From: support@ni.com
Date: Mon Feb 3, 2003  10:57:50 AM America/Chicago
To: hubbard@mcs.anl.gov
Subject: Re: (Reference#6824-VCZ432) ieee1394 palette wrong in snap with iBot
Reply-To: support@ni.com


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The Orange Micro iBot camera will not work with a Snap.  The reason for
this is that the iBot doesn't follow the industry standard DCAM spec
exactly, and as a result, the first frame you receive from it will always
be garbage.  You probably don't notice it with a grab, but the first frame
there will also be washed out.  This is because the iBot acquires images
continuously while it is powered on.  When it recieves a command to
transfer a frame, it doesn't wait for the next valid frame, it just sends
whatever data is currently has.  Every frame after that should be correct.

The method you have coded seems to be the same one that the iBot software
uses.  They start the acquisition and then take a later frame that they
know is valid.  Unfortunlately, the Snap will never work in MAX for this
camera, but the strategy you take in your code is a good solution.
Knowledgebase #1V9EHSU9 mentions this behavior briefly.


Best Regards

Kyle Voosen
Applications Engineer
National Instruments
http://www.ni.com/support

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Problem Description :


I have an Orange Micro iBot camera, which works well in the MAX util in
grab mode. In Max's snap feature, the image is totally washed out.

In the code attached, I can get good images only if I delay between config
and grab at least one second. If I use snap, or less delay, it gets washed
out as in MAX.

Confused? I know that I am.

I found the KB article #2DGHH1SN and will check the newer driver
this seems like a different problem.
NI Software :
Vision Software (IMAQ, OCR, etc.)  version 6.1
NI Hardware :
Other device
Driver Version :
OS :
Linux/Intel x86
CPU :
Pentium
RAM :
1024
Vendor :
Dell
Customer Information :
Paul Hubbard
Argonne Nat'l Lab
US
hubbard@mcs.anl.gov
Ph: (
630
)
252-4154