Transmitting Images

Hey
Can anyone give me a run down of how to load an image from file and then send if through a server to be displayed on a number of clients. I can load the picture okay but i am having trouble getting it sent.
Can someone please give me a step through guide and also fuction and code examples
Thanks

hmm.. this is kind of complicated, but i'll give you the skeleton.
first, read the image file. Not as an image, but as arbitrary binary data (i.e. the result should be either a stream of bytes or an array of bytes.)
Next, upload the data to the server. The server needs something to accept the data (a servlet or a custom server program).
THen either the server sends the data to a list of clients or those clients request it from the server. The clients read the data, make an image of it (look up ImageIO or Toolkit classes), and display it.
please see the essential classes, custom networking, and creating guis with jfc/swing tutorials for details & codwe examples. http://java.sun.com/docs/books/tutorial/index.html
which step do you have problems implementing?

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Capture video through TCP/IP protocol in labview

Hi Friends, How to acquire video data using TCP/IP read? actually i am trying to control a robot using labview. This robot has WiFi card and has an ip 169.254.0.10. Robot control protocols are already burnt into blackfin processor, of the robot, example.... if i enter 8 in string control of front panel, robot will move forward, 2 is backward, 6 is right and 4 is left. Robot has camera and transmits images through tcp/ip protocols. well.... i am able to establish wifi connection between my PC nd robot and i am able to control it simply by entering corresponding numbers in string control of VI but i am not able to acquire video from the camera through TCP/IP read platelet. ( someone has created a java consol for this robot and i downloaded it from online forum. by running this consol i can control the robot and also accquire real time video) but i want to do the same using labview. please help.
labview version: 8.6
NI vision 8.6
vision acquisition 2009
robot reference
robot control protocols: http://www.surveyor.com/SRV_protocol.html
http://www.surveyor.com/SRV_info.html
journal: http://www.surveyor.com/cgi-bin/robot_journal.cgi
Forum: http://www.surveyor.com/cgi-bin/yabb2/YaBB.pl
Attachments:
roboimage.vi ‏39 KB

You do realize that you are not actually reading any data, don't you? Your input to the TCP Read VI is the default which is a value of 0. So in essence you are saying read nothing. Also from reading through some of the information you pasted it appears that the video is streamed via a web browser. There simply reading from a TCP port will not accomplish what you want. Do you have the Interent Toolkit? That has an HTTP protocol implementation which may work for you though I don't think it will have what you want. It looks like you need to send an HTTP GET to retrieve the video image. You could also try using ActiveX or .Net to embed a browser window in your application.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

