May I receive resolution 640*480 in image LV from WEB-camera

Hello all
I have
LV7.1.1
I received
the image from WEB-camera.
WEB-camera
has resolution 640*480 but I have resolution in the Image of LV - 320*240.
May I
receive resolution 640*480 in LV
With respect.
Aleksandr

Hello,
I assume you have to change the settings of the camera and not the code in LabVIEW...
Just in case, see the attached code in LV 7.1.1 that allows to change the image resolution.
Hope this helps
When my feet touch the ground each morning the devil thinks "bloody hell... He's up again!"
Attachments:
AC_Util_ResampleImage.vi ‏126 KB

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Capture an image using the web camera from a web application

Hi All,
Could anyone please share the steps what have to be followed for capture an image using the web camera from a web application.
I have a similar requirement like this,
1) Detect the Webcam on the users machine from the web application.(To be more clear when the user clicks on 'Add Photo' tool from the web application)
2) When the user confirms to save, save the Image in users machine at some temporary location with some unique file name.
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Please share the details like, what can be used and how it can be used etc...
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1) Detect the Webcam on the users machine from the web application.(To be more clear when the user clicks on 'Add Photo' tool from the web application)There's not really any good way to do this with JMF. You'd have to somehow create a JMF web-start application that will install the native JMF binaries, and then kick off the capture device scanning code from the application, and then scan through the list of devices found to get the MediaLocator of the web cam.
2) When the user confirms to save, save the Image in users machine at some temporary location with some unique file name.You'd probably be displaying a "preview" window and then you'd just want to capture the image. There are a handful of ways you could capture the image, but it really depends on your situation.
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All things told, this application is probably more suited to be a FMJ (Freedom for Media in Java) application than a JMF application. JMF relies on native code to capture from the web cams, whereas FMJ does not.
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I would like to create a pop-up window appear from Labview Interface. In this window, I will have a slide control and an image taken from a camera. The main VI have to run while pop-up window is open. How can I do ?

When I pushed a button, this pop-up window has to appear. There will be a slide control and a picture from a camera in this window. Is it possible to make appear this windows while main VI Interface continue to run ? How can I do this ? Thank you for your answers.
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Here you go. This is simple example. Maybe not the best way, I am just
beginner in LV and still not comfortable with data flow that much. I prefer
events, so I would change this to use Event Structures.
When you click on OK button on SliderMain, it opens Slider.vi. Now both
windows are open and you can interact with both. Now if you click on OK
again with Slider.vi open, you run into problems. Only thing I did was
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vishi
"Cy" wrote in message
news:[email protected]..
> I would like to create a pop-up window appear from Labview Interface.
> In this window, I will have a slide control and an image taken from a
> camera. The main VI hav
e to run while pop-up window is open. How can I
> do ?
>
> When I pushed a button, this pop-up window has to appear. There will
> be a slide control and a picture from a camera in this window. Is it
> possible to make appear this windows while main VI Interface continue
> to run ? How can I do this ? Thank you for your answers.
> Cyril.
[Attachment SliderMain.vi, see below]
[Attachment Slider.vi, see below]
Attachments:
SliderMain.vi ‏16 KB
Slider.vi ‏11 KB

