From 5a25f2ba1c1e7fbe6d3c0cd18654e04b1b4838e6 Mon Sep 17 00:00:00 2001
From: Nicolas Pope <nwpope@utu.fi>
Date: Mon, 11 Mar 2019 14:26:41 +0200
Subject: [PATCH] Initial version of cv-node which should read stereo videos
---
cv-node/CMakeLists.txt | 62 +++
cv-node/config/in_VID5.xml | 59 +++
cv-node/include/ftl/calibrate.hpp | 29 ++
cv-node/include/ftl/local.hpp | 38 ++
cv-node/include/ftl/synched.hpp | 28 ++
cv-node/src/calibrate.cpp | 752 ++++++++++++++++++++++++++++++
cv-node/src/local.cpp | 118 +++++
cv-node/src/main.cpp | 103 ++++
cv-node/src/sync.cpp | 29 ++
9 files changed, 1218 insertions(+)
create mode 100644 cv-node/CMakeLists.txt
create mode 100644 cv-node/config/in_VID5.xml
create mode 100644 cv-node/include/ftl/calibrate.hpp
create mode 100644 cv-node/include/ftl/local.hpp
create mode 100644 cv-node/include/ftl/synched.hpp
create mode 100644 cv-node/src/calibrate.cpp
create mode 100644 cv-node/src/local.cpp
create mode 100644 cv-node/src/main.cpp
create mode 100644 cv-node/src/sync.cpp
diff --git a/cv-node/CMakeLists.txt b/cv-node/CMakeLists.txt
new file mode 100644
index 000000000..17f4d3d72
--- /dev/null
+++ b/cv-node/CMakeLists.txt
@@ -0,0 +1,62 @@
+cmake_minimum_required (VERSION 3.1.0)
+include (CheckIncludeFile)
+include (CheckFunctionExists)
+
+project (cv-node)
+
+include(CTest)
+enable_testing()
+
+set(THREADS_PREFER_PTHREAD_FLAG ON)
+
+find_package( OpenCV REQUIRED )
+find_package( Threads REQUIRED )
+#find_package(PkgConfig)
+#pkg_check_modules(GTKMM gtkmm-3.0)
+
+# Need to include staged files and libs
+include_directories(${PROJECT_SOURCE_DIR}/include)
+include_directories(${PROJECT_BINARY_DIR})
+
+set(ftl_VERSION_MAJOR "1")
+set(ftl_VERSION_MINOR "0")
+set(ftl_VERSION_PATCH "0")
+set(FTL_VERSION "${ftl_VERSION_MAJOR}.${ftl_VERSION_MINOR}.${ftl_VERSION_PATCH}")
+add_definitions(-DFTL_VERSION=${FTL_VERSION})
+
+if (WIN32)
+ set(FTL_CONFIG_ROOT "$ENV{USERPROFILE}/AppData/ftl")
+ set(FTL_CACHE_ROOT "$ENV{USERPROFILE}/AppData/ftl")
+ set(FTL_DATA_ROOT "$ENV{USERPROFILE}/AppData/ftl")
+ add_definitions(-DWIN32)
+endif (WIN32)
+
+if (UNIX)
+ add_definitions(-DUNIX)
+ set(FTL_CONFIG_ROOT "$ENV{HOME}/.config/ftl")
+ set(FTL_CACHE_ROOT "$ENV{HOME}/.cache/ftl")
+ set(FTL_DATA_ROOT "$ENV{HOME}/.local/share/ftl")
+endif (UNIX)
+
+add_definitions(-DFTL_CONFIG_ROOT=${FTL_CONFIG_ROOT})
+add_definitions(-DFTL_CACHE_ROOT=${FTL_CACHE_ROOT})
+add_definitions(-DFTL_DATA_ROOT=${FTL_DATA_ROOT})
+
+set(CMAKE_CXX_FLAGS "-pthread -std=c++17 -Wall -Wno-deprecated -Werror -Wno-psabi")
+set(CMAKE_CXX_FLAGS_DEBUG "-D_DEBUG -pg -Wall -Werror")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3")
+
+SET(CMAKE_USE_RELATIVE_PATHS ON)
+
+set(CVNODESRC
+ src/main.cpp
+ src/calibrate.cpp
+ src/local.cpp
+ src/sync.cpp
+)
+
+add_executable(cv-node ${CVNODESRC})
+target_include_directories(cv-node PUBLIC ${PROJECT_SOURCE_DIR}/include)
+target_link_libraries(cv-node Threads::Threads ${OpenCV_LIBS} glog)
+
+
diff --git a/cv-node/config/in_VID5.xml b/cv-node/config/in_VID5.xml
new file mode 100644
index 000000000..42e80c851
--- /dev/null
+++ b/cv-node/config/in_VID5.xml
@@ -0,0 +1,59 @@
+<?xml version="1.0"?>
+<opencv_storage>
+<Settings>
+ <!-- Number of inner corners per a item row and column. (square, circle) -->
+ <BoardSize_Width> 9</BoardSize_Width>
+ <BoardSize_Height>6</BoardSize_Height>
+
+ <!-- The size of a square in some user defined metric system (pixel, millimeter)-->
+ <Square_Size>50</Square_Size>
+
+ <!-- The type of input used for camera calibration. One of: CHESSBOARD CIRCLES_GRID ASYMMETRIC_CIRCLES_GRID -->
+ <Calibrate_Pattern>"CHESSBOARD"</Calibrate_Pattern>
+
+ <!-- The input to use for calibration.
+ To use an input camera -> give the ID of the camera, like "1"
+ To use an input video -> give the path of the input video, like "/tmp/x.avi"
+ To use an image list -> give the path to the XML or YAML file containing the list of the images, like "/tmp/circles_list.xml"
+ -->
+ <Input>"images/CameraCalibration/VID5/VID5.xml"</Input>
+ <!-- If true (non-zero) we flip the input images around the horizontal axis.-->
+ <Input_FlipAroundHorizontalAxis>0</Input_FlipAroundHorizontalAxis>
+
+ <!-- Time delay between frames in case of camera. -->
+ <Input_Delay>100</Input_Delay>
+
+ <!-- How many frames to use, for calibration. -->
+ <Calibrate_NrOfFrameToUse>25</Calibrate_NrOfFrameToUse>
+ <!-- Consider only fy as a free parameter, the ratio fx/fy stays the same as in the input cameraMatrix.
