[ATM] A foucault puzzle

[Dale Eason]

This is not the image that came off the camera it has
been compressed.  The original was 1meg BMP with no
compression and looks the same.

I also have interferograms and the fringes go right
through the hole.  They do not do that on the mirror
on the left.

http://doeason.home.comcast.net/igrams/2_6inch_igrams.jpg

Something very strange is going on.

Dale
--- Michael Lindner <mikell at optonline.net> wrote:

> Dale Eason wrote:
> >
>
http://doeason.home.comcast.net/foucault_images/2_6inch_foucault.jpg
> 
> Just a shot in the dark, but if you took this with a
> web cam, and this 
> is the image as it came off the camera, I'd look for
> a software bug. The 
> image on the right has a severe case of compression
> artifacts, as can be 
> seen by the obvious 8x8 pixel blocks that make it
> up. I'd guess the JPG 
> compression software on the camera can't handle
> something about the 
> frequency of the waviness in the mirror and
> completely mis-compressed 
> it. Of course, I may be way off base, but I'd try a
> different camera. 
> You should definitely not be getting any return
> signal from the hole.
> 
> -- 
> Michael Lindner
> http://www.starastronomy.org ***
> http://home.att.net/~mikel
> http://www.atmsite.org *** http://www.atmlist.net
> 


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