def __init__(self):
"""
Initialize the input and reset the input description if necessary.
Throw an error if this input is not available
"""
from qcam import QCam, QCamUtil
# save our working directory
cwd = os.getcwd()
# attempt to load the driver
QCam.LoadDriver()
# load our working directory
os.chdir(cwd)
# try releasing it
QCam.ReleaseDriver()
def get_input(self, parent):
"""
Display an input selection dialog if necessary and return
an OpenedInput
Any exceptions raised would cause an error box to pop up
"""
from qcam import QCam, QCamUtil
cwd = os.getcwd()
QCam.ReleaseDriver()
QCam.LoadDriver()
os.chdir(cwd)
# list the cameras the camera
cameraList = QCam.ListCameras()
if 0 >= len(cameraList):
raise Error('No cameras found.')
# open the camera
camera = QCam.OpenCamera(cameraList[0])
# set a default exposure, format, etc.
camera.settings.exposure = 25000
camera.settings.imageFormat = 'mono16'
camera.settings.Flush()
# set up camera queue
queue = QCamUtil.CameraQueue(camera)
# create a settings widget
widget = CameraSettings(camera, queue, parent.settings)
widget.loadSettings()
widget.updateFromCamera()
# return an opened input
return inputs.OpenedInput(queue, widget)
import Image
import struct
import numpy
if len(sys.argv) != 4:
print >> sys.stderr, "Usage: %s <exposure in microseconds> <output file name format> <number of frames>" % sys.argv[
0]
sys.exit(-1)
exposure_ms = int(sys.argv[1])
output_file_format = sys.argv[2]
num_frames = int(sys.argv[3])
# set up the camera
QCam.ReleaseDriver()
QCam.LoadDriver()
# open the camera
cam = QCam.OpenCamera(QCam.ListCameras()[0])
# set the exposure
print >> sys.stderr, "Setting exposure to %d microsecond(s)" % exposure_ms
cam.settings.exposure = exposure_ms
cam.settings.imageFormat = 'mono16'
cam.settings.Flush()
# unused code
# create a camera queue
queue = QCamUtil.CameraQueue(cam)
widget = CameraSettings(camera, queue, parent.settings)
widget.loadSettings()
widget.updateFromCamera()
# return an opened input
return inputs.OpenedInput(queue, widget)
def close_input(self, opened_input):
"""
Close an input that was previously opened by get_input
"""
from qcam import QCam, QCamUtil
try:
# stop streaming
opened_input.queue().stop()
except Exception, e:
print >> sys.stderr, "Ignored exception:"
traceback.print_exc()
try:
# close the camera
opened_input.queue().camera.CloseCamera()
except Exception, e:
print >> sys.stderr, "Ignored exception:"
traceback.print_exc()
try:
# unload our drivers
QCam.ReleaseDriver()
except Exception, e:
print >> sys.stderr, "Ignored exception:"
traceback.print_exc()