+ Use or not setting. 0 - False Non-Zero - True-->
+ <Calibrate_FixAspectRatio> 1 </Calibrate_FixAspectRatio>
+ <!-- If true (non-zero) tangential distortion coefficients are set to zeros and stay zero.-->
+ <Calibrate_AssumeZeroTangentialDistortion>1</Calibrate_AssumeZeroTangentialDistortion>
+ <!-- If true (non-zero) the principal point is not changed during the global optimization.-->
+ <Calibrate_FixPrincipalPointAtTheCenter> 1 </Calibrate_FixPrincipalPointAtTheCenter>
+
+ <!-- The name of the output log file. -->
+ <Write_outputFileName>"out_camera_data.xml"</Write_outputFileName>
+ <!-- If true (non-zero) we write to the output file the feature points.-->
+ <Write_DetectedFeaturePoints>1</Write_DetectedFeaturePoints>
+ <!-- If true (non-zero) we write to the output file the extrinsic camera parameters.-->
+ <Write_extrinsicParameters>1</Write_extrinsicParameters>
+ <!-- If true (non-zero) we write to the output file the refined 3D target grid points.-->
+ <Write_gridPoints>1</Write_gridPoints>
+ <!-- If true (non-zero) we show after calibration the undistorted images.-->
+ <Show_UndistortedImage>1</Show_UndistortedImage>
+ <!-- If true (non-zero) will be used fisheye camera model.-->
+ <Calibrate_UseFisheyeModel>0</Calibrate_UseFisheyeModel>
+ <!-- If true (non-zero) distortion coefficient k1 will be equals to zero.-->
+ <Fix_K1>0</Fix_K1>
+ <!-- If true (non-zero) distortion coefficient k2 will be equals to zero.-->
+ <Fix_K2>0</Fix_K2>
+ <!-- If true (non-zero) distortion coefficient k3 will be equals to zero.-->
+ <Fix_K3>0</Fix_K3>
+ <!-- If true (non-zero) distortion coefficient k4 will be equals to zero.-->
+ <Fix_K4>1</Fix_K4>
+ <!-- If true (non-zero) distortion coefficient k5 will be equals to zero.-->
+ <Fix_K5>1</Fix_K5>
+</Settings>
+</opencv_storage>
diff --git a/cv-node/include/ftl/calibrate.hpp b/cv-node/include/ftl/calibrate.hpp
new file mode 100644
index 000000000..fee7647e2
--- /dev/null
+++ b/cv-node/include/ftl/calibrate.hpp
@@ -0,0 +1,29 @@
+#ifndef _FTL_CALIBRATION_HPP_
+#define _FTL_CALIBRATION_HPP_
+
+#include <opencv2/opencv.hpp>
+#include <ftl/local.hpp>
+#include <string>
+
+namespace ftl {
+class Calibrate {
+ public:
+ Calibrate(ftl::LocalSource *s, const std::string &cal);
+
+ bool recalibrate(const std::string &conf);
+
+ bool undistort(cv::Mat &l, cv::Mat &r);
+ bool rectified(cv::Mat &l, cv::Mat &r);
+
+ bool isCalibrated();
+
+ private:
+ bool runCalibration(cv::Mat &img, cv::Mat &cam);
+
+ private:
+ ftl::LocalSource *local_;
+};
+};
+
+#endif // _FTL_CALIBRATION_HPP_
+
diff --git a/cv-node/include/ftl/local.hpp b/cv-node/include/ftl/local.hpp
new file mode 100644
index 000000000..54f3f6916
--- /dev/null
+++ b/cv-node/include/ftl/local.hpp
@@ -0,0 +1,38 @@
+#ifndef _FTL_LOCAL_HPP_
+#define _FTL_LOCAL_HPP_
+
+#include <string>
+
+namespace cv {
+ class Mat;
+ class VideoCapture;
+};
+
+namespace ftl {
+class LocalSource {
+ public:
+ LocalSource();
+ LocalSource(const std::string &vid);
+
+ //bool left(cv::Mat &m);
+ //bool right(cv::Mat &m);
+ bool get(cv::Mat &l, cv::Mat &r);
+
+ //void setFramerate(float fps);
+ //float getFramerate() const;
+
+ double getTimestamp() const;
+
+ bool isStereo() const;
+
+ private:
+ double timestamp_;
+ bool stereo_;
+ //float fps_;
+ cv::VideoCapture *camera_a_;
+ cv::VideoCapture *camera_b_;
+};
+};
+
+#endif // _FTL_LOCAL_HPP_
+
diff --git a/cv-node/include/ftl/synched.hpp b/cv-node/include/ftl/synched.hpp
new file mode 100644
index 000000000..75aafcd45
--- /dev/null
+++ b/cv-node/include/ftl/synched.hpp
@@ -0,0 +1,28 @@
+#ifndef _FTL_SYNCHED_HPP_
+#define _FTL_SYNCHED_HPP_
+
+#include <opencv2/opencv.hpp>
+#include <string>
+#include <vector>
+
+namespace ftl {
+
+static const int LEFT = 0;
+static const int RIGHT = 1;
+
+class SyncSource {
+ public:
+ SyncSource();
+
+ void addChannel(const std::string &c);
+ void feed(int channel, cv::Mat &m, double ts);
+ bool get(int channel, cv::Mat &m);
+ double latency() const;
+
+ private:
+ std::vector<cv::Mat> channels_;
+};
+};
+
+#endif // _FTL_SYNCHED_HPP_
+
diff --git a/cv-node/src/calibrate.cpp b/cv-node/src/calibrate.cpp
new file mode 100644
index 000000000..16e88d7db
--- /dev/null
+++ b/cv-node/src/calibrate.cpp
@@ -0,0 +1,752 @@
+#include <iostream>
+#include <sstream>
+#include <string>
+#include <ctime>
+#include <cstdio>
+
+#include <ftl/calibrate.hpp>
+
+#include <opencv2/core.hpp>
+#include <opencv2/core/utility.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/calib3d.hpp>
+#include <opencv2/imgcodecs.hpp>
+#include <opencv2/videoio.hpp>
+#include <opencv2/highgui.hpp>
+
+using namespace cv;
+using namespace std;
+
+using ftl::Calibrate;
+
+class Settings
+{
+public:
+ Settings() : goodInput(false) {}
+ enum Pattern { NOT_EXISTING, CHESSBOARD, CIRCLES_GRID, ASYMMETRIC_CIRCLES_GRID };
+ enum InputType { INVALID, CAMERA, VIDEO_FILE, IMAGE_LIST };
+
+ void write(FileStorage& fs) const //Write serialization for this class
+ {
+ fs << "{"
+ << "BoardSize_Width" << boardSize.width
+ << "BoardSize_Height" << boardSize.height
+ << "Square_Size" << squareSize
+ << "Calibrate_Pattern" << patternToUse
+ << "Calibrate_NrOfFrameToUse" << nrFrames
+ << "Calibrate_FixAspectRatio" << aspectRatio
