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Physiograms - with moving camera



 
 
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  #1  
Old October 27th 04, 12:05 PM
Barry Pearson
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Default Physiograms - with moving camera

I hope this is on-topic here.

I have uploaded 2 galleries of physiograms to my photography site. One has 40
images of physiograms, with the camera as well as the light bulb moving. The
other takes 20 of those original physiograms, and runs them through Photoshop
filters.

http://www.barry.pearson.name/photography/

I have uploaded a few web pages describing how the original physiograms were
taken. One of the pages describes how the combined motions add up to
interesting effects.

http://www.barry.pearson.name/articles/physiograms/

The original physiograms were taken while I was at school, 40 years ago! Were
they a one-off? Does anyone know of any similar photographic images?

--
Barry Pearson
http://www.barry.pearson.name/
http://www.birdsandanimals.info/


  #2  
Old October 27th 04, 03:11 PM
Nicholas O. Lindan
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"Barry Pearson" wrote

I have uploaded 2 galleries of physiograms to my photography site. One has 40
images of physiograms, with the camera as well as the light bulb moving.

http://www.barry.pearson.name/photography/

The original physiograms were taken while I was at school, 40 years ago! Were
they a one-off? Does anyone know of any similar photographic images?


Also known as 'Lissajous curves'. They were often made with two signal
generators and an oscilloscope or modified TV set: "You are now entering
the Twilight Zone..." These days they are digital:

http://www.math.com/students/wonders...lissajous.html

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/
  #3  
Old October 27th 04, 03:11 PM
Nicholas O. Lindan
external usenet poster
 
Posts: n/a
Default

"Barry Pearson" wrote

I have uploaded 2 galleries of physiograms to my photography site. One has 40
images of physiograms, with the camera as well as the light bulb moving.

http://www.barry.pearson.name/photography/

The original physiograms were taken while I was at school, 40 years ago! Were
they a one-off? Does anyone know of any similar photographic images?


Also known as 'Lissajous curves'. They were often made with two signal
generators and an oscilloscope or modified TV set: "You are now entering
the Twilight Zone..." These days they are digital:

http://www.math.com/students/wonders...lissajous.html

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/
  #4  
Old October 27th 04, 03:21 PM
Barry Pearson
external usenet poster
 
Posts: n/a
Default

Nicholas O. Lindan wrote:
"Barry Pearson" wrote

I have uploaded 2 galleries of physiograms to my photography site.
One has 40 images of physiograms, with the camera as well as the
light bulb moving.

http://www.barry.pearson.name/photography/

The original physiograms were taken while I was at school, 40 years
ago! Were they a one-off? Does anyone know of any similar
photographic images?


Also known as 'Lissajous curves'. They were often made with two
signal generators and an oscilloscope or modified TV set: "You are
now entering the Twilight Zone..." These days they are digital:
http://www.math.com/students/wonders...lissajous.html


Some of them are indeed Lissajous figures. Most are not.

One of the articles I mentioned explains how the shapes are formed. It
describes 3 types. One simply involves putting the camera on a record
turntable! Another set are Lissajous figures. The most interesting and complex
figures are twin-elliptical figures. (Lissajous figures are a limiting case of
twin-elliptical figures, of course, but I separated them out).

The extended set is described in:
http://www.barry.pearson.name/articl...ams/shapes.htm

There is also a spreadsheet at that page that will draw Lissajous figures and
twin-elliptical figures.

--
Barry Pearson
http://www.Barry.Pearson.name/
http://www.BirdsAndAnimals.info/


 




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