diff options
| author | Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> | 2021-11-04 14:22:37 +0100 |
|---|---|---|
| committer | Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> | 2021-11-15 11:00:05 +0100 |
| commit | 3d81620b20e853650d2baadab1b7b8bdc82c94d5 (patch) | |
| tree | 45e021d0e727ee3090afed6bf78888ad25cc0ab4 /src/ipa | |
| parent | 4fdf1e4f5e9dce03f9506999f610eb6b1277e1b7 (diff) | |
ipa: ipu3: agc: Refactor ev gain calculation and testing
When we compute the new gain, we use the iqMean_ and estimate an
exposure value gain to apply. Return early when the gain is less than
1%.
Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Diffstat (limited to 'src/ipa')
| -rw-r--r-- | src/ipa/ipu3/algorithms/agc.cpp | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/src/ipa/ipu3/algorithms/agc.cpp b/src/ipa/ipu3/algorithms/agc.cpp index 74bce7bb..61ca8b3f 100644 --- a/src/ipa/ipu3/algorithms/agc.cpp +++ b/src/ipa/ipu3/algorithms/agc.cpp @@ -188,14 +188,6 @@ void Agc::filterExposure() */ void Agc::computeExposure(IPAFrameContext &frameContext) { - - /* Are we correctly exposed ? */ - if (std::abs(iqMean_ - kEvGainTarget * knumHistogramBins) <= 1) { - LOG(IPU3Agc, Debug) << "We are well exposed (iqMean = " - << iqMean_ << ")"; - return; - } - /* Get the effective exposure and gain applied on the sensor. */ uint32_t exposure = frameContext.sensor.exposure; double analogueGain = frameContext.sensor.gain; @@ -203,6 +195,12 @@ void Agc::computeExposure(IPAFrameContext &frameContext) /* Estimate the gain needed to have the proportion wanted */ double evGain = kEvGainTarget * knumHistogramBins / iqMean_; + if (std::abs(evGain - 1.0) < 0.01) { + LOG(IPU3Agc, Debug) << "We are well exposed (iqMean = " + << iqMean_ << ")"; + return; + } + /* extracted from Rpi::Agc::computeTargetExposure */ /* Calculate the shutter time in seconds */ utils::Duration currentShutter = exposure * lineDuration_; |