PawletOS/external_libcamera
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ipa: mali-c55: Reduce AWB calculations to float precision

Browse Source 
The AWB calculations are determined using double precision, and then
will be soon stored in a quantized float.

Use float types for the intermediate types after the sums have been
converted to an average to remove static cast assignments.

Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Kieran Bingham
2026-02-19 15:05:12 +00:00
parent 4116467710
commit 6b5ecd96ff
1 changed files with 6 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
src/ipa/mali-c55/algorithms/awb.cpp
View File

@@ -159,7 +159,7 @@ void Awb::process(IPAContext &context, const uint32_t frame,
* Sometimes the first frame's statistics have no valid pixels, in which
* case we'll just assume a grey world until they say otherwise.
*/
double rgAvg, bgAvg;
float rgAvg, bgAvg;
if (!counted_zones) {
rgAvg = 1.0;
bgAvg = 1.0;
@@ -174,15 +174,15 @@ void Awb::process(IPAContext &context, const uint32_t frame,
* figure by the gains that were applied when the statistics for this
* frame were generated.
*/
double rRatio = rgAvg / frameContext.awb.rGain;
double bRatio = bgAvg / frameContext.awb.bGain;
float rRatio = rgAvg / frameContext.awb.rGain;
float bRatio = bgAvg / frameContext.awb.bGain;
/*
* And then we can simply invert the ratio to find the gain we should
* apply.
*/
double rGain = 1 / rRatio;
double bGain = 1 / bRatio;
float rGain = 1 / rRatio;
float bGain = 1 / bRatio;
/*
* Running at full speed, this algorithm results in oscillations in the
@@ -190,7 +190,7 @@ void Awb::process(IPAContext &context, const uint32_t frame,
* changes in gain, unless we're in the startup phase in which case we
* want to fix the miscolouring as quickly as possible.
*/
double speed = frame < kNumStartupFrames ? 1.0 : 0.2;
float speed = frame < kNumStartupFrames ? 1.0f : 0.2f;
rGain = speed * rGain + context.activeState.awb.rGain * (1.0 - speed);
bGain = speed * bGain + context.activeState.awb.bGain * (1.0 - speed);