diff options
| -rw-r--r-- | src/ipa/rkisp1/algorithms/awb.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/ipa/rkisp1/algorithms/awb.cpp b/src/ipa/rkisp1/algorithms/awb.cpp index 139c8239..59664d09 100644 --- a/src/ipa/rkisp1/algorithms/awb.cpp +++ b/src/ipa/rkisp1/algorithms/awb.cpp @@ -242,6 +242,16 @@ void Awb::process(IPAContext &context, redMean = 1.1636 * yMean - 0.0623 * cbMean + 1.6008 * crMean; greenMean = 1.1636 * yMean - 0.4045 * cbMean - 0.7949 * crMean; blueMean = 1.1636 * yMean + 1.9912 * cbMean - 0.0250 * crMean; + + /* + * Due to hardware rounding errors in the YCbCr means, the + * calculated RGB means may be negative. This would lead to + * negative gains, messing up calculation. Prevent this by + * clamping the means to positive values. + */ + redMean = std::max(redMean, 0.0); + greenMean = std::max(greenMean, 0.0); + blueMean = std::max(blueMean, 0.0); } /* |