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{ "id": 24074, "url": "https://patchwork.libcamera.org/api/patches/24074/?format=api", "web_url": "https://patchwork.libcamera.org/patch/24074/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/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": "<20250808141315.413839-4-stefan.klug@ideasonboard.com>", "date": "2025-08-08T14:12:41", "name": "[v2,03/16] libipa: camera_sensor_helper: Add quantizeGain() function", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "f0ef2e8081d15f49018158b3bafc58434f758b68", "submitter": { "id": 184, "url": "https://patchwork.libcamera.org/api/people/184/?format=api", "name": "Stefan Klug", "email": "stefan.klug@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/24074/mbox/", "series": [ { "id": 5364, "url": "https://patchwork.libcamera.org/api/series/5364/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=5364", "date": "2025-08-08T14:12:38", "name": "Implement WDR algorithm", "version": 2, "mbox": "https://patchwork.libcamera.org/series/5364/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/24074/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/24074/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 C1968BDCC1\n\tfor <parsemail@patchwork.libcamera.org>;\n\tFri, 8 Aug 2025 14:13:53 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 7D1F869221;\n\tFri, 8 Aug 2025 16:13:53 +0200 (CEST)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 176CF6921C\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tFri, 8 Aug 2025 16:13:52 +0200 (CEST)", "from ideasonboard.com (unknown\n\t[IPv6:2a00:6020:448c:6c00:3ea1:35ac:90da:a221])\n\tby perceval.ideasonboard.com (Postfix) with UTF8SMTPSA id 314CF42D0; \n\tFri, 8 Aug 2025 16:13:02 +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=\"wfl++2kv\"; dkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1754662382;\n\tbh=iT03ipL+lnvUK0FZKqO3DvtO5ANT+3w79AyDtnbnQEs=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=wfl++2kvSplL8Strj2CPkAC9VEsQxlkZQITuhqw7sCFPQY/yZZiCtz5W2uHeo4h/g\n\tOYIOC9geLEiteiYKvg4/NPJE6D7fv40Ci4hOwyDn8hWBWY61cJuDyK0o6C8KyEB4Px\n\tgH5gGgPD57q8jVbics3sMEiJiGm1V/euBTGbXoz8=", "From": "Stefan Klug <stefan.klug@ideasonboard.com>", "To": "libcamera-devel@lists.libcamera.org", "Cc": "Stefan Klug <stefan.klug@ideasonboard.com>", "Subject": "[PATCH v2 03/16] libipa: camera_sensor_helper: Add quantizeGain()\n\tfunction", "Date": "Fri, 8 Aug 2025 16:12:41 +0200", "Message-ID": "<20250808141315.413839-4-stefan.klug@ideasonboard.com>", "X-Mailer": "git-send-email 2.48.1", "In-Reply-To": "<20250808141315.413839-1-stefan.klug@ideasonboard.com>", "References": "<20250808141315.413839-1-stefan.klug@ideasonboard.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": "<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": "Add a small utility function that calculates the quantized gain that\ngets applied by a sensor when the gain code is set to gainCode(gain).\nThis is needed by algorithms to calculate a digital correction gain that\ngets applied to mitigate the error introduce by quantization.\n\nSigned-off-by: Stefan Klug <stefan.klug@ideasonboard.com>\n---\n src/ipa/libipa/camera_sensor_helper.cpp | 23 +++++++++++++++++++++++\n src/ipa/libipa/camera_sensor_helper.h | 1 +\n 2 files changed, 24 insertions(+)", "diff": "diff --git a/src/ipa/libipa/camera_sensor_helper.cpp b/src/ipa/libipa/camera_sensor_helper.cpp\nindex dcd69d9f2bbb..0a7b66cd003a 100644\n--- a/src/ipa/libipa/camera_sensor_helper.cpp\n+++ b/src/ipa/libipa/camera_sensor_helper.cpp\n@@ -131,6 +131,29 @@ double CameraSensorHelper::gain(uint32_t gainCode) const\n \t}\n }\n \n+/**\n+ * \\brief Quantize the given gain value\n+ * \\param[in] _gain The real gain\n+ * \\param[out] quantizationGain The gain that is lost due to quantization\n+ *\n+ * This function returns the actual gain that get's applied when the sensors\n+ * gain is set to gainCode(gain).\n+ *\n+ * It shall be guaranteed that gainCode(gain) == gainCode(quantizeGain(gain)).\n+ *\n+ * If \\a quantizationGain is provided it is filled with the gain that is lost\n+ * due to quantization.\n+ *\n+ * \\return The quantized real gain\n+ */\n+double CameraSensorHelper::quantizeGain(double _gain, double *quantizationGain) const\n+{\n+\tdouble g = gain(gainCode(_gain));\n+\tif (quantizationGain)\n+\t\t*quantizationGain = _gain / g;\n+\treturn g;\n+}\n+\n /**\n * \\struct CameraSensorHelper::AnalogueGainLinear\n * \\brief Analogue gain constants for the linear gain model\ndiff --git a/src/ipa/libipa/camera_sensor_helper.h b/src/ipa/libipa/camera_sensor_helper.h\nindex a9300a64f1e7..42bdb3c5550f 100644\n--- a/src/ipa/libipa/camera_sensor_helper.h\n+++ b/src/ipa/libipa/camera_sensor_helper.h\n@@ -29,6 +29,7 @@ public:\n \tstd::optional<int16_t> blackLevel() const { return blackLevel_; }\n \tvirtual uint32_t gainCode(double gain) const;\n \tvirtual double gain(uint32_t gainCode) const;\n+\tvirtual double quantizeGain(double gain, double *quantizationGain) const;\n \n protected:\n \tstruct AnalogueGainLinear {\n", "prefixes": [ "v2", "03/16" ] }