[sdiy] OT: video processing, noise through swept BPF

[rkmoore at memphis.edu]

The continuity was intentional.  I took a single noise image and used 
it for all of the processing (instead of different noise images for 
each frame).  I changed the center frequency of the filters in small 
1/8th octave steps (or something close to it) because I wanted to see 
the image "move" as the cutoff frequency changed.  Kind of like when 
you put noise through a high resonance filter and sweep the frequency.  
You can here an almost sinusoidal oscillation with the overshoot of the 
cutoff of the filter.  It seems to work for the first second or two of 
the movie.  The last bit just kind of looks like noise again, 
though :)  I did it with MATLAB at school using a program I had to 
write for some summer work.

Richard

----- Original Message -----
From: "mcb, inc." <mcbinc at panix.com>
Date: Friday, July 22, 2005 7:22 pm
Subject: Re: [sdiy] OT: video processing, noise through swept BPF

> On Fri, 22 Jul 2005, rkmoore at memphis.edu wrote:
> 
> > https://umdrive.memphis.edu/rkmoore/public/weirdness/new1.avi
> >
> > Take a look and tell me what you think.  Kind of low res and 
> dry, I
> > know, but kind of neat, too.  Given time I could layer different 
> noises,> make the filters closer together, and give the layers 
> different colors.
> > That should look nice.
> 
> Fun start.  Reminds me of Turning's morphology work or the intro
> to, what was it, 'Amp' or 'Liquid Television' or that video of the
> non-linear properties of a starch suspension getting hit with
> sound.  You seem to have some inter-frame continuity.  Accidental
> or intentional?
> 
> m
> 
> --
> Monty Brandenberg
>