24 megapixels versus 12, substantial diff.

In article , David J
Taylor says...

The sensor, filter and lens all have an MTF, as does the Bayer processing.
All the same - the transfer function at a certain cycles per mm (or
whatever unit you choose). Of course, you need to measure the MTF in the
same spatial units, but it doesn't matter what those spatial units are.

The sensor is a discrete sampler and for practical purposes you consider
it the source of the signal. All other things, the AA filter, the lens
and Bayer interpolation have an impact on the high frequency content.
--

Alfred Molon
------------------------
Olympus 50X0, 8080, E3X0, E4X0, E5X0, E30 and E3 forum at
http://tech.groups.yahoo.com/group/MyOlympus/
http://myolympus.org/ photo sharing site

Alfred Molon wrote:
In article , David J
Taylor says...

The sensor, filter and lens all have an MTF, as does the Bayer
processing. All the same - the transfer function at a certain cycles
per mm (or whatever unit you choose). Of course, you need to
measure the MTF in the same spatial units, but it doesn't matter
what those spatial units are.

The sensor is a discrete sampler and for practical purposes you
consider it the source of the signal. All other things, the AA
filter, the lens and Bayer interpolation have an impact on the high
frequency content.

If you want to know the overall performance of the system, all the
components must be taken into account. Changes in the MTF before and
after the sensor can have distinctly different effects on the image,
though. I'm thinking aliasing here.

Cheers,
David

Alfred Molon wrote:
In article , David J
Taylor says...

The sensor, filter and lens all have an MTF, as does the Bayer processing.
All the same - the transfer function at a certain cycles per mm (or
whatever unit you choose). Of course, you need to measure the MTF in the
same spatial units, but it doesn't matter what those spatial units are.

The sensor is a discrete sampler and for practical purposes you consider
it the source of the signal. All other things, the AA filter, the lens
and Bayer interpolation have an impact on the high frequency content.

He didn't say different. He just said the choice of units does not
matter (as long as you are consistent).


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