Are the Sensor's Pixels Really Rectangular? at DVinfo.net
DV Info Net

Go Back   DV Info Net > High Definition Video Acquisition > General HD (720 / 1080) Acquisition
Register FAQ Today's Posts Buyer's Guides

General HD (720 / 1080) Acquisition
Topics about HD production.

Reply
 
Thread Tools Search this Thread
Old May 8th, 2008, 01:30 AM   #1
Trustee
 
Join Date: Mar 2007
Location: Sherman Oaks, CA
Posts: 1,259
Are the Sensor's Pixels Really Rectangular?

I realize that HDV is actually 1440 not 1920 pixels wide. So it's said that to cover the space that 1080 X 1920 square pixels would cover, HDV uses rectangular pixels.

But out of curiosity, do HDV sensors acutally use physically rectangularly shaped pixels? Or do they use slightly anamorphic lenses that squish 1920 into [edit] 1440?

It's just something I've been wondering about. Thanks.

Last edited by Peter Moretti; May 8th, 2008 at 11:53 AM.
Peter Moretti is offline   Reply With Quote
Old May 8th, 2008, 07:58 AM   #2
Obstreperous Rex
 
Join Date: Jan 2001
Location: San Marcos, TX
Posts: 27,368
Images: 513
Quote:
Originally Posted by Peter Moretti View Post
I realize that HDV is actually 1440 not 1920 pixels wide.
Just like HDCAM, the single most popular HD tape format in the world and the most widely accepted format for HD broadcast masters... 1440.

Quote:
do HDV sensors acutally use physically rectangularly shaped pixels? Or do they use slightly anamorphic lenses that squish 1920 into 1080?
You mean "squish 1920 into 1440," but the answer is no. There are a variety of image sensors used for various HDV camcorders... there is no single standard or single type of implementation. For example on Canon 3CCD HDV camcorders such as the XL and XH series, those CCDs are 16:9 rectangular in shape, with 1440 pixels on the horizontal axis and 1080 pixels on the vertical axis, and they are rectangular pixels. But that's not all there is to the story, because those cameras also use H-axis Pixel Shift, which provides a significant boost in resolution. It's never "just" about the number of pixels on the chip.
__________________
CH

Search DV Info Net | 20 years of DVi | ...Tuesday is Soylent Green Day!
Chris Hurd is offline   Reply With Quote
Old May 8th, 2008, 11:51 AM   #3
Trustee
 
Join Date: Mar 2007
Location: Sherman Oaks, CA
Posts: 1,259
Chris, right.

I honestly was not trying to start another pixel shifting or 1440 vs 1920 thread.

I'm really just curious if the pixels are physically rectangular or if the lens makes them effectively so, similar to how Hawk's anamorphic films lenses work.

http://en.wikipedia.org/wiki/Anamorphic

But it sounds like none of them use anamorphic lenses, it's done by the sensor.

P.S. Thanks for catching the typo ;).
Peter Moretti 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...

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

Scan Computers Int. Ltd.
+44 0871-472-4747
Bolton, Lancashire UK


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 > High Definition Video Acquisition > General HD (720 / 1080) Acquisition


 



All times are GMT -6. The time now is 02:52 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2024 The Digital Video Information Network