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exposure.py

This example can be found in `examples\python\exposure.py`. 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.

"""Exposure example of the PST SDK
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.
Copyright PS-Tech B.V. All Rights Reserved.
"""
import context
import time
import sys
import pstech.pstsdk.tracker as pst
import pstech.pstsdk.errors as psterrors
# Control variable for main loop
running = True
# Number of data points to grab before application termination
max_samples = 100
# Global number of samples
samples = 0
"""Implementation of the pst.Listener class to receive tracking data."""
class MyListener(pst.Listener):
"""Implementation of a tracker data callback function
Implementation of a tracker data callback function. The on_tracker_data
function receives the data as soon as it becomes available.
Args:
tracker_data: Object containing tracking information retrieved from tracker
status_message: Status message reported by the tracker.
See Also:
pstech.pstdk.trackerdata.TrackerData
pstech.pstsdk.errors.EStatusMessage
"""
def on_tracker_data(self, tracker_data, status_message):
global samples
global running
if samples >= max_samples:
running = False
samples += 1
# Do something here with the received data
"""Helper function to register the exit handler with the application"""
def register_exit_handler():
if sys.platform.startswith("linux"):
import signal
signal.signal(signal.SIGTERM, exit_handler)
signal.signal(signal.SIGHUP, exit_handler)
signal.signal(signal.SIGQUIT, exit_handler)
signal.signal(signal.SIGINT, exit_handler)
elif sys.platform.startswith("win"):
import win32api
win32api.SetConsoleCtrlHandler(exit_handler, True)
"""Implement the exit handler to shut-down the PST Tracker connection on application termination."""
def exit_handler(*args):
global running
pst.Tracker.shutdown()
running = False
return True
def main():
if(len(sys.argv) < 2):
print("\nConfiguration Error: A camera configuration file needs to be specified. This file can be found in the Redist folder of your installation. "
"See the documentation of the Python bindings for more information.")
exit(0)
# Register exit_handler for proper shutdown
register_exit_handler()
try:
# Use Context Manager to prevent improper Tracker shutdown on errors.
# Create an instance of the Tracker object using the default configuration path and file names.
with pst.Tracker("", "","", sys.argv[1]) as tracker:
# Print version number of the tracker server being used.
print("Running PST Server version " + tracker.get_version_info())
# Create listener with callback functions for data and/or mode updates.
listener = MyListener()
# Register the listener object to the tracker server.
tracker.add_tracker_listener(listener)
# Start the tracker server.
tracker.start()
# Perform a system check to see if the tracker server is running OK and print the result.
print("System check: " + str(tracker.system_check()))
print("***************************\n")
# Set the frame rate to 30 Hz.
tracker.set_framerate(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().
print("Frame rate set to: " + str(tracker.get_framerate()) + " Hz\n")
# Query available exposure range for the current frame rate and try setting the maximum exposure value.
min, max = tracker.get_exposure_range()
print("Exposure range: " + str(min) + " s - " + str(max) + " s")
print("Set Exposure to " + str(max))
tracker.set_exposure(max)
print("Check new exposure: " + str(tracker.get_exposure()) + " s")
print("***************************\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.
print("Set frame rate to 60 Hz")
tracker.set_framerate(60)
print("Frame rate set to: " + str(tracker.get_framerate()) + " Hz\n")
print("Check exposure: " + str(tracker.get_exposure()) + " s")
# Check new exposure range
min, max = tracker.get_exposure_range()
print("New exposure range: " + str(min) + " s - " + str(max) + " s")
print("***************************\n")
# Set exposure half-way
exposure_half = min + (max - min) / 2.0
print("Set exposure half way: " + str(exposure_half) + " s")
tracker.set_exposure(exposure_half)
print("Check new exposure: " + str(tracker.get_exposure()) + " s")
print("***************************\n")
while running:
time.sleep(0.1)
except psterrors.TrackerError as err:
# Catch TrackerError and print error message
print(err.message)
if __name__ == "__main__":
main()
pstech.pstsdk.errors
Module containing all error related classes and functions.
Definition errors.py:1
pstech.pstsdk.tracker
Module containing all tracker related classes and functions.
Definition tracker.py:1