def _resolution_changed(self, value):
width, height = value
cv.SetCaptureProperty(self._capture, FRAME_WIDTH, width)
cv.SetCaptureProperty(self._capture, FRAME_HEIGHT, height)
if cv.GetCaptureProperty(self._capture, FRAME_WIDTH) != width:
raise CameraError('Width {0} not supported'.format(width),
self.camera_number)
if cv.GetCaptureProperty(self._capture, FRAME_HEIGHT) != height:
raise CameraError('Height {0} not supported'.format(height),
self.camera_number)
def _resolution_changed(self, value):
width, height = value
self._capture.set(FRAME_WIDTH, width)
self._capture.set(FRAME_HEIGHT, height)
if self._capture.get(FRAME_WIDTH) != width:
raise CameraError('Width {0} not supported'.format(width),
self.camera_number)
if self._capture.get(FRAME_HEIGHT) != height:
raise CameraError('Height {0} not supported'.format(height),
self.camera_number)
def open(self):
self._capture = cv.CaptureFromCAM(self.camera_number)
# doesn't raise an exception on error, so we test it explicitly
iplimage = cv.QueryFrame(self._capture)
if iplimage is None:
raise CameraError('Could not query image', self.camera_number)
def open(self):
self._cam = VideoCapture.Device(self.camera_number)
# Capture a throwaway frame in order to get the resolution
# and bytes per pixel
buffer, width, height = self._cam.getBuffer()
self.resolution = (width, height)
itemsize = len(buffer) / (width * height * 3)
# Pick an appropriate dtype and cache it
if itemsize == 1:
self._dtype = N.uint8
elif itemsize == 2:
self._dtype = N.uint16
elif itemsize == 4:
self._dtype = N.uint32
else:
raise CameraError(
"Unsupported bytes per pixel '{}'".format(itemsize),
self.camera_number)
def query_frame(self):
iplimage = cv.QueryFrame(self._capture)
if iplimage is None:
raise CameraError('Could not query image', self.camera_number)
self.frame = ipl2array(iplimage)
def reset(self):
self._cam.ResetState()
# if error status persists, raise an exception
if self._cam.ImagingStatus < 0:
raise CameraError('Error not cleared by reset', self.camera_number)
def query_frame(self):
success, frame = self._capture.read()
if not success:
raise CameraError('Could not query image', self.camera_number)
self.frame = frame
def open(self):
self._capture = cv2.VideoCapture(self.camera_number)
# doesn't raise an exception on error, so we test it explicitly
if not self._capture.isOpened():
raise CameraError('Could not open camera', self.camera_number)