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rvc
Questions
by
on Nov 4, 2006 at 8:39:13 pm

"The new Canon XL H1 delivers 1080i HD resolution, "
http://www.usa.canon.com/app/html/XLH1/frame_rates_formats.shtml

"1.67M pixels each (1440 x 1080 effective per CCD)"
http://www.usa.canon.com/app/html/XLH1/specifications.shtml

How does one get 1920 unique samples per line out of an imager which has 1440 pixels per line? Confused

Does it strike anyone that Panasonic does not publish either the gross pixel count or the native resolution of the imagers in the new HVX200. At least they tell you it will sample at 4:2:2. Now if they would just tell us how often it samples at 4:2:2. Does anyone know? Confused

The Hot new Sony HDR-FX7 website says
"Record videos and stills in stunning true high-definition."

http://www.sonystyle.com/is-bin/INTERSHOP.enfinity/eCS/Store/en/-/USD/SY_Di...

With a gross pixel count of 1120K it may be fair to say the camera generates output which is in acordance with one of the ATSC HD formats but saying it RECORDS TRUE hd Shocked is a stretch unless 1440 by 1080 a new addition to the 18 formats?

Is there a camera out there with 3 native 16x9 imagers having 1920 by 1080 resolution which resolves at 14 bit minimum and samples at 4:2:2 or beter yet 4:4:2? Very Happy

Maybe it's the Canon HV10. What do ya think? Wink

Don't ya just love the marketing department! Rolling Eyes


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sstachiw
Re: Questions
on Feb 2, 2007 at 4:28:59 pm

Here is the official explanation from Sony:

The Red and Blue pixels are offset 1/2 a pixel from the green pixels on a 960x1080 image sensor. The 14 Bit DSP then converts this signal to a 1920x1080 4:2:2 image that is then passed to an HDV converter and converted to 1440x1080 before being put into the HDV engine for recording along with the audio in the MPEG2-TS file format and printed to tape.

All of the HD prosumer cameras sample at 4:2:2 at the image sensor. But, once again with HDV, the MPEG compression turns the image into a 4:2:0 sample. By using an intermediary codec, like cineform, you can uncompress the image back to 4:2:2. However, keep in mind that all you are doing is adding headroom with the extra color space as you have already lost whatever information was there before it was compressed.


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ClearVision Studios
Re: Questions
on Apr 6, 2007 at 12:16:06 am

Another idea is to do what we do and is capture directly out of the XL-H1's HD-SDI jack which bypasses the compression chip and delivers true uncompressed 1920 x 1080 4.2.2 video.


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