+ << "Calibrate_AssumeZeroTangentialDistortion" << calibZeroTangentDist
+ << "Calibrate_FixPrincipalPointAtTheCenter" << calibFixPrincipalPoint
+
+ << "Write_DetectedFeaturePoints" << writePoints
+ << "Write_extrinsicParameters" << writeExtrinsics
+ << "Write_gridPoints" << writeGrid
+ << "Write_outputFileName" << outputFileName
+
+ << "Show_UndistortedImage" << showUndistorsed
+
+ << "Input_FlipAroundHorizontalAxis" << flipVertical
+ << "Input_Delay" << delay
+ << "Input" << input
+ << "}";
+ }
+ void read(const FileNode& node) //Read serialization for this class
+ {
+ node["BoardSize_Width" ] >> boardSize.width;
+ node["BoardSize_Height"] >> boardSize.height;
+ node["Calibrate_Pattern"] >> patternToUse;
+ node["Square_Size"] >> squareSize;
+ node["Calibrate_NrOfFrameToUse"] >> nrFrames;
+ node["Calibrate_FixAspectRatio"] >> aspectRatio;
+ node["Write_DetectedFeaturePoints"] >> writePoints;
+ node["Write_extrinsicParameters"] >> writeExtrinsics;
+ node["Write_gridPoints"] >> writeGrid;
+ node["Write_outputFileName"] >> outputFileName;
+ node["Calibrate_AssumeZeroTangentialDistortion"] >> calibZeroTangentDist;
+ node["Calibrate_FixPrincipalPointAtTheCenter"] >> calibFixPrincipalPoint;
+ node["Calibrate_UseFisheyeModel"] >> useFisheye;
+ node["Input_FlipAroundHorizontalAxis"] >> flipVertical;
+ node["Show_UndistortedImage"] >> showUndistorsed;
+ node["Input"] >> input;
+ node["Input_Delay"] >> delay;
+ node["Fix_K1"] >> fixK1;
+ node["Fix_K2"] >> fixK2;
+ node["Fix_K3"] >> fixK3;
+ node["Fix_K4"] >> fixK4;
+ node["Fix_K5"] >> fixK5;
+
+ validate();
+ }
+ void validate()
+ {
+ goodInput = true;
+ if (boardSize.width <= 0 || boardSize.height <= 0)
+ {
+ cerr << "Invalid Board size: " << boardSize.width << " " << boardSize.height << endl;
+ goodInput = false;
+ }
+ if (squareSize <= 10e-6)
+ {
+ cerr << "Invalid square size " << squareSize << endl;
+ goodInput = false;
+ }
+ if (nrFrames <= 0)
+ {
+ cerr << "Invalid number of frames " << nrFrames << endl;
+ goodInput = false;
+ }
+
+ if (input.empty()) // Check for valid input
+ inputType = INVALID;
+ else
+ {
+ if (input[0] >= '0' && input[0] <= '9')
+ {
+ stringstream ss(input);
+ ss >> cameraID;
+ inputType = CAMERA;
+ }
+ else
+ {
+ if (isListOfImages(input) && readStringList(input, imageList))
+ {
+ inputType = IMAGE_LIST;
+ nrFrames = (nrFrames < (int)imageList.size()) ? nrFrames : (int)imageList.size();
+ }
+ else
+ inputType = VIDEO_FILE;
+ }
+ if (inputType == CAMERA)
+ inputCapture.open(cameraID);
+ if (inputType == VIDEO_FILE)
+ inputCapture.open(input);
+ if (inputType != IMAGE_LIST && !inputCapture.isOpened())
+ inputType = INVALID;
+ }
+ if (inputType == INVALID)
+ {
+ cerr << " Input does not exist: " << input;
+ goodInput = false;
+ }
+
+ flag = 0;
+ if(calibFixPrincipalPoint) flag |= CALIB_FIX_PRINCIPAL_POINT;
+ if(calibZeroTangentDist) flag |= CALIB_ZERO_TANGENT_DIST;
+ if(aspectRatio) flag |= CALIB_FIX_ASPECT_RATIO;
+ if(fixK1) flag |= CALIB_FIX_K1;
+ if(fixK2) flag |= CALIB_FIX_K2;
+ if(fixK3) flag |= CALIB_FIX_K3;
+ if(fixK4) flag |= CALIB_FIX_K4;
+ if(fixK5) flag |= CALIB_FIX_K5;
+
+ if (useFisheye) {
+ // the fisheye model has its own enum, so overwrite the flags
+ flag = fisheye::CALIB_FIX_SKEW | fisheye::CALIB_RECOMPUTE_EXTRINSIC;
+ if(fixK1) flag |= fisheye::CALIB_FIX_K1;
+ if(fixK2) flag |= fisheye::CALIB_FIX_K2;
+ if(fixK3) flag |= fisheye::CALIB_FIX_K3;
+ if(fixK4) flag |= fisheye::CALIB_FIX_K4;
+ if (calibFixPrincipalPoint) flag |= fisheye::CALIB_FIX_PRINCIPAL_POINT;
+ }
+
+ calibrationPattern = NOT_EXISTING;
+ if (!patternToUse.compare("CHESSBOARD")) calibrationPattern = CHESSBOARD;
+ if (!patternToUse.compare("CIRCLES_GRID")) calibrationPattern = CIRCLES_GRID;
+ if (!patternToUse.compare("ASYMMETRIC_CIRCLES_GRID")) calibrationPattern = ASYMMETRIC_CIRCLES_GRID;
+ if (calibrationPattern == NOT_EXISTING)
+ {
+ cerr << " Camera calibration mode does not exist: " << patternToUse << endl;
+ goodInput = false;
+ }
+ atImageList = 0;
+
+ }
+ Mat nextImage()
+ {
+ Mat result;
+ if( inputCapture.isOpened() )
+ {
+ Mat view0;
+ inputCapture >> view0;
+ view0.copyTo(result);
+ }
+ else if( atImageList < imageList.size() )
+ result = imread(imageList[atImageList++], IMREAD_COLOR);
+
+ return result;
+ }
+
+ static bool readStringList( const string& filename, vector<string>& l )
+ {
+ l.clear();
+ FileStorage fs(filename, FileStorage::READ);
+ if( !fs.isOpened() )
+ return false;
+ FileNode n = fs.getFirstTopLevelNode();
+ if( n.type() != FileNode::SEQ )
+ return false;
+ FileNodeIterator it = n.begin(), it_end = n.end();
+ for( ; it != it_end; ++it )
+ l.push_back((string)*it);
+ return true;
+ }
+
+ static bool isListOfImages( const string& filename)
+ {
+ string s(filename);
+ // Look for file extension
+ if( s.find(".xml") == string::npos && s.find(".yaml") == string::npos && s.find(".yml") == string::npos )
+ return false;
+ else
+ return true;
+ }
+public:
+ Size boardSize; // The size of the board -> Number of items by width and height
+ Pattern calibrationPattern; // One of the Chessboard, circles, or asymmetric circle pattern
+ float squareSize; // The size of a square in your defined unit (point, millimeter,etc).
