1920 or 1440?

C

Chap

New member
I'm sorry for asking such a newbie question, but all the literature I keep finding when I do a google search just says 1080i. It doesn't specify whether this camera has the ability to do 1920x1080i or 1440x1080i.

Can someone please tell me which? Thank you.
 
http://en.wikipedia.org/wiki/Pixel_aspect_ratio

(Do NOT confuse with display resolution)


HD has a 1.3333 pixel aspect ratio meaning that on displays where pixels are square (LCD/TFT/Computer), the HD will look like 1
1920x1080 is 1080i at 1:1 pixel aspect ratio (PAR) and 1440x1080 is HD at 1.33333 PAR.

1080i is captured at 1440 but displayed on a TFT at 1920...
 
So if I want it to be true 1920x1080 I need to upconvert what this camera captures then? Ok.
 
No camera under $200,000 records 1920x1080, that I can think of off the top of my head. You have to go to HDCAM SR to get 1920x1080.

HDV, HDCAM, and DVCPRO-HD all prefilter the signal and record less than 1920x1080.
 
Barry_Green said:
No camera under $200,000 records 1920x1080, that I can think of off the top of my head. You have to go to HDCAM SR to get 1920x1080.
Click to expand...
Indeed, though that may have to be rewritten in a little while when such as Red and possibly Infinity start shipping.

But most important to realise is that these figures are RECORDING resolutions - they represent a theoretical maximum resolution. They say nothing about what the camera front end is capable of, and the resolution of that may start to tail off well before the limitations imposed by the recording system. Beware of simple headline numbers with all cameras.
 
I've read about prefiltering in Barry's book. What is the difference between prefiltering and compression, (aside from where it may occur in the recording process)? Is prefiltering considered lossless?

Perhaps it's hard to know if it is some proprietary implemention in the DSP, but I curious about this nevertheless.
 
Not lossless by any means. It's just basically scaling. It would certainly be considered lossy.

However we are traditionally a lot more sensitive to resolution changes on the vertical axis instead of the horizontal. So people have been getting away with prefiltering on the horizontal for years with few if any complaints.
 
Barry_Green said:
However we are traditionally a lot more sensitive to resolution changes on the vertical axis instead of the horizontal. So people have been getting away with prefiltering on the horizontal for years with few if any complaints.
Click to expand...
I'd also understood a lot had to do with interlace, go to progressive scanning and my understanding was that symmetry returned.
 
The sensor is 960x540, it uses pixel shifting to take it to 1280x1080, and when you view it, it interpolates it to 1920x1080. You notice no difference in horizontal and vertical resolution. And since it's 960x540, it's 16:9. Not 4:3 like most HDV cameras.

If you want 1920x1080, get JVC's new HDV HDD 3CCD Everio or Canon's HV10. I think I heard that Sony's FX7 or V1 is 1920x1080.
 
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