please update auto lighting algorithm 1- make exp...

I’ll update the lighting logic in the uploaded C++ files: first I’ll trace the current checkbox/auto-light flow, then change exposure selection to depend on CAM position and make LED adjustments small, stable, and no-op while already in range.

I found the source of the instability: the current standalone auto-light starts at LED 255 and sweeps down in large jumps, and it also switches between exposure -8/-7. I’m replacing that with a fixed exposure derived from CAM position and one small LED step per measurement, starting from the current LED instead of resetting it.

The main behavior is now changed: exposure is no longer used as a brightness-control knob; it follows CAM position, while LED moves only ±5 after two consecutive out-of-range samples. When all metrics are in range, the code holds both settings unchanged.

I’ve kept the existing image-quality ranges, so the acceptance criteria did not change—only the control behavior did. I’m doing a final source-level check now and packaging the updated pair plus a patch, without changing the autofocus implementation itself.

Updated the auto-lighting controller in mainwindow.cpp/.h. The original controller was built around an LED sweep and exposure changes (mainwindow.cpp), with its state stored in the standalone checkBox_2 lighting section. (mainwindow.h)

Changes:

• CAM < 9 mm → exposure -9
• CAM 9–100 mm → exposure -8
• CAM > 100 mm → exposure -7
• LED now starts from its current value, not 255.
• LED changes only ±5 at a time.
• It measures again after each small LED change.
• Requires 2 consecutive bad readings before moving LED, reducing flicker/jitter.
• If lighting is inside your existing acceptable range, nothing changes.
• Exposure is controlled only by CAM position; brightness correction does not switch exposure anymore.
• Redundant hardware writes are avoided.

I treated the undefined 9–10 mm gap as exposure -8, so the boundary is continuous.

Files: Updated mainwindow.cpp
Updated mainwindow.h
Patch only
Complete updated source package

autofocus.cpp/.h are included in the ZIP unchanged; this update targets the standalone continuous auto-lighting controller.

I’ll tune the controller around mean only as the primary decision: 80–200 will be a hard “hold” zone, and outside that zone the LED jump will scale from 1 to 100 based on how far the mean is from the nearest limit. I’ll also make sure the controller keeps evaluating frames during motor movement instead of waiting for motion to finish.

A useful stability change is to measure first, then decide. I’m making startup preserve the current LED/exposure; if the first mean is already 80–200, the controller will not touch either setting. Only when mean leaves that band will it enforce the CAM exposure rule and then make a proportional LED correction.

The adaptive response is now proportional instead of “walk down slowly.” For example, a mean just outside the band gets a tiny correction, while very dark/bright frames can jump tens of LED counts in one move, up to 100; large errors correct immediately, while only near-edge errors require a second confirming frame.

The updated controller is packaged. I also checked for remnants of the old fixed-step/sweep logic; those symbols are gone from the current mainwindow.cpp/.h, so the standalone auto-light path now uses only the adaptive mean-based correction.

Updated it. The previous controller could keep changing because it required all brightness/percentile/contrast metrics to be in range, not just mean, and it used a stepped LED sweep. (mainwindow.cpp) The old timing was also 250 ms monitoring / 80 ms settling. (mainwindow.h)

The new behavior is:

• Mean 80–200 = HOLD everything. No LED change and no exposure change.
• It now measures first when auto-light is enabled. It does not jump LED to 255 or unnecessarily change exposure.
• If mean is outside 80–200, it first applies your CAM exposure rule:
  • CAM < 9 mm → -9
  • CAM 9–100 mm → -8
  • CAM > 100 mm → -7
• After exposure settles, LED is corrected from the mean error only.
• LED adjustment is now adaptive from 1–100 counts, instead of slowly walking:
  • mean 79 → about 2
  • mean 70 → 13
  • mean 40 → 51
  • mean 0 → 100
  • mean 205 → 10
  • mean 230 → 55
  • mean 255 → 100
• Large errors are corrected immediately.
• Only very small errors within 6 mean-points of the 80/200 boundary require 2 matching samples, which helps prevent oscillation.
• Monitoring is faster: 100 ms.
• Hardware settle delay is 50 ms.
• Auto-light continues analyzing preview frames while motors are moving; there is no motor-idle condition stopping it.
• P05/P50/P95/contrast/dark/clipping are still logged for diagnostics, but they cannot cause LED movement when mean is already 80–200.

Files:

Updated mainwindow.cpp

Updated mainwindow.h

Auto-light v2 patch

Complete updated source package

autofocus.cpp/.h are included unchanged in the package. I source-checked the changes and removed the previous fixed LED-step/sweep logic; I couldn't perform a full Qt project build because the complete project/build files weren't provided.