+ int nrFrames; // The number of frames to use from the input for calibration
+ float aspectRatio; // The aspect ratio
+ int delay; // In case of a video input
+ bool writePoints; // Write detected feature points
+ bool writeExtrinsics; // Write extrinsic parameters
+ bool writeGrid; // Write refined 3D target grid points
+ bool calibZeroTangentDist; // Assume zero tangential distortion
+ bool calibFixPrincipalPoint; // Fix the principal point at the center
+ bool flipVertical; // Flip the captured images around the horizontal axis
+ string outputFileName; // The name of the file where to write
+ bool showUndistorsed; // Show undistorted images after calibration
+ string input; // The input ->
+ bool useFisheye; // use fisheye camera model for calibration
+ bool fixK1; // fix K1 distortion coefficient
+ bool fixK2; // fix K2 distortion coefficient
+ bool fixK3; // fix K3 distortion coefficient
+ bool fixK4; // fix K4 distortion coefficient
+ bool fixK5; // fix K5 distortion coefficient
+
+ int cameraID;
+ vector<string> imageList;
+ size_t atImageList;
+ VideoCapture inputCapture;
+ InputType inputType;
+ bool goodInput;
+ int flag;
+
+private:
+ string patternToUse;
+
+
+};
+
+static inline void read(const FileNode& node, Settings& x, const Settings& default_value = Settings())
+{
+ if(node.empty())
+ x = default_value;
+ else
+ x.read(node);
+}
+
+Calibrate::Calibrate(ftl::LocalSource *s, const std::string &cal) : local_(s) {
+
+}
+
+bool Calibrate::recalibrate(const std::string &conf) {
+ return false;
+}
+
+bool Calibrate::undistort(cv::Mat &l, cv::Mat &r) {
+ local_->get(l,r);
+ return false;
+}
+
+bool Calibrate::rectified(cv::Mat &l, cv::Mat &r) {
+ return undistort(l,r);
+}
+
+bool Calibrate::isCalibrated() {
+ return false;
+}
+
+enum { DETECTION = 0, CAPTURING = 1, CALIBRATED = 2 };
+
+bool runCalibrationAndSave(Settings& s, Size imageSize, Mat& cameraMatrix, Mat& distCoeffs,
+ vector<vector<Point2f> > imagePoints, float grid_width, bool release_object);
+
+int main2(int argc, char* argv[])
+{
+
+
+ //! [file_read]
+ Settings s;
+ const string inputSettingsFile = parser.get<string>(0);
+ FileStorage fs(inputSettingsFile, FileStorage::READ); // Read the settings
+ if (!fs.isOpened())
+ {
+ cout << "Could not open the configuration file: \"" << inputSettingsFile << "\"" << endl;
+ parser.printMessage();
+ return -1;
+ }
+ fs["Settings"] >> s;
+ fs.release(); // close Settings file
+ //! [file_read]
+
+ //FileStorage fout("settings.yml", FileStorage::WRITE); // write config as YAML
+ //fout << "Settings" << s;
+
+ if (!s.goodInput)
+ {
+ cout << "Invalid input detected. Application stopping. " << endl;
+ return -1;
+ }
+
+ int winSize = parser.get<int>("winSize");
+
+ float grid_width = s.squareSize * (s.boardSize.width - 1);
+ bool release_object = false;
+ if (parser.has("d")) {
+ grid_width = parser.get<float>("d");
+ release_object = true;
+ }
+
+ vector<vector<Point2f> > imagePoints;
+ Mat cameraMatrix, distCoeffs;
+ Size imageSize;
+ int mode = s.inputType == Settings::IMAGE_LIST ? CAPTURING : DETECTION;
+ clock_t prevTimestamp = 0;
+ const Scalar RED(0,0,255), GREEN(0,255,0);
+ const char ESC_KEY = 27;
+
+ //! [get_input]
+ for(;;)
+ {
+ Mat view;
+ bool blinkOutput = false;
+
+ view = s.nextImage();
+
+ //----- If no more image, or got enough, then stop calibration and show result -------------
+ if( mode == CAPTURING && imagePoints.size() >= (size_t)s.nrFrames )
+ {
+ if(runCalibrationAndSave(s, imageSize, cameraMatrix, distCoeffs, imagePoints, grid_width,
+ release_object))
+ mode = CALIBRATED;
+ else
+ mode = DETECTION;
+ }
+ if(view.empty()) // If there are no more images stop the loop
+ {
+ // if calibration threshold was not reached yet, calibrate now
+ if( mode != CALIBRATED && !imagePoints.empty() )
+ runCalibrationAndSave(s, imageSize, cameraMatrix, distCoeffs, imagePoints, grid_width,
+ release_object);
+ break;
+ }
+ //! [get_input]
+
+ imageSize = view.size(); // Format input image.
