[opendtv] Re: Image quality
- From: Olivier Houot <olho_avatar_i@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 12 Nov 2005 00:20:10 +0100
Mark shubin wrote :
> This is not a 1080i vs. 720p issue. This is a 69 line pairs per
> millimeter (1920 pixels per line on an old 1-inch-format HD camera)
> vs.
> 184 lp/mm (the same 1920 on a 1/3-inch-format HD camera). A 12:1
> lens
> for the former cost $112k; a 10:1 lens for the latter, which requires
> roughly three times the resolving power of the former, is included in
>
>The glass in the 1-inch-format lenses was cooled over the course of
>months to reduce microfractures that could reduce MTF. That helped
>justify their extraordinary cost. Complete 1/3-inch HD camcorders are
>cheap. Yet they have lenses with three times the resolution of the
>1-inch format??? I don't THINK so.
Considering a human eye which is just a 2.5 cm diameter device, using a
high resolution sensitive region of only 1.5 mm, simple tiny optics
largely made out of water and jelly ,coupled with motor control and
processing ressources from just a fraction of the total brain volume,
manages to do better than high definition, we must clearly be doing
something wrong...
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