VelodyneCalibration.cpp

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          http://www.mrpt.org/                          |
   |                                                                        |
   | Copyright (c) 2005-2018, Individual contributors, see AUTHORS file     |
   | See: http://www.mrpt.org/Authors - All rights reserved.                |
   | Released under BSD License. See details in http://www.mrpt.org/License |
   +------------------------------------------------------------------------+ */

#include "obs-precomp.h"  // Precompiled headers

#include <mrpt/obs/VelodyneCalibration.h>
#include <mrpt/core/bits_math.h>
#include <mrpt/core/exceptions.h>
#include <iostream>
#include <map>
#include <cmath>

#undef _UNICODE  // JLBC, for xmlParser
#include "xmlparser/xmlParser.h"

// ======= Default calibration files ========================
#include "velodyne_default_calib_VLP-16.h"
#include "velodyne_default_calib_HDL-32.h"
// ======= End of default calibration files =================

using namespace std;
using namespace mrpt::obs;

VelodyneCalibration::PerLaserCalib::PerLaserCalib()
    : azimuthCorrection(.0),
      verticalCorrection(.0),
      distanceCorrection(.0),
      verticalOffsetCorrection(.0),
      horizontalOffsetCorrection(.0),
      sinVertCorrection(.0),
      cosVertCorrection(1.0),
      sinVertOffsetCorrection(.0),
      cosVertOffsetCorrection(1.0)
{
}

VelodyneCalibration::VelodyneCalibration() : laser_corrections(0) {}
bool VelodyneCalibration::internal_loadFromXMLNode(void* node_ptr)
{
    XMLNode& root = *reinterpret_cast<XMLNode*>(node_ptr);

    XMLNode node_bs = root.getChildNode("boost_serialization");
    if (node_bs.isEmpty())
        throw std::runtime_error("Cannot find XML node: 'boost_serialization'");

    XMLNode node_DB = node_bs.getChildNode("DB");
    if (node_DB.isEmpty())
        throw std::runtime_error("Cannot find XML node: 'DB'");

    XMLNode node_enabled_ = node_DB.getChildNode("enabled_");
    if (node_enabled_.isEmpty())
        throw std::runtime_error("Cannot find XML node: 'enabled_'");

    // Clear previous contents:
    clear();

    XMLNode node_enabled_count = node_enabled_.getChildNode("count");
    if (node_enabled_count.isEmpty())
        throw std::runtime_error("Cannot find XML node: 'enabled_::count'");
    const int nEnabled = atoi(node_enabled_count.getText());
    if (nEnabled <= 0 || nEnabled > 10000)
        throw std::runtime_error(
            "Senseless value found reading 'enabled_::count'");

    int enabledCount = 0;
    for (int i = 0; i < nEnabled; i++)
    {
        XMLNode node_enabled_ith = node_enabled_.getChildNode("item", i);
        if (node_enabled_ith.isEmpty())
            throw std::runtime_error(
                "Cannot find the expected number of XML nodes: "
                "'enabled_::item'");
        const int enable_val = atoi(node_enabled_ith.getText());
        if (enable_val) ++enabledCount;
    }

    // enabledCount = number of lasers in the LIDAR
    this->laser_corrections.resize(enabledCount);

    XMLNode node_points_ = node_DB.getChildNode("points_");
    if (node_points_.isEmpty())
        throw std::runtime_error("Cannot find XML node: 'points_'");

    for (int i = 0;; ++i)
    {
        XMLNode node_points_item = node_points_.getChildNode("item", i);
        if (node_points_item.isEmpty()) break;

        XMLNode node_px = node_points_item.getChildNode("px");
        if (node_px.isEmpty())
            throw std::runtime_error(
                "Cannot find XML node: 'points_::item::px'");

        XMLNode node_px_id = node_px.getChildNode("id_");
        if (node_px_id.isEmpty())
            throw std::runtime_error(
                "Cannot find XML node: 'points_::item::px::id_'");
        const int id = atoi(node_px_id.getText());
        ASSERT_ABOVEEQ_(id, 0);
        if (id >= enabledCount) continue;  // ignore

        PerLaserCalib* plc = &laser_corrections[id];