+ if( s.flipVertical ) flip( view, view, 0 );
+
+ //! [find_pattern]
+ vector<Point2f> pointBuf;
+
+ bool found;
+
+ int chessBoardFlags = CALIB_CB_ADAPTIVE_THRESH | CALIB_CB_NORMALIZE_IMAGE;
+
+ if(!s.useFisheye) {
+ // fast check erroneously fails with high distortions like fisheye
+ chessBoardFlags |= CALIB_CB_FAST_CHECK;
+ }
+
+ switch( s.calibrationPattern ) // Find feature points on the input format
+ {
+ case Settings::CHESSBOARD:
+ found = findChessboardCorners( view, s.boardSize, pointBuf, chessBoardFlags);
+ break;
+ case Settings::CIRCLES_GRID:
+ found = findCirclesGrid( view, s.boardSize, pointBuf );
+ break;
+ case Settings::ASYMMETRIC_CIRCLES_GRID:
+ found = findCirclesGrid( view, s.boardSize, pointBuf, CALIB_CB_ASYMMETRIC_GRID );
+ break;
+ default:
+ found = false;
+ break;
+ }
+ //! [find_pattern]
+ //! [pattern_found]
+ if ( found) // If done with success,
+ {
+ // improve the found corners' coordinate accuracy for chessboard
+ if( s.calibrationPattern == Settings::CHESSBOARD)
+ {
+ Mat viewGray;
+ cvtColor(view, viewGray, COLOR_BGR2GRAY);
+ cornerSubPix( viewGray, pointBuf, Size(winSize,winSize),
+ Size(-1,-1), TermCriteria( TermCriteria::EPS+TermCriteria::COUNT, 30, 0.0001 ));
+ }
+
+ if( mode == CAPTURING && // For camera only take new samples after delay time
+ (!s.inputCapture.isOpened() || clock() - prevTimestamp > s.delay*1e-3*CLOCKS_PER_SEC) )
+ {
+ imagePoints.push_back(pointBuf);
+ prevTimestamp = clock();
+ blinkOutput = s.inputCapture.isOpened();
+ }
+
+ // Draw the corners.
+ drawChessboardCorners( view, s.boardSize, Mat(pointBuf), found );
+ }
+ //! [pattern_found]
+ //----------------------------- Output Text ------------------------------------------------
+ //! [output_text]
+ string msg = (mode == CAPTURING) ? "100/100" :
+ mode == CALIBRATED ? "Calibrated" : "Press 'g' to start";
+ int baseLine = 0;
+ Size textSize = getTextSize(msg, 1, 1, 1, &baseLine);
+ Point textOrigin(view.cols - 2*textSize.width - 10, view.rows - 2*baseLine - 10);
+
+ if( mode == CAPTURING )
+ {
+ if(s.showUndistorsed)
+ msg = format( "%d/%d Undist", (int)imagePoints.size(), s.nrFrames );
+ else
+ msg = format( "%d/%d", (int)imagePoints.size(), s.nrFrames );
+ }
+
+ putText( view, msg, textOrigin, 1, 1, mode == CALIBRATED ? GREEN : RED);
+
+ if( blinkOutput )
+ bitwise_not(view, view);
+ //! [output_text]
+ //------------------------- Video capture output undistorted ------------------------------
+ //! [output_undistorted]
+ if( mode == CALIBRATED && s.showUndistorsed )
+ {
+ Mat temp = view.clone();
+ if (s.useFisheye)
+ cv::fisheye::undistortImage(temp, view, cameraMatrix, distCoeffs);
+ else
+ undistort(temp, view, cameraMatrix, distCoeffs);
+ }
+ //! [output_undistorted]
+ //------------------------------ Show image and check for input commands -------------------
+ //! [await_input]
+ imshow("Image View", view);
+ char key = (char)waitKey(s.inputCapture.isOpened() ? 50 : s.delay);
+
+ if( key == ESC_KEY )
+ break;
+
+ if( key == 'u' && mode == CALIBRATED )
+ s.showUndistorsed = !s.showUndistorsed;
+
+ if( s.inputCapture.isOpened() && key == 'g' )
+ {
+ mode = CAPTURING;
+ imagePoints.clear();
+ }
+ //! [await_input]
+ }
+
+ // -----------------------Show the undistorted image for the image list ------------------------
+ //! [show_results]
+ if( s.inputType == Settings::IMAGE_LIST && s.showUndistorsed )
+ {
+ Mat view, rview, map1, map2;
+
+ if (s.useFisheye)
+ {
+ Mat newCamMat;
+ fisheye::estimateNewCameraMatrixForUndistortRectify(cameraMatrix, distCoeffs, imageSize,
+ Matx33d::eye(), newCamMat, 1);
+ fisheye::initUndistortRectifyMap(cameraMatrix, distCoeffs, Matx33d::eye(), newCamMat, imageSize,
+ CV_16SC2, map1, map2);
+ }
+ else
+ {
+ initUndistortRectifyMap(
+ cameraMatrix, distCoeffs, Mat(),
+ getOptimalNewCameraMatrix(cameraMatrix, distCoeffs, imageSize, 1, imageSize, 0), imageSize,
+ CV_16SC2, map1, map2);
+ }
+
+ for(size_t i = 0; i < s.imageList.size(); i++ )
+ {
+ view = imread(s.imageList[i], IMREAD_COLOR);
+ if(view.empty())
+ continue;
+ remap(view, rview, map1, map2, INTER_LINEAR);
+ imshow("Image View", rview);
+ char c = (char)waitKey();
+ if( c == ESC_KEY || c == 'q' || c == 'Q' )
+ break;
+ }
+ }
+ //! [show_results]
+
+ return 0;
+}
+
+//! [compute_errors]
+static double computeReprojectionErrors( const vector<vector<Point3f> >& objectPoints,
+ const vector<vector<Point2f> >& imagePoints,
+ const vector<Mat>& rvecs, const vector<Mat>& tvecs,
+ const Mat& cameraMatrix , const Mat& distCoeffs,
+ vector<float>& perViewErrors, bool fisheye)
+{
+ vector<Point2f> imagePoints2;
+ size_t totalPoints = 0;
+ double totalErr = 0, err;
+ perViewErrors.resize(objectPoints.size());
