exposure.cpp

This example can be found in examples\cpp\exposure\exposure.cpp. When the PST SDK has been installed through the PST Software Suite installer the examples can be found in the Development folder.

This example shows how to adjust exposure settings using the PST SDK. It shows how to change exposure settings based on frame rate and the available exposure range for a certain PST Tracker at a certain frame rate.

When compiling and running this example, please make sure that the required dependencies can be found by the executable (e.g. by copying the Redist directory into the build directory. When the PST SDK has been installed through the PST Software Suite installer the Redist folder can be found in the Development folder.). On Windows, the Visual Studio project files are configured to use a relative path to the Redist directory as the working directory. If the examples have been copied, please ensure the working directory is still valid.

 
#ifdef WIN32
#include <windows.h>
#else
#include <csignal>
#endif
 
/*
 * Define handler functions required to ensure a clean shutdown of the PST Tracker when the
 * application is terminated.
 */
 
static void Exithandler(int sig);
 
#ifdef WIN32
BOOL WINAPI ConsoleHandler(DWORD CEvent)
{
    Exithandler(CEvent);
    return TRUE;
}
#endif
 
/* End of handler functions */
 
#include <iostream>
#include <thread>
#include <chrono>
#include <atomic>
 
#include "pstsdk_cpp.h"
#include "TrackerExceptions.h"
#include "PstStringIoStream.h"
 
/* Control variable for main loop */
static std::atomic<bool> running(true);
 
/* Number of data points to grab before application termination */
static const uint32_t numberOfSamplesToGrab = 1000;
 
/*
 * Implementation of the PSTech::pstsdk::Listener class to receive tracking data.
 * The OnTrackerData() callback function receives the data as soon as it becomes
 * available.
 */
class MyListener : public PSTech::pstsdk::Listener
{
    virtual void OnTrackerData(const PSTech::pstsdk::TrackerData& td) override
    {
        static uint32_t samplesGrabbed = 0;
        if (samplesGrabbed++ >= numberOfSamplesToGrab)
            running = false;
 
        // Do something with the received data.
    }
 
public:
    virtual ~MyListener() override
    {
        // Unregistering listener before destruction to prevent unwanted behavior
        PSTech::pstsdk::Tracker::RemoveTrackerListener(this);
    }
} listener;
 
/*
 * Implement the exit handler to shut-down the PST Tracker connection on application termination.
 */
static void Exithandler(int sig)
{
    PSTech::pstsdk::Tracker::Shutdown();
    running = false;
}
 
int main(int argc, char *argv[])
{
    // Register the exit handler with the application
#ifdef WIN32
    SetConsoleCtrlHandler((PHANDLER_ROUTINE)ConsoleHandler, TRUE);
#else
    signal(SIGTERM, Exithandler);
    signal(SIGKILL, Exithandler);
    signal(SIGQUIT, Exithandler);
    signal(SIGINT, Exithandler);
#endif
 
    // Implement error handling of PSTech::TrackerException exceptions to prevent
    // improper PST Tracker shutdown on errors.
    try
    {
        // Create an instance of the Tracker object using the default configuration path and file names.
#ifdef WIN32
        PSTech::pstsdk::Tracker pst;
#else
        // On Linux, specify the type of grabber that needs to be used as the last parameter:
        // "basler_ace" for PST HD or "basler_dart" for PST Pico
        PSTech::pstsdk::Tracker pst("","config.cfg","models.db",argv[1]);
#endif
        // Print version number of the tracker server being used.
        std::cout << "Running PST Server version " << pst.GetVersionInfo() << "\n";
 
        // Register the listener object to the tracker server.
        PSTech::pstsdk::Tracker::AddTrackerListener(&listener);
 
        // Start the tracker server.
        pst.Start();
 
        // Perform a system check to see if the tracker server is running OK and print the result.
        std::cout << "System check: " << (int)pst.Systemcheck() << "\n\n";
        std::cout << "***************************\n\n";
 
        // Set the frame rate to 30 Hz.
        pst.SetFramerate(30);
 
        // Print the new frame rate to see if it was set correctly. Note that for PST HD and Pico
        // trackers the frame rate actually being set can differ from the value provided to SetFramerate().
        std::cout << "Frame rate set to " << pst.GetFramerate() << " Hz\n";
 
        // Query available exposure range for the current frame rate and try setting the maximum exposure value
        double min, max;
        pst.GetExposureRange(min, max);
        std::cout << "Exposure range: " << min << " s - " << max << " s\n";
        std::cout << "Set exposure to " << max << "\n";
        pst.SetExposure(max);
        std::cout << "Check new exposure: " << pst.GetExposure() << " s\n\n";
        std::cout << "***************************\n\n";
 
        // Increase frame rate and check exposure value. For PST HD and PST Pico trackers, maximum exposure
        // depends on frame rate. Exposure will be automatically decreased when necessary.
        std::cout << "Set frame rate to 60 Hz\n";
        pst.SetFramerate(60);
        std::cout << "Frame rate set to " << pst.GetFramerate() << " Hz\n";
        std::cout << "Check exposure: " << pst.GetExposure() << " s\n";
 
        // Check new exposure range
        pst.GetExposureRange(min, max);
        std::cout << "New exposure range " << min << " s - " << max << " s\n\n";
        std::cout << "***************************\n\n";
 
        // Set exposure half-way
        double exposureHalf = min + (max - min) / 2.0;
        std::cout << "Set exposure half way: " << exposureHalf << " s\n";
        pst.SetExposure(exposureHalf);
        std::cout << "New exposure: " << pst.GetExposure() << " s\n\n";
        std::cout << "***************************\n\n";
 
        // Main loop, wait for auto-termination.
        while (running)
        {
            std::this_thread::sleep_for(std::chrono::milliseconds(100));
        }
    }
    catch (PSTech::TrackerException &e)
    {
        // Catch PSTech::TrackerException exceptions and print error messages.
        std::cout << e.full_description() << "\n";
    }
 
    // Make sure that the connection to the PST Tracker is shut down properly.
    PSTech::pstsdk::Tracker::Shutdown();
 
    // Pause command line to see results.
    std::cout << "Press enter to continue...\n";
    std::cin.get();
 
    return 0;
}