Re: High Definition TV UK FAQ


"Jan B" <nospam@xxxxxxxxx> wrote in message
news:43e641a8.306240640@xxxxxxxxxx
On Sun, 5 Feb 2006 10:40:10 -0000, "Jim" <Jim@xxxxxxxxxxxx> wrote:

I have updated the HDTV UK FAQ with some info about which HD cameras the
BBC
have been using and a table of distance vs screen size vs HD format

I agree to the common rule of thumb that says we can resolve about 1
arcminute (1degree/60).

My comment is that you should include a little "safety margin" when
calculating what pixel size is needed on a certain distance.
I don't want to be able to resolve the very sharp pixels in an LCD
panel.

My own tests give me a maximum wanted pixel size around 0.85 arc
minute to get a smooth picture on my LCD-TV (and based on the native
LCD resolution).

That corresponds to a pixel size of 0.5mm x 0.5mm viewed from 2m.
(I can begin to see the pixels at 1.8m but not from 2.3m. 0.5mm at
1.8m corresponds to 0.95 arcminute, and then the picture does not look
smooth.)


It sounds like you have better than 20/20 vision. That is not unusual. Your
numbers would correspond to about 20/12 vision.
I may add in more rows to the table for better vision when I next update it.


.

Relevant Pages

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