From patchwork Fri Sep 6 12:09:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Milan Zamazal X-Patchwork-Id: 21188 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 8B3B1BF415 for ; Fri, 6 Sep 2024 12:10:50 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id D2CBE634F7; Fri, 6 Sep 2024 14:10:48 +0200 (CEST) Authentication-Results: lancelot.ideasonboard.com; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.b="NXJaox4F"; dkim-atps=neutral Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 20994634FD for ; Fri, 6 Sep 2024 14:10:31 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1725624629; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=LhPYahubLgT9TeEaeFrjxpAUFrfwXDyiNQQjCtfn0Tc=; b=NXJaox4FjjH0XygBRJ5gzVYeHqvZ83ks/fk0m1avvUSFwIgujasBZCZqwUZbcaTrrFnNGT 5QWiTevaGqRrjdUJDdqNhbDWNWCX+HL9koUzc+D3jdRkQexiIMmZrTI44qQWyUJQqwMg+/ I5ddUXLVEnapfO6TruYifcCndifECTQ= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-288-51D37E-6NS-j2iyGdqHnLg-1; Fri, 06 Sep 2024 08:10:26 -0400 X-MC-Unique: 51D37E-6NS-j2iyGdqHnLg-1 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id AD5CD1955F40; Fri, 6 Sep 2024 12:10:25 +0000 (UTC) Received: from nuthatch.redhat.com (unknown [10.45.224.65]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 946AB1956086; Fri, 6 Sep 2024 12:10:23 +0000 (UTC) From: Milan Zamazal To: libcamera-devel@lists.libcamera.org Cc: Milan Zamazal , Umang Jain , Laurent Pinchart , Daniel Scally Subject: [PATCH v6 15/18] libcamera: software_isp: Use floating point for color parameters Date: Fri, 6 Sep 2024 14:09:24 +0200 Message-ID: <20240906120927.4071508-16-mzamazal@redhat.com> In-Reply-To: <20240906120927.4071508-1-mzamazal@redhat.com> References: <20240906120927.4071508-1-mzamazal@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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" It's more natural to represent color gains and black level as floating point numbers rather than using a particular pixel-related representation. double is used rather than float because it's a more common floating point type in libcamera algorithms. Otherwise there is no obvious reason to select one over the other here. The constructed color tables still use integer representation for efficiency. Signed-off-by: Milan Zamazal Reviewed-by: Kieran Bingham --- src/ipa/simple/algorithms/awb.cpp | 11 +++++------ src/ipa/simple/algorithms/blc.cpp | 8 ++++---- src/ipa/simple/algorithms/lut.cpp | 15 +++++++++------ src/ipa/simple/ipa_context.h | 11 +++++------ 4 files changed, 23 insertions(+), 22 deletions(-) diff --git a/src/ipa/simple/algorithms/awb.cpp b/src/ipa/simple/algorithms/awb.cpp index f89f1d3d..61d9fc73 100644 --- a/src/ipa/simple/algorithms/awb.cpp +++ b/src/ipa/simple/algorithms/awb.cpp @@ -24,7 +24,7 @@ int Awb::init(IPAContext &context, [[maybe_unused]] const YamlObject &tuningData) { auto &gains = context.activeState.gains; - gains.red = gains.green = gains.blue = 256; + gains.red = gains.green = gains.blue = 1.0; return 0; } @@ -36,7 +36,7 @@ void Awb::process(IPAContext &context, [[maybe_unused]] ControlList &metadata) { const SwIspStats::Histogram &histogram = stats->yHistogram; - const uint8_t blackLevel = context.activeState.blc.level; + const double blackLevel = context.activeState.blc.level; /* * Black level must be subtracted to get the correct AWB ratios, they @@ -53,12 +53,11 @@ void Awb::process(IPAContext &context, /* * Calculate red and blue gains for AWB. * Clamp max gain at 4.0, this also avoids 0 division. - * Gain: 128 = 0.5, 256 = 1.0, 512 = 2.0, etc. */ auto &gains = context.activeState.gains; - gains.red = sumR <= sumG / 4 ? 1024 : 256 * sumG / sumR; - gains.blue = sumB <= sumG / 4 ? 1024 : 256 * sumG / sumB; - /* Green gain is fixed to 256 */ + gains.red = sumR <= sumG / 4 ? 