Acquire and save images at high frame rates

I am attempting to acquire and save images at a rate of 3000 fps for approximately 100 ms using a JAI 6740GE GigE camera, LabView 2011, and IMAQdx. I can acquire the images at the necessary rates, but am dropping images when I try to save them. The current test program I am working with contains a producer loop for acquiring the images, converting them into an array, and putting them into a queue, and a consumer loop to write the arrays to a TDMS file. Currently I can acquire and save the images at a rate of approximately 1200 fps before I begin losing a few frames. The code is attached below. I would appreciate any ideas to be able to save the images without dropping frames.
Attachments:
Trigger Image to AVI faster.vi ‏38 KB

Hi Rox,
How are you verifying that you are loosing the frames during the saving and not during the acquisition? Are you able to determine where you are dropping frames? Is it at the beginning, the end or randomly? Thank you!
Regards,
Kira T

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import java.io.*;
import java.awt.*;
import java.net.*;
import java.awt.event.*;
import java.util.Vector;
import javax.media.*;
import javax.media.rtp.*;
import javax.media.rtp.event.*;
import javax.media.rtp.rtcp.*;
import javax.media.protocol.*;
import javax.media.protocol.DataSource;
import javax.media.format.AudioFormat;
import javax.media.format.VideoFormat;
import javax.media.Format;
import javax.media.format.FormatChangeEvent;
import javax.media.control.BufferControl;
import javax.media.control.FrameGrabbingControl;
import javax.imageio.ImageIO;
import java.util.Date;
import javax.media.util.BufferToImage;
import java.awt.image.BufferedImage;
* AVReceive2 to receive RTP transmission using the new RTP API.
public class AVReceive2 implements ReceiveStreamListener, SessionListener,
ControllerListener
public static DataSource ds2, ds, ds3;
String sessions[] = null;
RTPManager mgrs[] = null;
Vector playerWindows = null;
boolean dataReceived = false;
Object dataSync = new Object();
public AVReceive2(String sessions[]) {
this.sessions = sessions;
public static DataSource getData() {
return ds;
protected boolean initialize() {
try {
InetAddress ipAddr;
SessionAddress localAddr = new SessionAddress();
SessionAddress destAddr;
mgrs = new RTPManager[sessions.length];
playerWindows = new Vector();
SessionLabel session;
// Open the RTP sessions.
for (int i = 0; i < sessions.length; i++) {
// Parse the session addresses.
try {
session = new SessionLabel(sessions);
} catch (IllegalArgumentException e) {
System.err.println("Failed to parse the session address given: " + sessions[i]);
return false;
System.err.println(" - Open RTP session for: addr: " + session.addr + " port: " + session.port + " ttl: " + session.ttl);
mgrs[i] = (RTPManager) RTPManager.newInstance();
mgrs[i].addSessionListener(this);
mgrs[i].addReceiveStreamListener(this);
ipAddr = InetAddress.getByName(session.addr);
if( ipAddr.isMulticastAddress()) {
// local and remote address pairs are identical:
localAddr= new SessionAddress( ipAddr,
session.port,
session.ttl);
destAddr = new SessionAddress( ipAddr,
session.port,
session.ttl);
} else {
localAddr= new SessionAddress( InetAddress.getLocalHost(),
session.port);
destAddr = new SessionAddress( ipAddr, session.port);
mgrs[i].initialize( localAddr);
// You can try out some other buffer size to see
// if you can get better smoothness.
BufferControl bc = (BufferControl)mgrs[i].getControl("javax.media.control.BufferControl");
if (bc != null)
bc.setBufferLength(350);
mgrs[i].addTarget(destAddr);
} catch (Exception e){
System.err.println("Cannot create the RTP Session: " + e.getMessage());
return false;
// Wait for data to arrive before moving on.
long then = System.currentTimeMillis();
long waitingPeriod = 30000; // wait for a maximum of 30 secs.
try{
synchronized (dataSync) {
while (!dataReceived &&
System.currentTimeMillis() - then < waitingPeriod) {
if (!dataReceived)
System.err.println(" - Waiting for RTP data to arrive...");
dataSync.wait(1000);
} catch (Exception e) {}
if (!dataReceived) {
System.err.println("No RTP data was received.");
close();
return false;
return true;
public boolean isDone() {
//return playerWindows.size() == 0;
return false;
* Close the players and the session managers.
protected void close() {
for (int i = 0; i < playerWindows.size(); i++) {
try {
((PlayerWindow)playerWindows.elementAt(i)).close();
} catch (Exception e) {}
playerWindows.removeAllElements();
// close the RTP session.
for (int i = 0; i < mgrs.length; i++) {
if (mgrs[i] != null) {
mgrs[i].removeTargets( "Closing session from AVReceive2");