Cloned datasource, but unable to use the both at the same time

I used the AVTransmit java application as sampe to build my applet for transmitting realtime image from the webcam. I desired that it has a container to contain the player and it has a button for RTP transmission.
I have used the Manager.createCloneableDataSource(ds) to clone the datasource from webcam.
The applet can display realtime image on the container. While I clicked the button, the container hanged up and then changed to black. But the data can transmit by RTP part. I can receive the transmitted image in another PC.
Do you have any idea ?
     public void init() {
          Component vc = null;
          Component cp = null;
          JPanel visualContainer = new JPanel();
          visualContainer.setLayout(new BorderLayout());
          JPanel mainPanel = new JPanel();
          mainPanel.setLayout(new GridLayout(2,1));
          JPanel inputPanel = new JPanel();
          inputPanel.setLayout(new GridLayout(2,1));
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          for (int i = 0; i < vlist.size(); i++) {
               CaptureDeviceInfo vinfo = (CaptureDeviceInfo)vlist.elementAt(i);
               locator = vinfo.getLocator();
          try {
               ds = Manager.createDataSource(locator);
          } catch (Exception e) {
               System.err.println("Unable to create DataSource from : " + locator);
               System.exit(0);
          ds = Manager.createCloneableDataSource(ds);
          if (ds == null) {
               System.err.println("Unable to clone the DataSource");
               System.exit(0);
          try {
               player = Manager.createRealizedPlayer(ds);
          } catch (Exception e) {
               System.err.println("Unable to create a player from the DataSource :" + e);
          player.addControllerListener(new PlayerStateListener());
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          player.prefetch();
          if (!waitForPlayerState(player.Prefetched)) {
               System.err.println("Failed to realize the player");
               //return false;
          if ((vc = player.getVisualComponent()) != null)
               visualContainer.add(vc, BorderLayout.CENTER);
          if ((cp = player.getVisualComponent()) != null)
               visualContainer.add(cp, BorderLayout.SOUTH);
          player.start();
          mainPanel.add(visualContainer);
          System.out.println(player);
          setVisible(true);
          getContentPane().setLayout(new BorderLayout());
          ipAddressField = new JTextField();
          pbField = new JTextField();
          sendButton = new JButton("Submit");
          sendButton.addActionListener(this);
          inputPanel.add(ipAddressField);
          inputPanel.add(pbField);
          inputPanel.add(sendButton);
          mainPanel.add(inputPanel);
          getContentPane().add(mainPanel);
          System.out.println("locator = " + locator);
// this is the code segment for RTP transmit
          try {
               processor = javax.media.Manager.createProcessor(ds);
          } catch (NoProcessorException npe) {
               return "Couldn't create processor";
          } catch (IOException ioe) {
               return "IOException creating processor";
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          boolean result = waitForProcessorState(processor, Processor.Configured);
          if (result == false)
               return "Couldn't configure processor";
          // Get the tracks from the processor
          TrackControl [] tracks = processor.getTrackControls();
          // Do we have atleast one track?
          if (tracks == null || tracks.length < 1)
               return "Couldn't find tracks in processor";
          // Set the output content descriptor to RAW_RTP
          // This will limit the supported formats reported from
          // Track.getSupportedFormats to only valid RTP formats.
          ContentDescriptor cd = new ContentDescriptor(ContentDescriptor.RAW_RTP);
          processor.setContentDescriptor(cd);
          Format supported[];
          Format chosen;
          boolean atLeastOneTrack = false;
          // Program the tracks.
          for (int i = 0; i < tracks.length; i++) {
               Format format = tracks.getFormat();
               if (tracks[i].isEnabled()) {
                    supported = tracks[i].getSupportedFormats();
               // We've set the output content to the RAW_RTP.
               // So all the supported formats should work with RTP.
               // We'll just pick the first one.
               if (supported.length > 0) {
                    if (supported[0] instanceof VideoFormat) {
                         // For video formats, we should double check the
                         // sizes since not all formats work in all sizes.
                         chosen = checkForVideoSizes(tracks[i].getFormat(), supported[0]);
                    } else
                         chosen = supported[0];
                         tracks[i].setFormat(chosen);
                         System.err.println("Track " + i + " is set to transmit as:");
                         System.err.println(" " + chosen);
                         atLeastOneTrack = true;
                    } else
                         tracks[i].setEnabled(false);
                    } else
                         tracks[i].setEnabled(false);
          if (!atLeastOneTrack)
               return "Couldn't set any of the tracks to a valid RTP format";
          // Realize the processor. This will internally create a flow
          // graph and attempt to create an output datasource for JPEG/RTP
          // audio frames.
          result = waitForProcessorState(processor, Controller.Realized);
          if (result == false)
               return "Couldn't realize processor";
          // Set the JPEG quality to .5.
          setJPEGQuality(processor, 0.5f);
          // Get the output data source of the processor
Many thank you in advance

Dear jcparques
Thank you for your reply.
I have tried to use the clone datasoure for player and original datasource for RTP transmission, the player displayed black and the RTP successfully, as I can get the live image by another PC. I have tried to use the clone datasoure for RTP and original datasource for player, the player worked normal and the another PC awared the participant joined. It has just waiting the data from RTP.
I sured the datasource has been cloned as I can System.out.println it, it is not a null.
Any idea. Thank you very much.

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When I play a VHS tape from a JVC HM-DH30000U player through the Canopus video converter in to iMovie on my Mac OX 10.5, I get a black line area about an inch at the bottom of the picture and the picture is wigglely. I have tried everything I know - under the menu in the VHS player, etc.
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What you are seeing is the sync pulse information needed by analog TV - this information is hidden when shown on CRT TV sets because the displayed image is slightly smaller than the transmitted image. Unfortunately, the hidden 'junk' normally hidden by the CRT TV overscan becomes visible when you see the whole image on a computer monitor.

Color noise/dithering with MacPro DVI output

Hello everybody,
to describe my problem/question I have to give you some additional information.
I am working for a company that produces KVM extenders. One of our products is an digital extender system which enables the transmission of standard computer signals (keyboard, video, mouse) via CAT cable over distances up to 140 meters.
In combination with a MacPro (MacPro 4,1, Mac OS X 10.6.5), this extender shows some "peculiarities" when transmitting images.
The mouse does not move properly at our receiver module; the cursor stutters at the screen.
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In order to make the color noise visible, we used a screen-capture tool to produce several images of a standard desktop of a Mac OS X installation.
We took a closer look at these images and realized that the green background does not consist of one RGB color value, but of slightly deviating color values. In order to highlight the different color values, we used a graphic tool and colored the color values with more differing colors.
Now the color noise is clearly visible. When we looked at the same image with a delay in time, we realized that the color noise was not static but seemed to appear rather randomly. The colors deviate and a stuttering image is displayed!
The crosscheck against a background without color (white) shows that the color noise does not occur and the image performance of our extenders has evidently improved.
Now my actual question:
Does anyone know how to disable this dithering within Mac OS X?
Thank you in advance for taking the time to read this and maybe give me some hinds to solve the problem.

