You still dont get it. The oversampling is good for removing
information that the algorithms put there because they give frequency
components that results from the pixel pitch.
Yes, they do filter the sensor optically (diffusing) but more pixels
may be better because you get better contrast. They may still do this
on a 10MP sensor because some lenses has enough resolution to need
it, but not to the same extent. This is, by the way, one of the
reasons why digital lenses need other qualities than resolution. To
some degree resolution make problems.
DagT
Den 1. okt. 2005 kl. 02.21 skrev Herb Chong:
the information isn't there in the first place because it is
blocked by the lower quality lens. that is what i said at the
beginning. a lower quality lens that is just acceptable on the
*istD doesn't benefit from a larger sensor because it is already
band limiting the signal to something less than the Nyquist
frequency of the *istD sensor. in addition, there is a low pass
filter in front of the sensor to greatly reduce the chance of
aliasing. i seriously doubt that Pentax is going to omit a band
pass filter on a 10MP sensor. raising the sensor resolution without
raising the lens resolution to match by using better lenses means
that larger prints won't be any sharper on the new sensor. why go
to a larger sensor if you aren't going to crop more or enlarge more?
Herb...
----- Original Message ----- From: <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, September 30, 2005 7:24 AM
Subject: Re: Pentax Future? What's next for Pentax...
You are wrong. The problem you get without oversampling is the
information you dont have, and that is the information between the
pixels. The lacking information gives multiple solutions and those
produce several harmonic spatial frequencies. That's why DA
converters etc use a lot of tricks to avoid folding, to reduce the
number of unwanted solutions. Oversampling is a very simple
approach, and is what you get if you have more pixels than necessary.
