Eric Bazan89646
Well-known member
Yes.
In addition to the horizontal banding, there's also more
of the 'clumpy' or 'blocky' noise (as Peter pointed
out). Look at the overall texture of blue in the sky,
especially in the upper left hand corner of the image.
It's obvious once you know what to look for - no
need to enhance to image to see it (at least
on my monitor).
To my eyes it's a very annoying noise. You can
also see it in the picture of the Toyota dragster,
in the panel above the Mechelin man.
If you look at phil's samples, look at the picture
of the train station. If you look at closer train on the
right you can see this blocky noise quite prominently.
So the sensor definitely has sensitivity issues. Remember,
each 'pixel' in the fahvulon (as I like to call it) has nearly
triple the number of transistors compared to a bayer
device. This means a greater percentage of the area
in each pixel is 'dead' (not sensitive to light). The
foveon folks had to wait and implement the chip
using the .18 micron process to in order to scale down
this fill factor. This also means if they are ever able
to implement the chip using a smaller feature size
(than .18) that things will improve as the fill factor
will take up a smaller percentage of each pixel.
The triple layer design, while conceptually elegant, still
has to prove itself in 'the real world' (tm). There
also appear to be 'issues' with the reds being a little
weak in low light
-Eric
In addition to the horizontal banding, there's also more
of the 'clumpy' or 'blocky' noise (as Peter pointed
out). Look at the overall texture of blue in the sky,
especially in the upper left hand corner of the image.
It's obvious once you know what to look for - no
need to enhance to image to see it (at least
on my monitor).
To my eyes it's a very annoying noise. You can
also see it in the picture of the Toyota dragster,
in the panel above the Mechelin man.
If you look at phil's samples, look at the picture
of the train station. If you look at closer train on the
right you can see this blocky noise quite prominently.
So the sensor definitely has sensitivity issues. Remember,
each 'pixel' in the fahvulon (as I like to call it) has nearly
triple the number of transistors compared to a bayer
device. This means a greater percentage of the area
in each pixel is 'dead' (not sensitive to light). The
foveon folks had to wait and implement the chip
using the .18 micron process to in order to scale down
this fill factor. This also means if they are ever able
to implement the chip using a smaller feature size
(than .18) that things will improve as the fill factor
will take up a smaller percentage of each pixel.
The triple layer design, while conceptually elegant, still
has to prove itself in 'the real world' (tm). There
also appear to be 'issues' with the reds being a little
weak in low light
-Eric
I cannot see this banding on the original (on my monitor). However,
after adjusting the contrast, some slight banding does indeed show
up.
The banding seems to appear all over the sky. I also inspected the
channels, and the banding is most visible in the red channel, also
appearing in the green channel, but not visible in the blue channel.
Speaking for myself, this doesn't bother me since I had to tweak
the image to the limits in order to see it.
Geir Rune
