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boofcv.app.CameraCalibration Maven / Gradle / Ivy
BoofCV is an open source Java library for real-time computer vision and robotics applications.
/*
* Copyright (c) 2011-2016, Peter Abeles. All Rights Reserved.
*
* This file is part of BoofCV (http://boofcv.org).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package boofcv.app;
import boofcv.abst.fiducial.calib.ConfigChessboard;
import boofcv.abst.fiducial.calib.ConfigSquareGrid;
import boofcv.abst.geo.calibration.CalibrateMonoPlanar;
import boofcv.abst.geo.calibration.CalibrationDetector;
import boofcv.app.calib.AssistedCalibration;
import boofcv.app.calib.AssistedCalibrationGui;
import boofcv.app.calib.ComputeGeometryScore;
import boofcv.factory.calib.FactoryCalibrationTarget;
import boofcv.gui.calibration.MonoPlanarPanel;
import boofcv.gui.image.ShowImages;
import boofcv.io.UtilIO;
import boofcv.io.image.ConvertBufferedImage;
import boofcv.io.image.UtilImageIO;
import boofcv.io.webcamcapture.UtilWebcamCapture;
import boofcv.struct.calib.IntrinsicParameters;
import boofcv.struct.image.GrayF32;
import com.github.sarxos.webcam.Webcam;
import javax.swing.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import static boofcv.app.calib.AssistedCalibration.*;
import static boofcv.app.calib.AssistedCalibration.OUTPUT_DIRECTORY;
/**
* Application for easily calibrating a webcam using a live stream
*
* @author Peter Abeles
*/
public class CameraCalibration extends BaseStandardInputApp {
protected String inputDirectory;
protected String outputFileName = "intrinsic.xml";
protected CalibrationDetector detector;
protected boolean zeroSkew = true;
protected int numRadial = 2;
protected boolean tangential = false;
protected boolean visualize = true;
public void printHelp() {
System.out.println("./application ");
System.out.println();
System.out.println(" file name for output");
System.out.println(" DEFAULT: \"intrinsic.xml\"");
System.out.println();
System.out.println("Input: File Options: ");
System.out.println();
System.out.println(" --Directory= Directory containing calibration images");
System.out.println(" --Visualize= Should it visualize the results?");
System.out.println(" DEFAULT: true");
System.out.println();
System.out.println("Input: Webcam Options: ");
System.out.println();
System.out.println(" --Camera= Opens the specified camera using WebcamCapture ID");
System.out.println(" or device string.");
System.out.println(" --Resolution=: Specifies camera image resolution.");
System.out.println();
System.out.println("Calibration Parameters:");
System.out.println();
System.out.println(" --ZeroSkew= Can it assume zero skew?");
System.out.println(" DEFAULT: true");
System.out.println(" --NumRadial= Number of radial coefficients");
System.out.println(" DEFAULT: 2");
System.out.println(" --Tangential= Should it include tangential terms?");
System.out.println(" DEFAULT: false");
System.out.println();
System.out.println("Fiducial Types:");
System.out.println(" CHESSBOARD");
System.out.println(" SQUAREGRID");
System.out.println();
System.out.println("Flags for CHESSBOARD:");
System.out.println(" --Grid=: Specifies number of rows and columns in the target");
System.out.println();
System.out.println("Flags for SQUAREGRID:");
System.out.println(" --Grid=: Specifies number of black square rows and columns in the target");
System.out.println(" --SquareSpace=: Specifies side of a square and space between square");
System.out.println(" Only the ratio matters.");
System.out.println(" Default: 1:1 square = 1 and space = 1");
System.out.println();
}
public void parse( String []args ) {
if( args.length < 1 ) {
throw new RuntimeException("Must specify some arguments");
}
