Making measurements within acquired video?

Hi everyone! I have an interesting problem and was hoping someone could help guide me down the correct path. Currently, we are using Labview to capture video (.avi) in one of our experiments. Provided the video, we would like to be able to make measurements at different points in time. Specficially, we would like to measure the diameter of a circle at different points in time as it grows in size. The diameters will likely be in the range of 1-5 mm. Is there any kind of post processing method that could help us? I am pretty new to labview so I am not too familiar with the possibilities, any help would be greatly appreciated!
-David

Check out IMAQ. It is a very complete set of machine vision tools to handle just about anything. If you don't have a budget for IMAQ (or a site license if you are at a school or university), you will need to do it yourself. The steps are roughly as follows:
Get a single frame of the video. This may be more or less difficult, depending upon the video format and the APIs available to you from your camera manufacturer.
In this single frame, apply image processing techniques (e.g. check out this Stack Exchange answer for finding a circle)
Go to the next frame and repeat.
If you don't have IMAQ, be prepared to write some code. The algorithms for finding circles in images are fairly well documented in many places, and you can implement them in LabVIEW, but you may need to go to a lower level than you are used to. If this happens, just go for it. Or convince your supervisor/professor to get IMAQ .
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Need advice on making a simple Flash video file. Trying to accomplish two things.

I have some video files (.avi) that I am trying to convert to a Flash video format. I am trying to export it to a Flash player to go into a Powerpoint file. With this, I am trying to accomplish two goals:
1. To have the short clip (15sec, 30fps) endlessly loop, like an animated .gif.
2. To allow the user to click on the video player and drag left/right to ff/rew.
The video itself is a turntable animation. One of our products is making a complete 360degree turn. By allowing the user to grab and drag, it will simulate them rotating the model.
So far, I have already accomplished Goal 1. I made a new Actionscript 3 file, imported video (embed flv in swf and play in timeline), and then made the video loop on the timeline. This seems to export properly, and the video loops as needed. The only thing I can't figure out is how to make the video "interactive" and let the user drag left/right.
For context, I have never used Flash before. Any help would be greatly appreciated.

This will come down to essentially moving the playhead of Flash based on the movement of the mouse. It's certainly not going to be smooth however, you'd need a timer to be responsible for moving your playhead and reversing spatial compression is very CPU intensive (moving backwards on the timeline). I'd recommend having a forward and backward version of the video so you could flip between them but if you're new to flash you're already in way above your head.
Add a new layer and try adding this example script (or Download Source example here, saved to CS5):
import flash.utils.Timer;
import flash.events.TimerEvent;
import flash.events.MouseEvent;
// make sure we don't trip this frame twice
if (!stage.hasEventListener(MouseEvent.MOUSE_DOWN))
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          stop();
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          var curFrame:int = 1;
          var mouseStartX:int; // used later to determine drag
          // detect mouse click and drag left or right
          stage.addEventListener(MouseEvent.MOUSE_DOWN, onMouseF);
          stage.addEventListener(MouseEvent.MOUSE_UP, onMouseF);
          // create new timer to control playhead, start it
          var phTimer:Timer = new Timer(33,0);
          phTimer.addEventListener(TimerEvent.TIMER, movePlayheadF);
          phTimer.start();
          // function to control playhead
          function movePlayheadF(e:TimerEvent):void
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                    if (curFrame > this.totalFrames) curFrame = 2;
                    else if (curFrame < 1) curFrame = this.totalFrames;
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                    this.gotoAndStop(curFrame);
          // function that controls the direction variable
          function onMouseF(e:MouseEvent):void
                    if (e.type == MouseEvent.MOUSE_DOWN)
                              // user started touching, record start spot
                              mouseStartX = int(stage.mouseX);
                    else if (e.type == MouseEvent.MOUSE_UP)
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                              if (stage.mouseX > mouseStartX)
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                                        movingForward = true;
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This is pretty simple. In the example source link above an object on the timeline (nice ugly red circle) moves right over 60 frames and then left over 60 frames (120 total). Consider that your movie.
A timer ticks at a speed of 33ms (30fps). This is where it isn't necessarily going to be too smooth with video. If you increase it to 60FPS then decrease the timer by half (16.5ms), season to taste. Each time the timer goes off the playhead is moved, either forwards or backwards.
To know if it should go forward or backwards a simple variable (movingForward) keeps track of the last 'swipe'. The swipe is simply captured when a user touches the screen (mouse/finger), moves in a direction and then lets up. If they moved to the left the direction will be reverse. If they moved to the right it will move forward. This doesn't take into consideration any more than that logic, but illustrates how you can watch the mouse for movement and "do something" based on it.
A very simple validatior in the timer event function checks to see if the next frame (in either direction) is valid and if it's not, it corrects it so it stays within your videos timeline length.
Note there is a MOUSE_MOVE event you can try to hook to which can be used to literally let the user drag the video forwards and backwards the amount they drag their finger/cursor. Also if this is some kind of circular surface like a record spinning, the direction the user moves the mouse based on where they touch the record would change which direction they expect it to move. Etc etc..
That should get your feet wet in how much you need to consider for your project.

