Image processing

Question

Basically, I have a camera chip (camera module: C3038, uses the OmniVisions CMOS image sensor OV6630), connected to a PC via an RS232 line. I want to read image data in a Java program that is in this format (according to the camera specification):

Data format - YCrCb 4: 2: 2, GRB 4: 2: 2, RGB Raw Data p>

Any clues on how to do this?

My implementation:

import gnu.io.CommPortIdentifier;
import gnu.io.PortInUseException;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import gnu.io.UnsupportedCommOperationException;

import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.imageio.*;

public class SimpleRead1 implements Runnable, SerialPortEventListener {
static CommPortIdentifier portId;
static Enumeration portList;

InputStream inputStream;
SerialPort serialPort;
Thread readThread;
byte [] readBuffer;
static byte [] storeBuffer;

public SimpleRead1() {
    try {
        serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
    }catch (PortInUseException e) {System.out.println(e);}

    try {
        inputStream = serialPort.getInputStream();
    }catch (IOException e) {System.out.println(e);}

    try {
        serialPort.addEventListener(this);
    } catch (TooManyListenersException e) {System.out.println(e);}

    serialPort.notifyOnDataAvailable(true);

    try {
        serialPort.setSerialPortParams(9600,
            SerialPort.DATABITS_8,
            SerialPort.STOPBITS_1,
            SerialPort.PARITY_NONE);
    } catch (UnsupportedCommOperationException e) {System.out.println(e);}

    readThread = new Thread(this);
    readThread.start();
}

public void run() {
    try {
        Thread.sleep(20000);
    } catch (InterruptedException e) {System.out.println(e);}
}

@Override
public void serialEvent(SerialPortEvent event){
    switch(event.getEventType()) {
    case SerialPortEvent.BI:
    case SerialPortEvent.OE:
    case SerialPortEvent.FE:
    case SerialPortEvent.PE:
    case SerialPortEvent.CD:
    case SerialPortEvent.CTS:
    case SerialPortEvent.DSR:
    case SerialPortEvent.RI:
    case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
        break;
    case SerialPortEvent.DATA_AVAILABLE:
        readBuffer = new byte[Integer.MAX_VALUE];

        try {
            while (inputStream.available() > 0) {

                int numBytes = inputStream.read(readBuffer);
                System.out.print(new String(readBuffer));
            }
           } catch (IOException e) {e.printStackTrace();}

        InputStream in = new ByteArrayInputStream(readBuffer);
        BufferedImage image = null;

        try {
            image = ImageIO.read(in);
        } catch (IOException e) {e.printStackTrace();}

        //GUI for displaying image
        ImageIcon imageIcon = new ImageIcon(image);
        JLabel label = new JLabel();
        label.setIcon(imageIcon);
        JFrame frame = new JFrame("image display");
        frame.getContentPane().add(label,BorderLayout.CENTER);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);                       
        break;
    }
}

public static void main(String[] args) throws Exception {
    portList = CommPortIdentifier.getPortIdentifiers();

    while (portList.hasMoreElements()) {
        portId = (CommPortIdentifier) portList.nextElement();
        if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
             if (portId.getName().equals("COM7")) {
        //                if (portId.getName().equals("/dev/term/a")) {
                SimpleRead1 reader = new SimpleRead1();
           }
        }
    }
}
}

Answer 1

Unfortunately, Java does not support serial ports on its own - for this you need an external library. I would suggest taking a look at the RXTX library , which these days seems a little defacto standard.

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EDIT:

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Answer 2

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