+
+ for(size_t i = 0; i < objectPoints.size(); ++i )
+ {
+ if (fisheye)
+ {
+ fisheye::projectPoints(objectPoints[i], imagePoints2, rvecs[i], tvecs[i], cameraMatrix,
+ distCoeffs);
+ }
+ else
+ {
+ projectPoints(objectPoints[i], rvecs[i], tvecs[i], cameraMatrix, distCoeffs, imagePoints2);
+ }
+ err = norm(imagePoints[i], imagePoints2, NORM_L2);
+
+ size_t n = objectPoints[i].size();
+ perViewErrors[i] = (float) std::sqrt(err*err/n);
+ totalErr += err*err;
+ totalPoints += n;
+ }
+
+ return std::sqrt(totalErr/totalPoints);
+}
+//! [compute_errors]
+//! [board_corners]
+static void calcBoardCornerPositions(Size boardSize, float squareSize, vector<Point3f>& corners,
+ Settings::Pattern patternType /*= Settings::CHESSBOARD*/)
+{
+ corners.clear();
+
+ switch(patternType)
+ {
+ case Settings::CHESSBOARD:
+ case Settings::CIRCLES_GRID:
+ for( int i = 0; i < boardSize.height; ++i )
+ for( int j = 0; j < boardSize.width; ++j )
+ corners.push_back(Point3f(j*squareSize, i*squareSize, 0));
+ break;
+
+ case Settings::ASYMMETRIC_CIRCLES_GRID:
+ for( int i = 0; i < boardSize.height; i++ )
+ for( int j = 0; j < boardSize.width; j++ )
+ corners.push_back(Point3f((2*j + i % 2)*squareSize, i*squareSize, 0));
+ break;
+ default:
+ break;
+ }
+}
+//! [board_corners]
+static bool runCalibration( Settings& s, Size& imageSize, Mat& cameraMatrix, Mat& distCoeffs,
+ vector<vector<Point2f> > imagePoints, vector<Mat>& rvecs, vector<Mat>& tvecs,
+ vector<float>& reprojErrs, double& totalAvgErr, vector<Point3f>& newObjPoints,
+ float grid_width, bool release_object)
+{
+ //! [fixed_aspect]
+ cameraMatrix = Mat::eye(3, 3, CV_64F);
+ if( s.flag & CALIB_FIX_ASPECT_RATIO )
+ cameraMatrix.at<double>(0,0) = s.aspectRatio;
+ //! [fixed_aspect]
+ if (s.useFisheye) {
+ distCoeffs = Mat::zeros(4, 1, CV_64F);
+ } else {
+ distCoeffs = Mat::zeros(8, 1, CV_64F);
+ }
+
+ vector<vector<Point3f> > objectPoints(1);
+ calcBoardCornerPositions(s.boardSize, s.squareSize, objectPoints[0], s.calibrationPattern);
+ objectPoints[0][s.boardSize.width - 1].x = objectPoints[0][0].x + grid_width;
+ newObjPoints = objectPoints[0];
+
+ objectPoints.resize(imagePoints.size(),objectPoints[0]);
+
+ //Find intrinsic and extrinsic camera parameters
+ double rms;
+
+ if (s.useFisheye) {
+ Mat _rvecs, _tvecs;
+ rms = fisheye::calibrate(objectPoints, imagePoints, imageSize, cameraMatrix, distCoeffs, _rvecs,
+ _tvecs, s.flag);
+
+ rvecs.reserve(_rvecs.rows);
+ tvecs.reserve(_tvecs.rows);
+ for(int i = 0; i < int(objectPoints.size()); i++){
+ rvecs.push_back(_rvecs.row(i));
+ tvecs.push_back(_tvecs.row(i));
+ }
+ } else {
+ int iFixedPoint = -1;
+ if (release_object)
+ iFixedPoint = s.boardSize.width - 1;
+ rms = calibrateCameraRO(objectPoints, imagePoints, imageSize, iFixedPoint,
+ cameraMatrix, distCoeffs, rvecs, tvecs, newObjPoints,
+ s.flag | CALIB_USE_LU);
+ }
+
+ if (release_object) {
+ cout << "New board corners: " << endl;
+ cout << newObjPoints[0] << endl;
+ cout << newObjPoints[s.boardSize.width - 1] << endl;
+ cout << newObjPoints[s.boardSize.width * (s.boardSize.height - 1)] << endl;
+ cout << newObjPoints.back() << endl;
+ }
+
+ cout << "Re-projection error reported by calibrateCamera: "<< rms << endl;
+
+ bool ok = checkRange(cameraMatrix) && checkRange(distCoeffs);
+
+ objectPoints.clear();
+ objectPoints.resize(imagePoints.size(), newObjPoints);
+ totalAvgErr = computeReprojectionErrors(objectPoints, imagePoints, rvecs, tvecs, cameraMatrix,
+ distCoeffs, reprojErrs, s.useFisheye);
+
+ return ok;
+}
+
+// Print camera parameters to the output file
+static void saveCameraParams( Settings& s, Size& imageSize, Mat& cameraMatrix, Mat& distCoeffs,
+ const vector<Mat>& rvecs, const vector<Mat>& tvecs,
+ const vector<float>& reprojErrs, const vector<vector<Point2f> >& imagePoints,
+ double totalAvgErr, const vector<Point3f>& newObjPoints )
+{
+ FileStorage fs( s.outputFileName, FileStorage::WRITE );
+
+ time_t tm;
+ time( &tm );
+ struct tm *t2 = localtime( &tm );
+ char buf[1024];
+ strftime( buf, sizeof(buf), "%c", t2 );
+
+ fs << "calibration_time" << buf;
+
+ if( !rvecs.empty() || !reprojErrs.empty() )
+ fs << "nr_of_frames" << (int)std::max(rvecs.size(), reprojErrs.size());
+ fs << "image_width" << imageSize.width;
+ fs << "image_height" << imageSize.height;
+ fs << "board_width" << s.boardSize.width;
+ fs << "board_height" << s.boardSize.height;
+ fs << "square_size" << s.squareSize;
+
+ if( s.flag & CALIB_FIX_ASPECT_RATIO )
+ fs << "fix_aspect_ratio" << s.aspectRatio;
+
+ if (s.flag)
+ {
+ std::stringstream flagsStringStream;
+ if (s.useFisheye)
+ {
+ flagsStringStream << "flags:"
+ << (s.flag & fisheye::CALIB_FIX_SKEW ? " +fix_skew" : "")
