Video Noise at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Open DV Discussion
For topics which don't fit into any of the other categories.


Reply
 
Thread Tools Search this Thread
Old October 23rd, 2003, 11:50 AM   #1
Regular Crew
 
Join Date: Oct 2003
Location: San Diego, CA USA
Posts: 163
Video Noise

How does video noise occur? Is underexposure the only factor? I know video noise when I see it, but I don't know how to explain the cause of it in technical terms. Please help.
Jason Chang is offline   Reply With Quote
Old October 23rd, 2003, 12:38 PM   #2
Regular Crew
 
Join Date: Oct 2003
Location: San Diego, CA USA
Posts: 163
Video Noise

I've found the answer to my own question.

http://www.cctv-information.co.uk/constant2/sn_ratio.html


Here is a good article on signal-to-noise ratio and it explains the subject very well.
Jason Chang is offline   Reply With Quote
Old October 23rd, 2003, 12:57 PM   #3
Major Player
 
Join Date: Aug 2002
Location: Phoenix, AZ
Posts: 202
Interesting article, but as far as the under-exposed type of noise you mentioned, are you talking about the red and blue fuzz in the black areas, and he general fuzz everywhere else? That may be caused by your gain level. If you're using a Canon XL or GL series, you've got four choices, +0, +6, +12, or +18. In my opinion, any amount of gain causes unacceptable noise. So I always use the manual setting of 0 gain, and if there's not enough light, I get some light or put away the camera and or go home. The cause, as I understand it, is gain takes what light you have and electonically bumps it up. The processor doesn't know what to do when it bumps up underexposed scenes and fills in the blanks with noise.

So, there's noise due to electronic interference (like the article), and then there's the noise created by the gain.
Alex Dunn is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 05:27 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network