OdometryF2F.cpp

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/*
Copyright (c) 2010-2016, Mathieu Labbe - IntRoLab - Universite de Sherbrooke
All rights reserved.

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      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

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#include "rtabmap/core/odometry/OdometryF2F.h"
#include "rtabmap/core/OdometryInfo.h"
#include "rtabmap/core/Registration.h"
#include "rtabmap/core/EpipolarGeometry.h"
#include "rtabmap/core/util3d_transforms.h"
#include "rtabmap/utilite/ULogger.h"
#include "rtabmap/utilite/UTimer.h"
#include "rtabmap/utilite/UStl.h"

namespace rtabmap {

OdometryF2F::OdometryF2F(const ParametersMap & parameters) :
        Odometry(parameters),
        keyFrameThr_(Parameters::defaultOdomKeyFrameThr()),
        visKeyFrameThr_(Parameters::defaultOdomVisKeyFrameThr()),
        scanKeyFrameThr_(Parameters::defaultOdomScanKeyFrameThr())
{
        registrationPipeline_ = Registration::create(parameters);
        Parameters::parse(parameters, Parameters::kOdomKeyFrameThr(), keyFrameThr_);
        Parameters::parse(parameters, Parameters::kOdomVisKeyFrameThr(), visKeyFrameThr_);
        Parameters::parse(parameters, Parameters::kOdomScanKeyFrameThr(), scanKeyFrameThr_);
        UASSERT(keyFrameThr_>=0.0f && keyFrameThr_<=1.0f);
        UASSERT(visKeyFrameThr_>=0);
        UASSERT(scanKeyFrameThr_>=0.0f && scanKeyFrameThr_<=1.0f);

        parameters_ = parameters;
}

OdometryF2F::~OdometryF2F()
{
        delete registrationPipeline_;
}

void OdometryF2F::reset(const Transform & initialPose)
{
        Odometry::reset(initialPose);
        refFrame_ = Signature();
        lastKeyFramePose_.setNull();
}

// return not null transform if odometry is correctly computed
Transform OdometryF2F::computeTransform(
                SensorData & data,
                const Transform & guess,
                OdometryInfo * info)
{
        UTimer timer;
        Transform output;
        if(!data.rightRaw().empty() && !data.stereoCameraModel().isValidForProjection())
        {
                UERROR("Calibrated stereo camera required");
                return output;
        }
        if(!data.depthRaw().empty() &&
                (data.cameraModels().size() != 1 || !data.cameraModels()[0].isValidForProjection()))
        {
                UERROR("Calibrated camera required (multi-cameras not supported).");
                return output;
        }

        bool addKeyFrame = false;
        RegistrationInfo regInfo;

        UASSERT(!this->getPose().isNull());
        if(lastKeyFramePose_.isNull())
        {
                lastKeyFramePose_ = this->getPose(); // reset to current pose
        }
        Transform motionSinceLastKeyFrame = lastKeyFramePose_.inverse()*this->getPose();

        Signature newFrame(data);
        if(refFrame_.sensorData().isValid())
        {
                float maxCorrespondenceDistance = 0.0f;
                float pmOutlierRatio = 0.0f;
                if(guess.isNull() &&
                        !registrationPipeline_->isImageRequired() &&
                        registrationPipeline_->isScanRequired() &&
                        this->framesProcessed() < 2)
                {
                        // only on initialization (first frame to register), increase icp max correspondences in case the robot is already moving
                        maxCorrespondenceDistance = Parameters::defaultIcpMaxCorrespondenceDistance();
                        pmOutlierRatio = Parameters::defaultIcpPMOutlierRatio();
                        Parameters::parse(parameters_, Parameters::kIcpMaxCorrespondenceDistance(), maxCorrespondenceDistance);
                        Parameters::parse(parameters_, Parameters::kIcpPMOutlierRatio(), pmOutlierRatio);
                        ParametersMap params;
                        params.insert(ParametersPair(Parameters::kIcpMaxCorrespondenceDistance(), uNumber2Str(maxCorrespondenceDistance*3.0f)));
                        params.insert(ParametersPair(Parameters::kIcpPMOutlierRatio(), uNumber2Str(0.95f)));
                        registrationPipeline_->parseParameters(params);
                }

