[{"id":35291,"web_url":"https://patchwork.libcamera.org/comment/35291/","msgid":"<175450194618.50296.11285851998507361575@ping.linuxembedded.co.uk>","date":"2025-08-06T17:39:06","subject":"Re: [PATCH v2 2/2] libcamera: software_isp: Reduce statistics image\n\tarea","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Quoting Milan Zamazal (2025-07-24 16:29:36)\n> The statistics in software ISP is computed basically over the whole\n> image area, although only on part of the pixels. It is not necessary to\n> cover the whole image area, it's sufficient to compute the statistics\n> let's say over the central area of 2/3 of the image width and height,\n> which should be both sufficient and faster. The speedup is not that\n> important with the CPU implementation but it may save CPU work\n> more noticeably with GPU debayering implementation.\n> \n> Signed-off-by: Milan Zamazal \n> ---\n> src/libcamera/software_isp/debayer_cpu.cpp | 2 +-\n> src/libcamera/software_isp/debayer_egl.cpp | 7 +++++--\n> 2 files changed, 6 insertions(+), 3 deletions(-)\n> \n> diff --git a/src/libcamera/software_isp/debayer_cpu.cpp b/src/libcamera/software_isp/debayer_cpu.cpp\n> index e56492848..bea153592 100644\n> --- a/src/libcamera/software_isp/debayer_cpu.cpp\n> +++ b/src/libcamera/software_isp/debayer_cpu.cpp\n> @@ -526,7 +526,7 @@ int DebayerCpu::configure(const StreamConfiguration &inputCfg,\n> window_.width = outputCfg.size.width;\n> window_.height = outputCfg.size.height;\n> \n> - /* Don't pass x,y since process() already adjusts src before passing it */\n> + /* Don't pass x,y from window_ since process() already adjusts for it. */\n> stats_->setWindow(Rectangle(window_.size()));\n\nShouldn't we do the same on both to have the same behaviour ?\n\nIdeally this should (later) be configurable and could even map to the Ae\ncontrols for CenterWeighted, Spot or Matrix metering ?\n\n> \n> /* pad with patternSize.Width on both left and right side */\n> diff --git a/src/libcamera/software_isp/debayer_egl.cpp b/src/libcamera/software_isp/debayer_egl.cpp\n> index 9ec966608..9ad7d6fe7 100644\n> --- a/src/libcamera/software_isp/debayer_egl.cpp\n> +++ b/src/libcamera/software_isp/debayer_egl.cpp\n> @@ -393,8 +393,11 @@ int DebayerEGL::configure(const StreamConfiguration &inputCfg,\n> window_.width = outputCfg.size.width;\n> window_.height = outputCfg.size.height;\n> \n> - /* Don't pass x,y since process() already adjusts src before passing it */\n> - stats_->setWindow(Rectangle(window_.size()));\n> + /*\n> + * Don't pass x,y from window_ since process() already adjusts for it.\n> + * But crop the window to 2/3 of its width and height for speedup.\n> + */\n> + stats_->setWindow(Rectangle(window_.size()).croppedBy(2, 3));\n\nI think this is reasonable for the moment though as an optimisation.\nIt's almost 'CenterWeighted' but not actually weighting ...\n\n> LOG(Debayer, Debug) << \"Input width \" << inputCfg.size.width << \" height \" << inputCfg.size.height;\n> LOG(Debayer, Debug) << \"Output width \" << outputCfg.size.width << \" height \" << outputCfg.size.height;\n> -- \n> 2.50.1\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 67AF9BDCC1\n\tfor ;\n\tWed, 6 Aug 2025 17:39:12 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 5B3316921E;\n\tWed, 6 Aug 2025 19:39:11 +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 922BA691F5\n\tfor ;\n\tWed, 6 Aug 2025 19:39:09 +0200 (CEST)","from pendragon.ideasonboard.com\n\t(cpc89244-aztw30-2-0-cust6594.18-1.cable.virginm.net [86.31.185.195])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id E6DB0EBA;\n\tWed, 6 Aug 2025 19:38:20 +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=\"ZmJ6LLiq\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1754501901;\n\tbh=CYHiXsu3o9pMX/15VGWn9xh4VMhuzEZFo67V2iSBpjs=;\n\th=In-Reply-To:References:Subject:From:Cc:To:Date:From;\n\tb=ZmJ6LLiqyi/FpUAZ5y4zSLsARKmiCNC+s+fW9bj4nZHDFyOJ4+0IR5WmHYYy568Im\n\tnhDIcF3Q/dNfaK1RDmMiBvQkCz7M2FeJX2QY94l0TtyrCaxLYJmpRk57EsETRKG2f3\n\txGkbbQ+rIFRv/cuEzNRftGnDmQ2/hdrv9q3SmkA0=","Content-Type":"text/plain; charset=\"utf-8\"","MIME-Version":"1.0","Content-Transfer-Encoding":"quoted-printable","In-Reply-To":"<20250724152936.99830-3-mzamazal@redhat.com>","References":"<20250724152936.99830-1-mzamazal@redhat.com>\n\t<20250724152936.99830-3-mzamazal@redhat.com>","Subject":"Re: [PATCH v2 2/2] libcamera: software_isp: Reduce statistics image\n\tarea","From":"Kieran Bingham ","Cc":"Milan Zamazal ","To":"Milan Zamazal , libcamera-devel@lists.libcamera.org","Date":"Wed, 06 Aug 2025 18:39:06 +0100","Message-ID":"<175450194618.50296.11285851998507361575@ping.linuxembedded.co.uk>","User-Agent":"alot/0.9.1","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":35312,"web_url":"https://patchwork.libcamera.org/comment/35312/","msgid":"<175465290674.560048.16496122976224054634@ping.linuxembedded.co.uk>","date":"2025-08-08T11:35:06","subject":"Re: [PATCH v2 2/2] libcamera: software_isp: Reduce statistics image\n\tarea","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Quoting Kieran Bingham (2025-08-06 18:39:06)\n> Quoting Milan Zamazal (2025-07-24 16:29:36)\n> > The statistics in software ISP is computed basically over the whole\n> > image area, although only on part of the pixels. It is not necessary to\n> > cover the whole image area, it's sufficient to compute the statistics\n> > let's say over the central area of 2/3 of the image width and height,\n> > which should be both sufficient and faster. The speedup is not that\n> > important with the CPU implementation but it may save CPU work\n> > more noticeably with GPU debayering implementation.\n> > \n> > Signed-off-by: Milan Zamazal \n> > ---\n> > src/libcamera/software_isp/debayer_cpu.cpp | 2 +-\n> > src/libcamera/software_isp/debayer_egl.cpp | 7 +++++--\n> > 2 files changed, 6 insertions(+), 3 deletions(-)\n> > \n> > diff --git a/src/libcamera/software_isp/debayer_cpu.cpp b/src/libcamera/software_isp/debayer_cpu.cpp\n> > index e56492848..bea153592 100644\n> > --- a/src/libcamera/software_isp/debayer_cpu.cpp\n> > +++ b/src/libcamera/software_isp/debayer_cpu.cpp\n> > @@ -526,7 +526,7 @@ int DebayerCpu::configure(const StreamConfiguration &inputCfg,\n> > window_.width = outputCfg.size.width;\n> > window_.height = outputCfg.size.height;\n> > \n> > - /* Don't pass x,y since process() already adjusts src before passing it */\n> > + /* Don't pass x,y from window_ since process() already adjusts for it. */\n> > stats_->setWindow(Rectangle(window_.size()));\n> \n> Shouldn't we do the same on both to have the same behaviour ?\n> \n> Ideally this should (later) be configurable and could even map to the Ae\n> controls for CenterWeighted, Spot or Matrix metering ?\n> \n> > \n> > /* pad with patternSize.Width on both left and right side */\n> > diff --git a/src/libcamera/software_isp/debayer_egl.cpp b/src/libcamera/software_isp/debayer_egl.cpp\n> > index 9ec966608..9ad7d6fe7 100644\n> > --- a/src/libcamera/software_isp/debayer_egl.cpp\n> > +++ b/src/libcamera/software_isp/debayer_egl.cpp\n> > @@ -393,8 +393,11 @@ int DebayerEGL::configure(const StreamConfiguration &inputCfg,\n> > window_.width = outputCfg.size.width;\n> > window_.height = outputCfg.size.height;\n> > \n> > - /* Don't pass x,y since process() already adjusts src before passing it */\n> > - stats_->setWindow(Rectangle(window_.size()));\n> > + /*\n> > + * Don't pass x,y from window_ since process() already adjusts for it.\n> > + * But crop the window to 2/3 of its width and height for speedup.