Is DV 720i ?? 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 May 6th, 2003, 03:03 PM   #1
Regular Crew
 
Join Date: Apr 2003
Location: Waterbury, CT
Posts: 101
Is DV 720i ??

Just as the question says. Is the resolution taken from the vertical or horizontal?
__________________
Dumb Guy.
Brendan Getchel is offline   Reply With Quote
Old May 6th, 2003, 03:08 PM   #2
Major Player
 
Join Date: Mar 2003
Location: Vallejo, CA
Posts: 263
I thought that designation has always referred to Horizontal Resolution making DV 480i.
__________________
"USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." -David Letterman
Garret Ambrosio is offline   Reply With Quote
Old May 6th, 2003, 04:03 PM   #3
Wrangler
 
Join Date: Dec 2002
Location: Mays Landing, NJ
Posts: 11,542
Actually I thought "horizontal" refers to the number of pixels per scan line (720) and "vertical" refers to the number of scanlines (480)... but I'm still new at all this stuff :-)

I was under the impression that 720i was 720x1080, presumably anamorphic 16:9 but that's always been a source of confusion for me too. Maybe someone can post a link to a website that explains all these different standards?
Boyd Ostroff is offline   Reply With Quote
Old May 6th, 2003, 04:27 PM   #4
Major Player
 
Join Date: Mar 2003
Location: Vallejo, CA
Posts: 263
Boyd, I think you may be right...but isn't it L X W Length meaning vertical (720) Width being horizontal(480) and the designation refers to horizontal resolution since this is what they usually use a standard of measurement? I don't know...someone else please help!!
__________________
"USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." -David Letterman
Garret Ambrosio is offline   Reply With Quote
Old May 6th, 2003, 04:33 PM   #5
High School Student
 
Join Date: Apr 2003
Location: Canton, Ohio, USA
Posts: 609
Nope.

DV and standard TV broadcasting is 480i. There are 2 kinds of HD, 720P and 1080i, people are still debating on whether 720P or 1080i is better.
Alex Knappenberger is offline   Reply With Quote
Old May 6th, 2003, 05:11 PM   #6
Regular Crew
 
Join Date: May 2003
Location: Madison, WI
Posts: 123
480i = SD (DV & DVD), 720 x 480, 60 fields per second.
480p = SD, 720 x 480, 24, 30, or 60 frames per second.
720p = HD, 1280 x 720, 24, 30, or 60 frames per second.
1080i = HD, 1920 x 1080, 60 fields per second.

Some people include the field/frame rate in the designation, like "720/30p" or "1080/60i".

///d@
Dennis Adams is offline   Reply With Quote
Old May 6th, 2003, 06:13 PM   #7
Major Player
 
Join Date: Mar 2003
Location: Vallejo, CA
Posts: 263
Ah so I was right...hehe, so the desgination does refer to the horizontal resolution and some will include the frame rate. 480i would be interlaced 720 X 480. In this case there is no debate, obviously, speaking of resolution, and resolution alone, 1080i is better than 720i.
__________________
"USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." -David Letterman
Garret Ambrosio is offline   Reply With Quote
Old May 6th, 2003, 07:19 PM   #8
Wrangler
 
Join Date: Dec 2002
Location: Mays Landing, NJ
Posts: 11,542
Well I hope somebody that really knows will clear this up, cause I still think that 480 is *vertical* resolution (eg: the number of lines that are resolved when you move from the top to the bottom of the screen in the vertical direction).

When they give camcorder specs they mention the number of horizontal lines that are resolved. For example, the PD-150 has a stated horizontal resolution of 530 lines. I thought this meant that you could see (theoretically) 530 dots in a row across the 720 pixel width of the screen. Otherwise this spec wouldn't make much sense because the image only contains 480 scan lines.

So I think that VERTICAL resolution refers to the number of scanlines (480) and HORIZONTAL resolution refers to the number of pixels (720) on each line. This matches the terminology used on Adam Wilt's website as well...
Boyd Ostroff is offline   Reply With Quote
Old May 6th, 2003, 07:24 PM   #9
Regular Crew
 
Join Date: May 2003
Location: Madison, WI
Posts: 123
<<<-- Originally posted by Garret Ambrosio : In this case there is no debate, obviously, speaking of resolution, and resolution alone, 1080i is better than 720i. -->>>

There is no ATSC spec for 720i; all the 720 line formats are progressive.

///d@
Dennis Adams is offline   Reply With Quote
Old May 6th, 2003, 07:32 PM   #10
Major Player
 
Join Date: Mar 2003
Location: Vallejo, CA
Posts: 263
Arghh, this is more difficult than I thought. Wouldn't scan lines be the horizontal resolution? Anyone?
__________________
"USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." -David Letterman
Garret Ambrosio is offline   Reply With Quote
Old May 6th, 2003, 09:49 PM   #11
Warden
 
Join Date: Mar 2002
Location: Clearwater, FL
Posts: 8,267
NTSC video has 525 lines from the top of the screen to the bottom of the screen. These lines are referred to as vertical resolution because they are counted vertically, from top to bottom. This number is fixed by the NTSC spec.

Horizontal resolution is measured or expressed as a number of black to white transitions or lines that can be differentiated (resolved). The lines run vertically but are counted across (horizontally). Horizontal resolution is limited by the bandwidth of the video signal or the equipment (lenses, chips, tape etc.).
__________________
Jeff Donald
Carpe Diem




Search DVinfo.net for quick answers | Where to Buy? From the best in the business: DVinfo.net sponsors
Jeff Donald is offline   Reply With Quote
Old May 7th, 2003, 06:36 AM   #12
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
What you are all talking about is the VERTICAL resolution
(480i, 720p, 1080i etc.)
__________________

Rob Lohman, visuar@iname.com
DV Info Wrangler & RED Code Chef

Join the DV Challenge | Lady X

Search DVinfo.net for quick answers | Buy from the best: DVinfo.net sponsors
Rob Lohman 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 10:26 PM.


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