                Signature tmpRefFrame = refFrame_;
                output = registrationPipeline_->computeTransformationMod(
                                tmpRefFrame,
                                newFrame,
                                // special case for ICP-only odom, set guess to identity if we just started or reset
                                !guess.isNull()?motionSinceLastKeyFrame*guess:!registrationPipeline_->isImageRequired()&&this->framesProcessed()<2?motionSinceLastKeyFrame:Transform(),
                                &regInfo);

                if(maxCorrespondenceDistance>0.0f)
                {
                        // set it back
                        ParametersMap params;
                        params.insert(ParametersPair(Parameters::kIcpMaxCorrespondenceDistance(), uNumber2Str(maxCorrespondenceDistance)));
                        params.insert(ParametersPair(Parameters::kIcpPMOutlierRatio(), uNumber2Str(pmOutlierRatio)));
                        registrationPipeline_->parseParameters(params);
                }

                if(output.isNull() && !guess.isNull() && registrationPipeline_->isImageRequired())
                {
                        tmpRefFrame = refFrame_;
                        // reset matches, but keep already extracted features in newFrame.sensorData()
                        newFrame.removeAllWords();
                        UWARN("Failed to find a transformation with the provided guess (%s), trying again without a guess.", guess.prettyPrint().c_str());
                        // If optical flow is used, switch temporary to feature matching
                        int visCorTypeBackup = Parameters::defaultVisCorType();
                        Parameters::parse(parameters_, Parameters::kVisCorType(), visCorTypeBackup);
                        if(visCorTypeBackup == 1)
                        {
                                ParametersMap params;
                                params.insert(ParametersPair(Parameters::kVisCorType(), "0"));
                                registrationPipeline_->parseParameters(params);
                        }

                        output = registrationPipeline_->computeTransformationMod(
                                tmpRefFrame,
                                newFrame,
                                Transform(), // null guess
                                &regInfo);

                        if(visCorTypeBackup == 1)
                        {
                                ParametersMap params;
                                params.insert(ParametersPair(Parameters::kVisCorType(), "1"));
                                registrationPipeline_->parseParameters(params);
                        }

                        if(output.isNull())
                        {
                                UWARN("Trial with no guess still fail.");
                        }
                        else
                        {
                                UWARN("Trial with no guess succeeded.");
                        }
                }

                if(info && this->isInfoDataFilled())
                {
                        std::list<std::pair<int, std::pair<int, int> > > pairs;
                        EpipolarGeometry::findPairsUnique(tmpRefFrame.getWords(), newFrame.getWords(), pairs);
                        info->refCorners.resize(pairs.size());
                        info->newCorners.resize(pairs.size());
                        std::map<int, int> idToIndex;
                        int i=0;
                        for(std::list<std::pair<int, std::pair<int, int> > >::iterator iter=pairs.begin();
                                iter!=pairs.end();
                                ++iter)
                        {
                                info->refCorners[i] = tmpRefFrame.getWordsKpts()[iter->second.first].pt;
                                info->newCorners[i] = newFrame.getWordsKpts()[iter->second.second].pt;
                                idToIndex.insert(std::make_pair(iter->first, i));
                                ++i;
                        }
                        info->cornerInliers.resize(regInfo.inliersIDs.size(), 1);
                        i=0;
                        for(; i<(int)regInfo.inliersIDs.size(); ++i)
                        {
                                info->cornerInliers[i] = idToIndex.at(regInfo.inliersIDs[i]);
                        }

                        Transform t = this->getPose()*motionSinceLastKeyFrame.inverse();
                        if(!tmpRefFrame.getWords3().empty())
                        {
                                for(std::multimap<int, int>::const_iterator iter=tmpRefFrame.getWords().begin(); iter!=tmpRefFrame.getWords().end(); ++iter)
                                {
                                        info->localMap.insert(std::make_pair(iter->first, util3d::transformPoint(tmpRefFrame.getWords3()[iter->second], t)));
                                }
                        }
                        info->localMapSize = tmpRefFrame.getWords3().size();
                        if(!newFrame.getWordsKpts().empty())
                        {
                                for(std::multimap<int, int>::const_iterator iter=newFrame.getWords().begin(); iter!=newFrame.getWords().end(); ++iter)
                                {
                                        info->words.insert(std::make_pair(iter->first, newFrame.getWordsKpts()[iter->second]));
                                }
                        }

                        info->localScanMapSize = tmpRefFrame.sensorData().laserScanRaw().size();

