Frames and Resolution Confusion at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon XA and VIXIA Series AVCHD Camcorders > Canon VIXIA Series AVCHD and HDV Camcorders

Canon VIXIA Series AVCHD and HDV Camcorders
For VIXIA / LEGRIA Series (HF G, HF S, HF and HV) consumer camcorders.


Reply
 
Thread Tools Search this Thread
Old August 12th, 2007, 08:21 PM   #1
Major Player
 
Join Date: Feb 2005
Location: kentucky, USA
Posts: 429
Frames and Resolution Confusion

When talking about 24p, I'm aware that this means 24 frames per second progressive. And I think I understand it (sort of).

And unless I am confused, I'm pretty sure that 1080i means one thousand, & eighty lines of resolution interlaced scan.
___________________________________________________________

My question here is when you are dealing with 24p, then what is the lines of resolution? It can't be 1080i because that is interlaced, right?.....so is it 1080p with 24p? I am a new HV20 owner and the reason this question has entered my mind is because I am reading info on HDV and HD in general and some times it will talk about frame rates and progresssive or interlaced, and other times it is only talking about the lines of resolution and whether it is interlaced or progressive. Can there be a mix of interlace and progressive when talking about frames and lines of resolution or are they automatically the same? Sorry if this is Confusing.

Last edited by Steve Witt; August 12th, 2007 at 08:23 PM. Reason: forgot to mention that I am a HV20 owner
Steve Witt is offline   Reply With Quote
Old August 12th, 2007, 08:45 PM   #2
Regular Crew
 
Join Date: May 2007
Location: Boston MA
Posts: 167
Each frame of either 1080i or 1080p resolution image will have the same resolution. The difference is that, one frame of 1080p image contains 1080 progressively scanned lines in it, whereas one frame of 1080i image contains two interlaced 'fields' consisting of 540 lines each and complementing each other. The eye (brain) puts the two fields together to make a full frame of 1080 lines of resolution.

P.
Pedanes Bol is offline   Reply With Quote
Old August 12th, 2007, 08:52 PM   #3
Regular Crew
 
Join Date: May 2007
Location: Boston MA
Posts: 167
HV20 creates 24 progressive frames per second in 24p mode but records it on tape embedded in a 60i stream (using 3:2 pulldown) in order to meet the HDV format requirements. So the resulting video has 30 full frames but still contains the original 24 progressive frames in it.

P.
Pedanes Bol is offline   Reply With Quote
Old August 12th, 2007, 08:54 PM   #4
Major Player
 
Join Date: Feb 2005
Location: kentucky, USA
Posts: 429
Quote:
Originally Posted by Pedanes Bol View Post
Each frame of either 1080i or 1080p resolution image will have the same resolution. The difference is that, one frame of 1080p image contains 1080 progressively scanned lines in it, whereas one frame of 1080i image contains two interlaced 'fields' consisting of 540 lines each and complementing each other. The eye (brain) puts the two fields together to make a full frame of 1080 lines of resolution.

P.
Ok, understood. Thanks. But when you are talking about the 1080i that means the frames(whatever the rate may be) are interlaced too, right? And when talkin about 1080p that means that the frames (whatever the rate) are progressive.....Is this correct.

I mean since the HV20 puts 1080i on your DV tapes, but you decided to record in 24p then do the 3:2 pulldown afterward what is the resolution then....is it 1080p?
Steve Witt is offline   Reply With Quote
Old August 12th, 2007, 08:58 PM   #5
Major Player
 
Join Date: Feb 2005
Location: kentucky, USA
Posts: 429
Quote:
Originally Posted by Pedanes Bol View Post
HV20 creates 24 progressive frames per second in 24p mode but records it on tape embedded in a 60i stream (using 3:2 pulldown) in order to meet the HDV format requirements. So the resulting video has 30 full frames but still contains the original 24 progressive frames in it.

P.
So it is packaged as 60i (meaning 60 fields per second) two fields to make 30 full frames per sec. And these 30 full fps only appear to look like 24p (smoke and mirrors)? And then the resolution is still 1080i?

Last edited by Steve Witt; August 12th, 2007 at 09:47 PM.
Steve Witt is offline   Reply With Quote
Old August 12th, 2007, 09:07 PM   #6
Regular Crew
 
Join Date: May 2007
Location: Boston MA
Posts: 167
If you look at your footage taken at 24p mode with your HV20, frame by frame, you will see 3 progressive frames + 2 interlaced frames per every five frame block. (3:2 pulldown). The final resolution is still 1080. I think your question is what to call this, 1080p or 1080i. It is technically called 1080i, but the pulldown can be reversed using special software (reverse telecine) and the original 24 progressive frames can be extracted. After that, I think you can call it a true 1080p (24p).

P.
Pedanes Bol is offline   Reply With Quote
Old August 12th, 2007, 09:11 PM   #7
Major Player
 
Join Date: Feb 2005
Location: kentucky, USA
Posts: 429
Quote:
Originally Posted by Pedanes Bol View Post
If you look at your footage taken at 24p mode with your HV20, frame by frame, you will see 3 progressive frames + 2 interlaced frames per every five frame block. (3:2 pulldown). The final resolution is still 1080. I think your question is what to call this, 1080p or 1080i. It is technically called 1080i, but the pulldown can be reversed using special software (reverse telecine) and the original 24 progressive frames can be extracted. After that, I think you can call it a true 1080p (24p).

P.
That helps Pedanes....Thankyou so much. Also, just found this link and it helps too.

http://www.microsoft.com/windows/win...sion_hdformats

Last edited by Steve Witt; August 12th, 2007 at 10:51 PM.
Steve Witt 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 XA and VIXIA Series AVCHD Camcorders > Canon VIXIA Series AVCHD and HDV Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 09:51 AM.


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