NUI Group - Open Source Interface

C++ MT app development?

2010-03-20T22:33:28Z

Hi,
I want to build a virtual solar system by using c++ and opengl. And I’d like to use CCV to detect the gesture, not Touchlib. However the only way I know to build a c++ MT app is following the example in Touchlib. And those examples could not interact with CCV. So is it possible for me to build a C++ MT app development framework by using Openframeworks, which will receive the UDP message and define Touch Event? I’m new to it. I‘ll appreciate any advice or reference. Thank you.

New CCV 1.3 Installer Released

2010-02-14T00:09:31Z

Hey guys we are happy to release CCV 1.3 which brings with it a much easier to use installer. We have worked on the tracking algorithm to provide much more smoother tracking, this includes a simple weighted low-pass filter and using floats instead of integers in our display mapping methods.

Please let us know any feedback and have fun! Getting started with computer vision and multi-touch has never been so easy.

Here are some of the changes:
- Move to LGPL License
- Fixed bug with acceleration value calculation
- Added raw binary TCP protocol (sync-header for blob data packet)
- Changed the color of buttons to red for better contrast
- Added 1-exp(accel/x) adaptive filter coefficient (for tracking smoothing)
- Fixed the blob count for blobs that are not sent ie. blob(0,0)
- More optimization for PS3 Eye
- Stopped using integers to for calibration mapping (CameraToScreenMap)
- Fixed known logging issue.
- See repository for full changelog

Blog Article | Project Page | Download Page | Get the Source

Trouble stitching cameras (got pictures)

2010-03-19T01:06:21Z

Hi all.

Working on an interactive laser lightshow using a touch table

Project is here: http://socialaser.cias.rit.edu/

We are having trouble stitching two PS3 eye camera feeds together. Software is CCV 1.3, codelaboratories driver, win7 x64. The problem is that we need to swap the x/y pixel dimensions, however the current rotation control is only rotating the image content, and not changing the feeds dimensions (as it should, I would think). Searching here did not turn up a solution… but I could be blind (quite possible :p )

Are there any controls that will do what we are looking for? Any other stitching software that would do the trick? I’m basically looking to put the cameras in ‘portrait mode’.

Thanks for your time, I know this is probably a stupid question.

--
Sincerely,
Kevin Whitfield
http://www.virtualmatter.org
socialaser.cias.rit.edu

CCV1.3 and CL-Eye Quad Pack

2010-03-04T18:00:49Z

If I get Quad Pack, can I just add Camera 3 and Camera 4 in CCV’s camera.xml and go ahead?

CCV Top down, Top of Head Tracking?

2010-03-17T13:25:30Z

Hi we’re doing an installation where we want to track the tops of peoples heads.
Basic thinking is to fly camera above floor, flood with IR, point camera straight down.
Then use CCV to turn the peoples head’s into blobs.

Wondering if anyone has tried this or has any ideas or suggestions of what we might encounter?
Any help appreciated, Thanks…

(CCV) Offset for Cameras

2009-12-15T08:13:35Z

Hello all,

it seems that by default the PointGrey FireflyMV (FireWire) camera uses format7 and x=0 in CCV . “x=0” means that the camera image has an offset by 60 pixels when using 640x480, since format 7 mode0 is 752x480 on the FireflyMV.
I have found the file “data/cameras.xml” in CCV 1.3 where it is possible to set an offset for the camera. But it does not seem to be used by the application at all.
Is there any other possibility to set an offset for the camera?

Any help appreciated.
Greetings

MultiTouch Vista / WM_TOUCH

2010-03-16T19:23:01Z

Hi~
My first post.
I have two kinds of questions.

1. MultiTouch Vista
I have a custom Touch Screen.
I want to use it.
I want to know how to send input message of custom Touch Screen. (Using MultiTouch Vista)
Modify the code should be.
But I don’t know what code should I modify.
Can I get sample code?
If I can’t get sample code, I need advice.