mgrs[i].dispose();
mgrs[i] = null;
PlayerWindow find(Player p) {
for (int i = 0; i < playerWindows.size(); i++) {
PlayerWindow pw = (PlayerWindow)playerWindows.elementAt(i);
if (pw.player == p)
return pw;
return null;
PlayerWindow find(ReceiveStream strm) {
for (int i = 0; i < playerWindows.size(); i++) {
PlayerWindow pw = (PlayerWindow)playerWindows.elementAt(i);
if (pw.stream == strm)
return pw;
return null;
* SessionListener.
public synchronized void update(SessionEvent evt) {
if (evt instanceof NewParticipantEvent) {
Participant p = ((NewParticipantEvent)evt).getParticipant();
System.err.println(" - A new participant had just joined: " + p.getCNAME());
* ReceiveStreamListener
public synchronized void update( ReceiveStreamEvent evt) {
RTPManager mgr = (RTPManager)evt.getSource();
Participant participant = evt.getParticipant();     // could be null.
ReceiveStream stream = evt.getReceiveStream(); // could be null.
if (evt instanceof RemotePayloadChangeEvent) {
System.err.println(" - Received an RTP PayloadChangeEvent.");
System.err.println("Sorry, cannot handle payload change.");
System.exit(0);
else if (evt instanceof NewReceiveStreamEvent) {
try {
stream = ((NewReceiveStreamEvent)evt).getReceiveStream();
//DataSource
ds2 = stream.getDataSource(); // this original cant be used now
// ds is used to play video
ds = Manager.createCloneableDataSource(ds2);
// ds3 is used to record video
ds3 = ((SourceCloneable)ds).createClone();
// Find out the formats.
RTPControl ctl = (RTPControl)ds.getControl("javax.media.rtp.RTPControl");
if (ctl != null){
System.err.println(" - Recevied new RTP stream: " + ctl.getFormat());
} else
System.err.println(" - Recevied new RTP stream");
if (participant == null)
System.err.println(" The sender of this stream had yet to be identified.");
else {
System.err.println(" The stream comes from: " + participant.getCNAME());
// create a player by passing datasource to the Media Manager
Player p = javax.media.Manager.createPlayer(ds);
if (p == null)
return;
p.addControllerListener(this);
p.realize();
PlayerWindow pw = new PlayerWindow(p, stream);
playerWindows.addElement(pw);
// Notify intialize() that a new stream had arrived.
synchronized (dataSync) {
dataReceived = true;
dataSync.notifyAll();
} catch (Exception e) {
e.printStackTrace();
return;
else if (evt instanceof StreamMappedEvent) {
if (stream != null && stream.getDataSource() != null) {
DataSource ds = stream.getDataSource();
// Find out the formats.
RTPControl ctl = (RTPControl)ds.getControl("javax.media.rtp.RTPControl");
System.err.println(" - The previously unidentified stream ");
if (ctl != null)
System.err.println(" " + ctl.getFormat());
System.err.println(" had now been identified as sent by: " + participant.getCNAME());
else if (evt instanceof ByeEvent) {
System.err.println(" - Got \"bye\" from: " + participant.getCNAME());
PlayerWindow pw = find(stream);
if (pw != null) {
pw.close();
playerWindows.removeElement(pw);
* ControllerListener for the Players.
public synchronized void controllerUpdate(ControllerEvent ce) {
Player p = (Player)ce.getSourceController();
if (p == null)
return;
// Get this when the internal players are realized.
if (ce instanceof RealizeCompleteEvent) {
PlayerWindow pw = find(p);
if (pw == null) {
// Some strange happened.
System.err.println("Internal error!");
System.exit(-1);
pw.initialize();
pw.setVisible(true);
p.start();
try {
// make it wait so that video can start otherwise image will be null. u must call this method with a button
Thread.sleep(2500);
catch (Exception e) {
e.printStackTrace();
// Grab a frame from the capture device
FrameGrabbingControl frameGrabber = (FrameGrabbingControl) p.getControl(
"javax.media.control.FrameGrabbingControl");
Buffer buf = frameGrabber.grabFrame();
// Convert frame to an buffered image so it can be processed and saved
Image img = (new BufferToImage( (VideoFormat) buf.getFormat()).
createImage(buf));
BufferedImage buffImg = new BufferedImage(img.getWidth(null),
img.getHeight(null),
BufferedImage.TYPE_INT_RGB);
Graphics2D g = buffImg.createGraphics();
g.drawImage(img, null, null);
// Overlay curent time on image
g.setColor(Color.RED);
g.setFont(new Font("Verdana", Font.BOLD, 12));
g.drawString( (new Date()).toString(), 10, 25);
try { // Save image to disk as PNG
ImageIO.write(buffImg, "jpeg", new File("c:\\webcam.jpg"));
catch (Exception e) {
e.printStackTrace();
// this will record the video for a few seconds. this should also be called properly by menu or buttons
record(ds3);
if (ce instanceof ControllerErrorEvent) {
p.removeControllerListener(this);
PlayerWindow pw = find(p);
if (pw != null) {
pw.close();
