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From: djones@awesome.berkeley.edu (David G. Jones)
Newsgroups: comp.graphics
Subject: Re: Re: Workstations that can record/play realtime video
Message-ID: <32598@ucbvax.BERKELEY.EDU>
Date: 15 Nov 89 23:47:59 GMT
Article-I.D.: ucbvax.32598
References: <6509@portia.Stanford.EDU> <1360003@hpspcoi.HP.COM> <7645@ttidca.TTI.COM>
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In the recent discussion of NTSC bandwidth, Steve Schear adds his 2 cents:

In article <7645@ttidca.TTI.COM> schear@ttidca.tti.com (Steve Schear) writes:
> .... The eye appears to notice little of
>this psychophysical magic due to, among other things, the larger size and 
>wider spacing of the cones (as opposed to the rods) in the fovea of the retna.
>


There are *no* rods in the center of your fovea, besides rods are mostly
saturated in bright, daytime settings.  The cones in your fovea are about
1 second of visual angle apart, which is very well matched to your
resolution acuity of 60 cycles per degree - not what I'd call widely spaced.
The 3 different cone types do occur with different frequency, "blue" being the
least frequent.


the vision police.

djones@awesome.berkeley.edu