[{"id":38915,"web_url":"https://patchwork.libcamera.org/comment/38915/","msgid":"","date":"2026-05-18T14:49:07","subject":"Re: [PATCH v1] ipa: rpi: Improve control over which sensor modes\n\trequire \"debinning\"","submitter":{"id":42,"url":"https://patchwork.libcamera.org/api/people/42/","name":"David Plowman","email":"david.plowman@raspberrypi.com"},"content":"A small correction of my own...\n\nOn Mon, 18 May 2026 at 15:26, David Plowman\n wrote:\n>\n> \"Debinning\" is the process that corrects the spatial sampling of\n> pixels when this has been disturbed by the standard binning process.\n>\n> However, debinning is not required for sensors that do it themselves,\n> or for quad Bayer sensors at 2x2 binning where the spatial sampling is\n> already correct.\n>\n> Here we add a getMinDebinFactor() to the CamHelper which allows us to\n> customise at what binning (or downscaling) factor we need to apply the\n> correction. This value is then used to decide whether to enable the\n> relevant PiSP block.\n>\n> Signed-off-by: David Plowman \n> ---\n> src/ipa/rpi/cam_helper/cam_helper.cpp | 6 ++++++\n> src/ipa/rpi/cam_helper/cam_helper.h | 6 ++++++\n> src/ipa/rpi/cam_helper/cam_helper_imx708.cpp | 7 +++++++\n> src/ipa/rpi/pisp/pisp.cpp | 8 +++++---\n> 4 files changed, 24 insertions(+), 3 deletions(-)\n>\n> diff --git a/src/ipa/rpi/cam_helper/cam_helper.cpp b/src/ipa/rpi/cam_helper/cam_helper.cpp\n> index a78db9c1..dfdcd167 100644\n> --- a/src/ipa/rpi/cam_helper/cam_helper.cpp\n> +++ b/src/ipa/rpi/cam_helper/cam_helper.cpp\n> @@ -204,6 +204,12 @@ unsigned int CamHelper::mistrustFramesModeSwitch() const\n> return 0;\n> }\n>\n> +unsigned int CamHelper::getMinDebinFactor() const\n> +{\n> + /* Most cameras require debinning from 2x2 binning upwards. */\n> + return 2;\n> +}\n> +\n> void CamHelper::parseEmbeddedData(Span buffer,\n> Metadata &metadata)\n> {\n> diff --git a/src/ipa/rpi/cam_helper/cam_helper.h b/src/ipa/rpi/cam_helper/cam_helper.h\n> index 4a826690..349891c4 100644\n> --- a/src/ipa/rpi/cam_helper/cam_helper.h\n> +++ b/src/ipa/rpi/cam_helper/cam_helper.h\n> @@ -62,6 +62,11 @@ namespace RPiController {\n> * MistrustFramesModeSwitch(): The number of frames, after a mode switch\n> * (other than start-up), for which control algorithms should not run\n> * (for example, metadata may be unreliable).\n> + * getMinDebinFactor(): the binning factor after which we should apply\n> + * \"debinning\", which corrects for the uneven spatial sampling of the\n> + * standard binning process. A return value of 2 means to enable\n> + * debinning for camera modes using 2x2, or larger, binning. A return\n> + * value of zero means never to enable binning.\n\ns/binning/debinning/\n\n> */\n>\n> class CamHelper\n> @@ -93,6 +98,7 @@ public:\n> virtual unsigned int hideFramesModeSwitch() const;\n> virtual unsigned int mistrustFramesStartup() const;\n> virtual unsigned int mistrustFramesModeSwitch() const;\n> + virtual unsigned int getMinDebinFactor() const;\n>\n> protected:\n> void parseEmbeddedData(libcamera::Span buffer,\n> diff --git a/src/ipa/rpi/cam_helper/cam_helper_imx708.cpp b/src/ipa/rpi/cam_helper/cam_helper_imx708.cpp\n> index 6150909c..e7b8d671 100644\n> --- a/src/ipa/rpi/cam_helper/cam_helper_imx708.cpp\n> +++ b/src/ipa/rpi/cam_helper/cam_helper_imx708.cpp\n> @@ -58,6 +58,7 @@ public:\n> double getModeSensitivity(const CameraMode &mode) const override;\n> unsigned int hideFramesModeSwitch() const override;\n> unsigned int hideFramesStartup() const override;\n> + unsigned int getMinDebinFactor() const override;\n>\n> private:\n> /*\n> @@ -237,6 +238,12 @@ unsigned int CamHelperImx708::hideFramesStartup() const\n> return hideFramesModeSwitch();\n> }\n>\n> +unsigned int CamHelperImx708::getMinDebinFactor() const\n> +{\n> + /* Quad-Bayer sensor, so debinning required only at 4x4 binning. */\n> + return 4;\n> +}\n> +\n> void CamHelperImx708::populateMetadata(const