{"id":19015,"url":"https://patchwork.libcamera.org/api/patches/19015/?format=json","web_url":"https://patchwork.libcamera.org/patch/19015/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20230915122954.5231-2-david.plowman@raspberrypi.com>","date":"2023-09-15T12:29:50","name":"[libcamera-devel,v4,1/5] ipa: rpi: histogram: Add interBinMean()","commit_ref":null,"pull_url":null,"state":"accepted","archived":false,"hash":"0fe24a22affc8b48f66507a8ae46f849a586d373","submitter":{"id":42,"url":"https://patchwork.libcamera.org/api/people/42/?format=json","name":"David Plowman","email":"david.plowman@raspberrypi.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/19015/mbox/","series":[{"id":4024,"url":"https://patchwork.libcamera.org/api/series/4024/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=4024","date":"2023-09-15T12:29:49","name":"Multi-channel AGC","version":4,"mbox":"https://patchwork.libcamera.org/series/4024/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/19015/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/19015/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 87DE2C3260\n\tfor ;\n\tFri, 15 Sep 2023 12:30:21 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 6179B62919;\n\tFri, 15 Sep 2023 14:30:20 +0200 (CEST)","from mail-wr1-x42e.google.com (mail-wr1-x42e.google.com\n\t[IPv6:2a00:1450:4864:20::42e])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 1BF92628EC\n\tfor ;\n\tFri, 15 Sep 2023 14:30:19 +0200 (CEST)","by mail-wr1-x42e.google.com with SMTP id\n\tffacd0b85a97d-31c4d5bd69cso1940619f8f.3\n\tfor ;\n\tFri, 15 Sep 2023 05:30:19 -0700 (PDT)","from localhost.localdomain ([195.180.61.40])\n\tby smtp.gmail.com with ESMTPSA id\n\ty14-20020a7bcd8e000000b004030e8ff964sm7435009wmj.34.2023.09.15.05.30.17\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tFri, 15 Sep 2023 05:30:17 -0700 (PDT)"],"DKIM-Signature":["v=1; 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\n\tFri, 15 Sep 2023 05:30:18 -0700 (PDT)","To":"libcamera-devel@lists.libcamera.org","Date":"Fri, 15 Sep 2023 13:29:50 +0100","Message-Id":"<20230915122954.5231-2-david.plowman@raspberrypi.com>","X-Mailer":"git-send-email 2.30.2","In-Reply-To":"<20230915122954.5231-1-david.plowman@raspberrypi.com>","References":"<20230915122954.5231-1-david.plowman@raspberrypi.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH v4 1/5] ipa: rpi: histogram: Add\n\tinterBinMean()","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","From":"David Plowman via libcamera-devel ","Reply-To":"David Plowman ","Cc":"Jacopo Mondi ","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"From: Naushir Patuck \n\nAdd a new helper function Histogram::interBinMean() that essentially\nreplaces the existing Histogram::interQuantileMean() logic but working on\nbins instead.\n\nRework the interQuantileMean() to call into interBinMean() with the\nappropriate convertion from quatiles to bins.\n\nSigned-off-by: Naushir Patuck \nReviewed-by: David Plowman \nReviewed-by: Jacopo Mondi \n---\n src/ipa/rpi/controller/histogram.cpp | 22 ++++++++++++++--------\n src/ipa/rpi/controller/histogram.h | 2 ++\n 2 files changed, 16 insertions(+), 8 deletions(-)","diff":"diff --git a/src/ipa/rpi/controller/histogram.cpp b/src/ipa/rpi/controller/histogram.cpp\nindex 16a9207f..0a27ba2c 100644\n--- a/src/ipa/rpi/controller/histogram.cpp\n+++ b/src/ipa/rpi/controller/histogram.cpp\n@@ -45,20 +45,26 @@ double Histogram::quantile(double q, int first, int last) const\n \treturn first + frac;\n }\n \n-double Histogram::interQuantileMean(double qLo, double qHi) const\n+double Histogram::interBinMean(double binLo, double binHi) const\n {\n-\tassert(qHi > qLo);\n-\tdouble pLo = quantile(qLo);\n-\tdouble pHi = quantile(qHi, (int)pLo);\n+\tassert(binHi > binLo);\n \tdouble sumBinFreq = 0, cumulFreq = 0;\n-\tfor (double pNext = floor(pLo) + 1.0; pNext <= ceil(pHi);\n-\t pLo = pNext, pNext += 1.0) {\n-\t\tint bin = floor(pLo);\n+\tfor (double binNext = floor(binLo) + 1.0; binNext <= ceil(binHi);\n+\t binLo = binNext, binNext += 1.0) {\n+\t\tint bin = floor(binLo);\n \t\tdouble freq = (cumulative_[bin + 1] - cumulative_[bin]) *\n-\t\t\t (std::min(pNext, pHi) - pLo);\n+\t\t\t (std::min(binNext, binHi) - binLo);\n \t\tsumBinFreq += bin * freq;\n \t\tcumulFreq += freq;\n \t}\n \t/* add 0.5 to give an average for bin mid-points */\n \treturn sumBinFreq / cumulFreq + 0.5;\n }\n+\n+double Histogram::interQuantileMean(double qLo, double qHi) const\n+{\n+\tassert(qHi > qLo);\n+\tdouble pLo = quantile(qLo);\n+\tdouble pHi = quantile(qHi, (int)pLo);\n+\treturn interBinMean(pLo, pHi);\n+}\ndiff --git a/src/ipa/rpi/controller/histogram.h b/src/ipa/rpi/controller/histogram.h\nindex 6b3e3a9e..e2c5509b 100644\n--- a/src/ipa/rpi/controller/histogram.h\n+++ b/src/ipa/rpi/controller/histogram.h\n@@ -38,6 +38,8 @@ public:\n \tuint64_t total() const { return cumulative_[cumulative_.size() - 1]; }\n \t/* Cumulative frequency up to a (fractional) point in a bin. */\n \tuint64_t cumulativeFreq(double bin) const;\n+\t/* Return the mean value between two (fractional) bins. */\n+\tdouble interBinMean(double binLo, double binHi) const;\n \t/*\n \t * Return the (fractional) bin of the point q (0 <= q <= 1) through the\n \t * histogram. Optionally provide limits to help.\n","prefixes":["libcamera-devel","v4","1/5"]}