Re: Stereogram Billboards?

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>>I wrote:
>>"Perhaps I'm a bit unique when it comes to viewing 3D images, but I did 
>>some experiments with stereograms created with a cell size of 4 >inches. 
>>The purpose was to determine if the diminishment of distance would enable 
>>parallel viewing from a great distance and possibly make stereogram bill 
>>boards a possibility."

>Chuck Field wrote:
>  Ummm.... sounds cool, but... a bit scary too.  I just imagine that there'd 
>be too many accidents caused by too many folks trying to focus on the views 
>at 40 MPH.
>  Now maybe I only feel this way because I have so much trouble seeing SIRDS.
>  I can free view antique stereo views fine, though it still takes me up to 
>a minute to get them in focus.   BTW... when I free view stereo views, am I 
>doing it cross-eyed or parallel viewing?
>Thanx, it's just my 2 cents worth,
>Chuck Field  <ECF004@xxxxxxxxxxxxx>

Hi,

I thought about the safety issue too and explored it with a rep from one of
the bill board companies. He described a number of cases where something on
a billboard perhaps indirectly contributed to an accident. The
responsibility for driving still rests with the driver. He indicated that if
it were possible or easy to see stereogram billboards they wouldn't hesitate
to use them.

It turns out that few would be able to see them in stereo even parked and
with several hours to try. I am able to see them but it isn't as easy as
viewing a book or poster. There are too many possible distractions to the
attention necessary. I had to try it just for the experience but it doesn't
seem to be a practical pursuit.

Another fun but non-practical idea is to place stereogram markings on
pavement and view the blurred markings in crossed mode while driving and
using the hood of your car as the focal point. Perhaps with a stereogram of
a snake. It would appear to be literally in front of the car and above the
pavement. This could be used with rollercoaster rides too. It's the type of
special effect only available to those with a relatively easy facility at
seeing the different types of stereograms. On the down side, motion effects
would dictate a rather low resolution and the use of large image elements as
well as the fact that only a relatively small area of the image is available
at any given moment.

As to whether you are using crossed or parallel viewing it depends on your
natural abilities and the arrangement of the images. Several people I know
of seem to look at stereograms in a crossed mode before getting it right in
a parallel mode. If the images aren't too large or far apart, you are
probably using parallel. The determining factor is whether the apparent
image is in front of the actual image pair (crossed) or if it is behind the
actual images (parallel).

Thanks for the comments,




Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/


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