{"id":21496,"url":"https://patchwork.libcamera.org/api/patches/21496/?format=json","web_url":"https://patchwork.libcamera.org/patch/21496/","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":"<20241003080228.25438-3-naush@raspberrypi.com>","date":"2024-10-03T08:02:27","name":"[v2,2/2] ipa: rpi: awb: Add a bias to the AWB search","commit_ref":null,"pull_url":null,"state":"accepted","archived":false,"hash":"68e6717b3bdc490e7763f11388ee460c5a500f1b","submitter":{"id":34,"url":"https://patchwork.libcamera.org/api/people/34/?format=json","name":"Naushir Patuck","email":"naush@raspberrypi.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/21496/mbox/","series":[{"id":4652,"url":"https://patchwork.libcamera.org/api/series/4652/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=4652","date":"2024-10-03T08:02:25","name":"RPi: AWB bias","version":2,"mbox":"https://patchwork.libcamera.org/series/4652/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/21496/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/21496/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 762CFC3263\n\tfor ;\n\tThu, 3 Oct 2024 08:02:21 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id D100763528;\n\tThu, 3 Oct 2024 10:02:19 +0200 (CEST)","from mail-wm1-x330.google.com (mail-wm1-x330.google.com\n\t[IPv6:2a00:1450:4864:20::330])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 9D58E6351F\n\tfor ;\n\tThu, 3 Oct 2024 10:02:14 +0200 (CEST)","by mail-wm1-x330.google.com with SMTP id\n\t5b1f17b1804b1-42f7e1fcb8dso988945e9.2\n\tfor ;\n\tThu, 03 Oct 2024 01:02:14 -0700 (PDT)","from naush-laptop.pitowers.org ([93.93.133.154])\n\tby smtp.gmail.com with ESMTPSA id\n\tffacd0b85a97d-37d082a6b69sm684952f8f.88.2024.10.03.01.02.13\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tThu, 03 Oct 2024 01:02:13 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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\n\tThu, 03 Oct 2024 01:02:13 -0700 (PDT)","From":"Naushir Patuck ","To":"libcamera-devel@lists.libcamera.org","Cc":"Naushir Patuck ,\n\tDavid Plowman ","Subject":"[PATCH v2 2/2] ipa: rpi: awb: Add a bias to the AWB search","Date":"Thu, 3 Oct 2024 09:02:27 +0100","Message-Id":"<20241003080228.25438-3-naush@raspberrypi.com>","X-Mailer":"git-send-email 2.34.1","In-Reply-To":"<20241003080228.25438-1-naush@raspberrypi.com>","References":"<20241003080228.25438-1-naush@raspberrypi.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","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","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"In the case of an AWB search failure, the current algorithm logic will\nreturn a point on the CT curve closest to where the search finisned.\nThis can be quite undesirable. Instead, add some bias params to the AWB\nalgorithm which will direct the search to a set CT value in the case\nwhere statistics become unreliable causing the search to fail.\n\nSigned-off-by: Naushir Patuck \nReviewed-by: David Plowman \n---\n src/ipa/rpi/controller/rpi/awb.cpp | 23 +++++++++++++++++++++--\n src/ipa/rpi/controller/rpi/awb.h | 4 ++++\n 2 files changed, 25 insertions(+), 2 deletions(-)","diff":"diff --git a/src/ipa/rpi/controller/rpi/awb.cpp b/src/ipa/rpi/controller/rpi/awb.cpp\nindex 3904fed615f7..2ab405ef395a 100644\n--- a/src/ipa/rpi/controller/rpi/awb.cpp\n+++ b/src/ipa/rpi/controller/rpi/awb.cpp\n@@ -169,6 +169,14 @@ int AwbConfig::read(const libcamera::YamlObject ¶ms)\n \twhitepointB = params[\"whitepoint_b\"].get(0.0);\n \tif (bayes == false)\n \t\tsensitivityR = sensitivityB = 1.0; /* nor do sensitivities make any sense */\n+\t/*\n+\t * The biasProportion parameter adds a small proportion of the counted\n+\t * pixles to a region biased to the biasCT colour temperature.\n+\t *\n+\t * A typical value for biasProportion would be between 0.05 to 0.1.\n+\t */\n+\tbiasProportion = params[\"bias_proportion\"].get(0.0);\n+\tbiasCT = params[\"bias_ct\"].get(DefaultCT);\n \treturn 0;\n }\n \n@@ -409,7 +417,8 @@ void Awb::asyncFunc()\n \n static void generateStats(std::vector &zones,\n \t\t\t StatisticsPtr &stats, double minPixels,\n-\t\t\t double minG, Metadata &globalMetadata)\n+\t\t\t double minG, Metadata &globalMetadata,\n+\t\t\t double biasProportion, double biasCtR, double biasCtB)\n {\n \tstd::scoped_lock l(globalMetadata);\n \n@@ -422,6 +431,14 @@ static void generateStats(std::vector &zones,\n \t\t\t\tcontinue;\n \t\t\tzone.R = region.val.rSum / region.counted;\n \t\t\tzone.B = region.val.bSum / region.counted;\n+\t\t\t/*\n+\t\t\t * Add some bias samples to allow the search to tend to a\n+\t\t\t * bias CT in failure cases.\n+\t\t\t */\n+\t\t\tconst unsigned int proportion = biasProportion * region.counted;\n+\t\t\tzone.R += proportion * biasCtR;\n+\t\t\tzone.B += proportion * biasCtB;\n+\t\t\tzone.G += proportion * 1.0;\n \t\t\t/* Factor in the ALSC applied colour shading correction if required. */\n \t\t\tconst AlscStatus *alscStatus = globalMetadata.getLocked(\"alsc.status\");\n \t\t\tif (stats->colourStatsPos == Statistics::ColourStatsPos::PreLsc && alscStatus) {\n@@ -442,7 +459,9 @@ void Awb::prepareStats()\n \t * any LSC compensation. We also ignore config_.fast in this version.\n \t */\n \tgenerateStats(zones_, statistics_, config_.minPixels,\n-\t\t config_.minG, getGlobalMetadata());\n+\t\t config_.minG, getGlobalMetadata(),\n+\t\t config_.biasProportion, config_.ctR.eval(config_.biasCT),\n+\t\t config_.ctB.eval(config_.biasCT));\n \t/*\n \t * apply sensitivities, so values appear to come from our \"canonical\"\n \t * sensor.\ndiff --git a/src/ipa/rpi/controller/rpi/awb.h b/src/ipa/rpi/controller/rpi/awb.h\nindex ab30f4fa51c1..5d628b47c8a6 100644\n--- a/src/ipa/rpi/controller/rpi/awb.h\n+++ b/src/ipa/rpi/controller/rpi/awb.h\n@@ -87,6 +87,10 @@ struct AwbConfig {\n \tdouble whitepointR;\n \tdouble whitepointB;\n \tbool bayes; /* use Bayesian algorithm */\n+\t/* proportion of counted samples to add for the search bias */\n+\tdouble biasProportion;\n+\t/* CT target for the search bias */\n+\tdouble biasCT;\n };\n \n class Awb : public AwbAlgorithm\n","prefixes":["v2","2/2"]}