4.0 : static_cast(sumG) / sumR; + gains.blue = sumB <= sumG / 4 ? 4.0 : static_cast(sumG) / sumB; + /* Green gain is fixed to 1.0 */ LOG(IPASoftAwb, Debug) << "gain R/B " << gains.red << "/" << gains.blue; } diff --git a/src/ipa/simple/algorithms/blc.cpp b/src/ipa/simple/algorithms/blc.cpp index 08f4345e..1ceae85d 100644 --- a/src/ipa/simple/algorithms/blc.cpp +++ b/src/ipa/simple/algorithms/blc.cpp @@ -24,7 +24,7 @@ BlackLevel::BlackLevel() int BlackLevel::init(IPAContext &context, [[maybe_unused]] const YamlObject &tuningData) { - context.activeState.blc.level = 255; + context.activeState.blc.level = 1.0; return 0; } @@ -44,16 +44,16 @@ void BlackLevel::process(IPAContext &context, const unsigned int total = std::accumulate(begin(histogram), end(histogram), 0); const unsigned int pixelThreshold = ignoredPercentage * total; - const unsigned int histogramRatio = 256 / SwIspStats::kYHistogramSize; const unsigned int currentBlackIdx = - context.activeState.blc.level / histogramRatio; + context.activeState.blc.level * SwIspStats::kYHistogramSize; for (unsigned int i = 0, seen = 0; i < currentBlackIdx && i < SwIspStats::kYHistogramSize; i++) { seen += histogram[i]; if (seen >= pixelThreshold) { - context.activeState.blc.level = i * histogramRatio; + context.activeState.blc.level = + static_cast(i) / SwIspStats::kYHistogramSize; LOG(IPASoftBL, Debug) << "Auto-set black level: " << i << "/" << SwIspStats::kYHistogramSize diff --git a/src/ipa/simple/algorithms/lut.cpp b/src/ipa/simple/algorithms/lut.cpp index 6781f34e..d3b33710 100644 --- a/src/ipa/simple/algorithms/lut.cpp +++ b/src/ipa/simple/algorithms/lut.cpp @@ -32,7 +32,7 @@ void Lut::updateGammaTable(IPAContext &context) { auto &gammaTable = context.activeState.gamma.gammaTable; auto blackLevel = context.activeState.blc.level; - const unsigned int blackIndex = blackLevel * gammaTable.size() / 256; + const unsigned int blackIndex = blackLevel * gammaTable.size(); std::fill(gammaTable.begin(), gammaTable.begin() + blackIndex, 0); const float divisor = gammaTable.size() - blackIndex - 1.0; for (unsigned int i = blackIndex; i < gammaTable.size(); i++) @@ -58,15 +58,18 @@ void Lut::prepare(IPAContext &context, auto &gammaTable = context.activeState.gamma.gammaTable; const unsigned int gammaTableSize = gammaTable.size(); for (unsigned int i = 0; i < DebayerParams::kRGBLookupSize; i++) { - const unsigned int div = static_cast(DebayerParams::kRGBLookupSize) * - 256 / gammaTableSize; + const double div = static_cast(DebayerParams::kRGBLookupSize) / + gammaTableSize; /* Apply gamma after gain! */ unsigned int idx; - idx = std::min({ i * gains.red / div, gammaTableSize - 1 }); + idx = std::min({ static_cast(i * gains.red / div), + gammaTableSize - 1 }); params->red[i] = gammaTable[idx]; - idx = std::min({ i * gains.green / div, gammaTableSize - 1 }); + idx = std::min({ static_cast(i * gains.green / div), + gammaTableSize - 1 }); params->green[i] = gammaTable[idx]; - idx = std::min({ i * gains.blue / div, gammaTableSize - 1 }); + idx = std::min({ static_cast(i * gains.blue / div), + gammaTableSize - 1 }); params->blue[i] = gammaTable[idx]; } } diff --git a/src/ipa/simple/ipa_context.h b/src/ipa/simple/ipa_context.h index 737bbbc3..d09de9a9 100644 --- a/src/ipa/simple/ipa_context.h +++ b/src/ipa/simple/ipa_context.h @@ -8,7 +8,6 @@ #pragma once #include -#include #include @@ -22,19 +21,19 @@ struct IPASessionConfiguration { struct IPAActiveState { struct { - uint8_t level; + double level; } blc; struct { - unsigned int red; - unsigned int green; - unsigned int blue; + double red; + double green; + double blue; } gains; static constexpr unsigned int kGammaLookupSize = 1024; struct { std::array gammaTable; - uint8_t blackLevel; + double blackLevel; } gamma; };