+ << (s.flag & fisheye::CALIB_FIX_K1 ? " +fix_k1" : "")
+ << (s.flag & fisheye::CALIB_FIX_K2 ? " +fix_k2" : "")
+ << (s.flag & fisheye::CALIB_FIX_K3 ? " +fix_k3" : "")
+ << (s.flag & fisheye::CALIB_FIX_K4 ? " +fix_k4" : "")
+ << (s.flag & fisheye::CALIB_RECOMPUTE_EXTRINSIC ? " +recompute_extrinsic" : "");
+ }
+ else
+ {
+ flagsStringStream << "flags:"
+ << (s.flag & CALIB_USE_INTRINSIC_GUESS ? " +use_intrinsic_guess" : "")
+ << (s.flag & CALIB_FIX_ASPECT_RATIO ? " +fix_aspectRatio" : "")
+ << (s.flag & CALIB_FIX_PRINCIPAL_POINT ? " +fix_principal_point" : "")
+ << (s.flag & CALIB_ZERO_TANGENT_DIST ? " +zero_tangent_dist" : "")
+ << (s.flag & CALIB_FIX_K1 ? " +fix_k1" : "")
+ << (s.flag & CALIB_FIX_K2 ? " +fix_k2" : "")
+ << (s.flag & CALIB_FIX_K3 ? " +fix_k3" : "")
+ << (s.flag & CALIB_FIX_K4 ? " +fix_k4" : "")
+ << (s.flag & CALIB_FIX_K5 ? " +fix_k5" : "");
+ }
+ fs.writeComment(flagsStringStream.str());
+ }
+
+ fs << "flags" << s.flag;
+
+ fs << "fisheye_model" << s.useFisheye;
+
+ fs << "camera_matrix" << cameraMatrix;
+ fs << "distortion_coefficients" << distCoeffs;
+
+ fs << "avg_reprojection_error" << totalAvgErr;
+ if (s.writeExtrinsics && !reprojErrs.empty())
+ fs << "per_view_reprojection_errors" << Mat(reprojErrs);
+
+ if(s.writeExtrinsics && !rvecs.empty() && !tvecs.empty() )
+ {
+ CV_Assert(rvecs[0].type() == tvecs[0].type());
+ Mat bigmat((int)rvecs.size(), 6, CV_MAKETYPE(rvecs[0].type(), 1));
+ bool needReshapeR = rvecs[0].depth() != 1 ? true : false;
+ bool needReshapeT = tvecs[0].depth() != 1 ? true : false;
+
+ for( size_t i = 0; i < rvecs.size(); i++ )
+ {
+ Mat r = bigmat(Range(int(i), int(i+1)), Range(0,3));
+ Mat t = bigmat(Range(int(i), int(i+1)), Range(3,6));
+
+ if(needReshapeR)
+ rvecs[i].reshape(1, 1).copyTo(r);
+ else
+ {
+ //*.t() is MatExpr (not Mat) so we can use assignment operator
+ CV_Assert(rvecs[i].rows == 3 && rvecs[i].cols == 1);
+ r = rvecs[i].t();
+ }
+
+ if(needReshapeT)
+ tvecs[i].reshape(1, 1).copyTo(t);
+ else
+ {
+ CV_Assert(tvecs[i].rows == 3 && tvecs[i].cols == 1);
+ t = tvecs[i].t();
+ }
+ }
+ fs.writeComment("a set of 6-tuples (rotation vector + translation vector) for each view");
+ fs << "extrinsic_parameters" << bigmat;
+ }
+
+ if(s.writePoints && !imagePoints.empty() )
+ {
+ Mat imagePtMat((int)imagePoints.size(), (int)imagePoints[0].size(), CV_32FC2);
+ for( size_t i = 0; i < imagePoints.size(); i++ )
+ {
+ Mat r = imagePtMat.row(int(i)).reshape(2, imagePtMat.cols);
+ Mat imgpti(imagePoints[i]);
+ imgpti.copyTo(r);
+ }
+ fs << "image_points" << imagePtMat;
+ }
+
+ if( s.writeGrid && !newObjPoints.empty() )
+ {
+ fs << "grid_points" << newObjPoints;
+ }
+}
+
+//! [run_and_save]
+bool runCalibrationAndSave(Settings& s, Size imageSize, Mat& cameraMatrix, Mat& distCoeffs,
+ vector<vector<Point2f> > imagePoints, float grid_width, bool release_object)
+{
+ vector<Mat> rvecs, tvecs;
+ vector<float> reprojErrs;
+ double totalAvgErr = 0;
+ vector<Point3f> newObjPoints;
+
+ bool ok = runCalibration(s, imageSize, cameraMatrix, distCoeffs, imagePoints, rvecs, tvecs, reprojErrs,
+ totalAvgErr, newObjPoints, grid_width, release_object);
+ cout << (ok ? "Calibration succeeded" : "Calibration failed")
+ << ". avg re projection error = " << totalAvgErr << endl;
+
+ if (ok)
+ saveCameraParams(s, imageSize, cameraMatrix, distCoeffs, rvecs, tvecs, reprojErrs, imagePoints,
+ totalAvgErr, newObjPoints);
+ return ok;
+}
+//! [run_and_save]
diff --git a/cv-node/src/local.cpp b/cv-node/src/local.cpp
new file mode 100644
index 000000000..1c4ddd0bd
--- /dev/null
+++ b/cv-node/src/local.cpp
@@ -0,0 +1,118 @@
+#include <ftl/local.hpp>
+
+#include <opencv2/core.hpp>
+#include <opencv2/opencv.hpp>
+#include <string>
+#include <chrono>
+#include <glog/logging.h>
+
+using ftl::LocalSource;
+using cv::Mat;
+using cv::VideoCapture;
+using cv::Rect;
+using std::string;
+using namespace std::chrono;
+
+LocalSource::LocalSource() : timestamp_(0.0) {
+ // Use cameras
+ camera_a_ = new VideoCapture(0);
+ camera_b_ = new VideoCapture(1);
+
+ if (!camera_a_->isOpened()) {
+ delete camera_a_;
+ delete camera_b_;
+ camera_a_ = nullptr;
+ camera_b_ = nullptr;
+ LOG(FATAL) << "No cameras found";
+ return;
+ }
+
+ if (!camera_b_->isOpened()) {
+ delete camera_b_;
+ camera_b_ = nullptr;
+ stereo_ = false;
+ LOG(WARNING) << "Not able to find second camera for stereo";
+ } else {
+ stereo_ = true;
+ }
+}
+
+LocalSource::LocalSource(const string &vid): timestamp_(0.0) {
+ if (vid == "") {
+ LOG(FATAL) << "No video file specified";
+ camera_a_ = nullptr;
+ camera_b_ = nullptr;
+ return;
+ }
+
+ camera_a_ = new VideoCapture(vid.c_str());
+ camera_b_ = nullptr;
+
+ if (!camera_a_->isOpened()) {