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Hi,
I don't know how to solve this problem,
but I want to ask you how you managed to get
FrameGrabbingControl which is not null.
I use Logitech QickCam and everytime when I try to get a FrameGrabbingControl from the Player it returns me null?
Can you help me?
have you any ideas why I get null?
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Run as:- java JpegImagesToMovie -w 320 -h 240 -f 30 -o file:test.avi
* @(#)JpegImagesToMovie.java     1.3 01/03/13
* Copyright (c) 1999-2001 Sun Microsystems, Inc. All Rights Reserved.
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
* Some public domain modifications by Andy Dyble for avi etc by self and from
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* Supported formats tested for compression options. This code could be much improved
* further to these amendments. Absolutely no warranties. www.exactfutures.com
import java.io.*;
import java.net.*;
import java.util.*;
import java.awt.Dimension;
import javax.media.*;
import javax.media.control.*;
import javax.media.protocol.*;
import javax.media.protocol.DataSource;
import javax.media.datasink.*;
import javax.media.format.VideoFormat;
import javax.media.format.JPEGFormat;
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     dsink.start();
     } catch (IOException e) {
     System.err.println("IO error during processing");
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     // Wait for EndOfStream event.
     waitForFileDone();
     // Cleanup.
     try {
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     } catch (Exception e) {}
     p.removeControllerListener(this);
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* Create the DataSink.
DataSink createDataSink(Processor p, MediaLocator outML) {
     DataSource ds;
     if ((ds = p.getDataOutput()) == null) {
     System.err.println("Something is really wrong: the processor does not have an output DataSource");
     return null;
     DataSink dsink;
     try {
     System.err.println("- create DataSink for: " + outML);
     dsink = Manager.createDataSink(ds, outML);
     dsink.open();
     } catch (Exception e) {
     System.err.println("Cannot create the DataSink: " + e);
     return null;
     return dsink;
Object waitSync = new Object();
boolean stateTransitionOK = true;
* Block until the processor has transitioned to the given state.
* Return false if the transition failed.
boolean waitForState(Processor p, int state) {
     synchronized (waitSync) {
     try {
          while (p.getState() < state && stateTransitionOK)
          waitSync.wait();
     } catch (Exception e) {}
     return stateTransitionOK;
* Controller Listener.
public void controllerUpdate(ControllerEvent evt) {
     if (evt instanceof ConfigureCompleteEvent ||
     evt instanceof RealizeCompleteEvent ||
     evt instanceof PrefetchCompleteEvent) {
     synchronized (waitSync) {
          stateTransitionOK = true;
          waitSync.notifyAll();
     } else if (evt instanceof ResourceUnavailableEvent) {
     synchronized (waitSync) {
          stateTransitionOK = false;
          waitSync.notifyAll();
     } else if (evt instanceof EndOfMediaEvent) {
     evt.getSourceController().stop();
     evt.getSourceController().close();
Object waitFileSync = new Object();
boolean fileDone = false;
boolean fileSuccess = true;
* Block until file writing is done.
boolean waitForFileDone() {
     synchronized (waitFileSync) {
     try {
          while (!fileDone)
          waitFileSync.wait();
     } catch (Exception e) {}
     return fileSuccess;
* Event handler for the file writer.
public void dataSinkUpdate(DataSinkEvent evt) {
     if (evt instanceof EndOfStreamEvent) {
     synchronized (waitFileSync) {
          fileDone = true;
          waitFileSync.notifyAll();
     } else if (evt instanceof DataSinkErrorEvent) {
     synchronized (waitFileSync) {
          fileDone = true;
          fileSuccess = false;
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          File file = new File("images");
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     prUsage();
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          prUsage();
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     if (frameRate < 1)
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     System.exit(0);
     JpegImagesToMovie imageToMovie = new JpegImagesToMovie();
     imageToMovie.doIt(width, height, frameRate, inputFiles, oml, outputURL);
     System.exit(0);
static void prUsage() {
     System.err.println("Usage: java JpegImagesToMovie -w <width> -h <height> -f <frame rate> -o <output URL>");// <input JPEG file 1> <input JPEG file 2> ...");
     System.exit(-1);
* Create a media locator from the given string.
static MediaLocator createMediaLocator(String url) {
     MediaLocator ml;
     if (url.indexOf(":") > 0 && (ml = new MediaLocator(url)) != null)
     return ml;
     if (url.startsWith(File.separator)) {
     if ((ml = new MediaLocator("file:" + url)) != null)
          return ml;
     } else {
     String file = "file:" + System.getProperty("user.dir") + File.separator + url;
     if ((ml = new MediaLocator(file)) != null)
          return ml;
     return null;
// Inner classes.
* A DataSource to read from a list of JPEG image files and
* turn that into a stream of JMF buffers.
* The DataSource is not seekable or positionable.
class ImageDataSource extends PullBufferDataSource {
     ImageSourceStream streams[];
     ImageDataSource(int width, int height, int frameRate, Vector images) {
     streams = new ImageSourceStream[1];
     streams[0] = new ImageSourceStream(width, height, frameRate, images);
     public void setLocator(MediaLocator source) {
     public MediaLocator getLocator() {
     return null;