Hey Shane
I hate to go back to an old topic, but i need help.
I took your advice and bought the Blackmagic Thunderbolt Intensity Shuttle. I have the thunderbolt cable coming out of my iMac and into the Blackmagic box. Out of there I have the RGB cable going to my monitor, however I have no signal. I tried looking into contacting Blackmagic, but no luck. I thought I would ask you, since you seemed to have some knowledge.

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Hello there James, aka @jml18 !
I read about the scan quality issue you're having with your Officejet 8500, and would like to share my suggestion with you.
Use this guide for your troubleshooting steps. If the problem continues afterwards, call HP directly to see about replacement or trade in options.
Scans are Fuzzy or Unclear
HP's contact info:
If you are calling within North America, the number is 1-800-474-6836 and for all other regions: click here.
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R a i n b o w 7000I work on behalf of HP
Click the “Kudos Thumbs Up" at the bottom of this post to say
“Thanks” for helping!
Click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution!

I have a macbook pro, a mini display port to hdmi cable to hook up to my tv (a toshiba 1080p flatscreen). what do I do to actually get the image on the tv screen? Do I need another cable for sound?

I am trying to watch a tv show that I purchased into I-tunes. I have the cable and it hooks to the TV okay. The TV shows the regular apple screen that looks like the universe screen - like when it boots up or is doing an upgrade on the OS. I can't get the image to go from the laptop to the TV. I tried under displays and it shows the TV as a display but I can't get the image on the TV.......Please help.

Rwogera wrote:
I couldn't transmit sound either, do i need another cable like Kim said? i mean it cant be transmitted through this HDMI port? as for me i have one of the latest mac pro with intel core i5..tnx
I need to know which MacBook Pro you have. Only mid-2010 and later MBP's transmit sound through MiniDisplay Port to HDMI. I have no information about the Mac Pro, so you might want to go to that Forum and ask there.

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I'm embedding a front panel image in an existing HTML dokument. I would like to use the command .monitor in the URL together with the refresh command so the VI automatic will reload every 20 secund. This actual work, but simultaneous I want to have the possibility to refresh manually so I don't have to wait 20 sec before new values is shown in the display. Is this possible to do?
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There are several ways to add animation on to web pages. The techniques used h
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link to the webpage so you can have a look at the display:
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Annis,
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If you really want to monitor in "Real-Time" using Remote Panels (requies LabVIEW 6.1) is your best option. This posting has more information on using Remote Panels and links to some live examples:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=506500000008000000C0660000&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0&USEARCHCONTEXT_TIER_0=0&USEARCHCONTEXT_TIER_S=0&USEARCHCONTEXT_QUESTION_0=web+control&USEARCHCONTEXT_QUESTION_S=0
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With .monitor the only way I've been able to manually refresh is to "Shift+Refresh" on the browser.
Regards,
Kamran

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Yes, I see the big ugly squares. They are what appears whenever extremely heavy JPEG compression is applied to a low-resolution image tht has relatively large areas of similar colors. Something somewhere is applying such compression to the pages, or portions of them, that you are viewing in your browser(s). Your MBP is not doing that: it can't. Either the page images (or parts of them) are being compressed by the website owners or, if every web page is affected, they are being compressed by your ISP in the process of being transmitted to you, as Gordito suggests. That would greatly increase the speed of page loading, but at the expense of image quality. You wouldn't see the image degradation on an iPhone or cell phone — the screen is too small — but on the MBP's high-resolution display it would be much more apparent, IF the MBP were receiving the signal in the same highly compressed form as the phone. If the MBP receives the same web pages through an ISP that doesn't over-compress them, they'll look the way they ought to look. So if you are receiving these web pages through a cellular ISP rather than through a broadband connection, take the MBP to a wifi hotspot and connect through wifi instead. I bet things will look different then.
Compressing images is something a web browser can't do: a browser just displays the signal that comes to it.

