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{ "id": 23293, "url": "https://patchwork.libcamera.org/api/1.1/patches/23293/?format=api", "web_url": "https://patchwork.libcamera.org/patch/23293/", "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": "<20250428103604.151551-2-david.plowman@raspberrypi.com>", "date": "2025-04-28T10:36:03", "name": "[1/2] utils: raspberrypi: ctt: Fix NaNs in lens shading tables", "commit_ref": "36ba0e5515075f87490048aa1d5f57b6c3864bae", "pull_url": null, "state": "accepted", "archived": false, "hash": "e5e92574d849143c1c8154697a6d578811d6ffca", "submitter": { "id": 42, "url": "https://patchwork.libcamera.org/api/1.1/people/42/?format=api", "name": "David Plowman", "email": "david.plowman@raspberrypi.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/23293/mbox/", "series": [ { "id": 5149, "url": "https://patchwork.libcamera.org/api/1.1/series/5149/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=5149", "date": "2025-04-28T10:36:02", "name": "Raspberry Pi Camera Tuning Tool fixes", "version": 1, "mbox": "https://patchwork.libcamera.org/series/5149/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/23293/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/23293/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 A1E8AC32A2\n\tfor <parsemail@patchwork.libcamera.org>;\n\tMon, 28 Apr 2025 10:36:14 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 81FE268AD3;\n\tMon, 28 Apr 2025 12:36:11 +0200 (CEST)", "from mail-wm1-x32c.google.com (mail-wm1-x32c.google.com\n\t[IPv6:2a00:1450:4864:20::32c])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id B028A617E0\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tMon, 28 Apr 2025 12:36:08 +0200 (CEST)", "by mail-wm1-x32c.google.com with SMTP id\n\t5b1f17b1804b1-43cf257158fso26079645e9.2\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tMon, 28 Apr 2025 03:36:08 -0700 (PDT)", "from davidp-xps-13.pitowers.org\n\t([2a00:1098:3142:1f:6594:d5bc:c5ae:99b5])\n\tby smtp.gmail.com with ESMTPSA id\n\t5b1f17b1804b1-4408d04802fsm116243185e9.1.2025.04.28.03.36.07\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tMon, 28 Apr 2025 03:36:07 -0700 (PDT)" ], "Authentication-Results": "lancelot.ideasonboard.com; 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\n\tMon, 28 Apr 2025 03:36:07 -0700 (PDT)", "From": "David Plowman <david.plowman@raspberrypi.com>", "To": "libcamera-devel@lists.libcamera.org", "Cc": "David Plowman <david.plowman@raspberrypi.com>", "Subject": "[PATCH 1/2] utils: raspberrypi: ctt: Fix NaNs in lens shading tables", "Date": "Mon, 28 Apr 2025 11:36:03 +0100", "Message-Id": "<20250428103604.151551-2-david.plowman@raspberrypi.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<20250428103604.151551-1-david.plowman@raspberrypi.com>", "References": "<20250428103604.151551-1-david.plowman@raspberrypi.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": "The problem occurs when the calculation could lead to a final row (or\ncolumn) of grid squares with no pixels in them (and hence, NaNs).\n\nOne specific case is a Pi 5 with an image width (or height) of 1364,\nso that's 682 Bayer quads. To give 32 grid squares it was calculating\n22 quads per cell. However, 31 * 22 = 682 leaving nothing in the final\ncolumn.\n\nThe fix is to do a rounding-down division by the number of cells minus\none, rather than a rounding-up division by the number of cells. This\nturns the corner case from one where the final row/column has no\npixels to one where we don't quite cover the full image, which is how\nwe have to handle these cases.\n\nSigned-off-by: David Plowman <david.plowman@raspberrypi.com>\n---\n utils/raspberrypi/ctt/ctt_alsc.py | 7 ++++---\n 1 file changed, 4 insertions(+), 3 deletions(-)", "diff": "diff --git a/utils/raspberrypi/ctt/ctt_alsc.py b/utils/raspberrypi/ctt/ctt_alsc.py\nindex 1d94dfa5..f4fd09e3 100644\n--- a/utils/raspberrypi/ctt/ctt_alsc.py\n+++ b/utils/raspberrypi/ctt/ctt_alsc.py\n@@ -127,11 +127,12 @@ def alsc(Cam, Img, do_alsc_colour, plot=False, grid_size=(16, 12), max_gain=8.0)\n channels = [Img.channels[i] for i in Img.order]\n \"\"\"\n calculate size of single rectangle.\n- -(-(w-1)//32) is a ceiling division. w-1 is to deal robustly with the case\n- where w is a multiple of 32.\n+ The divisions here must ensure the final row/column of cells has a non-zero number of\n+ pixels.\n \"\"\"\n w, h = Img.w/2, Img.h/2\n- dx, dy = int(-(-(w-1)//grid_w)), int(-(-(h-1)//grid_h))\n+ dx, dy = (w - 1) // (grid_w - 1), (h - 1) // (grid_h - 1)\n+\n \"\"\"\n average the green channels into one\n \"\"\"\n", "prefixes": [ "1/2" ] }