P3D Re: "Too much depth"

[George Themelis <gthemelis@xxxxxxxxx>]

--- John W Roberts <roberts@xxxxxxxxxxxxxxxxx> wrote:

> I would recommend that we use a distinct term to identify the
> maximum recommended depth for an image based on the disparity 
> of the infinity points of the two images (and therefore the 
> ability to fuse). 

Good recommendation.  This disparity is usually called
deviation.  "Excessive" deviation is the scientific term for
"too much depth".  However, as you pointed out, the measurement
of deviation is relative.  You must have a reference point.  A
good reference point is the "stereo window".  Unfortunately,
mounting affects the position of the stereo window and hence the
deviation.  For example, you can take a perfectly good stereo
Realist slide and mount it in such way that it is totally
unviable because of excessive deviation.  

Another way would be to take into account the deviation between
the near and far objects in the image.  This makes it
independent of mounting but it does not tell us what happens
when the image is actually viewed.

Another problem is that the limits of deviation (what defines
"excessive") are relative to the viewing method.  More
magnification of the stereo image means that less
"excessiviness" can be tolerated.

The bottom line is that you can quantify depth via the
stereoscopic deviations but "excessive" would be very difficult
to define in a general manner.


=====
George Themelis (DrT-3d@xxxxxxxxxxxxxxxx)
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