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Flush more frames and use a request when doing exposure time

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This commit is contained in:
jaknapper 2026-03-13 10:48:22 +00:00
parent 4190899f17
commit a4aac53072
1 changed files with 11 additions and 3 deletions
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14
src/openflexure_microscope_server/things/camera/picamera_recalibrate_utils.py
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@ -253,9 +253,18 @@ def _test_exposure_settings(camera: Picamera2, percentile: float) -> _ExposureTe
percentile (which will be compared to the target), as well as percentile (which will be compared to the target), as well as
the camera's shutter and gain values. the camera's shutter and gain values.
""" """
camera.capture_array("raw") # controls might not be updated for the first frame? # Flush stale frames
for _ in range(4):
r = camera.capture_request()
r.release()
# A single request, to ensure metadata matches frame
request = camera.capture_request()
metadata = request.get_metadata()
image = request.make_array("raw")
request.release()
max_brightness = np.percentile( max_brightness = np.percentile(
_channels_from_bayer_array(camera.capture_array("raw")), _channels_from_bayer_array(image),
percentile, percentile,
) )
# The reported brightness can, theoretically, be negative or zero # The reported brightness can, theoretically, be negative or zero
@ -268,7 +277,6 @@ def _test_exposure_settings(camera: Picamera2, percentile: float) -> _ExposureTe
"camera's black level compensation has gone wrong." "camera's black level compensation has gone wrong."
) )
max_brightness = 1 max_brightness = 1
metadata = camera.capture_metadata()
result = _ExposureTest( result = _ExposureTest(
level=max_brightness, level=max_brightness,
exposure_time=int(metadata["ExposureTime"]), exposure_time=int(metadata["ExposureTime"]),