Example usage for org.opencv.core Mat channels

Introduction

In this page you can find the example usage for org.opencv.core Mat channels.

Prototype

public int channels() 

Source Link

Usage

From source file:de.hftl_projekt.ict.MainActivity.java

/**
 * method to reduce the color (quantize) the given matrix (image)
 * @param image input matrix/*from  ww  w  .  ja  v a 2s .  c  o  m*/
 * @return modified input matrix
 */
public Mat reduceColors(Mat image) {
    if (channels.size() == 0) {
        for (int i = 0; i < image.channels(); i++) {
            Mat channel = new Mat(); // fill array with a matrix for each channel
            channels.add(channel);
        }

    }
    int i = 0;
    // process each channel individually
    for (Mat c : channels) {
        Core.extractChannel(image, c, i);
        // binary quantization (set threshold so each color (R, G, B) can have the value (0 or 255) )
        // and using the Otsu algorithm to optimize the quantization
        Imgproc.threshold(c, c, 0, 255, Imgproc.THRESH_BINARY_INV + Imgproc.THRESH_OTSU);
        i++;
    }
    Core.merge(channels, image); // put the channel back together
    return image;
}

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From source file:depthDataFromStereoCamsOpenCV.ProcessImages.java

/**
 * Mat2BufferedImage//from w  ww . ja  v  a  2s.  co  m
 * @param Mat m
 * @return BufferedImage
 */

public static BufferedImage Mat2BufferedImage(Mat m) {
    // source: http://answers.opencv.org/question/10344/opencv-java-load-image-to-gui/
    // Fastest code
    // The output can be assigned either to a BufferedImage or to an Image

    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;

}

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From source file:detectiontest.ImageDisplayer.java

public static BufferedImage toBufferedImage(Mat m) {
    int type = BufferedImage.TYPE_BYTE_GRAY;
    if (m.channels() > 1) {
        type = BufferedImage.TYPE_3BYTE_BGR;
    }/*w w w  . j  a  va  2  s  .c  om*/
    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;
}

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From source file:dfmDrone.examples.fitEllipseExample.java

public static Image 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;
}

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From source file:digimesh.xbee.gui.MeshGui.java

private BufferedImage Mat2BufferedImage(Mat m) {
    int type = BufferedImage.TYPE_BYTE_GRAY;
    if (m.channels() > 1) {
        type = BufferedImage.TYPE_3BYTE_BGR;
    }/*from   ww  w . j  a v a2  s  .  co  m*/
    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;
}

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From source file:digitalassistant.Panel.java

/**
 * Converts/writes a Mat into a BufferedImage.
 *
 * @param matrix Mat of type CV_8UC3 or CV_8UC1
 * @return BufferedImage of type TYPE_3BYTE_BGR or TYPE_BYTE_GRAY
 *///from  w w w. j  a  va2  s.  c o m
public BufferedImage matToBufferedImage(Mat matrix) {
    int cols = matrix.cols();
    int rows = matrix.rows();
    int elemSize = (int) matrix.elemSize();
    byte[] data = new byte[cols * rows * elemSize];
    int type;
    matrix.get(0, 0, data);
    switch (matrix.channels()) {
    case 1:
        type = BufferedImage.TYPE_BYTE_GRAY;
        break;
    case 3:
        type = BufferedImage.TYPE_3BYTE_BGR;
        // bgr to rgb  
        byte b;
        for (int i = 0; i < data.length; i = i + 3) {
            b = data[i];
            data[i] = data[i + 2];
            data[i + 2] = b;
        }
        break;
    default:
        return null;
    }
    BufferedImage image = new BufferedImage(cols, rows, type);
    image.getRaster().setDataElements(0, 0, cols, rows, data);
    return image;
}

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From source file:digitalassistant.Panel.java

public BufferedImage matToBufferedImage(Mat matrix) {
    int cols = matrix.cols();
    int rows = matrix.rows();
    int elemSize = (int) matrix.elemSize();
    byte[] data = new byte[cols * rows * elemSize];
    int type;/*w ww.  ja  va2s .co  m*/
    matrix.get(0, 0, data);
    switch (matrix.channels()) {
    case 1:
        type = BufferedImage.TYPE_BYTE_GRAY;
        break;
    case 3:
        type = BufferedImage.TYPE_3BYTE_BGR;
        // bgr to rgb  
        byte b;
        for (int i = 0; i < data.length; i = i + 3) {
            b = data[i];
            data[i] = data[i + 2];
            data[i + 2] = b;
        }
        break;
    default:
        return null;
    }
    BufferedImage image = new BufferedImage(cols, rows, type);
    image.getRaster().setDataElements(0, 0, cols, rows, data);
    return image;
}

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From source file:edu.wpi.cscore.RawCVMatSource.java

License:Open Source License

/**
 * Put an OpenCV image and notify sinks.
 *
 * <p>Only 8-bit single-channel or 3-channel (with BGR channel order) images
 * are supported. If the format, depth or channel order is different, use
 * Mat.convertTo() and/or cvtColor() to convert it first.
 *
 * @param image OpenCV image/*  w  w  w  . j  av  a  2s.co  m*/
 */
public void putFrame(Mat image) {
    int channels = image.channels();
    if (channels != 1 && channels != 3) {
        throw new VideoException("Unsupported Image Type");
    }
    int imgType = channels == 1 ? PixelFormat.kGray.getValue() : PixelFormat.kBGR.getValue();
    CameraServerJNI.putRawSourceFrame(m_handle, image.dataAddr(), image.width(), image.height(), imgType,
            (int) image.total() * channels);
}

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From source file:facedetection.FaceDetector.java

public BufferedImage mat2BufferedImage(Mat m) {
    int type = BufferedImage.TYPE_BYTE_GRAY;
    if (m.channels() > 1) {
        type = BufferedImage.TYPE_3BYTE_BGR;
    }/* w w  w .  java  2 s.c  o  m*/
    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;

}

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From source file:faceDetectionV1.FaceDetection.java

private BufferedImage convertMatToImage(Mat matrix) {
    int type = BufferedImage.TYPE_BYTE_GRAY;

    if (matrix.channels() > 1) {
        type = BufferedImage.TYPE_3BYTE_BGR;
    }/*from   w w  w.  jav  a  2s.c  o  m*/

    int bufferSize = matrix.channels() * matrix.cols() * matrix.rows();
    byte bytes[] = new byte[bufferSize];
    matrix.get(0, 0, bytes);
    BufferedImage image = new BufferedImage(matrix.cols(), matrix.rows(), type);
    final byte targetsize[] = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
    System.arraycopy(bytes, 0, targetsize, 0, bytes.length);
    return image;
}

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