[{"id":31143,"web_url":"https://patchwork.libcamera.org/comment/31143/","msgid":"<2dfdb7a6-a761-4670-b411-4994a67eaeac@ideasonboard.com>","date":"2024-09-09T21:07:14","subject":"Re: [PATCH v6 13/18] libcamera: software_isp: Move black level to an\n\talgorithm module","submitter":{"id":156,"url":"https://patchwork.libcamera.org/api/people/156/","name":"Dan Scally","email":"dan.scally@ideasonboard.com"},"content":"Hi Milan\n\nOn 06/09/2024 13:09, Milan Zamazal wrote:\n> The black level determination, already present as a separate class, can\n> be moved to the prepared Algorithm processing structure. It is the\n> first of the current software ISP algorithms that is called in the stats\n> processing sequence, which means it is also the first one that should be\n> moved to the new structure. Stats processing starts with calling\n> Algorithm-based processing so the call order of the algorithms is\n> retained.\n>\n> Movement of this algorithm is relatively straightforward because all it\n> does is processing stats.\n>\n> The comment about getting black level from the tuning files is dropped.\n> The black level will be taken from CameraSensorHelper if available and\n> that will be implemented in one of the followup patches.\n>\n> Black level is now recomputed on each stats processing. In a future\n> patch, after DelayedControls are used, this will be changed to recompute\n> the black level only after exposure/gain changes.\n>\n> The black level depends on the sensor used, the computed value can be\n> reused in a followup capture sessions with the same sensor. Thus it is\n> sufficient to (re)set the initial value in BlackLevel::init.\n>\n> Signed-off-by: Milan Zamazal \n> Reviewed-by: Umang Jain \n> Reviewed-by: Laurent Pinchart \nReviewed-by: Daniel Scally \n> ---\n> src/ipa/simple/algorithms/blc.cpp | 71 ++++++++++++++++++++\n> src/ipa/simple/algorithms/blc.h | 32 +++++++++\n> src/ipa/simple/algorithms/meson.build | 1 +\n> src/ipa/simple/black_level.cpp | 93 ---------------------------\n> src/ipa/simple/black_level.h | 33 ----------\n> src/ipa/simple/data/uncalibrated.yaml | 1 +\n> src/ipa/simple/ipa_context.cpp | 8 +++\n> src/ipa/simple/ipa_context.h | 5 ++\n> src/ipa/simple/meson.build | 1 -\n> src/ipa/simple/soft_simple.cpp | 8 +--\n> 10 files changed, 120 insertions(+), 133 deletions(-)\n> create mode 100644 src/ipa/simple/algorithms/blc.cpp\n> create mode 100644 src/ipa/simple/algorithms/blc.h\n> delete mode 100644 src/ipa/simple/black_level.cpp\n> delete mode 100644 src/ipa/simple/black_level.h\n>\n> diff --git a/src/ipa/simple/algorithms/blc.cpp b/src/ipa/simple/algorithms/blc.cpp\n> new file mode 100644\n> index 00000000..08f4345e\n> --- /dev/null\n> +++ b/src/ipa/simple/algorithms/blc.cpp\n> @@ -0,0 +1,71 @@\n> +/* SPDX-License-Identifier: LGPL-2.1-or-later */\n> +/*\n> + * Copyright (C) 2024, Red Hat Inc.