[{"id":33060,"web_url":"https://patchwork.libcamera.org/comment/33060/","msgid":"","date":"2025-01-13T22:22:55","subject":"Re: [PATCH v1 03/11] libipa: Add AWB algorithm base class","submitter":{"id":17,"url":"https://patchwork.libcamera.org/api/people/17/","name":"Paul Elder","email":"paul.elder@ideasonboard.com"},"content":"On Thu, Jan 09, 2025 at 12:53:54PM +0100, Stefan Klug wrote:\n> Add a class to provide a generic interface for auto white balance\n> algorithms. Concrete AWB algorithms are expected to subclass the\n> AwbAlgorithm class to implement their functionality.\n> \n> Pipeline handlers are expected to subclass the AwbStats class and\n> implement the necessary function to give the algorithm access to the\n> hardware specific statistics data.\n> \n> Signed-off-by: Stefan Klug \n\nThe code/design looks great. Just some english comments...\n\n> ---\n> src/ipa/libipa/awb.cpp | 137 +++++++++++++++++++++++++++++++++++++\n> src/ipa/libipa/awb.h | 51 ++++++++++++++\n> src/ipa/libipa/meson.build | 2 +\n> 3 files changed, 190 insertions(+)\n> create mode 100644 src/ipa/libipa/awb.cpp\n> create mode 100644 src/ipa/libipa/awb.h\n> \n> diff --git a/src/ipa/libipa/awb.cpp b/src/ipa/libipa/awb.cpp\n> new file mode 100644\n> index 000000000000..74e88d513b27\n> --- /dev/null\n> +++ b/src/ipa/libipa/awb.cpp\n> @@ -0,0 +1,137 @@\n> +/* SPDX-License-Identifier: LGPL-2.1-or-later */\n> +/*\n> + * Copyright (C) 2024 Ideas on Board Oy\n> + *\n> + * Generic AWB algorithms\n> + */\n> +\n> +#include \"awb.h\"\n> +\n> +#include \n> +\n> +/**\n> + * \\file awb.h\n> + * \\brief Base classes for AWB algorithms\n> + */\n> +\n> +namespace libcamera {\n> +\n> +LOG_DEFINE_CATEGORY(Awb)\n> +\n> +namespace ipa {\n> +\n> +/**\n> + * \\class AwbResult\n> + * \\brief The result of an awb calculation\n> + *\n> + * This class holds the result of an auto white balance calculation.\n> + */\n> +\n> +/**\n> + * \\var AwbResult::gains\n> + * \\brief The calculated white balance gains\n> + */\n> +\n> +/**\n> + * \\var AwbResult::colourTemperature\n> + * \\brief The calculated colour temperature in Kelvin\n> + */\n> +\n> +/**\n> + * \\class AwbStats\n> + * \\brief A abstract class wrapping system specific AWB statistics\n\nI think \"An abstract class that wraps system-specific AWB statistics\"\nmight be better.\n\n> + *\n> + * Pipline handlers using an AWB algorithm based on the AwbAlgorithm class need\n\ns/Pipline/Pipeline/\n\n> + * to implement this class to give the algorithm access to the hardware specific\n\ns/hardware specific/hardware-specific/\n\n> + * statics data.\n\ns/statics/statistics/\n\n> + */\n> +\n> +/**\n> + * \\fn AwbStats::computeColourError\n> + * \\brief Compute an error value for when the given gains would be applied\n> + * \\param[in] gains The gains to apply\n> + *\n> + * Compute an error value (non-greyness) assuming the given \\a gains would be\n> + * applied. To keep the actual implementations computationally inexpensive,\n> + * the squared colour error shall be returned.\n> + *\n> + * If the awb statistics provide multiple zones, the sum over all zones needs to\n> + * calculated.\n> + *\n> + * \\return The computed error value\n> + */\n> +\n> +/**\n> + * \\fn AwbStats::getRGBMeans\n> + * \\brief Get RGB means of the statistics\n> + *\n> + * Fetch the RGB means from the statistics. The values of each channel are\n> + * dimensionless and only the ratios are used for further calculations. This is\n> + * used by the simple gray world model to calculate the gains to apply.