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ipa: ipu3: awb: Add support for color temperature

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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>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
This commit is contained in:
Jean-Michel Hautbois 2021-11-05 18:56:57 +01:00
parent 891ec3f872
commit a0734f72d4
3 changed files with 6 additions and 0 deletions
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1
src/ipa/ipu3/algorithms/awb.cpp
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@ -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)

3
src/ipa/ipu3/ipa_context.cpp
View file

@ -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
*/
/**

2
src/ipa/ipu3/ipa_context.h
View file

@ -45,6 +45,8 @@ struct IPAFrameContext {
double green;
double blue;
} gains;
double temperatureK;
} awb;
struct {