How can I convert a byte array to a bitmap and stream the images through a web server?

Question

The project I am working on is capturing a frame from a security camera, with the help of Arduino UNO and Video Experimenter shield . Then I am sending the frame as byte arrays through a serial port. I would like to ask, how could I, with Java, convert back this byte arrays to an image, and stream this image - or even make this images a video and then stream it - through a web server?

The code I have stacked with is this:

//Handle an event on the serial port. Read the data and save the image.

public synchronized void serialEvent(SerialPortEvent oEvent) {

    if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {

        try {
            System.out.println("Got it!");
            int available = input.available();
            byte[] chunk = new byte[available];
            input.read(chunk, 0, available);
            InputStream in = new ByteArrayInputStream(chunk);
            BufferedImage image = ImageIO.read(in);
            ImageIO.write(image, "BMP", new File ("/home/zuss/images/image.BMP"));

        } catch (Exception e) {
            System.err.println(e.toString());
        } 
     }
}

That returns to my terminal window: java.lang.IllegalArgumentException: image == null! continuously as long as arduino is sending data to the serial port.

Answer 1

Your code should look something like this:

InputStream in = new ByteArrayInputStream(chunk);
OutputStream out = new FileOutputStream(new File ("/home/zuss/images/image.BMP"));
byte[] buffer = new byte[4096];
int read = in.read(buffer);
while(read >= 0 ) {
    out.write(buffer, 0, read);
    read = in.read(buffer);
}