\n> + *\n> + * \\return The RGB means\n> + */\n> +\n> +/**\n> + * \\class AwbAlgorithm\n> + * \\brief A base class for auto white balance algorithms\n> + *\n> + * This class is a base class for auto white balance algorithms. It provides an\n> + * interface for the algorithms to implement, and is used by the pipeline\n> + * handler to interact with the concrete implementation.\n\nI thought the IPAs interact with the algos and not the pipeline\nhandler... (unless there's a surprise in later patches that I haven't\nseen yet).\n\n> + */\n> +\n> +/**\n> + * \\fn AwbAlgorithm::init\n> + * \\brief Initialize the algorithm with the given tuning data\n> + * \\param[in] tuningData The tuning data to use for the algorithm\n> + *\n> + * \\return 0 on success, a negative error code otherwise\n> + */\n> +\n> +/**\n> + * \\fn AwbAlgorithm::calculateAwb\n> + * \\brief Calculate awb data from the given statistics\n> + * \\param[in] stats The statistics to use for the calculation\n> + * \\param[in] lux The lux value of the scene\n> + *\n> + * Calculate a AwbResult object from the given statistics and lux value. A \\a\n\ns/ a / an /\n\n> + * lux value of 0 means it is unknown or invalid and the algorithm shall ignore\n> + * it.\n> + *\n> + * \\return The awb result\n> + */\n> +\n> +/**\n> + * \\fn AwbAlgorithm::gainsFromColourTemperature\n> + * \\brief Compute white balance gains from a colour temperature\n> + * \\param[in] colourTemperature The colour temperature in Kelvin\n> + *\n> + * Compute the white balance gains from a \\a colourTemperature. This function\n> + * does not take any statistics into account. It is used to compute the colour\n> + * gains when the user manually specifies a colour temperature.\n> + *\n> + * \\return The colour gains\n> + */\n> +\n> +/**\n> + * \\fn AwbAlgorithm::controls\n> + * \\brief Get the controls info map for this algorithm\n> + *\n> + * \\return The controls info map\n> + */\n> +\n> +/**\n> + * \\fn AwbAlgorithm::handleControls\n\nA bit of bikeshedding perhaps but personally I'd prefer \"processControls\". Up to you though :)\n\n\nThanks,\n\nPaul\n\n> + * \\param[in] controls The controls to handle\n> + * \\brief Handle the controls supplied in a request\n> + */\n> +\n> +/**\n> + * \\var AwbAlgorithm::controls_\n> + * \\brief Controls info map for the controls provided by the algorithm\n> + */\n> +\n> +} /* namespace ipa */\n> +\n> +} /* namespace libcamera */\n> diff --git a/src/ipa/libipa/awb.h b/src/ipa/libipa/awb.h\n> new file mode 100644\n> index 000000000000..2dd471606ec4\n> --- /dev/null\n> +++ b/src/ipa/libipa/awb.h\n> @@ -0,0 +1,51 @@\n> +/* SPDX-License-Identifier: LGPL-2.1-or-later */\n> +/*\n> + * Copyright (C) 2024 Ideas on Board Oy\n> + *\n> + * Generic AWB algorithms\n> + */\n> +\n> +#pragma once\n> +\n> +#include \n> +#include \"libcamera/internal/yaml_parser.h\"\n> +\n> +#include \"vector.h\"\n> +\n> +namespace libcamera {\n> +\n> +namespace ipa {\n> +\n> +struct AwbResult {\n> +\tRGB gains;\n> +\tdouble colourTemperature;\n> +};\n> +\n> +struct AwbStats {\n> +\tvirtual double computeColourError(const RGB &gains) const = 0;\n> +\tvirtual RGB getRGBMeans() const = 0;\n> +};\n> +\n> +class AwbAlgorithm\n> +{\n> +public:\n> +\tvirtual ~AwbAlgorithm() = default;\n> +\n> +\tvirtual int init(const YamlObject &tuningData) = 0;\n> +\tvirtual AwbResult calculateAwb(const AwbStats &stats, int lux) = 0;\n> +\tvirtual RGB gainsFromColourTemperature(double colourTemperature) = 0;\n> +\n> +\tconst ControlInfoMap::Map &controls() const\n> +\t{\n> +\t\treturn controls_;\n> +\t}\n> +\n> +\tvirtual void