[libcamera-devel,v3,10/14] ipa: ipu3: awb: Add support for color temperature
diff mbox series

Message ID 20211111110605.105202-11-jeanmichel.hautbois@ideasonboard.com
State Superseded
Headers show
Series
  • IPA: IPU3: Introduce per-frame controls
Related show

Commit Message

Jean-Michel Hautbois Nov. 11, 2021, 11:06 a.m. UTC 
The AWB estimates the color temperature, but it is not used at all. It
can be useful for debug purpose at least, but also for lux estimation
later, to be able to know the temperature estimated for a given frame.

Add a new member to the IPAFrameContext::awb for this purpose, and
update the value in AWB.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 src/ipa/ipu3/algorithms/awb.cpp | 1 +
 src/ipa/ipu3/ipa_context.cpp    | 3 +++
 src/ipa/ipu3/ipa_context.h      | 2 ++
 3 files changed, 6 insertions(+)

Patch
diff mbox series 

diff --git a/src/ipa/ipu3/algorithms/awb.cpp b/src/ipa/ipu3/algorithms/awb.cpp
index a4114659..c7bcb20e 100644
--- a/src/ipa/ipu3/algorithms/awb.cpp
+++ b/src/ipa/ipu3/algorithms/awb.cpp
@@ -385,6 +385,7 @@  void Awb::process(IPAContext &context, const ipu3_uapi_stats_3a *stats)
 	context.frameContext.awb.gains.blue = asyncResults_.blueGain;
 	context.frameContext.awb.gains.green = asyncResults_.greenGain;
 	context.frameContext.awb.gains.red = asyncResults_.redGain;
+	context.frameContext.awb.temperatureK = asyncResults_.temperatureK;
 }
 
 constexpr uint16_t Awb::threshold(float value)
diff --git a/src/ipa/ipu3/ipa_context.cpp b/src/ipa/ipu3/ipa_context.cpp
index a7ff957d..99caf9ad 100644
--- a/src/ipa/ipu3/ipa_context.cpp
+++ b/src/ipa/ipu3/ipa_context.cpp
@@ -117,6 +117,9 @@  namespace libcamera::ipa::ipu3 {
  *
  * \var IPAFrameContext::awb.gains.blue
  * \brief White balance gain for B channel
+ *
+ * \var IPAFrameContext::awb.temperatureK
+ * \brief Estimated color temperature
  */
 
 /**
diff --git a/src/ipa/ipu3/ipa_context.h b/src/ipa/ipu3/ipa_context.h
index a5a19800..fd97e240 100644
--- a/src/ipa/ipu3/ipa_context.h
+++ b/src/ipa/ipu3/ipa_context.h
@@ -45,6 +45,8 @@  struct IPAFrameContext {
 			double green;
 			double blue;
 		} gains;
+
+		double temperatureK;
 	} awb;
 
 	struct {