cameraId = -1; // override default value of zero so that its easy to tell if a camera was slected
for( int i = 0; i < args.length; i++ ) {
String arg = args[i];
if( arg.startsWith("--") ) {
if (!checkCameraFlag(arg)) {
splitFlag(arg);
if( flagName.compareToIgnoreCase("Directory") == 0 ) {
inputDirectory = parameters;
inputType = InputType.IMAGE;
} else if( flagName.compareToIgnoreCase("Visualize") == 0 ) {
visualize = Boolean.parseBoolean(parameters);
} else if( flagName.compareToIgnoreCase("ZeroSkew") == 0 ) {
zeroSkew = Boolean.parseBoolean(parameters);
} else if( flagName.compareToIgnoreCase("NumRadial") == 0 ) {
numRadial = Integer.parseInt(parameters);
} else if( flagName.compareToIgnoreCase("Tangential") == 0 ) {
tangential = Boolean.parseBoolean(parameters);
} else {
throw new RuntimeException("Unknown input option " + flagName);
}
}
} else if( arg.compareToIgnoreCase("CHESSBOARD") == 0 ) {
parseChessboard(i + 1,args);
break;
} else if( arg.compareToIgnoreCase("SQUAREGRID") == 0 ) {
parseSquareGrid(i + 1, args);
break;
} else if( i == 0 ) {
outputFileName = arg;
} else {
throw new RuntimeException("Unknown fiducial type "+arg);
}
}
}
protected void parseChessboard( int index , String []args ) {
int numRows=0,numColumns=0;
for(; index < args.length; index++ ) {
String arg = args[index];
if( !arg.startsWith("--") ) {
throw new RuntimeException("Expected flags for chessboard. Should start with '--'");
}
splitFlag(arg);
if( flagName.compareToIgnoreCase("Grid") == 0 ) {
String words[] = parameters.split(":");
if( words.length != 2 )throw new RuntimeException("Expected two values for rows and columns");
numRows = Integer.parseInt(words[0]);
numColumns = Integer.parseInt(words[1]);
} else {
throw new RuntimeException("Unknown image option "+flagName);
}
}
if( numRows <= 0 || numColumns <= 0) {
throw new RuntimeException("Rows and columns must be specified and > 0");
}
System.out.println("chessboard: "+numRows+" x "+numColumns);
ConfigChessboard config = new ConfigChessboard(numRows, numColumns, 1);
detector = FactoryCalibrationTarget.detectorChessboard(config);
}
protected void parseSquareGrid( int index , String []args ) {
int numRows=0,numColumns=0;
double square=1,space=1;
for(; index < args.length; index++ ) {
String arg = args[index];
if( !arg.startsWith("--") ) {
throw new RuntimeException("Expected flags for square grid. Should start with '--'");
}
splitFlag(arg);
if( flagName.compareToIgnoreCase("Grid") == 0 ) {
String words[] = parameters.split(":");
if (words.length != 2) throw new RuntimeException("Expected two values for rows and columns");
numRows = Integer.parseInt(words[0]);
numColumns = Integer.parseInt(words[1]);
} else if( flagName.compareToIgnoreCase("SquareSpace") == 0 ) {
String words[] = parameters.split(":");
if( words.length != 2 )throw new RuntimeException("Expected two values for square and space");
square = Double.parseDouble(words[0]);
space = Double.parseDouble(words[1]);
} else {
throw new RuntimeException("Unknown image option "+flagName);
}
}
if( numRows <= 0 || numColumns <= 0) {
throw new RuntimeException("Rows and columns must be specified and > 0");
}
if( square <= 0 || space <= 0) {
throw new RuntimeException("square and space width must be specified and > 0");
}
System.out.println("squaregrid: "+numRows+" x "+numColumns+" square/space = "+(square/space));
ConfigSquareGrid config = new ConfigSquareGrid(numRows, numColumns, square,space);
detector = FactoryCalibrationTarget.detectorSquareGrid(config);
}
public void process() {
if( detector == null ) {
printHelp();
System.out.println();
System.err.println("Must specify the type of fiducial to use for calibration!");
System.exit(0);
}
switch( inputType ) {
case VIDEO: throw new RuntimeException("Calibration from video not supported");