handleControls([[maybe_unused]] const ControlList &controls) {}\n> +\n> +protected:\n> +\tControlInfoMap::Map controls_;\n> +};\n> +\n> +} /* namespace ipa */\n> +\n> +} /* namespace libcamera */\n> diff --git a/src/ipa/libipa/meson.build b/src/ipa/libipa/meson.build\n> index f2b2f4be50db..03e879c5834f 100644\n> --- a/src/ipa/libipa/meson.build\n> +++ b/src/ipa/libipa/meson.build\n> @@ -3,6 +3,7 @@\n> libipa_headers = files([\n> 'agc_mean_luminance.h',\n> 'algorithm.h',\n> + 'awb.h',\n> 'camera_sensor_helper.h',\n> 'colours.h',\n> 'exposure_mode_helper.h',\n> @@ -20,6 +21,7 @@ libipa_headers = files([\n> libipa_sources = files([\n> 'agc_mean_luminance.cpp',\n> 'algorithm.cpp',\n> + 'awb.cpp',\n> 'camera_sensor_helper.cpp',\n> 'colours.cpp',\n> 'exposure_mode_helper.cpp',\n> -- \n> 2.43.0\n>","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 4FC29BD1F1\n\tfor ;\n\tMon, 13 Jan 2025 22:23:33 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 749E76851C;\n\tMon, 13 Jan 2025 23:23:32 +0100 (CET)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 1114B684E7\n\tfor ;\n\tMon, 13 Jan 2025 23:23:31 +0100 (CET)","from pyrite.rasen.tech (unknown [173.16.167.215])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 7943B74A;\n\tMon, 13 Jan 2025 23:22:33 +0100 (CET)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"fC33W75I\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1736806954;\n\tbh=BS1Y7ErH0M/WJVahtcsUMrtt8hIec2QQw3lcvvxUFyU=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=fC33W75IKmmHmrZGRZNNVI3vv9mCe49xxXR9L47hCvmGxpV07eZ3DUI4fxrw3Uv04\n\tDfqoGLezppVVK++SCdTV4ucutz/aI5aHwT1V4iE6qfIayLGqpNQpCPlw8/fXLUQIeT\n\tmOfZk8EpKN9H/yNKaJ6gw7ligyYRfvzIr6m8qoQE=","Date":"Mon, 13 Jan 2025 16:22:55 -0600","From":"Paul Elder ","To":"Stefan Klug ","Cc":"libcamera-devel@lists.libcamera.org","Subject":"Re: [PATCH v1 03/11] libipa: Add AWB algorithm base class","Message-ID":"","References":"<20250109115412.356768-1-stefan.klug@ideasonboard.com>\n\t<20250109115412.356768-4-stefan.klug@ideasonboard.com>","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20250109115412.356768-4-stefan.klug@ideasonboard.com>","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\" "}},{"id":33092,"web_url":"https://patchwork.libcamera.org/comment/33092/","msgid":"<20f28688-1b73-4e45-9303-322781f69989@ideasonboard.com>","date":"2025-01-17T14:30:29","subject":"Re: [PATCH v1 03/11] libipa: Add AWB algorithm base class","submitter":{"id":156,"url":"https://patchwork.libcamera.org/api/people/156/","name":"Dan Scally","email":"dan.scally@ideasonboard.com"},"content":"Hi Stefan, thanks for the cool set\n\nOn 09/01/2025 11:53, Stefan Klug wrote:\n> Add a class to provide a generic interface for auto white balance\n> algorithms. Concrete AWB algorithms are expected to subclass the\n> AwbAlgorithm class to implement their functionality.\n>\n> Pipeline handlers are expected to subclass the AwbStats class and\n> implement the necessary function to give the algorithm access to the\n> hardware specific statistics data.