Bubbles and Dents, Dynamic

[From Bill Powers (2004.05.16.1152 MST)]

To all reversal fans:

Martin Taylor sent me a scan of his bubbles-and-dents fields, and I have
incorporated it into a control task. The bitmap is as long as the program,
so I fear this is a 500K+ file, but grin and bear it. As usual, Delphi
source code is included, as well as the executable file, BubDentPr.exe. Be
sure that the bitmap file, BubbleDent.bmp, is in the same directory as the
executable file.

This program uses the mouse to transition smoothly between the original
image and its negative. Click and drag the slider to see the effect. I have
found that when I am seeing the original as bumps, the negative looks like
dents, and vice versa, which is very informative. You will also notice that
the ENTIRE FIELD of bumps or dents changes together when there is a
perceptual switch: whatever the nature of the perceptual input function,
it's being applied across the whole visual field simultaneously, not just
to individual identifiable configurations. This puts the mathematics
immediately far over my head. Could Karl Pribram have been right in saying
the brain is like a hologram? One wonders what would happen if we isolated
just part of the field and did the reversing there, leaving the rest alone.
would the reversed part reverse when there's a perceptual switch?

There's no disturbance in this task yet; I thought interested parties would
want to start playing with it right away. While you do that, I'll go back
and complete the Necker cube demo, which is close to finished.

All my work with handling images with Delphi for my satellite tracking
project has paid off -- it took me only half a day to get this working.

Best,

Bill P.

BubDent.ZIP (478 KB)

[From Rick Marken (2004.05.16.1330)]

Bill Powers (2004.05.16.1152 MST)--

To all reversal fans:

Martin Taylor sent me a scan of his bubbles-and-dents fields, and I have
incorporated it into a control task. The bitmap is as long as the program,
so I fear this is a 500K+ file, but grin and bear it.

Sounds like fun. But when I try to unzip it I get an error. So I haven't
been able to see it yet.

Best

Rick

[From Bill Powers (2004.05.16.1718 MST)]

Rick Marken (2004.05.16.1330)--

Sounds like fun. But when I try to unzip it I get an error. So I haven't
been able to see it yet.

I've rezipped the files and am resending them.

Best,

Bill

BubDent1.ZIP (55 Bytes)

[Martin Taylor 2004.05.16.22.25]

[From Bill Powers (2004.05.16.1718 MST)]

Rick Marken (2004.05.16.1330)--

Sounds like fun. But when I try to unzip it I get an error. So I haven't
been able to see it yet.

I've rezipped the files and am resending them.

The first one worked fine for me (I unzipped on the Mac and copied
the folder over to my virtual PC). My experience with it so far is
that I see only bubbles, even as the contrast switches polarity back
and forth! (only a couple of minutes observation, but that's strange
enough.

Martin

[From Bill Powers (2004.05.16.2109 MST)]

Martin Taylor 2004.05.16.22.25 --

My experience with it so far is that I see only bubbles, even as the
contrast switches polarity back and forth! (only a couple of minutes
observation, but that's strange enough).

I can now report three of the four possible experiences: all dents, all
bubbles, and switching back and forth between bubbles and dents with
bubbles corresponding to the slider all the way to the left. So far, seeing
bubbles with the slider all the way to the right hasn't happened yet.

The two extremes are not quite the same; the dents have sharper edges and
brighter highlights with the slider to the right. I did a little tweaking
of the transition, but more could probably be done.

Now that I've got the Dynamic Necker Cube more or less finished, I'll go
back and add a disturbance to the bubbles and dents.

Any suggestions, anyone?

Best,

Bill P.