\n> > + */\n\nReading the proposal in the first patch - this does look good:\n\n\tstats_->setWindow((window_.size() * 0.66).centeredTo(window_.center());\n\nor even\n\n\tstats_->setWindow((window_.size() * 2 / 3).centeredTo(window_.center());\n\nand tells me all the information I needed before. I can read instantly\nthat it's centered into the window_.center and it's 0.66 of the current\nwindow_.size() which I think is nicer than casting to an intermeddiate\nRectangle() just to initialise.\n\n\n\n> > + stats_->setWindow(Rectangle(window_.size()).croppedBy(2, 3));\n> \n> I think this is reasonable for the moment though as an optimisation.\n> It's almost 'CenterWeighted' but not actually weighting ...\n> \n> > LOG(Debayer, Debug) << \"Input width \" << inputCfg.size.width << \" height \" << inputCfg.size.height;\n> > LOG(Debayer, Debug) << \"Output width \" << outputCfg.size.width << \" height \" << outputCfg.size.height;\n> > -- \n> > 2.50.1\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 E67BFBEFBE\n\tfor ;\n\tFri, 8 Aug 2025 11:35:11 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id B2CEE6921E;\n\tFri, 8 Aug 2025 13:35:10 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 4C4796084D\n\tfor ;\n\tFri, 8 Aug 2025 13:35:09 +0200 (CEST)","from pendragon.ideasonboard.com\n\t(cpc89244-aztw30-2-0-cust6594.18-1.cable.virginm.net [86.31.185.195])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 6B19E16B8;\n\tFri, 8 Aug 2025 13:34:19 +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=\"dHxy4jEp\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1754652859;\n\tbh=otYwC1wm7g7sXpi4W9RtGqZVmzi8SLnH+G11AjipyuA=;\n\th=In-Reply-To:References:Subject:From:Cc:To:Date:From;\n\tb=dHxy4jEpp/1wj3RZHM2ZKl6d+rcpb+YJ0NKJWvkLqoGJdNA0wGeuJJTWt0agfkuip\n\tMfJNOyZ964Q7nSGqbCY56HDtjUY5BgMkDCs71oz0UxSQQHi9OdavJp43/+IZqz0+30\n\tJe/8k4UEKtLw0rp4RjB4RX8yB8M9SZw5K6zYM7Aw=","Content-Type":"text/plain; charset=\"utf-8\"","MIME-Version":"1.0","Content-Transfer-Encoding":"quoted-printable","In-Reply-To":"<175450194618.50296.11285851998507361575@ping.linuxembedded.co.uk>","References":"<20250724152936.99830-1-mzamazal@redhat.com>\n\t<20250724152936.99830-3-mzamazal@redhat.com>\n\t<175450194618.50296.11285851998507361575@ping.linuxembedded.co.uk>","Subject":"Re: [PATCH v2 2/2] libcamera: software_isp: Reduce statistics image\n\tarea","From":"Kieran Bingham ","Cc":"Milan Zamazal ","To":"Milan Zamazal , libcamera-devel@lists.libcamera.org","Date":"Fri, 08 Aug 2025 12:35:06 +0100","Message-ID":"<175465290674.560048.16496122976224054634@ping.linuxembedded.co.uk>","User-Agent":"alot/0.9.1","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":35389,"web_url":"https://patchwork.libcamera.org/comment/35389/","msgid":"<85sehvxii2.fsf@mzamazal-thinkpadp1gen7.tpbc.csb>","date":"2025-08-13T17:02:13","subject":"Re: [PATCH v2 2/2] libcamera: software_isp: Reduce statistics image\n\tarea","submitter":{"id":177,"url":"https://patchwork.libcamera.org/api/people/177/","name":"Milan Zamazal","email":"mzamazal@redhat.com"},"content":"Hi,\n\nthank you all for reviews.\n\nKieran Bingham writes:\n\n> Quoting Milan Zamazal (2025-07-24 16:29:36)\n>> The statistics in software ISP is computed basically over the whole\n>> image area, although only on part of the pixels. It is not necessary to\n>\n>> cover the whole image area, it's sufficient to compute the statistics\n>> let's say over the central area of 2/3 of the image width and height,\n>> which should be both sufficient and faster. The speedup is not that\n>> important with the CPU implementation but it may save CPU work\n>> more noticeably with GPU debayering implementation.