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Hi, yes I agree that the AeLocked metadata needs to be revised. Possibly it should also leap more quickly to its final target value once it's very close. There's always lots to think about! |
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Hi, I'm coming back to this discussion because there hasn't been much change in the AGC/AE algorithm. I do the following tests (full resolution, still configuration 2 buffers imx477.json )
You have to wait 7 frames to get a fixed exposure
Another 7 frames before the AGC/AE algorithm starts. Then It takes about ten frames to converge
The AGC/AE algorithm immediately finds an acceptable value !! |
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You're right. I've not had any time to do any work on it. As regards the long delay for settings to take effect, that's mostly down to libcamera. Control changes get stuck at the back of the request queue, and even once they get to the front there are still another 3 or frames or so of delay. We've long been wanting to change this, but now, libcamera is reviewing how its API works which should give us a route to improving this. But it will still be a while. Yes, the AeLocked indicator needs work. There's other stuff that needs doing first, but I will try to get round to it at some point. |
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To complete I did some tests for the HDR algorithm (on a PI5). The HDR algorithm is a special operating mode of the AGC/AE algorithm (and not an HDR at the sensor level). In the configuration file we define two AGC channels short and long. The first remark is that these channels are very little different in the imx477.json file provided, to obtain a real effect you have to change the parameters, I did it for example with base_ev respectively 0.5 and 1.5 for channels 1 and 2 As before start in fixed 1000 then AeEnable in HDR mode:
After the usual 7 frames the algorithm stabilizes immediately (but AeLocked still inconsistent and error on the channel why 3 is reported and not 2?). In unmerged mode we get alternately the short and long frames (on the main and raw streams) and in merge mode a merge frame (on the main stream only).
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I wonder about the convergence of the AGC/AEC algorithm.
Below is the sequence of queries in the following case:
Start with auto exposure 7328, then a fixed exposure of twice this value 14657 and return to Auto.
The AGC/AEC algorithm seems to take a long time to converge, more than 20 requests.
There seem to be two or three steps in the behavior
Can't rely on AeLocked to know when the algorithm has converged
Note: all this with the tuning file and all default parameters (I note that 10000 is a limit value in exposure_modes)
Returning to auto
AeLocked: False Exposure: 14657 Analog: 1.0 Digital: 1.001832365989685
AeLocked: False Exposure: 14657 Analog: 1.0 Digital: 1.001832365989685
AeLocked: True Exposure: 14657 Analog: 1.0 Digital: 1.001832365989685
AeLocked: False Exposure: 14657 Analog: 1.0 Digital: 1.001832365989685
AeLocked: False Exposure: 14657 Analog: 1.0 Digital: 1.001832365989685
AeLocked: False Exposure: 14657 Analog: 1.0 Digital: 1.001832365989685
AeLocked: False Exposure: 14657 Analog: 1.0 Digital: 1.001832365989685
AeLocked: False Exposure: 10000 Analog: 1.3350716829299927 Digital: 1.0002212524414062
AeLocked: False Exposure: 10000 Analog: 1.2278177738189697 Digital: 1.000914454460144
AeLocked: False Exposure: 10000 Analog: 1.1428571939468384 Digital: 1.0008269548416138
AeLocked: False Exposure: 10000 Analog: 1.0756303071975708 Digital: 1.0000661611557007
AeLocked: False Exposure: 10000 Analog: 1.020937204360962 Digital: 1.0002498626708984
AeLocked: True Exposure: 9742 Analog: 1.0 Digital: 1.0010063648223877
AeLocked: True Exposure: 9342 Analog: 1.0 Digital: 1.002004861831665
AeLocked: True Exposure: 9028 Analog: 1.0 Digital: 1.0002583265304565
AeLocked: True Exposure: 8400 Analog: 1.0 Digital: 1.0010716915130615
AeLocked: True Exposure: 8028 Analog: 1.0 Digital: 1.0014674663543701
AeLocked: True Exposure: 7800 Analog: 1.0 Digital: 1.0021942853927612
AeLocked: True Exposure: 7657 Analog: 1.0 Digital: 1.002753496170044
AeLocked: True Exposure: 7571 Analog: 1.0 Digital: 1.002395749092102
AeLocked: True Exposure: 7514 Analog: 1.0 Digital: 1.000394582748413
AeLocked: True Exposure: 7457 Analog: 1.0 Digital: 1.0008976459503174
AeLocked: True Exposure: 7400 Analog: 1.0 Digital: 1.0035778284072876
AeLocked: True Exposure: 7400 Analog: 1.0 Digital: 1.0001429319381714
AeLocked: True Exposure: 7371 Analog: 1.0 Digital: 1.0017125606536865
AeLocked: True Exposure: 7371 Analog: 1.0 Digital: 1.0002228021621704
AeLocked: True Exposure: 7342 Analog: 1.0 Digital: 1.003018856048584
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