\n\n\nThat sounds strange; I'd expect the IPA to handle that rather than the PipelineHandler\n\n>\n> Signed-off-by: Stefan Klug \n> ---\n> src/ipa/libipa/awb.cpp | 137 +++++++++++++++++++++++++++++++++++++\n> src/ipa/libipa/awb.h | 51 ++++++++++++++\n> src/ipa/libipa/meson.build | 2 +\n> 3 files changed, 190 insertions(+)\n> create mode 100644 src/ipa/libipa/awb.cpp\n> create mode 100644 src/ipa/libipa/awb.h\n>\n> diff --git a/src/ipa/libipa/awb.cpp b/src/ipa/libipa/awb.cpp\n> new file mode 100644\n> index 000000000000..74e88d513b27\n> --- /dev/null\n> +++ b/src/ipa/libipa/awb.cpp\n> @@ -0,0 +1,137 @@\n> +/* SPDX-License-Identifier: LGPL-2.1-or-later */\n> +/*\n> + * Copyright (C) 2024 Ideas on Board Oy\n> + *\n> + * Generic AWB algorithms\n> + */\n> +\n> +#include \"awb.h\"\n> +\n> +#include \n> +\n> +/**\n> + * \\file awb.h\n> + * \\brief Base classes for AWB algorithms\n> + */\n> +\n> +namespace libcamera {\n> +\n> +LOG_DEFINE_CATEGORY(Awb)\n> +\n> +namespace ipa {\n> +\n> +/**\n> + * \\class AwbResult\n> + * \\brief The result of an awb calculation\n> + *\n> + * This class holds the result of an auto white balance calculation.\n> + */\n> +\n> +/**\n> + * \\var AwbResult::gains\n> + * \\brief The calculated white balance gains\n> + */\n> +\n> +/**\n> + * \\var AwbResult::colourTemperature\n> + * \\brief The calculated colour temperature in Kelvin\n> + */\n> +\n> +/**\n> + * \\class AwbStats\n> + * \\brief A abstract class wrapping system specific AWB statistics\ns/A/An here, and I think I'd say \"An abstraction class wrapping hardware specific...\" but that's \njust bikeshedding so feel free to ignore it.\n> + *\n> + * Pipline handlers using an AWB algorithm based on the AwbAlgorithm class need\n> + * to implement this class to give the algorithm access to the hardware specific\n> + * statics data.\ns/statics/statistics\n> + */\n> +\n> +/**\n> + * \\fn AwbStats::computeColourError\n> + * \\brief Compute an error value for when the given gains would be applied\n> + * \\param[in] gains The gains to apply\n> + *\n> + * Compute an error value (non-greyness) assuming the given \\a gains would be\n> + * applied. To keep the actual implementations computationally inexpensive,\n> + * the squared colour error shall be returned.\n> + *\n> + * If the awb statistics provide multiple zones, the sum over all zones needs to\n> + * calculated.\n> + *\n> + * \\return The computed error value\n> + */\n> +\n> +/**\n> + * \\fn AwbStats::getRGBMeans\n> + * \\brief Get RGB means of the statistics\n> + *\n> + * Fetch the RGB means from the statistics. The values of each channel are\n> + * dimensionless and only the ratios are used for further calculations. This is\n> + * used by the simple gray world model to calculate the gains to apply.\n> + *\n> + * \\return The RGB means\n> + */\n> +\n> +/**\n> + * \\class AwbAlgorithm\n> + * \\brief A base class for auto white balance algorithms\n> + *\n> + * This class is a base class for auto white balance algorithms. It provides an\n> + * interface for the algorithms to implement, and is used by the pipeline\n> + * handler to interact with the concrete implementation.\n\nI think s/provides/defines, and it should be used by the IPA rather than the pipeline handler.\n\n\nOtherwise, looks good:\n\n\nReviewed-by: Daniel Scally \n\n> + */\n> +\n> +/**\n> + * \\fn AwbAlgorithm::init\n> + * \\brief Initialize the algorithm with the given tuning data\n> + * \\param[in] tuningData The tuning data to use for the algorithm\n> + *\n> + * \\return 0 on success, a negative error code otherwise\n> + */\n> +\n> +/**\n> + * \\fn AwbAlgorithm::calculateAwb\n> + * \\brief Calculate awb data from the given statistics\n> + * \\param[in] stats The statistics to use for the calculation\n> + * \\param[in] lux The lux value of the scene\n> + *\n> + * Calculate a AwbResult object from the given statistics and lux value. A \\a\n> + * lux value of 0 means it is unknown or invalid and the algorithm shall ignore\n> + * it.