playerWindows.removeElement(pw);
System.err.println("AVReceive2 internal error: " + ce);
* A utility class to parse the session addresses.
class SessionLabel {
public String addr = null;
public int port;
public int ttl = 1;
SessionLabel(String session) throws IllegalArgumentException {
int off;
String portStr = null, ttlStr = null;
if (session != null && session.length() > 0) {
while (session.length() > 1 && session.charAt(0) == '/')
session = session.substring(1);
// Now see if there's a addr specified.
off = session.indexOf('/');
if (off == -1) {
if (!session.equals(""))
addr = session;
} else {
addr = session.substring(0, off);
session = session.substring(off + 1);
// Now see if there's a port specified
off = session.indexOf('/');
if (off == -1) {
if (!session.equals(""))
portStr = session;
} else {
portStr = session.substring(0, off);
session = session.substring(off + 1);
// Now see if there's a ttl specified
off = session.indexOf('/');
if (off == -1) {
if (!session.equals(""))
ttlStr = session;
} else {
ttlStr = session.substring(0, off);
if (addr == null)
throw new IllegalArgumentException();
if (portStr != null) {
try {
Integer integer = Integer.valueOf(portStr);
if (integer != null)
port = integer.intValue();
} catch (Throwable t) {
throw new IllegalArgumentException();
} else
throw new IllegalArgumentException();
if (ttlStr != null) {
try {
Integer integer = Integer.valueOf(ttlStr);
if (integer != null)
ttl = integer.intValue();
} catch (Throwable t) {
throw new IllegalArgumentException();
* GUI classes for the Player.
class PlayerWindow extends Frame {
Player player;
ReceiveStream stream;
PlayerWindow(Player p, ReceiveStream strm) {
player = p;
stream = strm;
public void initialize() {
add(new PlayerPanel(player));
public void close() {
player.close();
setVisible(false);
dispose();
public void addNotify() {
super.addNotify();
pack();
* GUI classes for the Player.
class PlayerPanel extends Panel {
Component vc, cc;
PlayerPanel(Player p) {
setLayout(new BorderLayout());
if ((vc = p.getVisualComponent()) != null)
add("Center", vc);
if ((cc = p.getControlPanelComponent()) != null)
add("South", cc);
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int w = 0, h = 0;
if (vc != null) {
Dimension size = vc.getPreferredSize();
w = size.width;
h = size.height;
if (cc != null) {
Dimension size = cc.getPreferredSize();
if (w == 0)
w = size.width;
h += size.height;
if (w < 160)
w = 160;
return new Dimension(w, h);
public void record(DataSource ds) {
Format formats[] = new Format[1];
formats[0] = new VideoFormat(VideoFormat.CINEPAK);
FileTypeDescriptor outputType =
new FileTypeDescriptor("video.x_msvideo");
Processor p = null;
try {
p = Manager.createRealizedProcessor(new ProcessorModel(ds,formats,
outputType));
} catch (IOException e) {
e.printStackTrace();
} catch (NoProcessorException e) {
e.printStackTrace();
} catch (CannotRealizeException e) {
e.printStackTrace();
// get the output of the processor
DataSource source = p.getDataOutput();
// create a File protocol MediaLocator with the location
// of the file to
// which bits are to be written
MediaLocator dest = new MediaLocator("file://vvv.mpeg");
// create a datasink to do the file writing & open the
// sink to make sure
// we can write to it.
DataSink filewriter = null;
try {
filewriter = Manager.createDataSink(source, dest);
filewriter.open();
} catch (NoDataSinkException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
// now start the filewriter and processor
try {
filewriter.start();
} catch (IOException e) {
e.printStackTrace();
p.start();
try {
Thread.sleep(10000);
}catch(Exception e) { }
p.close();
filewriter.close();
// stop and close the processor when done capturing...
// close the datasink when EndOfStream event is received...
public static void main(String argv[]) {
//     if (argv.length == 0)
//     prUsage();
String[] a = new String[1];
a[0] = ("192.168.0.45/4002");
AVReceive2 avReceive = new AVReceive2(a);
if (!avReceive.initialize()) {
System.err.println("Failed to initialize the sessions.");
System.exit(-1);
// Check to see if AVReceive2 is done.
try {
while (!avReceive.isDone())
Thread.sleep(1000);
} catch (Exception e) {}
System.err.println("Exiting AVReceive2");
static void prUsage() {
System.err.println("Usage: AVReceive2 <session> <session> ...");
System.err.println(" <session>: <address>/<port>/<ttl>");
//System.exit(0);
}// end of AVReceive2
so here the code. all messed up. coz i have just completed it and havent worked on interface or formatting this code properly (didnt have much time). but hope it will help. ask me if u have any questions. dont want others to have those basic problems that i had to face.

