[opendtv] Re: The curse of Bayer pattern sensors
- From: Bob England <bobedot@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 8 Feb 2014 12:40:49 -0800
Going back to the linked article, we note that John Galt was with
Panavision at the time (not Panasonic; gotta watch those Panas) and the
article is described as a "wide-ranging, no-holds barred conversation" from
2009 (not 2005).
Bob England
On Sat, Feb 8, 2014 at 9:11 AM, Alan Roberts <
roberts.mugswell@xxxxxxxxxxxxxx> wrote:
> Terribly ancient news, I'm afraid. It's been one of the subjects I lecture
> on for at least 20 years.
>
> A
>
>
> On 08/02/2014 16:16, Mark Schubin wrote:
>
>> A real issue, to be sure, but old news. John presented it at the HPA
>> Tech Retreat in 2005.
>>
>> For tomorrow's news, come to this year's Tech Retreat, February 17-21:
>> http://hollywoodpostalliance.org/?page_id=5978
>>
>> TTFN,
>> Mark
>>
>> On 2/8/2014 10:08 AM, Olivier Houot wrote:
>>
>>> This interesting discussion by John Galt of Panasonic exposes a logical
>>> flaw of the design i was not aware of :
>>>
>>> http://library.creativecow.net/galt_john/John_Galt_2K_4K_
>>> Truth_About_Pixels/1
>>>
>>> In short red and blue pixels have half the density of green ones.
>>> Hence they provide half the sampling frequency of green ones.
>>> You are supposed to have a low pass optical filter in front of your
>>> sensor at half the sampling frequency.
>>> If you optimize it for green, you let aliasing frequencies for red and
>>> blue in.
>>> If you optimize for red/blue, you throw away half the green bandwidth
>>> (essentially luminance).
>>>
>>> To me, it means a properly filtered 4K sensor would have a practical 2K
>>> resolution.
>>>
>>>
>>> Also inside the discussion, the story of how Imax engineers measured the
>>> resolution of their system to be less than 4K, and other interesting
>>> bits.
>>>
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