     * Content type is of RAW since we are sending buffers of video
     * frames without a container format.
     public String getContentType() {
     return ContentDescriptor.RAW;
     public void connect() {
     public void disconnect() {
     public void start() {
     public void stop() {
     * Return the ImageSourceStreams.
     public PullBufferStream[] getStreams() {
     return streams;
     * We could have derived the duration from the number of
     * frames and frame rate. But for the purpose of this program,
     * it's not necessary.
     public Time getDuration() {
     return DURATION_UNKNOWN;
     public Object[] getControls() {
     return new Object[0];
     public Object getControl(String type) {
     return null;
* The source stream to go along with ImageDataSource.
class ImageSourceStream implements PullBufferStream {
     Vector images;
     int width, height;
     VideoFormat format;
     int nextImage = 0;     // index of the next image to be read.
     boolean ended = false;
     float frameRate;
     long seqNo = 0;
     public ImageSourceStream(int width, int height, int frameRate, Vector images) {
     this.width = width;
     this.height = height;
     this.images = images;
          this.frameRate = (float)frameRate;
     format = new VideoFormat(VideoFormat.JPEG,
                    new Dimension(width, height),
                    Format.NOT_SPECIFIED,
                    Format.byteArray,
                    (float)frameRate);
     * We should never need to block assuming data are read from files.
     public boolean willReadBlock() {
     return false;
byte[] input_buffer;
byte[] imgbytearray;
byte[] imgusebyte;
int camWidth = 320;
int camHeight = 240;
URL url;
long timeStamp;long timeStamp0=System.currentTimeMillis();long resultTimeStamp;
     public boolean urlFetchJPG()
          String ipcamserver = "146.176.65.10";     // examples 146.176.65.10 , 62.16.100.204 , 194.168.163.96 , 84.93.217.139 , 194.177.131.229 , 148.61.171.201
          try
               url = new URL("http://"+ipcamserver+"/axis-cgi/jpg/image.cgi?camera=&resolution=320x240".trim());
          catch(Exception e){System.out.println("Exception url "+e);}
          try
               if(input_buffer==null)input_buffer = new byte[8192];
               if(imgbytearray==null)imgbytearray = new byte[camWidth*camHeight*3];
               URLConnection uc = url.openConnection();
               uc.setUseCaches(false);
               //uc.setDoInput(true);
               //uc.setRequestProperty("accept","image/jpeg,text/html,text/plain");
               BufferedInputStream in;
               int bytes_read;
               int sumread=0;
               in = new BufferedInputStream(uc.getInputStream());
               while((bytes_read=in.read(input_buffer, 0, 8192))!=-1)
                    if(sumread+bytes_read>imgbytearray.length)
                         byte[] imgbytearraytemp = new byte[sumread+bytes_read+8192];
                         System.arraycopy(imgbytearray,0,imgbytearraytemp,0,imgbytearray.length);
                    System.arraycopy(input_buffer,0,imgbytearray,sumread,bytes_read);
                    sumread=sumread+bytes_read;
               in.close();
               imgusebyte = new byte[sumread];
               System.arraycopy(imgbytearray,0,imgusebyte,0,sumread);
          catch(Exception e){System.out.println("Exception urlFetchJPG "+e);}
          return true;
     * This is called from the Processor to read a frame worth
     * of video data.
     public void read(Buffer buf) throws IOException {
     // Check if we've finished all the frames.
     if (nextImage >= 20) //images.size())
          // We are done. Set EndOfMedia.
          System.err.println("Done reading all images.");
          buf.setEOM(true);
          buf.setOffset(0);
          buf.setLength(0);
          ended = true;
          return;
///     String imageFile = (String)images.elementAt(nextImage);
     nextImage++;
//     System.err.println(" - reading image file: " + imageFile);
     // Open a random access file for the next image.
///     RandomAccessFile raFile;
///     raFile = new RandomAccessFile(imageFile, "r");
     byte data[] = null;
     // Check the input buffer type & size.
///     if (buf.getData() instanceof byte[])
///          data = (byte[])buf.getData();
          urlFetchJPG();
          data = imgusebyte;
     // Check to see the given buffer is big enough for the frame.
///     if (data == null || data.length < raFile.length()) {
///          data = new byte[(int)raFile.length()];
          buf.setData(data);
     // Read the entire JPEG image from the file.
///     raFile.readFully(data, 0, (int)raFile.length());
//     System.err.println(" read " + raFile.length() + " bytes.");
     buf.setOffset(0);
///     buf.setLength((int)raFile.length());
          buf.setLength(data.length);
     buf.setFormat(format);
     buf.setFlags(buf.getFlags() | buf.FLAG_KEY_FRAME);
///          long time = (long)(seqNo * (1000D / frameRate) * 1000000);
          timeStamp = System.currentTimeMillis();
          resultTimeStamp = timeStamp - timeStamp0;
          long time = resultTimeStamp * 0xf4240L;
          buf.setTimeStamp(time);
          buf.setSequenceNumber(seqNo++);
     // Close the random access file.
///     raFile.close();
     * Return the format of each video frame. That will be JPEG.
     public Format getFormat() {
     return format;
     public ContentDescriptor getContentDescriptor() {
     return new ContentDescriptor(ContentDescriptor.RAW);
     public long getContentLength() {
     return 0;
     public boolean endOfStream() {
     return ended;
     public Object[] getControls() {
     return new Object[0];
     public Object getControl(String type) {
     return null;
{code}

