From: Wolfgang Moser (womo_at_news.trikaliotis.net)
Date: 2008-05-18 16:18:19
Hello list, Micha,
these are my final two rows handcrafted with
Photoshop since I'm losing horribly against
the autostitcher tools, it seem ;-)
http://d81.de/shared/vic-ii/03_row_11to10.png
For the third row (first one in this picture)
I used an edge alpha blending that was cut
half way. Originally it was of double the
size and then moved beyond the edge, because
I thought that it wouldn't work right. But
when I stitched the pieces together along
with luminance blending each pair of layers,
I saw that sharp edges were still detectable
by the human eye.
So for the next row I took the edge alpha
mask that was not cut and got a result where
no one should be able to tell, where exactly
pieces were put together.
Michael Huth schrieb:
> Hmm, I took a look into ptgui, some panoramic tool for fotos again and
> got it working that it stitches the horizontal images.
Hmmm, I saw a lot of these PTxxx tools coming
along with hugin. Maybe I just used the wrong
GUI.
> The tool is not perfectly suitable for this, because for typical
> panoramas all photos are taken from the same spot, whereas in this case
> the camera moves.
> But I think I got it right after several hours.
Maybe the Mifare hackers explicitly mentioned
to set the camera's angle within the tool to
0.1 degree or lower. It did it set to 0.01
degree and in the previews I couldn't see any
sperical deformation.
> I put together a layered photoshop image (not psd, since this has a 2 GB
> limit, but TIFF works fine).
> A low quality version (4 of 12 in photoshop) as JPEG can be found here:
> http://mail.lipsia.de/~enigma/vic2/fullvic4.jpg
> Please note that the typical browser complains about errors, this is not
> true. The image is just a bit hmm bigger with 17780x19800.
> On low mem systems you might want to open it in a scratch disk using app
> like photoshop.
Great job, I got it already and had a look
into. None of my standard viewer tools was
able to open it without memory faults, but
Photoshop did it again.
> Just to save you some work, do you think the panorama tool did a job
> comparable good to manual stitching?
Except for the sperical deformations, yes,
I would say. The blending could work a bit
better since I was able to see some piece's
edges. But only, because I knew where to
look for.
In either case the resulting image should
be good enough so that later analysts and
reverse-engineers don't get disturbed by
stitching artefacts.
>> fragments.
>> May I ask, if want to address this sometime? Maybe
>> redoing the whole imaging work with reduced vertical
>> stepping size or just supplying the missing parts?
>>
> Hmm it would mean that I have to take another set of images with one
> line less maybe and a y-start offset of 0.25 mm.
> You think the small gaps could have essential information?
I don't know since I'm definitely no
microelectronics engineer that knows what
to look for and knowing what's needed and
what's not.
In either case, your current work surely
was a huge step into revealing the last
unknowns of the VIC-II chip. Even if some
parts of the chip were not photographed,
well educated engineers are surely be able
to reconstruct missing parts, if desperately
needed.
Womo
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