bgslibrary.Utils.java Source code

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Here is the source code for bgslibrary.Utils.java

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/*
This file is part of BGSLibrary.
    
BGSLibrary is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
BGSLibrary is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with BGSLibrary.  If not, see <http://www.gnu.org/licenses/>.
 */
package bgslibrary;

import java.awt.FlowLayout;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.math.BigInteger;
import java.security.SecureRandom;
import java.util.UUID;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import org.opencv.core.Mat;
import org.opencv.imgcodecs.Imgcodecs;

public class Utils {
    static final private SecureRandom random = new SecureRandom();

    static final public String nextSessionId() {
        return new BigInteger(130, random).toString(32);
    }

    static final public String nextUUID() {
        return UUID.randomUUID().toString();
    }

    static final public BufferedImage toBufferedImage(Mat m) {
        int type = BufferedImage.TYPE_BYTE_GRAY;
        if (m.channels() > 1)
            type = BufferedImage.TYPE_3BYTE_BGR;
        int bufferSize = m.channels() * m.cols() * m.rows();
        byte[] b = new byte[bufferSize];
        m.get(0, 0, b); // get all the pixels
        BufferedImage image = new BufferedImage(m.cols(), m.rows(), type);
        final byte[] targetPixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
        System.arraycopy(b, 0, targetPixels, 0, b.length);
        return image;
    }

    static final public void imshow(Mat image) {
        try {
            BufferedImage bufImage = toBufferedImage(image);
            JFrame frame = new JFrame("Image");
            frame.getContentPane().setLayout(new FlowLayout());
            frame.getContentPane().add(new JLabel(new ImageIcon(bufImage)));
            frame.pack();
            frame.setSize(image.width() + 40, image.height() + 60);
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    static final public void writeImage(Mat image, String fileName) {
        //System.out.println(String.format("Writing image at %s", fileName));
        Imgcodecs.imwrite(fileName, image);
    }

    static final public String[] generalConcatAll(String[]... jobs) {
        int len = 0;
        for (final String[] job : jobs)
            len += job.length;

        final String[] result = new String[len];

        int currentPos = 0;
        for (final String[] job : jobs) {
            System.arraycopy(job, 0, result, currentPos, job.length);
            currentPos += job.length;
        }

        return result;
    }
}