                        info->localScanMap = util3d::transformLaserScan(tmpRefFrame.sensorData().laserScanRaw(), tmpRefFrame.sensorData().laserScanRaw().localTransform().inverse()*t*tmpRefFrame.sensorData().laserScanRaw().localTransform());
                }
        }
        else
        {
                //return Identity
                output = Transform::getIdentity();
                // a very high variance tells that the new pose is not linked with the previous one
                regInfo.covariance = cv::Mat::eye(6,6,CV_64FC1)*9999.0;
        }

        if(!output.isNull())
        {
                output = motionSinceLastKeyFrame.inverse() * output;

                // new key-frame?
                if( (registrationPipeline_->isImageRequired() &&
                                (keyFrameThr_ == 0.0f ||
                                 visKeyFrameThr_ == 0 ||
                                 float(regInfo.inliers) <= keyFrameThr_*float(refFrame_.sensorData().keypoints().size()) ||
                                 regInfo.inliers <= visKeyFrameThr_)) ||
                        (registrationPipeline_->isScanRequired() && (scanKeyFrameThr_ == 0.0f || regInfo.icpInliersRatio <= scanKeyFrameThr_)))
                {
                        UDEBUG("Update key frame");
                        int features = newFrame.getWordsDescriptors().rows;
                        if(registrationPipeline_->isImageRequired() && features == 0)
                        {
                                newFrame = Signature(data);
                                // this will generate features only for the first frame or if optical flow was used (no 3d words)
                                Signature dummy;
                                registrationPipeline_->computeTransformationMod(
                                                newFrame,
                                                dummy);
                                features = (int)newFrame.sensorData().keypoints().size();
                        }

                        if((features >= registrationPipeline_->getMinVisualCorrespondences()) &&
                           (registrationPipeline_->getMinGeometryCorrespondencesRatio()==0.0f ||
                                           (newFrame.sensorData().laserScanRaw().size() &&
                                           (newFrame.sensorData().laserScanRaw().maxPoints() == 0 || float(newFrame.sensorData().laserScanRaw().size())/float(newFrame.sensorData().laserScanRaw().maxPoints())>=registrationPipeline_->getMinGeometryCorrespondencesRatio()))))
                        {
                                refFrame_ = newFrame;

                                refFrame_.removeAllWords();

                                //reset motion
                                lastKeyFramePose_.setNull();

                                addKeyFrame = true;
                        }
                        else
                        {
                                if (!refFrame_.sensorData().isValid())
                                {
                                        // Don't send odometry if we don't have a keyframe yet
                                        output.setNull();
                                }

                                if(features < registrationPipeline_->getMinVisualCorrespondences())
                                {
                                        UWARN("Too low 2D features (%d), keeping last key frame...", features);
                                }

                                if(registrationPipeline_->getMinGeometryCorrespondencesRatio()>0.0f && newFrame.sensorData().laserScanRaw().size()==0)
                                {
                                        UWARN("Too low scan points (%d), keeping last key frame...", newFrame.sensorData().laserScanRaw().size());
                                }
                                else if(registrationPipeline_->getMinGeometryCorrespondencesRatio()>0.0f && newFrame.sensorData().laserScanRaw().maxPoints() != 0 && float(newFrame.sensorData().laserScanRaw().size())/float(newFrame.sensorData().laserScanRaw().maxPoints())<registrationPipeline_->getMinGeometryCorrespondencesRatio())
                                {
                                        UWARN("Too low scan points ratio (%d < %d), keeping last key frame...", float(newFrame.sensorData().laserScanRaw().size())/float(newFrame.sensorData().laserScanRaw().maxPoints()), registrationPipeline_->getMinGeometryCorrespondencesRatio());
                                }
                        }
                }
        }
        else if(!regInfo.rejectedMsg.empty())
        {
                UWARN("Registration failed: \"%s\"", regInfo.rejectedMsg.c_str());
        }

        data.setFeatures(newFrame.sensorData().keypoints(), newFrame.sensorData().keypoints3D(), newFrame.sensorData().descriptors());

        if(info)
        {
                info->type = kTypeF2F;
                info->features = newFrame.sensorData().keypoints().size();
                info->keyFrameAdded = addKeyFrame;
                if(this->isInfoDataFilled())
                {
                        info->reg = regInfo;
                }
                else
                {
                        info->reg = regInfo.copyWithoutData();
                }
        }

        UINFO("Odom update time = %fs lost=%s inliers=%d, ref frame corners=%d, transform accepted=%s",
                        timer.elapsed(),
                        output.isNull()?"true":"false",
                        (int)regInfo.inliers,
                        (int)newFrame.sensorData().keypoints().size(),
                        !output.isNull()?"true":"false");

        return output;
}

} // namespace rtabmap