\n> + *\n> + * Black level handling\n> + */\n> +\n> +#include \"blc.h\"\n> +\n> +#include \n> +\n> +#include \n> +\n> +namespace libcamera {\n> +\n> +namespace ipa::soft::algorithms {\n> +\n> +LOG_DEFINE_CATEGORY(IPASoftBL)\n> +\n> +BlackLevel::BlackLevel()\n> +{\n> +}\n> +\n> +int BlackLevel::init(IPAContext &context,\n> +\t\t [[maybe_unused]] const YamlObject &tuningData)\n> +{\n> +\tcontext.activeState.blc.level = 255;\n> +\treturn 0;\n> +}\n> +\n> +void BlackLevel::process(IPAContext &context,\n> +\t\t\t [[maybe_unused]] const uint32_t frame,\n> +\t\t\t [[maybe_unused]] IPAFrameContext &frameContext,\n> +\t\t\t const SwIspStats *stats,\n> +\t\t\t [[maybe_unused]] ControlList &metadata)\n> +{\n> +\tconst SwIspStats::Histogram &histogram = stats->yHistogram;\n> +\n> +\t/*\n> +\t * The constant is selected to be \"good enough\", not overly\n> +\t * conservative or aggressive. There is no magic about the given value.\n> +\t */\n> +\tconstexpr float ignoredPercentage = 0.02;\n> +\tconst unsigned int total =\n> +\t\tstd::accumulate(begin(histogram), end(histogram), 0);\n> +\tconst unsigned int pixelThreshold = ignoredPercentage * total;\n> +\tconst unsigned int histogramRatio = 256 / SwIspStats::kYHistogramSize;\n> +\tconst unsigned int currentBlackIdx =\n> +\t\tcontext.activeState.blc.level / histogramRatio;\n> +\n> +\tfor (unsigned int i = 0, seen = 0;\n> +\t i < currentBlackIdx && i < SwIspStats::kYHistogramSize;\n> +\t i++) {\n> +\t\tseen += histogram[i];\n> +\t\tif (seen >= pixelThreshold) {\n> +\t\t\tcontext.activeState.blc.level = i * histogramRatio;\n> +\t\t\tLOG(IPASoftBL, Debug)\n> +\t\t\t\t<< \"Auto-set black level: \"\n> +\t\t\t\t<< i << \"/\" << SwIspStats::kYHistogramSize\n> +\t\t\t\t<< \" (\" << 100 * (seen - histogram[i]) / total << \"% below, \"\n> +\t\t\t\t<< 100 * seen / total << \"% at or below)\";\n> +\t\t\tbreak;\n> +\t\t}\n> +\t};\n> +}\n> +\n> +REGISTER_IPA_ALGORITHM(BlackLevel, \"BlackLevel\")\n> +\n> +} /* namespace ipa::soft::algorithms */\n> +\n> +} /* namespace libcamera */\n> diff --git a/src/ipa/simple/algorithms/blc.h b/src/ipa/simple/algorithms/blc.h\n> new file mode 100644\n> index 00000000..c2140b4b\n> --- /dev/null\n> +++ b/src/ipa/simple/algorithms/blc.h\n> @@ -0,0 +1,32 @@\n> +/* SPDX-License-Identifier: LGPL-2.1-or-later */\n> +/*\n> + * Copyright (C) 2024, Red Hat Inc.\n> + *\n> + * Black level handling\n> + */\n> +\n> +#pragma once\n> +\n> +#include \"algorithm.h\"\n> +\n> +namespace libcamera {\n> +\n> +namespace ipa::soft::algorithms {\n> +\n> +class BlackLevel : public Algorithm\n> +{\n> +public:\n> +\tBlackLevel();\n> +\t~BlackLevel() = default;\n> +\n> +\tint init(IPAContext &context, const YamlObject &tuningData)\n> +\t\toverride;\n> +\tvoid process(IPAContext &context, const uint32_t frame,\n> +\t\t IPAFrameContext &frameContext,\n> +\t\t const SwIspStats *stats,\n> +\t\t ControlList &metadata) override;\n> +};\n> +\n> +} /* namespace ipa::soft::algorithms */\n> +\n> +} /* namespace libcamera */\n> diff --git a/src/ipa/simple/algorithms/meson.build b/src/ipa/simple/algorithms/meson.build\n> index 31d26e43..1f63c220 100644\n> --- a/src/ipa/simple/algorithms/meson.build\n> +++ b/src/ipa/simple/algorithms/meson.build\n> @@ -1,4 +1,5 @@\n> # SPDX-License-Identifier: CC0-1.0\n> \n> soft_simple_ipa_algorithms = files([\n> + 'blc.cpp',\n> ])\n> diff --git a/src/ipa/simple/black_level.cpp b/src/ipa/simple/black_level.cpp\n> deleted file mode 100644\n> index 37e0109c..00000000\n> --- a/src/ipa/simple/black_level.cpp\n> +++ /dev/null\n> @@ -1,93 +0,0 @@\n> -/* SPDX-License-Identifier: LGPL-2.1-or-later */\n> -/*\n> - * Copyright (C) 2024, Red Hat Inc.\n> - *\n> - * black level handling\n> - */\n> -\n> -#include \"black_level.h\"\n> -\n> -#include \n> -\n> -#include \n> -\n> -namespace libcamera {\n> -\n> -LOG_DEFINE_CATEGORY(IPASoftBL)\n> -\n> -namespace ipa::soft {\n> -\n> -/**\n> - * \\class BlackLevel\n> - * \\brief Object providing black point level for software ISP\n> - *\n> - * Black level can be provided in hardware tuning files or, if no tuning file is\n> - * available for the given hardware, guessed automatically, with less accuracy.\n> - * As tuning files are not yet implemented for software ISP, BlackLevel\n> - * currently provides only guessed black levels.\n> - *\n> - * This class serves for tracking black level as a property of the underlying\n> - * hardware, not as means of enhancing a particular scene or image.\n> - *\n> - * The class is supposed to be instantiated for the given camera stream.\n> - * The black level can be retrieved using BlackLevel::get() method. It is\n> - * initially 0 and may change when updated using BlackLevel::update() method.\n> - */\n> -\n> -BlackLevel::BlackLevel()\n> -\t: blackLevel_(255), blackLevelSet_(false)\n> -{\n> -}\n> -\n> -/**\n> - * \\brief Return the current black level\n> - *\n> - * \\return The black level, in the range from 0 (minimum) to 255 (maximum).\n> - * If the black level couldn't be determined yet, return 0.\n> - */\n> -uint8_t BlackLevel::get() const\n> -{\n> -\treturn blackLevelSet_ ? blackLevel_ : 0;\n> -}\n> -\n> -/**\n> - * \\brief Update black level from the provided histogram\n> - * \\param[in] yHistogram The histogram to be used for updating black level\n> - *\n> - * The black level is property of the given hardware, not image. It is updated\n> - * only if it has not been yet set or if it is lower than the lowest value seen\n> - * so far.\n> - */\n> -void BlackLevel::update(SwIspStats::Histogram &yHistogram)\n> -{\n> -\t/*\n> -\t * The constant is selected to be \"good enough\", not overly conservative or\n> -\t * aggressive. There is no magic about the given value.\n> -\t */\n> -\tconstexpr float ignoredPercentage_ = 0.02;\n> -\tconst unsigned int total =\n> -\t\tstd::accumulate(begin(yHistogram), end(yHistogram), 0);\n> -\tconst unsigned int pixelThreshold = ignoredPercentage_ * total;\n> -\tconst unsigned int histogramRatio = 256 / SwIspStats::kYHistogramSize;\n> -\tconst unsigned int currentBlackIdx = blackLevel_ / histogramRatio;\n> -\n> -\tfor (unsigned int i = 0, seen = 0;\n> -\t i < currentBlackIdx && i < SwIspStats::kYHistogramSize;\n> -\t i++) {\n> -\t\tseen += yHistogram[i];\n> -\t\tif (seen >= pixelThreshold) {\n> -\t\t\tblackLevel_ = i * histogramRatio;\n> -\t\t\tblackLevelSet_ = true;\n> -\t\t\tLOG(IPASoftBL, Debug)\n> -\t\t\t\t<< \"Auto-set black level: \"\n> -\t\t\t\t<< i << \"/\" << SwIspStats::kYHistogramSize\n> -\t\t\t\t<< \" (\" << 100 * (seen - yHistogram[i]) / total << \"% below, \"\n> -\t\t\t\t<< 100 * seen / total << \"% at or below)\";\n> -\t\t\tbreak;\n> -\t\t}\n> -\t};\n> -}\n> -\n> -} /* namespace ipa::soft */\n> -\n> -} /* namespace libcamera */\n> diff --git a/src/ipa/simple/black_level.h b/src/ipa/simple/black_level.h\n> deleted file mode 100644\n> index a04230c9..00000000\n> --- a/src/ipa/simple/black_level.h\n> +++ /dev/null\n> @@ -1,33 +0,0 @@\n> -/* SPDX-License-Identifier: LGPL-2.1-or-later */\n> -/*\n> - * Copyright (C) 2024, Red Hat Inc.\n> - *\n> - * black level handling\n> - */\n> -\n> -#pragma once\n> -\n> -#include \n> -#include \n> -\n> -#include \"libcamera/internal/software_isp/swisp_stats.h\"\n> -\n> -namespace libcamera {\n> -\n> -namespace ipa::soft {\n> -\n> -class BlackLevel\n> -{\n> -public:\n> -\tBlackLevel();\n> -\tuint8_t get() const;\n> -\tvoid update(SwIspStats::Histogram &yHistogram);\n> -\n> -private:\n> -\tuint8_t blackLevel_;\n> -\tbool blackLevelSet_;\n> -};\n> -\n> -} /* namespace ipa::soft */\n> -\n> -} /* namespace libcamera */\n> diff --git a/src/ipa/simple/data/uncalibrated.yaml b/src/ipa/simple/data/uncalibrated.yaml\n> index 2cdc39a8..e0d03d96 100644\n> --- a/src/ipa/simple/data/uncalibrated.yaml\n> +++ b/src/ipa/simple/data/uncalibrated.yaml\n> @@ -3,4 +3,5 @@\n> ---\n> version: 1\n> algorithms:\n> + - BlackLevel:\n> ...\n> diff --git a/src/ipa/simple/ipa_context.cpp b/src/ipa/simple/ipa_context.cpp\n> index 3c1c7262..268cff32 100644\n> --- a/src/ipa/simple/ipa_context.cpp\n> +++ b/src/ipa/simple/ipa_context.cpp\n> @@ -50,4 +50,12 @@ namespace libcamera::ipa::soft {\n> * \\brief The current state of IPA algorithms\n> */\n> \n> +/**\n> + * \\var IPAActiveState::black\n> + * \\brief Context for the Black Level algorithm\n> + *\n> + * \\var IPAActiveState::black.level\n> + * \\brief Current determined black level\n> + */\n> +\n> } /* namespace libcamera::ipa::soft */\n> diff --git a/src/ipa/simple/ipa_context.h b/src/ipa/simple/ipa_context.h\n> index e7d8b8df..ac2a59d7 100644\n> --- a/src/ipa/simple/ipa_context.h\n> +++ b/src/ipa/simple/ipa_context.h\n> @@ -7,6 +7,8 @@\n> \n> #pragma once\n> \n> +#include \n> +\n> #include \n> \n> namespace libcamera {\n> @@ -17,6 +19,9 @@ struct IPASessionConfiguration {\n> };\n> \n> struct IPAActiveState {\n> +\tstruct {\n> +\t\tuint8_t level;\n> +\t} blc;\n> };\n> \n> struct IPAFrameContext : public FrameContext {\n> diff --git a/src/ipa/simple/meson.build b/src/ipa/simple/meson.build\n> index dcd7c70a..2f9f15f4 100644\n> --- a/src/ipa/simple/meson.build\n> +++ b/src/ipa/simple/meson.build\n> @@ -8,7 +8,6 @@ ipa_name = 'ipa_soft_simple'\n> soft_simple_sources = files([\n> 'ipa_context.cpp',\n> 'soft_simple.cpp',\n> - 