{"id":27410,"url":"https://patchwork.libcamera.org/api/patches/27410/?format=json","web_url":"https://patchwork.libcamera.org/patch/27410/","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":"<20260720-libipa-algorithms-v6-19-ececb73f97cb@ideasonboard.com>","date":"2026-07-20T14:59:37","name":"[v6,19/31] ipa: libipa: lsc_base: Add sampleForCrop documentation","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"088ffed4f35d6ebfb7aa5a607ee3e4baa48a4a83","submitter":{"id":143,"url":"https://patchwork.libcamera.org/api/people/143/?format=json","name":"Jacopo Mondi","email":"jacopo.mondi@ideasonboard.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/27410/mbox/","series":[{"id":6067,"url":"https://patchwork.libcamera.org/api/series/6067/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=6067","date":"2026-07-20T14:59:18","name":"ipa: libipa: Introduce libipa algorithms","version":6,"mbox":"https://patchwork.libcamera.org/series/6067/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/27410/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/27410/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 5D44BC3334\n\tfor ;\n\tMon, 20 Jul 2026 15:00:10 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id D572067E9E;\n\tMon, 20 Jul 2026 17:00:09 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id DFC8567E6A\n\tfor ;\n\tMon, 20 Jul 2026 16:59:51 +0200 (CEST)","from [192.168.1.106] (mob-5-90-63-152.net.vodafone.it\n\t[5.90.63.152])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 14688258D;\n\tMon, 20 Jul 2026 16:58:53 +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=\"EY0IdF4C\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1784559533;\n\tbh=WYRREtMMsGnWekfpemz4LN4fohagCWU8KMsfNpvYOME=;\n\th=From:Date:Subject:References:In-Reply-To:To:Cc:From;\n\tb=EY0IdF4CathMbXPKFTRI7MCV6KmDKYN8ZbX0DW9XrwHpBP4xG94/ax7z5ozwgvnKe\n\t38sDJMjU5OJbV2bOoIN/lXEtaFCg2Odsz1HG+bT8VMS5nGPKYeFXyHwQUIbSMADKvq\n\tgfLOuVobEG8j33IscU2t1nOaZcjQhCxgSp4vTx7U=","From":"Jacopo Mondi ","Date":"Mon, 20 Jul 2026 16:59:37 +0200","Subject":"[PATCH v6 19/31] ipa: libipa: lsc_base: Add sampleForCrop\n\tdocumentation","MIME-Version":"1.0","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","Message-Id":"<20260720-libipa-algorithms-v6-19-ececb73f97cb@ideasonboard.com>","References":"<20260720-libipa-algorithms-v6-0-ececb73f97cb@ideasonboard.com>","In-Reply-To":"<20260720-libipa-algorithms-v6-0-ececb73f97cb@ideasonboard.com>","To":"libcamera-devel@lists.libcamera.org, \n\tStefan Klug , \n\tMilan Zamazal ","Cc":"Jacopo Mondi ","X-Mailer":"b4 0.14.3","X-Developer-Signature":"v=1; a=openpgp-sha256; l=1459;\n\ti=jacopo.mondi@ideasonboard.com; h=from:subject:message-id;\n\tbh=WYRREtMMsGnWekfpemz4LN4fohagCWU8KMsfNpvYOME=;\n\tb=owEBbQKS/ZANAwAKAXI0Bo8WoVY8AcsmYgBqXjfY/Sfb4nPV6mPVmSsANnJEBHtj50MKPuN2a\n\tSQZiBpxx0iJAjMEAAEKAB0WIQS1xD1IgJogio9YOMByNAaPFqFWPAUCal432AAKCRByNAaPFqFW\n\tPPETD/9H0mJiFKwvWD3105IXCK1Gx0f2DcPVmz26e0wW/5o+PlHCBDaNoelIfh5YnI5Bn4sU6Hl\n\tOuhRJ2D8Q/Cw4Nf7tYZztWYPltlATxLsMvhLtSCpE1HRK+hriOIdH1L2/ZlRL9+nRsFHSBmWjEQ\n\tTQItwQgL8sh8dCaOpBuVMRe6lfqrWOs+oP9EtrYUMyaIG8IMNOLDkaLMW1UoL4duGJ3M4T3BBKC\n\tlTWMm6Qt8+bIH7FRTq1n1nti9ys3srv96hWRvmu0nGNK3MeD/0Luhi5sJc5lJbeY1vm7IPksY0g\n\tQXquHDKr80K46M1vd4Li8jbu+6JnslXaENB8E/8kGUoULSogBlwGQq4Hne/grO2nqLKY0sSs6Iy\n\tZ7ckEBzXtIuLgcS/AXiQ257bvLWF90ueo1O9y46FLbw+5H+aHGLB6pqTD1awBH8Ac7zhUGnQ5/Q\n\tfGqJNsMhxPQEgH+lELke1v5ryk7WOddlCGcNPb+NSdV3qjpYQ81XtNj5aS9KFJZTj4/mE7dI55b\n\tc/YsuMxlJ798dITHJ05/akDlcnwPazcSeZPBWk9/avUZD/U8Ij9Aslmt3czUuJocsMHcE3B2DfZ\n\thg4IBhugsATpmpeFCHlYEfUm1l/PTsJyZes1i5semjBQo2ywL0mQszf8Cgrt6djkpjR+0l9vE47\n\toGgxeJgCIQ0XrbQ==","X-Developer-Key":"i=jacopo.mondi@ideasonboard.com; a=openpgp;\n\tfpr=72392EDC88144A65C701EA9BA5826A2587AD026B","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":"Now that we have two in-tree implementations of LscImplementation\ndetail how the two perform lsc gain re-sampling.\n\nSigned-off-by: Jacopo Mondi \n---\n src/ipa/libipa/lsc_base.cpp | 15 +++++++++++++++\n 1 file changed, 15 insertions(+)","diff":"diff --git a/src/ipa/libipa/lsc_base.cpp b/src/ipa/libipa/lsc_base.cpp\nindex b50460394925..1015cdc7cf4c 100644\n--- a/src/ipa/libipa/lsc_base.cpp\n+++ b/src/ipa/libipa/lsc_base.cpp\n@@ -103,6 +103,21 @@ void Interpolator::\n * each segment of size 0.0625 and the list of nodes position will be\n * [0, 0.0625, 0.125, 0.1875, ... , 1]. It is expected that the first position\n * is 0 and the last position is 1.\n+ *\n+ * LSC tables are expressed in two formats:\n+ * - A list of gain values (LscTable)\n+ * - A radial polynomial (LscPolynomial)\n+ *\n+ * Table-based LSC tables are generated using an image at a fixed resolution and\n+ * can't at the moment be re-sampled when a different resolution is used for a\n+ * streaming session. Re-sampling a grid LSC table will return the same table\n+ * as loaded from the tuning file.\n+ *\n+ * \\todo: Implement grid based re-sampling\n+ *\n+ * Polynomial configurations are more flexible and can be re-sampled for a given\n+ * sensor frame resolution using a list of horizontal and vertical nodes that\n+ * define the LSC grid on which the polynomial is re-sampled on.\n */\n \n } /* namespace ipa */\n","prefixes":["v6","19/31"]}