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Added helpful errors if the stream has stopped

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This commit is contained in:
Richard Bowman 2020-04-23 11:15:10 +01:00
parent 161c17812e
commit 5a4aae8ed1
1 changed files with 10 additions and 3 deletions
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13
openflexure_microscope/api/default_extensions/autofocus.py
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@ -92,15 +92,20 @@ class JPEGSharpnessMonitor:
def move_data(self, istart, istop=None): def move_data(self, istart, istop=None):
"Extract sharpness as a function of (interpolated) z" "Extract sharpness as a function of (interpolated) z"
global np, logging
if istop is None: if istop is None:
istop = istart + 2 istop = istart + 2
jpeg_times = np.array(self.jpeg_times) jpeg_times = np.array(self.jpeg_times)
jpeg_sizes = np.array(self.jpeg_sizes) jpeg_sizes = np.array(self.jpeg_sizes)
stage_times = np.array(self.stage_times)[istart:istop] stage_times = np.array(self.stage_times)[istart:istop]
stage_zs = np.array(self.stage_positions)[istart:istop, 2] stage_zs = np.array(self.stage_positions)[istart:istop, 2]
start = np.argmax(jpeg_times > stage_times[0]) try:
stop = np.argmax(jpeg_times > stage_times[1]) start = np.argmax(jpeg_times > stage_times[0])
stop = np.argmax(jpeg_times > stage_times[1])
except ValueError as e:
if np.sum(jpeg_times > stage_times[0]) == 0:
raise ValueError("No images were captured during the move of the stage. Perhaps the camera is not streaming images?")
else:
raise e
if stop < 1: if stop < 1:
stop = len(jpeg_times) stop = len(jpeg_times)
logging.debug("changing stop to {}".format(stop)) logging.debug("changing stop to {}".format(stop))
@ -111,6 +116,8 @@ class JPEGSharpnessMonitor:
def sharpest_z_on_move(self, index): def sharpest_z_on_move(self, index):
"""Return the z position of the sharpest image on a given move""" """Return the z position of the sharpest image on a given move"""
jt, jz, js = self.move_data(index) jt, jz, js = self.move_data(index)
if len(js) == 0:
raise ValueError("No images were captured during the move of the stage. Perhaps the camera is not streaming images?")
return jz[np.argmax(js)] return jz[np.argmax(js)]
def data_dict(self): def data_dict(self):