OpenCVWrappers::RawImage();
// Go through resolutions if they have not been identified
for (auto beg = common_resolutions.begin(); beg != common_resolutions.end(); ++beg)
{
auto resolution = gcnew System::Tuple<int, int>(beg->first, beg->first);
cap1.set(CV_CAP_PROP_FRAME_WIDTH, resolution->Item1);
cap1.set(CV_CAP_PROP_FRAME_HEIGHT, resolution->Item2);
// Add only valid resolutions as API sometimes provides wrong ones
int set_width = cap1.get(CV_CAP_PROP_FRAME_WIDTH);
int set_height = cap1.get(CV_CAP_PROP_FRAME_HEIGHT);
// Read several frames, as the first one often is over-exposed
for (int k = 0; k < 2; ++k)
cap1.read(sample_img);
resolution = gcnew System::Tuple<int, int>(set_width, set_height);
if (!resolutions->Contains(resolution))
{
resolutions->Add(resolution);
}
}
sample_img.copyTo(sample_img_managed->Mat);
cap1.~VideoCapture();
managed_camera_list->Add(gcnew System::Tuple<int, List<System::Tuple<int, int>^>^, OpenCVWrappers::RawImage^>(i, resolutions, sample_img_managed));
}
return managed_camera_list;
}
} }