MdParser::RegisterMap ®isters,\n> Metadata &metadata) const\n> {\n> diff --git a/src/ipa/rpi/pisp/pisp.cpp b/src/ipa/rpi/pisp/pisp.cpp\n> index de2a6afe..fd28fc38 100644\n> --- a/src/ipa/rpi/pisp/pisp.cpp\n> +++ b/src/ipa/rpi/pisp/pisp.cpp\n> @@ -1078,12 +1078,14 @@ void IpaPiSP::setStatsAndDebin()\n> pisp_be_global_config beGlobal;\n> be_->GetGlobal(beGlobal);\n>\n> - if (mode_.binX > 1 || mode_.binY > 1) {\n> + unsigned int minDebinFactor = helper_->getMinDebinFactor();\n> + if (minDebinFactor &&\n> + (mode_.binX >= minDebinFactor || mode_.binY >= minDebinFactor)) {\n> pisp_be_debin_config debin;\n>\n> be_->GetDebin(debin);\n> - debin.h_enable = (mode_.binX > 1);\n> - debin.v_enable = (mode_.binY > 1);\n> + debin.h_enable = (mode_.binX >= minDebinFactor);\n> + debin.v_enable = (mode_.binY >= minDebinFactor);\n> be_->SetDebin(debin);\n> beGlobal.bayer_enables |= PISP_BE_BAYER_ENABLE_DEBIN;\n> } else\n> --\n> 2.47.3\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 8E2C3BDCBC\n\tfor ;\n\tMon, 18 May 2026 14:49:23 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id C872E62FEC;\n\tMon, 18 May 2026 16:49:21 +0200 (CEST)","from mail-ed1-x536.google.com (mail-ed1-x536.google.com\n\t[IPv6:2a00:1450:4864:20::536])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 8D9BA62FB1\n\tfor ;\n\tMon, 18 May 2026 16:49:19 +0200 (CEST)","by mail-ed1-x536.google.com with SMTP id\n\t4fb4d7f45d1cf-6804e24803bso5415228a12.1\n\tfor ;\n\tMon, 18 May 2026 07:49:19 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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charset=\"UTF-8\"","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":38944,"web_url":"https://patchwork.libcamera.org/comment/38944/","msgid":"","date":"2026-05-22T10:46:35","subject":"Re: [PATCH v1] ipa: rpi: Improve control over which sensor modes\n\trequire \"debinning\"","submitter":{"id":130,"url":"https://patchwork.libcamera.org/api/people/130/","name":"Nick Hollinghurst","email":"nick.hollinghurst@raspberrypi.com"},"content":"Hi David,\n\nThanks for the patch.\nI have tested it with a Raspberry Pi 5 and IMX708 (Quad Bayer) camera\nwith the following:\n~/rpicam-apps/build/apps/rpicam-still --mode 2304:1296 -n -o tmp1.jpg\nThere is a visible improvement with the change, it reduces blockiness\nand ringing artifacts.\n\nTested-by: Nick Hollinghurst \n\n\n Nick\n\nOn Mon, 18 May 2026 at 15:49, David Plowman\n wrote:\n>\n> A small correction of my own...\n>\n> On Mon, 18 May 2026 at 15:26, David Plowman\n> wrote:\n> >\n> > \"Debinning\" is the process that corrects the spatial sampling of\n> > pixels when this has been disturbed by the standard binning process.\n> >\n> > However, debinning is not required for sensors that do it themselves,\n> > or for quad Bayer sensors at 2x2 binning where the spatial sampling is\n> > already correct.\n> >\n> > Here we add a getMinDebinFactor() to the CamHelper which allows us to\n> > customise at what binning (or downscaling) factor we need to apply the\n> > correction. This value is then used to decide whether to enable the\n> > relevant PiSP block.\n> >\n> > Signed-off-by: David Plowman \n> > ---\n> > src/ipa/rpi/cam_helper/cam_helper.cpp | 6 ++++++\n> > src/ipa/rpi/cam_helper/cam_helper.h | 6 ++++++\n> > src/ipa/rpi/cam_helper/cam_helper_imx708.cpp | 7 +++++++\n> > src/ipa/rpi/pisp/pisp.cpp | 8 +++++---\n> > 4 files changed, 24 insertions(+), 3 deletions(-)\n> >\n> > diff --git a/src/ipa/rpi/cam_helper/cam_helper.cpp b/src/ipa/rpi/cam_helper/cam_helper.cpp\n> > index a78db9c1..dfdcd167 100644\n> > --- a/src/ipa/rpi/cam_helper/cam_helper.cpp\n> > +++ b/src/ipa/rpi/cam_helper/cam_helper.cpp\n> > @@ -204,6 +204,12 @@ unsigned int CamHelper::mistrustFramesModeSwitch() const\n> > return 0;\n> > }\n> >\n> > +unsigned int CamHelper::getMinDebinFactor() const\n> > +{\n> > + /* Most cameras require debinning from 2x2 binning