Multiple image displays

Hi,
I plugged 2 USB3.0 cameras in LabVIEW, and displayed the images from both in the front panel seperately. One image display corresponds to one camera source. When I run the codes, the display windows are supposed to show separate image grabbed by the corresonding camera. However, the displays windows sometimes show the same image source from one camera and they are not stable. I guess the signals from both cameras are mixed sometimes. I have no idea how to solve this problem.Has anyone met with the same problem before?
Also, I'd like to confirm my calcultion of bandwidth. I want to plug 6 USB3.0 cameras in total eventually. They will all be set the same with resolution 1024x1280, mono8. The bandwidth of USB3.0 is 625 MB/s. Thus, the calculatin of maximum frame rate for each camera the setup could handle should be:
maximum frame rate = 625M / (1280 x 1024 x 6) = 79.4 fps. Is this right?
Thanks,
Olivia
Solved!
Go to Solution.

Hi,
I attached my vi. file here.
Thanks,
Olivia
Attachments:
double_camera.vi ‏85 KB

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Hi All,
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package com.project.utils{
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import java.awt.*;
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import java.io.*;
import java.net.*;
import java.util.*;
import javax.imageio.*;
import javax.swing.*;
import java.util.List;
public class MultiImageTest {
 public static void main(String[] args) throws IOException {
 URL url1 = new URL("http://today.java.net/jag/bio/JagHeadshot-small.jpg");
 URL url2 = new URL("http://today.java.net/jag/bio/JAG2001small.jpg");
 URL url3 = new URL("http://today.java.net/jag/Image24-small.jpeg");
 BufferedImage[] images = {ImageIO.read(url1), ImageIO.read(url2), ImageIO.read(url3)};
 display(images, "original", 0, 0);
 String[] suffixes = {"gif", "jpeg", "png", "tiff"};
 int x = 30, y = 20;
 for(int j=0; j<suffixes.length; ++j) {
 String suffix = suffixes[j];
 try {
 writeFile(images, suffix);
 display(readFile(suffix), suffix, x, y);
 x += 30;
 y += 20;
 } catch (Exception e) {
 System.err.println(suffix + ": " + e.getMessage());
 static void writeFile(BufferedImage[] images, String suffix) throws IOException {
 Iterator ws = ImageIO.getImageWritersBySuffix(suffix);
 if (!ws.hasNext())
 throw new IOException("no writer for: " + suffix);
 ImageWriter w = (ImageWriter) ws.next();
 File file = new File("temp." + suffix);
 file.delete();
 w.setOutput(ImageIO.createImageOutputStream(file));
 if (w.canWriteSequence()) {
 System.out.println("Using writeToSequence for format " + suffix);
 w.prepareWriteSequence(null);
 for(int j=0; j<images.length; ++j)
 w.writeToSequence(new IIOImage(images[j], null, null), null);
 w.endWriteSequence();
 } else {
 System.out.println("cross fingers for format " + suffix);
 for(int j=0; j<images.length; ++j)
 w.write(images[j]);
 static BufferedImage[] readFile(String suffix) throws IOException {
 Iterator rs = ImageIO.getImageReadersBySuffix(suffix);
 if (!rs.hasNext())
 throw new IOException("no reader for: " + suffix);
 ImageReader r = (ImageReader) rs.next();
 File file = new File("temp." + suffix);
 if (!file.exists())
 throw new IOException("no file: " + file.getName());
 r.setInput(ImageIO.createImageInputStream(file));
 List images = new ArrayList();
 for(int j=0; true; ++j) {
 try {
 images.add(r.read(j));
 } catch (IndexOutOfBoundsException e) {
 break;
 return (BufferedImage[]) images.toArray(new BufferedImage[images.size()]);
 static void display(BufferedImage[] images, String title, int x, int y) {
 JPanel cp = new JPanel(new GridLayout(1,0));
 for(int j=0; j<images.length; ++j)
 cp.add(new JLabel(new ImageIcon(images[j])));
 JFrame f = new JFrame(title);
 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 f.getContentPane().add(new JScrollPane(cp));
 f.pack();
 f.setLocation(x, y);
 f.setVisible(true);

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