\n> + *\n> + * \\return The awb result\n> + */\n> +\n> +/**\n> + * \\fn AwbAlgorithm::gainsFromColourTemperature\n> + * \\brief Compute white balance gains from a colour temperature\n> + * \\param[in] colourTemperature The colour temperature in Kelvin\n> + *\n> + * Compute the white balance gains from a \\a colourTemperature. This function\n> + * does not take any statistics into account. It is used to compute the colour\n> + * gains when the user manually specifies a colour temperature.\n> + *\n> + * \\return The colour gains\n> + */\n> +\n> +/**\n> + * \\fn AwbAlgorithm::controls\n> + * \\brief Get the controls info map for this algorithm\n> + *\n> + * \\return The controls info map\n> + */\n> +\n> +/**\n> + * \\fn AwbAlgorithm::handleControls\n> + * \\param[in] controls The controls to handle\n> + * \\brief Handle the controls supplied in a request\n> + */\n> +\n> +/**\n> + * \\var AwbAlgorithm::controls_\n> + * \\brief Controls info map for the controls provided by the algorithm\n> + */\n> +\n> +} /* namespace ipa */\n> +\n> +} /* namespace libcamera */\n> diff --git a/src/ipa/libipa/awb.h b/src/ipa/libipa/awb.h\n> new file mode 100644\n> index 000000000000..2dd471606ec4\n> --- /dev/null\n> +++ b/src/ipa/libipa/awb.h\n> @@ -0,0 +1,51 @@\n> +/* SPDX-License-Identifier: LGPL-2.1-or-later */\n> +/*\n> + * Copyright (C) 2024 Ideas on Board Oy\n> + *\n> + * Generic AWB algorithms\n> + */\n> +\n> +#pragma once\n> +\n> +#include \n> +#include \"libcamera/internal/yaml_parser.h\"\n> +\n> +#include \"vector.h\"\n> +\n> +namespace libcamera {\n> +\n> +namespace ipa {\n> +\n> +struct AwbResult {\n> +\tRGB gains;\n> +\tdouble colourTemperature;\n> +};\n> +\n> +struct AwbStats {\n> +\tvirtual double computeColourError(const RGB &gains) const = 0;\n> +\tvirtual RGB getRGBMeans() const = 0;\n> +};\n> +\n> +class AwbAlgorithm\n> +{\n> +public:\n> +\tvirtual ~AwbAlgorithm() = default;\n> +\n> +\tvirtual int init(const YamlObject &tuningData) = 0;\n> +\tvirtual AwbResult calculateAwb(const AwbStats &stats, int lux) = 0;\n> +\tvirtual RGB gainsFromColourTemperature(double colourTemperature) = 0;\n> +\n> +\tconst ControlInfoMap::Map &controls() const\n> +\t{\n> +\t\treturn controls_;\n> +\t}\n> +\n> +\tvirtual void handleControls([[maybe_unused]] const ControlList &controls) {}\n> +\n> +protected:\n> +\tControlInfoMap::Map controls_;\n> +};\n> +\n> +} /* namespace ipa */\n> +\n> +} /* namespace libcamera */\n> diff --git a/src/ipa/libipa/meson.build b/src/ipa/libipa/meson.build\n> index f2b2f4be50db..03e879c5834f 100644\n> --- a/src/ipa/libipa/meson.build\n> +++ b/src/ipa/libipa/meson.build\n> @@ -3,6 +3,7 @@\n> libipa_headers = files([\n> 'agc_mean_luminance.h',\n> 'algorithm.h',\n> + 'awb.h',\n> 'camera_sensor_helper.h',\n> 'colours.h',\n> 'exposure_mode_helper.h',\n> @@ -20,6 +21,7 @@ libipa_headers = files([\n> libipa_sources = files([\n> 'agc_mean_luminance.cpp',\n> 'algorithm.cpp',\n> + 'awb.cpp',\n> 'camera_sensor_helper.cpp',\n> 'colours.cpp',\n> 'exposure_mode_helper.cpp',","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 BCE49C3273\n\tfor ;\n\tFri, 17 Jan 2025 14:30:34 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id A7B8E68545;\n\tFri, 17 Jan 2025 15:30:33 +0100 (CET)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id C7CB668516\n\tfor ;\n\tFri, 17 Jan 2025 15:30:31 +0100 (CET)","from [192.168.0.43]\n\t(cpc141996-chfd3-2-0-cust928.12-3.cable.virginm.net [86.13.91.161])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 79B176DE\n\tfor ;\n\tFri, 17 Jan 2025 15:29:32 +0100 (CET)"],"Authentication-Results":"lancelot.ideasonboard.com; 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