+ delete camera_a_;
+ camera_a_ = nullptr;
+ LOG(FATAL) << "Unable to load video file";
+ return;
+ }
+
+ // Read first frame to determine stereo
+ Mat frame;
+ if (!camera_a_->read(frame)) {
+ LOG(FATAL) << "No data in video file";
+ }
+
+ if (frame.cols >= 2*frame.rows) {
+ stereo_ = true;
+ } else {
+ stereo_ = false;
+ }
+}
+
+bool LocalSource::get(cv::Mat &l, cv::Mat &r) {
+ if (!camera_a_) return false;
+
+ if (!camera_a_->grab()) {
+ LOG(ERROR) << "Unable to grab from camera A";
+ return false;
+ }
+ if (camera_b_ && !camera_b_->grab()) {
+ LOG(ERROR) << "Unable to grab from camera B";
+ return false;
+ }
+
+ // Record timestamp
+ timestamp_ = duration_cast<duration<double>>(
+ high_resolution_clock::now().time_since_epoch()).count();
+
+ if (camera_b_ || !stereo_) {
+ if (!camera_a_->retrieve(l)) {
+ LOG(ERROR) << "Unable to read frame from camera A";
+ return false;
+ }
+ if (camera_b_ && !camera_b_->retrieve(r)) {
+ LOG(ERROR) << "Unable to read frame from camera B";
+ return false;
+ }
+ } else {
+ Mat frame;
+ if (!camera_a_->retrieve(frame)) {
+ LOG(ERROR) << "Unable to read frame from video";
+ return false;
+ }
+
+ int resx = frame.cols / 2;
+ l = Mat(frame, Rect(0,0,resx,frame.rows));
+ r = Mat(frame, Rect(resx,0,frame.cols,frame.rows));
+ }
+
+ return true;
+}
+
+double LocalSource::getTimestamp() const {
+ return timestamp_;
+}
+
+bool LocalSource::isStereo() const {
+ return stereo_;
+}
+
diff --git a/cv-node/src/main.cpp b/cv-node/src/main.cpp
new file mode 100644
index 000000000..bf4221399
--- /dev/null
+++ b/cv-node/src/main.cpp
@@ -0,0 +1,103 @@
+#include <opencv2/opencv.hpp>
+#include <ftl/local.hpp>
+#include <ftl/synched.hpp>
+#include <ftl/calibrate.hpp>
+
+#include <string>
+#include <vector>
+
+using namespace ftl;
+using std::string;
+using std::vector;
+using cv::Mat;
+
+static vector<string> OPTION_peers;
+static vector<string> OPTION_channels;
+static string OPTION_calibration_config;
+static string OPTION_config;
+static bool OPTION_display = false;
+static bool OPTION_calibrate = false;
+
+void handle_options(char ***argv, int *argc) {
+ while (*argc > 0) {
+ string cmd((*argv)[0]);
+ if (cmd[0] != '-') break;
+
+ if (cmd.find("--calibrate") == 0) {
+ OPTION_calibrate = true;
+ } else if (cmd.find("--peer=") == 0) {
+ cmd = cmd.substr(cmd.find("=")+1);
+ OPTION_peers.push_back(cmd);
+ } else if (cmd.find("--channel=") == 0) {
+ cmd = cmd.substr(cmd.find("=")+1);
+ OPTION_channels.push_back(cmd);
+ } else if (cmd.find("--calibration=") == 0) {
+ cmd = cmd.substr(cmd.find("=")+1);
+ OPTION_calibration_config = cmd;
+ } else if (cmd.find("--config=") == 0) {
+ cmd = cmd.substr(cmd.find("=")+1);
+ OPTION_config = cmd;
+ } else if (cmd.find("--display") == 0) {
+ OPTION_display = true;
+ }
+
+ (*argc)--;
+ (*argv)++;
+ }
+}
+
+int main(int argc, char **argv) {
+ argc--;
+ argv++;
+
+ // Process Arguments
+ handle_options(&argv, &argc);
+
+ // TODO Initiate the network
+
+ LocalSource *lsrc;
+
+ if (argc) {
+ // Load video file
+ lsrc = new LocalSource(argv[0]);
+ } else {
+ // Use cameras
+ lsrc = new LocalSource();
+ }
+
+ auto sync = new SyncSource(); // TODO Pass protocol object
+ // Add any remote channels
+ for (auto c : OPTION_channels) {
+ sync->addChannel(c);
+ }
+
+ Calibrate calibrate(lsrc, OPTION_calibration_config);
+
+ while (true) {
+ Mat l, r;
+
+ calibrate.undistort(l,r);
+
+ // Feed into sync buffer and network forward
+ sync->feed(LEFT, l,lsrc->getTimestamp());
+ sync->feed(RIGHT, r,lsrc->getTimestamp());
+
+ // Read back from buffer
+ sync->get(LEFT,l);
+ sync->get(RIGHT,r);
+ //double latency = sync->latency();
+
+ // TODO Pose and disparity etc here...
+
+ // TODO Send RGB+D data somewhere
+
+ cv::imshow("Left",l);
+ if (lsrc->isStereo()) cv::imshow("Right",r);
+
+ if(cv::waitKey(1) == 27){
+ //exit if ESC is pressed
+ break;
+ }
+ }
+}
+
diff --git a/cv-node/src/sync.cpp b/cv-node/src/sync.cpp
new file mode 100644
index 000000000..f57e51646
--- /dev/null
+++ b/cv-node/src/sync.cpp
@@ -0,0 +1,29 @@
+#include <ftl/synched.hpp>
+
+using ftl::SyncSource;
+using cv::Mat;
+
+SyncSource::SyncSource() {
+ channels_.push_back(Mat());
+ channels_.push_back(Mat());
+}
+
+void SyncSource::addChannel(const std::string &c) {
+
+}
+
+void SyncSource::feed(int channel, cv::Mat &m, double ts) {
+ if (channel > static_cast<int>(channels_.size())) return;
+ channels_[channel] = m;
+}
+
+bool SyncSource::get(int channel, cv::Mat &m) {
+ if (channel > static_cast<int>(channels_.size())) return false;
+ m = channels_[channel];
+ return true;
+}
+
+double SyncSource::latency() const {
+ return 0.0;
+}
+
--
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