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VCS - Troubleshooting

Following Problems are known when using VCS:



Problem: Auto Compare / Histograms not visible


Everything is set up, the cam delivers a Foucault shadowgram, the couder screen is visible but Auto Compare only shows a picture like this.

Solution

This behaviour is often caused by hardware acceleration.
When the cam is running, the image is actually displayed on a different surface/layer called overlay that is set up by hardware acceleration. When you now use Auto Compare, VCS can only access the normal surface where the image isn't displayed. That's why it comes out black as the cam-picture is invisible to VCS.
Fix this behaviour by turning off hardware acceleration. You can either disable hardware acceleration locally in the application that is supplying the image (recommended in case the cam's driver software offers this functionality), or disable hardware acceleration system wide.
A way to check if hardware acceleration is activated is by running dxdiag.exe (delivered with Windows).
Go to tab 'Display' and check if 'DirectDraw-Acceleration' is activated or not.

How to Switch Off Hardware Acceleration System Wide
In case it is not possible to disable hardware acceleration locally in the cams's driver software, you can do this system wide. Depending on the operation system, the graphic card and the grafic driver there are following possibilities:

a) Using 'dxdiag'
Eventually you can (de)activate hardware acceleration in 'dxdiag' directly!


b) Using OS-Functionalities
(Sorry, I do not have an English OS, so the pathes below might be inexact!)

  • Win XP, Win 2000
Start > Control Panel > Display > Properties > Settings > Advanced > Troubleshooting and slide the Hardware Acceleration slider from Full to None.

  • Windows 7
Start > Control Panel > Personalization and Display Settings > Click Advanced Settings > Click Change Settings on the Troubleshooting tab > Move the Hardware Acceleration slider to None
Click Apply and then click OK to accept the new setting and close the dialog box
Click OK to close the Display Properties dialog box.

  • Windows Vista
Choose Start > Control Panel > In the Appearance and Personalization section click Adjust Screen Resolution > Click Advanced Settings > On the Troubleshooting tab click Change Settings > Move the Hardware Acceleration slider to None
Click Apply and then click OK to accept the new setting and close the dialog box.
Click OK to close the Display Properties dialog box.

c) By Means of Graphic Card Utilities
Eventually any tool installed with your grafic card's driver provides a possibility to deactive hardware acceleration.


d) Using DirectX Control Panel
Beginning with Windows Vista (and dependig on the graphic card and the grafic driver installed) it is no longer certain that hardware acceleration can be deactivared directly in the operating system (do not ask me why). In this case you can use the tool DirectX Control Panel, which is part of Microsoft's DirectX Software Development Kit (> 500 MB), but for home-users, it is also available as a small stand alone application (digitally signed by Microsoft)
Under http://www.3dcenter.org/download/directx-control-panel you will find a free download (only 125 KB).
Additionally you need a packing program that can handle 7z-Format, e.g: 7-Zip.
After unpacking file directx_cpl-month_year.7z run
dxcpl_x86.exe for 32-bit or dxcpl_x64.exe for 64-bit systems.
Then, in tab 'DirectDraw', uncheck 'Use Hardware Acceleration' in order to deactivate hardware acceleration.

Note:
After having changed hardware acceleration 
  • relaunch the cam's software or (to be sure) restart windows!
  • The author has tested the (de)activation of hardware acceleration on several systems using both the windows-intrinsic functionalities as well as DirectX Control Panel without any problems. Despite that, the author assumes no liability for damages, direct or consequential, which may result from the use of the proposed functionalities and programs. The user must assume the entire risk of changing any system settings.




Problem: Computer Screen Freezes

Several windows or complete computer screen freezes.
Sorry, this is a Windows bug. Applications that run perfectly in all current operation systems fail as soon as the Desktop is switched to 'Aero Design'. Especially 'Aero Glass' often causes severe problems in many programs.

Solution

=> Deactivate 'Aero Design'
Vista and Win 7 offer various approaches to deactivate this (needless to say that the approaches differ in both operation systems!)
Here is a method that works well:

Level 1:
Start > Control Panel > Administrative Tools > Services > Desktop Window Manager Session Manager
Click the 'Stop' button and additionally set 'Startup type' to 'manual' (this avoids an automatic restart of this service with next start of Windows)

German OS: Start > Systemsteuerung > Verwaltung > Dienste > Sitzungs-Manager für Desktopfenster-Manager
French OS: Panneau de configuration > Outils d'administration > Services > continuer > Gestionnaire de sessions du Gestionnaire de fenêtrage  > General: click arrête in statut du service&quot > OK
These steps set the design to'Windows 7 Basic' and 'Windows Vista-Basic' respectively
Normally this is sufficient to run VCS without problems.

Level 2 (if Level 1 does not help):
Start > Control Panel > Administrative Tools > Services > Designs
(German: Start > Systemsteuerung > Verwaltung > Dienste > Designs)
Click the 'Stop' button and additionally set 'Startup type' to 'manual' (avoids an automatic restart of this service with next start of Windows)
This sets the design to'Windows 7 Classic' and 'Windows Classic' respectively.
 
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