Diagonal striping on XL1 at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XL and GL Series DV Camcorders > Canon XL1S / XL1 Watchdog

Canon XL1S / XL1 Watchdog
Can't find it on the XL1 Watchdog site? Discuss it here.


Reply
 
Thread Tools Search this Thread
Old January 20th, 2003, 01:58 AM   #1
New Boot
 
Join Date: Jan 2003
Location: Draper, UT
Posts: 7
Diagonal striping on XL1

Anyone know what causes the diagonal striping betweens lines of contrast? For example, a sharp color next to white produces this striping when the camera is moving in a pan. Is this just typical of 4:1:1 video or are there prosumer camcorders that have resolved this problem?
__________________
Bill
Bill Heaner is offline   Reply With Quote
Old January 20th, 2003, 06:02 AM   #2
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,298
Only seen during pans or fast moving objects? Sounds like an interlace artifact.
Don Palomaki is offline   Reply With Quote
Old January 20th, 2003, 06:14 AM   #3
Warden
 
Join Date: Mar 2002
Location: Clearwater, FL
Posts: 8,267
Does it look like this? If so, it's as Don guessed, interlace artifact. You might want to search the topic using the search button in the upper right. The lines are more pronounced on a computer monitor because of the nature of the display.

Jeff
Jeff Donald is offline   Reply With Quote
Old January 20th, 2003, 01:10 PM   #4
New Boot
 
Join Date: Jan 2003
Location: Draper, UT
Posts: 7
Thanks for the comment, but, no, the artifact is seen during normal playback through the camera on a tv.
__________________
Bill
Bill Heaner is offline   Reply With Quote
Old January 20th, 2003, 02:48 PM   #5
Major Player
 
Join Date: Sep 2002
Location: Belgium
Posts: 804
If you see this "striping" only on slightly oblique area's while panning /tilting you probably see the "stairstepping" which relates to the sampling and (interlaced) line structure character of DV.
Longer shutter time settings reduce this effect by introduction of some extra motion blurr.
Andre De Clercq is offline   Reply With Quote
Old January 20th, 2003, 03:31 PM   #6
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,298
Can you post a captured frame with a sample of the effect for us to see.
Don Palomaki is offline   Reply With Quote
Old January 21st, 2003, 11:50 AM   #7
New Boot
 
Join Date: Jan 2003
Location: Draper, UT
Posts: 7
Don,
Thanks for your input...I'll work on getting a sample for you to take a look at. However, I am interested in the response from Andre. The "stairstepping" effect is what is happening and seems to relate to sampling. I will try the longer shutter speeds and post the results.

Andre,
Is this something that you see on your video? Also, do you know at what sampling rate this digital stairstepping smooths out? I came from an analogue (beta and 16mm film) background and do not like this problem that I am seeing with these 4:1:1 cameras.

Thanks a lot (Don, Andre and Jeff) for your thoughts on this. I am about to start work on a documentary series using digital for the first time and want to make sure that I understand the image limitations.
__________________
Bill
Bill Heaner is offline   Reply With Quote
Old January 21st, 2003, 03:08 PM   #8
Major Player
 
Join Date: Sep 2002
Location: Belgium
Posts: 804
Bill,
Sampling rates are fixed in DV. Yes I can see stairstepping in DV images. This belongs to the often mentioned "edge business" in digital images and manifests itself in different ways like stairstepping, twitter, straddling, moire ...all belonging to the domain of spatio-temporal aliasing effects. Reducing resolution also reduces aliasing effects and motion blurr is one of the ways to get this (if there is motion!). So keep your shutter at 1/60 when panning.tilting.
Andre De Clercq is offline   Reply With Quote
Old January 21st, 2003, 07:51 PM   #9
New Boot
 
Join Date: Jan 2003
Location: Draper, UT
Posts: 7
Many thanks Andre...sounds like you understand this issue. I'll keep your advice in mind.

Thanks again.
__________________
Bill
Bill Heaner 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 > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XL and GL Series DV Camcorders > Canon XL1S / XL1 Watchdog

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 07:42 AM.


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