From patchwork Thu Nov 11 14:09:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Michel Hautbois X-Patchwork-Id: 14577 Return-Path: X-Original-To: parsemail@patchwork.libcamera.org Delivered-To: parsemail@patchwork.libcamera.org Received: from lancelot.ideasonboard.com (lancelot.ideasonboard.com [92.243.16.209]) by patchwork.libcamera.org (Postfix) with ESMTPS id 21388C324E for ; Thu, 11 Nov 2021 14:09:42 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 8ED9760423; Thu, 11 Nov 2021 15:09:41 +0100 (CET) Authentication-Results: lancelot.ideasonboard.com; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="WsF34VAD"; dkim-atps=neutral Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id B620360371 for ; Thu, 11 Nov 2021 15:09:32 +0100 (CET) Received: from tatooine.ideasonboard.com (unknown [IPv6:2a01:e0a:169:7140:e627:8337:a781:d98]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 79032DEE; Thu, 11 Nov 2021 15:09:32 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1636639772; bh=xg9dwKCABj8ypq5L89gja33/nZOvu25bnOUjVpDgLFg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WsF34VADs44xO42260JsSw2OskVLD0jXZ/DKJAcHONyO3gs9N87yrYWUwW4A3JBZf lPRopfrzYe+19CZBqWdFf0wcJlb3agN3Ns9AYouvvlbfpEiK1LKdYDYHsqcg/uD9XN BOX/gXRvoFbhSd/IUyGlAD3E5dEAV2eVnKattz4U= From: Jean-Michel Hautbois To: libcamera-devel@lists.libcamera.org Date: Thu, 11 Nov 2021 15:09:22 +0100 Message-Id: <20211111140928.136111-9-jeanmichel.hautbois@ideasonboard.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211111140928.136111-1-jeanmichel.hautbois@ideasonboard.com> References: <20211111140928.136111-1-jeanmichel.hautbois@ideasonboard.com> MIME-Version: 1.0 Subject: [libcamera-devel] [PATCH v4 08/14] ipa: ipu3: agc: Update previous exposure value X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libcamera-devel-bounces@lists.libcamera.org Sender: "libcamera-devel" Previously, the exposure value was calculated based on the estimated shutter time and gain applied. Now that we have the real values for the current frame, use those before estimating the next one and rename the variable accordingly. As the exposure value is updated in the beginning of the computation, there is no need to initialize effectiveExposureValue anymore in the configure call, and it can be a local variable and not a class variable anymore. Signed-off-by: Jean-Michel Hautbois Reviewed-by: Kieran Bingham Reviewed-by: Umang Jain Reviewed-by: Paul Elder --- v3: make effectiveExposureValue a local variable --- src/ipa/ipu3/algorithms/agc.cpp | 26 +++++++++----------------- src/ipa/ipu3/algorithms/agc.h | 1 - 2 files changed, 9 insertions(+), 18 deletions(-) diff --git a/src/ipa/ipu3/algorithms/agc.cpp b/src/ipa/ipu3/algorithms/agc.cpp index a34f070e..d736f21c 100644 --- a/src/ipa/ipu3/algorithms/agc.cpp +++ b/src/ipa/ipu3/algorithms/agc.cpp @@ -80,8 +80,7 @@ static constexpr double kNormalizedLumaTarget = 0.16; Agc::Agc() : frameCount_(0), iqMean_(0.0), lineDuration_(0s), minExposureLines_(0), - maxExposureLines_(0), filteredExposure_(0s), currentExposure_(0s), - prevExposureValue_(0s) + maxExposureLines_(0), filteredExposure_(0s), currentExposure_(0s) { } @@ -112,10 +111,6 @@ int Agc::configure(IPAContext &context, const IPAConfigInfo &configInfo) context.frameContext.agc.gain = minAnalogueGain_; context.frameContext.agc.exposure = minExposureLines_; - prevExposureValue_ = context.frameContext.agc.gain - * context.frameContext.agc.exposure - * lineDuration_; - return 0; } @@ -222,6 +217,13 @@ void Agc::computeExposure(IPAFrameContext &frameContext, double currentYGain) /* Calculate the shutter time in seconds */ utils::Duration currentShutter = exposure * lineDuration_; + + /* + * Update the exposure value for the next computation using the values + * of exposure and gain really used by the sensor. + */ + utils::Duration effectiveExposureValue = currentShutter * analogueGain; + LOG(IPU3Agc, Debug) << "Actual total exposure " << currentShutter * analogueGain << " Shutter speed " << currentShutter << " Gain " << analogueGain @@ -239,7 +241,7 @@ void Agc::computeExposure(IPAFrameContext &frameContext, double currentYGain) * Calculate the current exposure value for the scene as the latest * exposure value applied multiplied by the new estimated gain. */ - currentExposure_ = prevExposureValue_ * evGain; + currentExposure_ = effectiveExposureValue * evGain; utils::Duration minShutterSpeed = minExposureLines_ * lineDuration_; utils::Duration maxShutterSpeed = maxExposureLines_ * lineDuration_; @@ -271,16 +273,6 @@ void Agc::computeExposure(IPAFrameContext &frameContext, double currentYGain) /* Update the estimated exposure and gain. */ frameContext.agc.exposure = shutterTime / lineDuration_; frameContext.agc.gain = stepGain; - - /* - * Update the exposure value for the next process call. - * - * \todo Obtain the values of the exposure time and analog gain - * that were actually used by the sensor, either from embedded - * data when available, or from the delayed controls - * infrastructure in case a slow down caused a mismatch. - */ - prevExposureValue_ = shutterTime * analogueGain; } /** diff --git a/src/ipa/ipu3/algorithms/agc.h b/src/ipa/ipu3/algorithms/agc.h index 79736283..1d085b40 100644 --- a/src/ipa/ipu3/algorithms/agc.h +++ b/src/ipa/ipu3/algorithms/agc.h @@ -54,7 +54,6 @@ private: utils::Duration filteredExposure_; utils::Duration currentExposure_; - utils::Duration prevExposureValue_; uint32_t stride_; };