\n>> \n>> Signed-off-by: Milan Zamazal \n>> ---\n>> src/libcamera/software_isp/debayer_cpu.cpp | 2 +-\n>> src/libcamera/software_isp/debayer_egl.cpp | 7 +++++--\n>> 2 files changed, 6 insertions(+), 3 deletions(-)\n>> \n>> diff --git a/src/libcamera/software_isp/debayer_cpu.cpp b/src/libcamera/software_isp/debayer_cpu.cpp\n>> index e56492848..bea153592 100644\n>> --- a/src/libcamera/software_isp/debayer_cpu.cpp\n>> +++ b/src/libcamera/software_isp/debayer_cpu.cpp\n>> @@ -526,7 +526,7 @@ int DebayerCpu::configure(const StreamConfiguration &inputCfg,\n>> window_.width = outputCfg.size.width;\n>> window_.height = outputCfg.size.height;\n>> \n>> - /* Don't pass x,y since process() already adjusts src before passing it */\n>> + /* Don't pass x,y from window_ since process() already adjusts for it. */\n>> stats_->setWindow(Rectangle(window_.size()));\n>\n> Shouldn't we do the same on both to have the same behaviour ?\n\nYes, it would be better for consistency.\n\n> Ideally this should (later) be configurable and could even map to the Ae\n> controls for CenterWeighted, Spot or Matrix metering ?\n\nMaybe and there should be a common method. Not necessary now, I think.\n\n>> > \n>> > /* pad with patternSize.Width on both left and right side */\n>> > diff --git a/src/libcamera/software_isp/debayer_egl.cpp b/src/libcamera/software_isp/debayer_egl.cpp\n>> > index 9ec966608..9ad7d6fe7 100644\n>> > --- a/src/libcamera/software_isp/debayer_egl.cpp\n>> > +++ b/src/libcamera/software_isp/debayer_egl.cpp\n>> > @@ -393,8 +393,11 @@ int DebayerEGL::configure(const StreamConfiguration &inputCfg,\n>> > window_.width = outputCfg.size.width;\n>> > window_.height = outputCfg.size.height;\n>> > \n>> > - /* Don't pass x,y since process() already adjusts src before passing it */\n>> > - stats_->setWindow(Rectangle(window_.size()));\n>> > + /*\n>> > + * Don't pass x,y from window_ since process() already adjusts for it.\n>> > + * But crop the window to 2/3 of its width and height for speedup.\n>> > + */\n>\n> Reading the proposal in the first patch - this does look good:\n>\n> \tstats_->setWindow((window_.size() * 0.66).centeredTo(window_.center());\n>\n> or even\n>\n> \tstats_->setWindow((window_.size() * 2 / 3).centeredTo(window_.center());\n\nLooks good to me, I use it in v3.\n\n> and tells me all the information I needed before. I can read instantly\n> that it's centered into the window_.center and it's 0.66 of the current\n> window_.size() which I think is nicer than casting to an intermeddiate\n> Rectangle() just to initialise.\n>\n>\n>\n>> > + stats_->setWindow(Rectangle(window_.size()).croppedBy(2, 3));\n>> \n>> I think this is reasonable for the moment though as an optimisation.\n>> It's almost 'CenterWeighted' but not actually weighting ...\n>> \n>> > LOG(Debayer, Debug) << \"Input width \" << inputCfg.size.width << \" height \" <<\n>> > inputCfg.size.height;\n>> > LOG(Debayer, Debug) << \"Output width \" << outputCfg.size.width << \" height \" <<\n>> > outputCfg.size.height;\n>> > -- \n>> > 2.50.1\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 9CF5CBDCC1\n\tfor ;\n\tWed, 13 Aug 2025 17:02:24 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 6DA2569251;\n\tWed, 13 Aug 2025 19:02:23 +0200 (CEST)","from us-smtp-delivery-124.mimecast.com\n\t(us-smtp-delivery-124.mimecast.com [170.10.133.124])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 764A46922C\n\tfor ;\n\tWed, 13 Aug 2025 19:02:20 +0200 (CEST)","from mail-qt1-f197.google.com (mail-qt1-f197.google.com\n\t[209.85.160.197]) by relay.mimecast.com with ESMTP with STARTTLS\n\t(version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id\n\tus-mta-608-rQDuN_60Pd2NUgPCb_bPXQ-1; Wed, 13 Aug 2025 13:02:17 -0400","by mail-qt1-f197.google.com with SMTP id\n\td75a77b69052e-4b1099142e0so2416841cf.0\n\tfor ;\n\tWed, 13 Aug 2025 10:02:17 -0700 (PDT)","from mzamazal-thinkpadp1gen7.tpbc.csb\n\t(ip-77-48-47-2.net.vodafone.cz. 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