        {
            XMLNode node = node_px.getChildNode("rotCorrection_");
            if (node.isEmpty())
                throw std::runtime_error(
                    "Cannot find XML node: "
                    "'points_::item::px::rotCorrection_'");
            plc->azimuthCorrection = atof(node.getText());
        }
        {
            XMLNode node = node_px.getChildNode("vertCorrection_");
            if (node.isEmpty())
                throw std::runtime_error(
                    "Cannot find XML node: "
                    "'points_::item::px::vertCorrection_'");
            plc->verticalCorrection = atof(node.getText());
        }
        {
            XMLNode node = node_px.getChildNode("distCorrection_");
            if (node.isEmpty())
                throw std::runtime_error(
                    "Cannot find XML node: "
                    "'points_::item::px::distCorrection_'");
            plc->distanceCorrection = 0.01f * atof(node.getText());
        }
        {
            XMLNode node = node_px.getChildNode("vertOffsetCorrection_");
            if (node.isEmpty())
                throw std::runtime_error(
                    "Cannot find XML node: "
                    "'points_::item::px::vertOffsetCorrection_'");
            plc->verticalOffsetCorrection = 0.01f * atof(node.getText());
        }
        {
            XMLNode node = node_px.getChildNode("horizOffsetCorrection_");
            if (node.isEmpty())
                throw std::runtime_error(
                    "Cannot find XML node: "
                    "'points_::item::px::horizOffsetCorrection_'");
            plc->horizontalOffsetCorrection = 0.01f * atof(node.getText());
        }

        plc->sinVertCorrection =
            std::sin(mrpt::DEG2RAD(plc->verticalCorrection));
        plc->cosVertCorrection =
            std::cos(mrpt::DEG2RAD(plc->verticalCorrection));

        plc->sinVertOffsetCorrection =
            plc->sinVertCorrection * plc->sinVertOffsetCorrection;
        plc->cosVertOffsetCorrection =
            plc->cosVertCorrection * plc->sinVertOffsetCorrection;
    }

    return true;  // Ok
}

bool VelodyneCalibration::loadFromXMLText(const std::string& xml_file_contents)
{
    try
    {
        XMLResults results;
        XMLNode root =
            XMLNode::parseString(xml_file_contents.c_str(), nullptr, &results);

        if (results.error != eXMLErrorNone)
        {
            cerr << "[VelodyneCalibration::loadFromXMLText] Error parsing XML "
                    "content: "
                 << XMLNode::getError(results.error) << " at line "
                 << results.nLine << ":" << results.nColumn << endl;
            return false;
        }

        return internal_loadFromXMLNode(reinterpret_cast<void*>(&root));
    }
    catch (exception& e)
    {
        cerr << "[VelodyneCalibration::loadFromXMLFile] Exception:" << endl
             << e.what() << endl;
        return false;
    }
}

/** Loads calibration from file. \return false on any error, true on success */
// See reference code in:
// vtkVelodyneHDLReader::vtkInternal::LoadCorrectionsFile()
bool VelodyneCalibration::loadFromXMLFile(
    const std::string& velodyne_calibration_xml_filename)
{
    try
    {
        XMLResults results;
        XMLNode root = XMLNode::parseFile(
            velodyne_calibration_xml_filename.c_str(), nullptr, &results);

        if (results.error != eXMLErrorNone)
        {
            cerr << "[VelodyneCalibration::loadFromXMLFile] Error loading XML "
                    "file: "
                 << XMLNode::getError(results.error) << " at line "
                 << results.nLine << ":" << results.nColumn << endl;
            return false;
        }
        return internal_loadFromXMLNode(reinterpret_cast<void*>(&root));
    }
    catch (exception& e)
    {
        cerr << "[VelodyneCalibration::loadFromXMLFile] Exception:" << endl
             << e.what() << endl;
        return false;
    }
}

bool VelodyneCalibration::empty() const { return laser_corrections.empty(); }
void VelodyneCalibration::clear() { laser_corrections.clear(); }
std::map<std::string, VelodyneCalibration> cache_default_calibs;

// It always return a calibration structure, but it may be empty if the model
// name is unknown.
const VelodyneCalibration& VelodyneCalibration::LoadDefaultCalibration(
    const std::string& lidar_model)
{
    // Cached calib data?
    std::map<std::string, VelodyneCalibration>::const_iterator it =
        cache_default_calibs.find(lidar_model);
    if (it != cache_default_calibs.end()) return it->second;

    VelodyneCalibration result;  // Leave empty to indicate unknown model
    std::string xml_contents;

    if (lidar_model == "VLP16")
        xml_contents = velodyne_default_calib_VLP16;
    else if (lidar_model == "HDL32")
        xml_contents = velodyne_default_calib_HDL32;
    else
    {
    }

    if (!xml_contents.empty())
    {
        if (!result.loadFromXMLText(xml_contents))
            std::cerr << "[VelodyneCalibration::LoadDefaultCalibration] Error "
                         "parsing default XML calibration file for model '"
                      << lidar_model << "'\n";
    }

    cache_default_calibs[lidar_model] = result;
    return cache_default_calibs[lidar_model];
}