diff options
| author | Naushir Patuck <naush@raspberrypi.com> | 2023-09-15 16:58:40 +0100 |
|---|---|---|
| committer | Jacopo Mondi <jacopo.mondi@ideasonboard.com> | 2023-09-16 17:33:44 +0200 |
| commit | cd940f7fd3a0636c79bfcb2ebb462e17f92cb987 (patch) | |
| tree | ec5480aaaa2637aa621de28e6b45e99235464127 /src/ipa/rpi | |
| parent | e5f0846695908ff162206ec120c0614df0eca3f8 (diff) | |
ipa: rpi: histogram: Add interBinMean()
Add a new helper function Histogram::interBinMean() that essentially
replaces the existing Histogram::interQuantileMean() logic but working on
bins instead.
Rework the interQuantileMean() to call into interBinMean() with the
appropriate convertion from quatiles to bins.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Diffstat (limited to 'src/ipa/rpi')
| -rw-r--r-- | src/ipa/rpi/controller/histogram.cpp | 22 | ||||
| -rw-r--r-- | src/ipa/rpi/controller/histogram.h | 2 |
2 files changed, 16 insertions, 8 deletions
diff --git a/src/ipa/rpi/controller/histogram.cpp b/src/ipa/rpi/controller/histogram.cpp index 16a9207f..0a27ba2c 100644 --- a/src/ipa/rpi/controller/histogram.cpp +++ b/src/ipa/rpi/controller/histogram.cpp @@ -45,20 +45,26 @@ double Histogram::quantile(double q, int first, int last) const return first + frac; } -double Histogram::interQuantileMean(double qLo, double qHi) const +double Histogram::interBinMean(double binLo, double binHi) const { - assert(qHi > qLo); - double pLo = quantile(qLo); - double pHi = quantile(qHi, (int)pLo); + assert(binHi > binLo); double sumBinFreq = 0, cumulFreq = 0; - for (double pNext = floor(pLo) + 1.0; pNext <= ceil(pHi); - pLo = pNext, pNext += 1.0) { - int bin = floor(pLo); + for (double binNext = floor(binLo) + 1.0; binNext <= ceil(binHi); + binLo = binNext, binNext += 1.0) { + int bin = floor(binLo); double freq = (cumulative_[bin + 1] - cumulative_[bin]) * - (std::min(pNext, pHi) - pLo); + (std::min(binNext, binHi) - binLo); sumBinFreq += bin * freq; cumulFreq += freq; } /* add 0.5 to give an average for bin mid-points */ return sumBinFreq / cumulFreq + 0.5; } + +double Histogram::interQuantileMean(double qLo, double qHi) const +{ + assert(qHi > qLo); + double pLo = quantile(qLo); + double pHi = quantile(qHi, (int)pLo); + return interBinMean(pLo, pHi); +} diff --git a/src/ipa/rpi/controller/histogram.h b/src/ipa/rpi/controller/histogram.h index 6b3e3a9e..e2c5509b 100644 --- a/src/ipa/rpi/controller/histogram.h +++ b/src/ipa/rpi/controller/histogram.h @@ -38,6 +38,8 @@ public: uint64_t total() const { return cumulative_[cumulative_.size() - 1]; } /* Cumulative frequency up to a (fractional) point in a bin. */ uint64_t cumulativeFreq(double bin) const; + /* Return the mean value between two (fractional) bins. */ + double interBinMean(double binLo, double binHi) const; /* * Return the (fractional) bin of the point q (0 <= q <= 1) through the * histogram. Optionally provide limits to help. |