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utils: raspberrypi: ctt: Fix NaNs in chromatic aberration tables

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NaNs can appear if no black dots can be found and analysed in a
particular region of the calibration image. There needs to be at least
one such dot in every 8x8 cell covering the image.

This is now detected, and an error message issued. No CAC tables are
generated, so CAC is disabled.

Bug: https://github.com/raspberrypi/libcamera/issues/254
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
David Plowman 2025-04-28 11:36:04 +01:00 • committed by Kieran Bingham
parent 36ba0e5515
commit 17e41b2a3a
2 changed files with 33 additions and 8 deletions
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9
utils/raspberrypi/ctt/ctt.py
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@ -198,9 +198,12 @@ class Camera:
"""
Write output to json
"""
self.json['rpi.cac']['cac'] = cacs
self.log += '\nCAC calibration written to json file'
print('Finished CAC calibration')
if cacs:
self.json['rpi.cac']['cac'] = cacs
self.log += '\nCAC calibration written to json file'
print('Finished CAC calibration')
else:
self.log += "\nCAC calibration failed"
"""