Re: Seitz Roundshot and QTVR technique

["thomas b. kunz" <tbk@xxxxxx>]

I agree with you Mike, If you said - the VideoBrush's technique - It makes
web-resolution panos VERY easy to make. I'd never used another, because it
so easy. Results are at www.tbk.de/galerie. Enjoy it!

Q: Do you, as Panoramists, call the Videobrush- technique a QTVR-technique
(pan'n'snap) if you don't present it with Apples-QTVR, but instead with
JAVA-Applets?
I think this should be seen more different, because there are a lot of
techniques to produce and show web-resolution panos on the Web. Agree?

Thomas




-----Ursprüngliche Nachricht-----
Von: Mike Sinclair <sinclair@xxxxxxxxxxxxx>
An: panorama-l@xxxxxxxxxxxxxxxxx <panorama-l@xxxxxxxxxxxxxxxxx>
Datum: Freitag, 6. November 1998 01:27
Betreff: FW: Seitz Roundshot and QTVR technique


Joshua eludes to the beauty of pan-scanning an image with a 1D sensor - with
either a 'slit' of film or a linear CCD. During my 2 yr. ownership of a
Roundshot, I religiously adjusted the nodal point adjustment rails to what
the computer told me. After a few weeks and getting lazy, I ignored the
adjustment and saw no difference in the images. This, in part was because of
the slit and part because I used a 14mm lens. I'd imagine if you were using
a significantly longer fl lens, objects violating the nodal point
calculation would appear horizontally blurred - their image components would
have a non-zero velocity with respect to the film.


As a side note:

A digital video camera's video can be processed to yield a true 720 x 2880
(lens dependent) x 360 panorama. VideoBrush's technique is more akin to the
pan'n'snap variety and produces inferior results (IMHO). If you violate the
nodal point rule (on purpose) that the pan'n'snap photographers are slave
to, you can get  truly stunning stereo panorama pairs - with only one camera
and one pass! Through computer processing, you can derive stereo pairs with
as much as a 12" (or more) IPD (distance between viewpoints). I'm hoping the
lab in which I used to work will soon make available or license this
software. It makes web-resolution panos VERY easy to make - much easier than
the snap'n'pan variety. Also, through multiple pans, pole-to-pole coverage
(360 x 180 degrees) is attainable. Another advantage of this technique is
the auto exposure capability as a function of pan angle (similar to what the
new RoundShots give you). This comes with every DV camera! I've seen image
compressions of 7+ stops while panning an interior next to a window with a
bright sunlit exterior view - both with good exposure. Almost all of the
pan'n'snap real estate pans suffer from "window burnout". Another advantage
is that you get about 60 pans per $20 digital tape - hard to beat compared
to FlashRam or film.

-Mike-




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