diff options
| -rw-r--r-- | src/ipa/rkisp1/algorithms/awb.cpp | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/src/ipa/rkisp1/algorithms/awb.cpp b/src/ipa/rkisp1/algorithms/awb.cpp index 26d7b813..4bb4f5b8 100644 --- a/src/ipa/rkisp1/algorithms/awb.cpp +++ b/src/ipa/rkisp1/algorithms/awb.cpp @@ -210,13 +210,18 @@ void Awb::process(IPAContext &context, }); /* - * Convert from YCbCr to RGB. - * The hardware uses the following formulas: - * Y = 16 + 0.2500 R + 0.5000 G + 0.1094 B + * Convert from YCbCr to RGB. The hardware uses the following + * formulas: + * + * Y = 16 + 0.2500 R + 0.5000 G + 0.1094 B * Cb = 128 - 0.1406 R - 0.2969 G + 0.4375 B * Cr = 128 + 0.4375 R - 0.3750 G - 0.0625 B * - * The inverse matrix is thus: + * This seems to be based on limited range BT.601 with Q1.6 + * precision. + * + * The inverse matrix is: + * * [[1,1636, -0,0623, 1,6008] * [1,1636, -0,4045, -0,7949] * [1,1636, 1,9912, -0,0250]] |