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RE: SUGGESTION FOR A Linux based Card




I could not all agree with your opinion, Roger. if you do a side-by-side image/video quality comparison, especially using a resolution chart as object in front of your video camera, you will see the big difference. Pay attention to aliasing artifacts.

Best regards,

Charlie X. Liu, Ph.D.

Dept. of Engineering
Sensoray Company
7313 SW Tech Center Dr.
Tigard, OR 97223, USA
Phone:  (503) 684-8073
Fax:    (503) 684-8164
Web:    http://www.sensoray.com


-----Original Message-----
From: Roger Oberholtzer [mailto:roger@xxxxxx] 
Sent: Friday, July 09, 2010 2:55 PM
To: Charlie X. Liu
Cc: video4linux-list@xxxxxxxxxx
Subject: RE: SUGGESTION FOR A Linux based Card

On Fri, 2010-07-09 at 09:30 -0700, Charlie X. Liu wrote: 
> Is it a BT878-based or SAA7134-based? If you are looking for a better quality capture card, considering a SAA7134-based is very important, since BT878 is too old and SAA713x is a newer generation one that uses more advanced technologies including using the adaptive comb filter and adaptive anti-alias filtering techniques which make big difference on image/video quality.

They have a few different cards. BT878 is not lower quality (in my
opinion when using these cards in systems to capture images for
high-speed image processing). The difference is that it does no
compression in hardware. But I thought the original poster mentioned
using ffmpeg.

We also use a 4-channel card that compresses to jpeg-2000 in hardware.
Great linux support.

It is a mistake to confuse age with quality. In this area, new sometimes
means cheaper to make, or additional features (like compression) that do
not effect the basic image capture quality.

YMMV. 


-- 
Roger Oberholtzer

Ramböll RST/OPQ

Ramböll Sverige AB
Krukmakargatan 21
P.O. Box 17009
SE-104 62 Stockholm, Sweden

Office: Int +46 10-615 60 20
Mobile: Int +46 70-815 1696



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