WorldViz User Forum  

Go Back   WorldViz User Forum > Vizard

Reply
 
Thread Tools Rate Thread Display Modes
  #1  
Old 01-24-2011, 04:32 PM
Trevor Trevor is offline
Member
 
Join Date: Jan 2011
Posts: 3
Ghosting with Nvidia 3d vision

Hello, we are having a problem with severe ghosting using Nvidia's 3D vision kit. We are using a Quadro FX 570 and a Samsung SyncMaster 2233. The driver is configured correctly and we get stereo 3D in vizard using viz.go(viz.QUAD_BUFFER|viz.FULLSCREEN). The problem is that the individual stereo images are partially visible though the glasses, thus creating two ghost images of the object next to the converged image.
We have tried to change the background color, texture, stereo vs non-stereo, etc, but to no avail. Darker backgrounds appear to minimize the ghosting somewhat but not significantly.
Is there a way to adjust the depth of the image in Vizard? It seems that decreasing the distance between the L and R stereo images would minimize the ghosting. Any input would be greatly appreciated, thanks.
Reply With Quote
  #2  
Old 01-24-2011, 06:29 PM
farshizzo farshizzo is offline
WorldViz Team Member
 
Join Date: Mar 2003
Posts: 2,849
Have you specified the screen distance in your script?
Code:
# Distance between user and screen (in meters)
viz.MainWindow.screenDistance(2.0)
Also, are the units of your model in meters?

You can also tweak the stereo effect using the viz.MainWindow.fusionDistance command.
Reply With Quote
  #3  
Old 01-25-2011, 01:06 PM
Trevor Trevor is offline
Member
 
Join Date: Jan 2011
Posts: 3
Thanks for the response. You answered my question. It is unfortunate that a balance must be struck between minimizing the ghosting effect and maximizing the stereo depth cues.
Reply With Quote
  #4  
Old 01-25-2011, 01:29 PM
mspusch mspusch is offline
WorldViz Team Member
 
Join Date: Feb 2003
Posts: 211
Hi Trevor,

did you get any other 3D applications going with less ghosting/crosstalk?

It sounds like you shutter glasses hardware might not be synchronizing correctly with the screen output frequency, or you have bad shutterglasses or something.

there are the following options

A) most likely the shutter glasses 'shutter frequency' is not corresponding correctly with the monitor/projector output frequency. adjustment to the screen / shutter glasses (frequency, sync settings?) might fix the problems

B) the screen / monitor / screen material has some 'after-effect', i.e. the details from one image 'linger' into the next image, which then would be seen as 'cross talk' between the two eyes

If stereo is setup/working correctly, there should be no crosstalk with shutterglasses, i.e. for example for a 120Hz output frequency, first second image should be seen by one eye and the second one by the other eye, etc. (frame sequential).

we have found that depending on the hardware (monitor/ TV screen / projector) it's sometimes not easy to find this correct configuration, and you might have to call the maker of your screen (samsung) or the glasses.

if you reduce the stereo effect in Vizard (make the eye distance smaller), all that does is to make the two images for each eyes more similar, so there is less 3D (and this might look as if there was less artifacts).

anyways, hope that helps.

Matthias
Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
stereo vision with nvidia 3d vision mina5500 Vizard 2 10-23-2010 09:53 AM
Nvidia 3D Vision and Vizard on non-quadro card? Jerry Vizard 3 10-14-2010 07:20 AM
question about NVIDIA 3D vision Weihua An Vizard 5 08-02-2010 07:49 AM
NVIDIA 3D vision question atamasan Vizard 3 03-29-2010 09:31 PM
Nvidia 3D vision Bundle jalvarez Vizard 2 07-12-2009 12:55 PM


All times are GMT -7. The time now is 02:22 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright 2002-2018 WorldViz LLC