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GET /api/1.1/patches/14229/?format=api
{ "id": 14229, "url": "https://patchwork.libcamera.org/api/1.1/patches/14229/?format=api", "web_url": "https://patchwork.libcamera.org/patch/14229/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/1.1/projects/1/?format=api", "name": "libcamera", "link_name": "libcamera", "list_id": "libcamera_core", "list_email": "libcamera-devel@lists.libcamera.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20211021164401.110033-10-jeanmichel.hautbois@ideasonboard.com>", "date": "2021-10-21T16:43:56", "name": "[libcamera-devel,v3,09/14] ipa: ipu3: agc: Simplify division of exposure/gain", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "cc2167263aeb4c7b5d1efd56f928016291f7800b", "submitter": { "id": 75, "url": "https://patchwork.libcamera.org/api/1.1/people/75/?format=api", "name": "Jean-Michel Hautbois", "email": "jeanmichel.hautbois@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/14229/mbox/", "series": [ { "id": 2646, "url": "https://patchwork.libcamera.org/api/1.1/series/2646/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=2646", "date": "2021-10-21T16:43:47", "name": "ipa: ipu3: Fix AGC bugs", "version": 3, "mbox": "https://patchwork.libcamera.org/series/2646/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/14229/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/14229/checks/", "tags": {}, "headers": { "Return-Path": "<libcamera-devel-bounces@lists.libcamera.org>", "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 79FA6C324E\n\tfor <parsemail@patchwork.libcamera.org>;\n\tThu, 21 Oct 2021 16:44:17 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 3485468F67;\n\tThu, 21 Oct 2021 18:44:17 +0200 (CEST)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 543CB68F65\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tThu, 21 Oct 2021 18:44:07 +0200 (CEST)", "from tatooine.ideasonboard.com (unknown\n\t[IPv6:2a01:e0a:169:7140:f9d:5926:ad90:4996])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id E3CE81BF9;\n\tThu, 21 Oct 2021 18:44:06 +0200 (CEST)" ], "Authentication-Results": "lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"i/70ghJs\"; dkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1634834647;\n\tbh=1fvnUVg/yH6VB5c9tJHL1bOaHUCOYL8HY+KmS3iCQp4=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=i/70ghJs6HTdnWVy7zMPcNZVtE6JGMx7vgBheL0Lw0hVxc0B3f3FbDzoqsk56Ew8P\n\tzh99RqWhAWIXKJ/8WpCJMwt5OeotcfDLjpt0C0IM2gI8oOcDzPsy/eoqCEgeW43+Iw\n\tsMueSpVXpzYsuBWGyc+t0vRu8XhD3sbZs6ZRCySI=", "From": "Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>", "To": "libcamera-devel@lists.libcamera.org", "Date": "Thu, 21 Oct 2021 18:43:56 +0200", "Message-Id": "<20211021164401.110033-10-jeanmichel.hautbois@ideasonboard.com>", "X-Mailer": "git-send-email 2.32.0", "In-Reply-To": "<20211021164401.110033-1-jeanmichel.hautbois@ideasonboard.com>", "References": "<20211021164401.110033-1-jeanmichel.hautbois@ideasonboard.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH v3 09/14] ipa: ipu3: agc: Simplify\n\tdivision of exposure/gain", "X-BeenThere": "libcamera-devel@lists.libcamera.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "Until now, the algorithm makes complex assumptions when dividing the\nexposure and analogue gain values. Instead, use a simpler clamping of\nthe shutter speed first, and then of the analogue gain, based on the\nlimits configured.\n\nSigned-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>\nReviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>\n---\n src/ipa/ipu3/algorithms/agc.cpp | 36 +++++++++++++++++----------------\n 1 file changed, 19 insertions(+), 17 deletions(-)", "diff": "diff --git a/src/ipa/ipu3/algorithms/agc.cpp b/src/ipa/ipu3/algorithms/agc.cpp\nindex f5bb3328..6f5b6a45 100644\n--- a/src/ipa/ipu3/algorithms/agc.cpp\n+++ b/src/ipa/ipu3/algorithms/agc.cpp\n@@ -147,7 +147,9 @@ void Agc::lockExposureGain(uint32_t &exposure, double &gain)\n \t\t\t\t << \" Gain \" << gain;\n \n \t\tcurrentExposure_ = currentExposureNoDg_ * newGain;\n+\t\tutils::Duration minShutterSpeed = minExposureLines_ * lineDuration_;\n \t\tutils::Duration maxShutterSpeed = maxExposureLines_ * lineDuration_;\n+\n \t\tutils::Duration maxTotalExposure = maxShutterSpeed * kMaxGain;\n \t\tcurrentExposure_ = std::min(currentExposure_, maxTotalExposure);\n \t\tLOG(IPU3Agc, Debug) << \"Target total exposure \" << currentExposure_\n@@ -156,23 +158,23 @@ void Agc::lockExposureGain(uint32_t &exposure, double &gain)\n \t\t/* \\todo: estimate if we need to desaturate */\n \t\tfilterExposure();\n \n-\t\tutils::Duration newExposure = 0.0s;\n-\t\tif (currentShutter < maxShutterSpeed) {\n-\t\t\texposure = std::clamp<uint32_t>(exposure * filteredExposure_ / currentExposureNoDg_,\n-\t\t\t\t\t\t\tminExposureLines_,\n-\t\t\t\t\t\t\tmaxExposureLines_);\n-\t\t\tnewExposure = filteredExposure_ / exposure;\n-\t\t\tgain = std::clamp(gain * filteredExposure_ / newExposure,\n-\t\t\t\t\t kMinGain, kMaxGain);\n-\t\t} else {\n-\t\t\tgain = std::clamp(gain * filteredExposure_ / currentExposureNoDg_,\n-\t\t\t\t\t kMinGain, kMaxGain);\n-\t\t\tnewExposure = filteredExposure_ / gain;\n-\t\t\texposure = std::clamp<uint32_t>(exposure * filteredExposure_ / newExposure,\n-\t\t\t\t\t\t\tminExposureLines_,\n-\t\t\t\t\t\t\tmaxExposureLines_);\n-\t\t}\n-\t\tLOG(IPU3Agc, Debug) << \"Adjust exposure \" << exposure * lineDuration_ << \" and gain \" << gain;\n+\t\tutils::Duration exposureValue = filteredExposure_;\n+\t\tutils::Duration shutterTime = minShutterSpeed;\n+\n+\t\t/*\n+\t\t * Push the shutter time up to the maximum first, and only then\n+\t\t * increase the gain.\n+\t\t */\n+\t\tshutterTime = std::clamp<utils::Duration>(exposureValue / kMinGain,\n+\t\t\t\t\t\t\t minShutterSpeed, maxShutterSpeed);\n+\t\tdouble stepGain = std::clamp(exposureValue / shutterTime,\n+\t\t\t\t\t kMinGain, kMaxGain);\n+\t\tLOG(IPU3Agc, Debug) << \"Divided up shutter and gain are \"\n+\t\t\t\t << shutterTime << \" and \"\n+\t\t\t\t << stepGain;\n+\n+\t\texposure = shutterTime / lineDuration_;\n+\t\tgain = stepGain;\n \t}\n \tlastFrame_ = frameCount_;\n }\n", "prefixes": [ "libcamera-devel", "v3", "09/14" ] }