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Hi everyone,
Hoping someone can help me with a issue i have with my new macbook pro.
When browsing the net, safari and firefox show really pixelated images. I thought it might be my internet connection compressing data or something, but i have tried other computers on the same internet connection and the images show perfect...
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I will include some screen shots so you can see exactly what i mean.
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screenshots
http://i134.photobucket.com/albums/q93/Bonustokin/randon/Screenshot2010-02-13at1 00814PM.png
http://i134.photobucket.com/albums/q93/Bonustokin/randon/Screenshot2010-02-13at1 00814PM.png

Yes, I see the big ugly squares. They are what appears whenever extremely heavy JPEG compression is applied to a low-resolution image tht has relatively large areas of similar colors. Something somewhere is applying such compression to the pages, or portions of them, that you are viewing in your browser(s). Your MBP is not doing that: it can't. Either the page images (or parts of them) are being compressed by the website owners or, if every web page is affected, they are being compressed by your ISP in the process of being transmitted to you, as Gordito suggests. That would greatly increase the speed of page loading, but at the expense of image quality. You wouldn't see the image degradation on an iPhone or cell phone — the screen is too small — but on the MBP's high-resolution display it would be much more apparent, IF the MBP were receiving the signal in the same highly compressed form as the phone. If the MBP receives the same web pages through an ISP that doesn't over-compress them, they'll look the way they ought to look. So if you are receiving these web pages through a cellular ISP rather than through a broadband connection, take the MBP to a wifi hotspot and connect through wifi instead. I bet things will look different then.
Compressing images is something a web browser can't do: a browser just displays the signal that comes to it.

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Yes, I see the big ugly squares. They are what appears whenever extremely heavy JPEG compression is applied to a low-resolution image tht has relatively large areas of similar colors. Something somewhere is applying such compression to the pages, or portions of them, that you are viewing in your browser(s). Your MBP is not doing that: it can't. Either the page images (or parts of them) are being compressed by the website owners or, if every web page is affected, they are being compressed by your ISP in the process of being transmitted to you, as Gordito suggests. That would greatly increase the speed of page loading, but at the expense of image quality. You wouldn't see the image degradation on an iPhone or cell phone — the screen is too small — but on the MBP's high-resolution display it would be much more apparent, IF the MBP were receiving the signal in the same highly compressed form as the phone. If the MBP receives the same web pages through an ISP that doesn't over-compress them, they'll look the way they ought to look. So if you are receiving these web pages through a cellular ISP rather than through a broadband connection, take the MBP to a wifi hotspot and connect through wifi instead. I bet things will look different then.
Compressing images is something a web browser can't do: a browser just displays the signal that comes to it.

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Hi -- I've set my Mail program to NOT display remote images, and Junk Mail filtering is on, but if I click on a message marked as "Junk" it still loads up the image! Doesn't this kind of defeat the security involved in marking a message junk? Loading the remote image now tells the spammer that my email address is valid and I am clicking on their messages! How do I tell Mail to stop it? This makes me wary of even trying to check if a message is spam or not in fear of accidentally transmitting my existence to the spammer...

Hi geefunk3.
it still loads up the image!
What image? The setting is just to prevent Mail from loading remote images. There is no harm in Mail displaying images sent as attachments with the message. Only images that require connecting to a remote server to display them are an issue -- see How HTML Email Messages Relate to Unsolicited Commercial Email ("spam").

Stream-in images from client to server,without running the transmit code

Hello all,
Im using JMF for my current project.Right now,I am trying to only recieve images from the client without the client transmitting it.That is I dont want the transmit code to run on the client.
I should just be able to stream in the images from client to server, without running the transmit code on client.
Can this be done?
Thanks in advance

suppigs wrote:
Can I know more about this?Sure.
<Side A>
You'd just need to write an application that doesn't have a GUI (so, a console-based application) that listens on some pre-determined port for a message to start broadcasting. Maybe you'd send it the IP/PORT number to start broadcasting on. Once it receives that message, it'd start broadcasting the web cam to the IP/PORT number until it received a message to stop. Once it stops, it'll just go back to waiting for the next "start" signal.
<Side B>
On the other side, you'd write an application that sends the start messages, receives/displays the videos, and then sends the stop signal. This will have a GUI, and be your "control program" so to speak.
Then, once of have both of those programs working...if you're using Linux, you're done. If you're using Windows, you'd need to modify the <Side A> program so that it can run as a Windows service.
There are a lot of ways to do this, you can google it or look at the following link:
[http://twit88.com/blog/2007/09/19/open-source-software-to-start-up-java-as-windows-serviceunix-daemon/]

Transmitting Images

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