case IMAGE:
handleDirectory();
break;
case WEBCAM:
handleWebcam();
break;
default:
printHelp();
System.out.println();
System.err.println("Input method is not specified");
System.exit(0);
break;
}
}
protected void handleDirectory() {
final CalibrateMonoPlanar calibrationAlg = new CalibrateMonoPlanar(detector);
calibrationAlg.configure( zeroSkew, numRadial, tangential);
File directory = new File(inputDirectory);
if( !directory.exists() ) {
System.err.println("Input directory doesn't exist!");
System.err.println(" "+inputDirectory);
System.exit(0);
}
List files = Arrays.asList(directory.listFiles());
Collections.sort(files);
final MonoPlanarPanel gui = visualize ? new MonoPlanarPanel() : null;
if( files.isEmpty() ) {
System.err.println("No image files found!");
System.err.println(inputDirectory);
System.exit(0);
}
boolean first = true;
for( File f : files ){
if( f.isDirectory() || f.isHidden())
continue;
BufferedImage buffered = UtilImageIO.loadImage(f.getPath());
if( buffered == null )
continue;
GrayF32 image = ConvertBufferedImage.convertFrom(buffered,(GrayF32)null);
if( gui != null ) {
gui.addImage(f.getName(),buffered);
if( first ) {
first = false;
ShowImages.showWindow(gui,"Monocular Calibration",true);
}
}
if( !calibrationAlg.addImage(image) )
System.err.println("Failed to detect target in "+f.getName());
}
// process and compute intrinsic parameters
final IntrinsicParameters intrinsic = calibrationAlg.process();
if( gui != null ) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
gui.setObservations(calibrationAlg.getObservations());
gui.setResults(calibrationAlg.getErrors());
gui.setCalibration(calibrationAlg.getZhangParam());
gui.setCorrection(intrinsic);
gui.repaint();
}
});
}
// save results to a file and print out
UtilIO.saveXML(intrinsic,outputFileName);
calibrationAlg.printStatistics();
System.out.println();
System.out.println("--- Intrinsic Parameters ---");
System.out.println();
intrinsic.print();
}
/**
* Captures calibration data live using a webcam and a GUI to assist the user
*/
public void handleWebcam() {
final Webcam webcam = openSelectedCamera();
if( desiredWidth > 0 && desiredHeight > 0 )
UtilWebcamCapture.adjustResolution(webcam, desiredWidth, desiredHeight);
webcam.open();
// close the webcam gracefully on exit
Runtime.getRuntime().addShutdownHook(new Thread(){public void run(){
if(webcam.isOpen()){System.out.println("Closing webcam");webcam.close();}}});
ComputeGeometryScore quality = new ComputeGeometryScore(zeroSkew,detector.getLayout());
AssistedCalibrationGui gui = new AssistedCalibrationGui(webcam.getViewSize());
JFrame frame = ShowImages.showWindow(gui, "Webcam Calibration", true);
GrayF32 gray = new GrayF32(webcam.getViewSize().width,webcam.getViewSize().height);
AssistedCalibration assisted = new AssistedCalibration(detector,quality,gui,OUTPUT_DIRECTORY, IMAGE_DIRECTORY);
assisted.init(gray.width,gray.height);
BufferedImage image;
while( (image = webcam.getImage()) != null && !assisted.isFinished()) {
ConvertBufferedImage.convertFrom(image, gray);
try {
assisted.process(gray,image);
} catch( RuntimeException e ) {
System.err.println("BUG!!! saving image to crash_image.png");
UtilImageIO.saveImage(image, "crash_image.png");
throw e;
}
}
webcam.close();
if( assisted.isFinished() ) {
frame.setVisible(false);
inputDirectory = new File(OUTPUT_DIRECTORY, IMAGE_DIRECTORY).getPath();
outputFileName = new File(OUTPUT_DIRECTORY, "intrinsic.xml").getPath();
handleDirectory();
}
}
public static void main(String[] args) {
CameraCalibration app = new CameraCalibration();
try {
app.parse(args);
} catch( RuntimeException e ) {
app.printHelp();
System.out.println();
System.out.println(e.getMessage());
System.exit(0);
}
app.process();
}
}