CS6-DW ? about active hyperlinks within my video

Hi All,
I was wondering if you any of you have conquered this problem?
"Flash supports hyperlinks inside video. Yet, IOS does not support Flash" (mobile devices) For the most part, old Droids do.
In Apple's infinite wisdom, SJ decided not to support flash. So going the way of the Dodo Bird, I am trying to keep current while using what I think is a slick option.Embedding links inside video.
Youtube allows it with their files (For this reason I believe it can be done in an mp4) Yet Youtube only allows for links within their site,
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Hi Nancy,
I think you are not getting my point, or question. You are referring to embedding the video, whereas I am referring to embedding a link inside a video. You know a hyperlink within a video?
What I had thought Youtube may have been a solution, was not. Youtube'e Annotation tool merely rewraps a video in a SWF or FLV wrapper to then add a hyperlink to your video. (Same as Flash)
Challenge: Iphone (as mentioned above) does not support it.
Work around, TIme machine. 1988 circa Animated Gifs and written code to trigger the pictures to however many FPS desired
Here is a better explanation of how to achieve joy- for those who would like a richer user experience of their website with cross platform capabilities...
http://www.icodeblog.com/2009/07/24/iphone-programming-tutorial-animating-a-game-sprite/
My work around of making the whole thing an < A href image link to my HTML page.
Reminds me of the Beta, laser disc, Vhs wars...Iphone's and Mac's ughhh! Like DSLR's in my camera world!
Don't take it personal if you have a Mac, I understand. I had a Benz before too, then got a Lexus. LOL!

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I created something like it with Captivate in the past so I was going to again. I guess the scope has changed enough that Captivate is not the right tool. But I thought it was worth asking in case a Captivate user has had a similar need and might have some advice in how I can accomplish this. I don't know much about video editing, but in my research, I haven't yet found a way.

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Message Edited by dany_s on 06-25-2009 03:58 PM
Solved!
Go to Solution.

Hello,
I think you can try two things : the soft reboot, and if it does not work, the hard reboot. Don't worry, you can't lose data with these two reboots.
Soft reboot :
1) Hit the three following keys at the same time :
- Alt
- Right Shift
- Delete
2) wait 2 minutes for the Blackberry to wake up.
Hard reboot :
1) your Blackberry device is on
2) remove the battery and wait for a minute
3) Put the battery back
4) wait 5 minutes for the device to wake up.
Please tell us if it works for you.
The search box on top-right of this page is your true friend, and the public Knowledge Base too:

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Hello Guys,
I am a new commer in this fourm and this is my first post.
I am working on a project where i need to acquire analog video into labview 8.5 for this purpose i have a analog security camera and PCI TV tunner card (Manufactured by ASUS) and i built the routine in Matlab 2007 and its working(But not satisfying me).
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Hi - did you do anything special to get the Labview Mathscript node to use the Matlab Image Acquisition Toolbox? It won't let me type the following: vid = videoinput('winvideo'); whereas this works just fine in Matlab proper. Do I have to configure the winvideo adapter in Labview or is it hating my code at an even higher level than this? (Block Diagram Errors: "Unknown symbol on line 2 column 7: videoinput" ...)
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Message Edited by rolfk on 04-21-2010 07:11 AM
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a division of Test & Measurement Solutions

How to handle 3 different fact tables and measures within a DAX query?

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My dad and I had an idea for a project. I'll give a quick
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Check out articles here: http://www.adobe.com/devnet/flashmediaserver/
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Making measurements within acquired video?

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