-----------------------------------------------------------------------------------------------------------------

2. WM_TOUCH
PostMessage(HWND_BROADCAST, WM_TOUCH, wParam, lParam)
Is it possible that the above statement
I have tried so many times.
But The WM_TOUCH message is not delivered.
If it’s not that…
Are there any other solution?
I want to send WM_TOUCH message to Windows.
Please advise.

If you know something that a solution about two kinds of questions.
Please reply.
Thank You !!!

Remapping to correct radial distortion—best technique? CCV developers?

2010-03-11T17:18:14Z

I was trying to grab the source for CCV, but nuicode seems to be down. I’ve made an openFrameworks add-on called “Magnetic” that uses OpenCV to do tracking of blobs, outlines, peaks, and skeletons. You basically extend ofxMagneticApp instead of ofBaseApp and just call “getBlobs()” whenever you want info (has some nice features like integrated fullscreen settings and calibration). As much as we love CCV here, we’re finding we need something lightweight integrated directly into the applications we build.

But I’m not writing about Magnetic, I’m writing to ask what is the best approach to remap the camera image to the image you analyze for blobs? CCV seems to work well with both linear and lens distorted images (so long as there are more points), whereas mine sucks with a wide angle lens. Does CCV use any undistorting techniques, or are y’all just using cvFindHomography? I’m doing the latter, and just wanted to figure out which route to pursue.

My options are either:

A) Continue to use cvFindHomography() and allows users to add more points (a la CCV).
B) Stick with just four corners and then use arrow keys to adjust radial distortion values.

I’m thinking A would be the right route, as B could fail if the image is lopsided. It’s important that works for any type of screen. In fact, half of Magnetic’s whole purpose is to track limbs, etc, not touch points, so dedicated radial distortion correction is not an option.

Ideas?

A few early Magnetic videos, if interested:

[youtube]AEysenAU3qU[/youtube]

More:
http://www.youtube.com/watch?v=W8kR7jbbtpY
http://www.youtube.com/watch?v=9NUa3k6cWY4

CCV 1.3 Source code? where is the latest? i only see source from October

2010-02-27T12:14:26Z

Latest 1.3, i am guessing 1.3B or what most now consider just 1.3 final, i do not see the source code for this.

I am looking at http://nuicode.com/projects/tbeta/files and i am seeing the source from what looks like 1.3A since date reads 10/19/2009 05:14 am

Every other file for 1.3 Final reads 2/10/2010, so wondering where can someone get the latest source?

Update: I think i may have answered my own question, under http://nuicode.com/projects/tbeta/repository seems to be all the source code revisions.

Therefore here i can get the source code, but my remaining question is which version reflects 1.3 Final? if i had to guess i would say 204

but then Stefan has a few revisions since then and now latest is 207 and i am wondering whats
A) the last stable revision which was 1.3 Final
B) what are the changes that Stefan has made? is it worth going to 207?

Following are notes on 207..
Check in of the CCV Fiducial TUIO 1.1 version and the Multiplexer . codebase from 02/12/2010.
Please give feed back if something is missing.
by Stefan Schlupek

ccv 1.3 still not working

2010-03-09T17:12:06Z

Ok, I guess it is time to back up another ten yards and punt here. I am still unsuccessful at getting ccv 1.2 or 1.3 to run on my desktop even though it runs just fine on my laptop. For a bit I had thought that it had to be hardware related but I’m not so sure now. I think that there is possibly some software on my laptop that is not on my desktop that is allowing the laptop to work and not the desktop. So far what I have been told is to make sure I have quicktime and flash installed- which I do. Anything else? I have tried every suggestion from earlier threads I have posted with no prevail. I have tried to look for a beginners guide to ccv but nothing really pertaining to additional software needed to run ccv. ccv beta works by the way but why not 1.2 or 1.3? The ps3eye test works, but when I try to open ccv it crashes just before it opens all the way and wants to send an error to microsoft. Do I need the latest Java, Directx, Flash Player, etc? What could I be missing? I thought maybe doing a format and clean xp install would resolve the issue but now I think that I still dont have some piece of software needed for ccv. Any help please is much appreciated and thanks to those with ideas in my threads I posted earlier. I wish those ideas would have been a solution to my problem.