u did a good effort for the JMF beginners i appreciate that....thanks i lot....i need you help in a project in
which i have to connect to a d-link 950G IP camera and process that
mpeg-4 stream (i know there are some problems in JMF and mpeg4) and show it over applet of JFrame.
IP is 172.25.35.22
Edited by: alchemist on Jul 16, 2008 6:09 AM

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Message was edited by: EZ Jim
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HP8563E_Query_Amplitude.vi ‏37 KB

Hi,
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functionality into their applications, and all hooks are available to
make EDT API subroutine calls from drivers for third party packages,
but we do not provide the drivers ourselves. Some drivers are available
from other providers; see our Partners page.
So you will need to use the Call Library Function Node to integrate their Drivers DLL into your LV. How to save the images then in a standart format depends on the data format you get from their driver.
Using an NI Framegrabber would be easier
Christian

Read HTML tags and Save Images in web page

I had problem with reading HTML tags and save all images in that page. I can source code in web page but I dont know how to Identifly the image tag ( IMG tag ). I think i want to use string tokenizer class.
But i dont know how to use it in my problem. If any one know how to do it. reply this.

cnapagoda wrote:
I had problem with reading HTML tags and save all images in that page. I can source code in web page but I dont know how to Identifly the image tag ( IMG tag ). I think i want to use string tokenizer class.
But i dont know how to use it in my problem. If any one know how to do it. reply this.If you have a big, long string with HTML content in it you might try splitting on a regex like so:
String html = ...
String[] imgTags = html.split("<img.*?>");[http://java.sun.com/javase/6/docs/api/java/lang/String.html#split(java.lang.String)|http://java.sun.com/javase/6/docs/api/java/lang/String.html#split(java.lang.String)]
to get your image tag data and then parsing that to get the src attribute. You can either treat this problem as a big string-parsing problem, or getting some HTML DOM library and using that to structure the page as a tree for easier access.
If you want more help you'll have to show the code you have so far. We can't write this for you.

Convert image file names to labels and resizing images according to frame. Possible??

Hi all,
I have posted this question hastily in the main mac forum but then i realized it is a scripting question so I repost here.
Q1: I have a client with 700+ images who has named the images with numbers and the caption:
eg: 1.II.34. Walking down the road towards the building.tiff
This is the name of the image file itself
Is there a way to import the name of the file (possibly without the extension) and place it as a caption under the image without copying and pasting? A script maybe?
I tried the labelgraphics script. Unfortunately it returned the extension as well. I was given a solution but did not work for me since it deleted everything after the first dot on the name. This was:
in labelgraphics on line 105, change
myLabel = myLink.name
to
myLabel = myLink.name.split('.')[0]
So how can we tackle this so it deletes everything after the LAST dot?
Q2: The image files I am given are all huge tiff files. I use the full 100% of the images but in my document they have to be much smaller . They are usually scaled down to 25-35% of the original file. So I end up with huge, unneeded documents.
Is there a script that would work together with photoshop maybe?
It would need to read the frames dimensions the image is in, open the linked file inside photoshop, resize it with a specified interpolation to maybe 110% of the frame's dimensions, set the resolution (if not set) to 300 dpi save the image as a copy (or with a suffix or prefix), leave photoshop open (for the next image to be processed), relink to the new image and go to the next image
I know it sounds a lot but I was amazed by the issues people handle in this forum and thought I would give it a try
Thank you in advance
Michael

Peter thank you so much. It works like a charm.
As for Q2, I spent some time doing research and came up with a couple of scripts that sound like they could do the trick.
a) Image Transform or Rasterize
http://www.adobe.com/cfusion/exchange/index.cfm?event=extensionDetail&loc=en_us&extid=1509 022#
b) Resample Project Images to 100%
http://www.adobe.com/cfusion/exchange/index.cfm?event=extensionDetail&loc=en_us&extid=1612 518#
Still, since I am such an ignorant I do not know which one would be the proper one.
Any suggestions would be highly appreciated.
Thank you once more
Michael

Acquire and save images at high frame rates

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