[gephex-user] Another new module: Infinite Impulse Response image filter

[JS]

Hi,

It'd be nice if you could port those plugins into the Frei0r plugin 
framework. The framework was made mostly by the Gephex crew but is also 
supported by many other open source softwares. See this site for details:
http://www.piksel.org/Frei0r

Cheers,

++ js

binary millenium wrote:
> Here's another filter that implements an IIR filter on input video:
>
> http://bmillenium.sourceforge.net/zimagefiltermodule.zip
>
> Source and windows dlls provided, I'll provide linux x86 libs for this 
> and the earlier modules soon.
>
> The filter has two buffers of size four, one stores the current input 
> image and also buffers of the input image for three samples into the 
> past and also stores three copies of the output image for three 
> samples into the past.  8 coefficients sum all these buffered images 
> up into one combined new output frame (which is then buffered for use 
> in the next time step).
>
> The general equation where y is the output image, x is the input 
> image, and xn is the current image and xn-1 the image from one 
> timestep back is:
> yn = (a0*xn + a1*xn-1 + a2*xn-2 + a3*xn-3  - b1*yn-1 - b2*yn-2 - 
> b3*yn-3) / b0
>
> If you know a thing or two about filter design you can make custom 
> low-pass, high-pass, or band-pass filters.  
>
> It would be possible to extend the length of the buffers, but there's 
> a large performance hit just for the current size.  The code is 
> currently fairly ugly and I probably didn't make it as efficient as it 
> could be (it unnecessarily buffers an extra output image that is 
> unused for instance).  
>
> -bm
>
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>
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++ js