ipa: ipu3: agc: Compute the gain for each frame

Now that we have the real exposure applied at each frame, remove the
early return based on a frame counter and compute the gain for each
frame.

Introduce a number of startup frames during which the filter speed is
1.0, meaning we apply instantly the exposure value calculated and not a
slower filtered one. This is used to have a faster convergence, and
those frames may be dropped in a future development to hide the
convergance process from the viewer.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/src/ipa/ipu3/algorithms/agc.h b/src/ipa/ipu3/algorithms/agc.h
index f0db25ee..99c60d46 100644
--- a/src/ipa/ipu3/algorithms/agc.h
+++ b/src/ipa/ipu3/algorithms/agc.h
@@ -37,7 +37,6 @@ private:
 	void computeExposure(IPAFrameContext &frameContext);
 
 	uint64_t frameCount_;
-	uint64_t lastFrame_;
 
 	double iqMean_;