Is it possible to animate videos and images coming from web service.

i am calling a webservice. from that i am getting response. in that i have images and videos. i took those in an array. Now i need to animate those array values. just like animating images. So please tell me is it possible to animate videos are not. if yes how?

Then, if it's not self-powered and you don't have a USB hub to power it, it's impossible.
If you DO have a hub, give it a try. If the HDD is formatted in FAT32 or other, iOS-friendly formats (NOT NTFS!), you may be able to import videos / pics from it so that you can access them as imported media files.

Best way to save images streamed from web to device?

We have an app for browsing a catalog that streams content from a web server. There is an image for each product, some in JPG format and some in PNG format. Our server is fast and reliable so everything has been running smoothly so far, but we'd like to give users the option of saving the data to their device so they don't have to stream every time. I've only worked with SharedObjects before, which are capped at 100kb and won't be useful in this situation.
What would be the best approach for storing the images, and keeping them from being overwritten during updates? Saving an uncompressed Bitmap will use too much storage space. Adobe's JPEGEncoder class is completely useless as it takes 10-30 seconds to save a moderately-sized image on a typical device. It also doesn't make sense to re-encode the JPGs, and we need to preserve the transparency in the PNGs.
Right now we're using a Loader to retrieve the images and using loader.content to access the image data in code. Is it possible to save the image file in its original format locally when it is downloaded with a Loader? We would want the images stored in the application data and not accessible through the gallery. As for saving the data for each product (e.g. price, description, etc), would the built-in SQLite support be sufficient or should we create our own files?
Thanks for any tips!

We typically use a native extension to do this, but it is certainly possible in ActionScript.
When the file has been downloaded, we save it to the applicationStorageDirectory.
Next time, we check to see if exists locally, if so - use that and don't download.
   var file:String = renameFile(_externalHttpImage);
   //see if we already have a copy of the image
   var loader:Loader = new Loader();
   var ba:ByteArray = new ByteArray();
   if( fileExists(file)){
    file = File.applicationStorageDirectory.resolvePath(file).nativePath;
    loader.contentLoaderInfo.addEventListener(Event.COMPLETE, local_loader_complete);
    loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, errorOnChargeFile);
    var f:File = File.applicationStorageDirectory.resolvePath(file);
    if( f.exists){
     var fs:FileStream;
     try {
      //now load the size of the file
      fs = new FileStream();
      fs.open(f, FileMode.READ);
      fs.readBytes(ba);
      // trace("READ " + fs.readUTF());
      fs.close();
     catch(e:Error){
      trace( "Error Loading Image File '" +file + ": " + e.message+ "\n"+ e.getStackTrace());
    loader.loadBytes(ba);

How to animate images coming from web service in iphone sdk.

this is my code check once and give me reply.
- (void)parserDidEndDocument:(NSXMLParser *)parser{
    moreListTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 10, 320, 350) style:UITableViewStylePlain];
    moreListTableView.delegate = self;
    moreListTableView.dataSource = self;
    [self.view addSubview:moreListTableView];
    for(i=0; i < [advImagesList count]; i++){
        NSString *data=[[NSString alloc]initWithFormat:[advImagesList objectAtIndex:i]];
        Byte inputData[[data lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];
        [[data dataUsingEncoding:NSUTF8StringEncoding] getBytes:inputData];
        size_t inputDataSize=(size_t)[data length];
        size_t outputDataSize=EstimateBas64DecodedDataSize(inputDataSize);
        Byte outputData[outputDataSize];
        Base64DecodeData(inputData, inputDataSize, outputData, &outputDataSize);
        NSData *theData=[[NSData alloc]initWithBytes:outputData length:outputDataSize];
        imgview=[[UIImageView alloc]initWithImage:[UIImage imageNamed:data]];
        imgview.frame=CGRectMake(0, 317, 320, 50);
        imgview.image=[UIImage imageWithData:theData];
        [self.view addSubview:imgview];
    Timer = [NSTimer scheduledTimerWithTimeInterval:.1 target:self selector:@selector(moveRect) userInfo:nil repeats:YES];
-(void)moveRect
// imgview.animationImages=advImagesList;
    [imgview startAnimating];
    [imgview setAnimationDuration:2];

This is a user forum. Try developer.apple.com.

May I receive resolution 640*480 in image LV from WEB-camera

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