upwards. */\n> > + return 2;\n> > +}\n> > +\n> > void CamHelper::parseEmbeddedData(Span buffer,\n> > Metadata &metadata)\n> > {\n> > diff --git a/src/ipa/rpi/cam_helper/cam_helper.h b/src/ipa/rpi/cam_helper/cam_helper.h\n> > index 4a826690..349891c4 100644\n> > --- a/src/ipa/rpi/cam_helper/cam_helper.h\n> > +++ b/src/ipa/rpi/cam_helper/cam_helper.h\n> > @@ -62,6 +62,11 @@ namespace RPiController {\n> > * MistrustFramesModeSwitch(): The number of frames, after a mode switch\n> > * (other than start-up), for which control algorithms should not run\n> > * (for example, metadata may be unreliable).\n> > + * getMinDebinFactor(): the binning factor after which we should apply\n> > + * \"debinning\", which corrects for the uneven spatial sampling of the\n> > + * standard binning process. A return value of 2 means to enable\n> > + * debinning for camera modes using 2x2, or larger, binning. A return\n> > + * value of zero means never to enable binning.\n>\n> s/binning/debinning/\n>\n> > */\n> >\n> > class CamHelper\n> > @@ -93,6 +98,7 @@ public:\n> > virtual unsigned int hideFramesModeSwitch() const;\n> > virtual unsigned int mistrustFramesStartup() const;\n> > virtual unsigned int mistrustFramesModeSwitch() const;\n> > + virtual unsigned int getMinDebinFactor() const;\n> >\n> > protected:\n> > void parseEmbeddedData(libcamera::Span buffer,\n> > diff --git a/src/ipa/rpi/cam_helper/cam_helper_imx708.cpp b/src/ipa/rpi/cam_helper/cam_helper_imx708.cpp\n> > index 6150909c..e7b8d671 100644\n> > --- a/src/ipa/rpi/cam_helper/cam_helper_imx708.cpp\n> > +++ b/src/ipa/rpi/cam_helper/cam_helper_imx708.cpp\n> > @@ -58,6 +58,7 @@ public:\n> > double getModeSensitivity(const CameraMode &mode) const override;\n> > unsigned int hideFramesModeSwitch() const override;\n> > unsigned int hideFramesStartup() const override;\n> > + unsigned int getMinDebinFactor() const override;\n> >\n> > private:\n> > /*\n> > @@ -237,6 +238,12 @@ unsigned int CamHelperImx708::hideFramesStartup() const\n> > return hideFramesModeSwitch();\n> > }\n> >\n> > +unsigned int CamHelperImx708::getMinDebinFactor() const\n> > +{\n> > + /* Quad-Bayer sensor, so debinning required only at 4x4 binning. */\n> > + return 4;\n> > +}\n> > +\n> > void CamHelperImx708::populateMetadata(const MdParser::RegisterMap ®isters,\n> > Metadata &metadata) const\n> > {\n> > diff --git a/src/ipa/rpi/pisp/pisp.cpp b/src/ipa/rpi/pisp/pisp.cpp\n> > index de2a6afe..fd28fc38 100644\n> > --- a/src/ipa/rpi/pisp/pisp.cpp\n> > +++ b/src/ipa/rpi/pisp/pisp.cpp\n> > @@ -1078,12 +1078,14 @@ void IpaPiSP::setStatsAndDebin()\n> > pisp_be_global_config beGlobal;\n> > be_->GetGlobal(beGlobal);\n> >\n> > - if (mode_.binX > 1 || mode_.binY > 1) {\n> > + unsigned int minDebinFactor = helper_->getMinDebinFactor();\n> > + if (minDebinFactor &&\n> > + (mode_.binX >= minDebinFactor || mode_.binY >= minDebinFactor)) {\n> > pisp_be_debin_config debin;\n> >\n> > be_->GetDebin(debin);\n> > - debin.h_enable = (mode_.binX > 1);\n> > - debin.v_enable = (mode_.binY > 1);\n> > + debin.h_enable = (mode_.binX >= minDebinFactor);\n> > + debin.v_enable = (mode_.binY >= minDebinFactor);\n> > be_->SetDebin(debin);\n> > beGlobal.bayer_enables |= PISP_BE_BAYER_ENABLE_DEBIN;\n> > } else\n> > --\n> > 2.47.3\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 0B9C7BDCBD\n\tfor ;\n\tFri, 22 May 2026 10:46:51 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id A58A162FEC;\n\tFri, 22 May 2026 12:46:49 +0200 (CEST)","from mail-ot1-x32c.google.com (mail-ot1-x32c.google.com\n\t[IPv6:2607:f8b0:4864:20::32c])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id EDEBA62DC4\n\tfor ;\n\tFri, 22 May 2026 12:46:47 +0200 (CEST)","by mail-ot1-x32c.google.com with SMTP id\n\t46e09a7af769-7e5fd39cf11so831026a34.0\n\tfor ;\n\tFri, 22 May 2026 03:46:47 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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