'black_level.cpp',\n> ])\n> \n> soft_simple_sources += soft_simple_ipa_algorithms\n> diff --git a/src/ipa/simple/soft_simple.cpp b/src/ipa/simple/soft_simple.cpp\n> index 5beec45a..3332e2b1 100644\n> --- a/src/ipa/simple/soft_simple.cpp\n> +++ b/src/ipa/simple/soft_simple.cpp\n> @@ -29,7 +29,6 @@\n> \n> #include \"libipa/camera_sensor_helper.h\"\n> \n> -#include \"black_level.h\"\n> #include \"module.h\"\n> \n> namespace libcamera {\n> @@ -61,7 +60,7 @@ class IPASoftSimple : public ipa::soft::IPASoftInterface, public Module\n> {\n> public:\n> \tIPASoftSimple()\n> -\t\t: params_(nullptr), stats_(nullptr), blackLevel_(BlackLevel()),\n> +\t\t: params_(nullptr), stats_(nullptr),\n> \t\t context_({ {}, {}, { kMaxFrameContexts } }),\n> \t\t ignoreUpdates_(0)\n> \t{\n> @@ -93,7 +92,6 @@ private:\n> \tSwIspStats *stats_;\n> \tstd::unique_ptr camHelper_;\n> \tControlInfoMap sensorInfoMap_;\n> -\tBlackLevel blackLevel_;\n> \n> \tstatic constexpr unsigned int kGammaLookupSize = 1024;\n> \tstd::array gammaTable_;\n> @@ -303,9 +301,7 @@ void IPASoftSimple::processStats(const uint32_t frame,\n> \t\talgo->process(context_, frame, frameContext, stats_, metadata);\n> \n> \tSwIspStats::Histogram histogram = stats_->yHistogram;\n> -\tif (ignoreUpdates_ > 0)\n> -\t\tblackLevel_.update(histogram);\n> -\tconst uint8_t blackLevel = blackLevel_.get();\n> +\tconst uint8_t blackLevel = context_.activeState.blc.level;\n> \n> \t/*\n> \t * Black level must be subtracted to get the correct AWB ratios, they","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 A4F79C324C\n\tfor ;\n\tMon, 9 Sep 2024 21:07:36 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 682B5634F8;\n\tMon, 9 Sep 2024 23:07:35 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id E22EB634EE\n\tfor ;\n\tMon, 9 Sep 2024 23:07:33 +0200 (CEST)","from [192.168.0.53] (213-229-8-243.static.upcbusiness.at\n\t[213.229.8.243])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 6F04D827;\n\tMon, 9 Sep 2024 23:06:17 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"uXuTeoTl\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1725915977;\n\tbh=/ysr7hNW7akxRxU7WRWduw+RMLrpwyDUgyyuCLZdp+M=;\n\th=Date:Subject:To:Cc:References:From:In-Reply-To:From;\n\tb=uXuTeoTljIXOugDl/0/4dukdXnetTVlRL99BzjCnO2euh+mG5p71HcoWEeH5+CG/n\n\t3+Ah17mOCs0R4cvAYkBbZ2X5yvbjtGzBh9YCXJamriqERitN2zhPcR06WthbDNoumv\n\tvwhRyT4DVT8l//AO8PLBdc5bxem6IiX0pRXnZEsM=","Message-ID":"<2dfdb7a6-a761-4670-b411-4994a67eaeac@ideasonboard.com>","Date":"Mon, 9 Sep 2024 22:07:14 +0100","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","Subject":"Re: [PATCH v6 13/18] libcamera: software_isp: Move black level to an\n\talgorithm module","To":"Milan Zamazal , libcamera-devel@lists.libcamera.org","Cc":"Umang Jain ,\n\tLaurent Pinchart ","References":"<20240906120927.4071508-1-mzamazal@redhat.com>\n\t<20240906120927.4071508-14-mzamazal@redhat.com>","Content-Language":"en-US","From":"Dan Scally ","Autocrypt":"addr=dan.scally@ideasonboard.com; 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