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histmatching: use better spaced points for the generated curve

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This commit is contained in:
Alberto Griggio
2018-08-13 14:18:59 +02:00
parent 2f2065cf9a
commit 97e73457ee
1 changed files with 5 additions and 14 deletions
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19
rtengine/histmatching.cc
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@@ -221,26 +221,17 @@ void mappingToCurve(const std::vector<int> &mapping, std::vector<double> &curve)
curve = { DCT_Linear }; // not enough points, fall back to linear
} else {
CubicSplineCurve c(curve);
double mid = coord(idx);
double gap = 0.05;
double x = 0.0;
constexpr double shgap = 0.075;
curve = { DCT_Spline };
while (mid - x > shgap / 2) {
while (x < 1.0) {
curve.push_back(x);
curve.push_back(c.getVal(x));
x += shgap;
}
curve.push_back(mid);
curve.push_back(c.getVal(mid));
constexpr double hlgap = 0.2;
x = mid + hlgap;
while (1 - x > hlgap / 2) {
curve.push_back(x);
curve.push_back(c.getVal(x));
x += hlgap;
x += gap;
gap *= 1.4;
}
curve.push_back(1.0);
curve.push_back(1.0);
curve.push_back(c.getVal(1.0));
}
}