From patchwork Mon Nov 8 13:13:34 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: 14475 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 EDB6FC324F for ; Mon, 8 Nov 2021 13:14:09 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 18DB1603D9; Mon, 8 Nov 2021 14:14:08 +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="iVKjn6aF"; dkim-atps=neutral Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 84AEE6032C for ; Mon, 8 Nov 2021 14:14:00 +0100 (CET) Received: from tatooine.ideasonboard.com (unknown [IPv6:2a01:e0a:169:7140:c2bb:76d0:68d7:a9a5]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 43ED51853; Mon, 8 Nov 2021 14:14:00 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1636377240; bh=xYoyXO2xIpO0T3PlvfATsenTDcmVIxKJiA7AEOKpRI8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iVKjn6aFOfPWOkEyr4IEDEb4LSSLt1pmcE/25qsVMOZ4V46RkCbIN+F5eVXHTRf04 ovsaiu3gBLR/jrOKx16JH7riXWoGr+DbU1Fr9zrBSsOM7iXsBPBKVWleetCMn84n9S L3s2ab4Hb9igTyxlGhPNWOrjFZy9LnJABi9JXmkc= From: Jean-Michel Hautbois To: libcamera-devel@lists.libcamera.org Date: Mon, 8 Nov 2021 14:13:34 +0100 Message-Id: <20211108131350.130665-7-jeanmichel.hautbois@ideasonboard.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211108131350.130665-1-jeanmichel.hautbois@ideasonboard.com> References: <20211108131350.130665-1-jeanmichel.hautbois@ideasonboard.com> MIME-Version: 1.0 Subject: [libcamera-devel] [PATCH 06/22] ipa: ipu3: agc: Refactor ev gain calculation and testing 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" When we compute the new gain, we use the iqMean_ and estimate an exposure value gain to apply. Return early when the gain is less than 1%. Signed-off-by: Jean-Michel Hautbois Reviewed-by: Kieran Bingham --- src/ipa/ipu3/algorithms/agc.cpp | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/src/ipa/ipu3/algorithms/agc.cpp b/src/ipa/ipu3/algorithms/agc.cpp index 133f5931..119a7938 100644 --- a/src/ipa/ipu3/algorithms/agc.cpp +++ b/src/ipa/ipu3/algorithms/agc.cpp @@ -189,17 +189,15 @@ void Agc::filterExposure() */ void Agc::computeExposure(uint32_t &exposure, double &analogueGain) { + /* Estimate the gain needed to have the proportion wanted */ + double evGain = kEvGainTarget * knumHistogramBins / iqMean_; - /* Are we correctly exposed ? */ - if (std::abs(iqMean_ - kEvGainTarget * knumHistogramBins) <= 1) { + if (std::abs(evGain - 1.0) < 0.01) { LOG(IPU3Agc, Debug) << "We are well exposed (iqMean = " << iqMean_ << ")"; return; } - /* Estimate the gain needed to have the proportion wanted */ - double evGain = kEvGainTarget * knumHistogramBins / iqMean_; - /* extracted from Rpi::Agc::computeTargetExposure */ /* Calculate the shutter time in seconds */ utils::Duration currentShutter = exposure * lineDuration_;