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## Re: Not getting Poisson Noise in octave

**From**: |
c. |

**Subject**: |
Re: Not getting Poisson Noise in octave |

**Date**: |
Mon, 3 Dec 2012 04:56:00 +0100 |

On 3 Dec 2012, at 00:05, Terry Duell wrote:
>* You could also try something like this...*
>* *
>* bb = aa + 3/256*randn(h,w);*
>* where h,w are the height, width of aa.*
>* *
>* The first approach takes 13.74 sec here, for my little test image. The second *
>* takes about 0.01 sec.*
>* The results appear quite similar, but I guess it depends on your particular *
>* need.*
that is equivalent to
bb = imnoise (aa, 'gaussian', 0, sqrt(3/256))
which works the same in Matlab and Octave, the version I proposed
is equivalent to
bb = imnoise (aa, 'poisson')
which is not yet implemented in Octave:
http://octave.sourceforge.net/image/function/imnoise.html
http://www.mathworks.it/it/help/images/ref/imnoise.html
whether it is equivalent to use either of the two indeed depends on the OP's
particular application.
>* -- *
>* Regards,*
>* Terry Duell*
c.

**Not getting Poisson Noise in octave**, *Sivahari Nandakumar*, `2012/12/02`
**Re: Not getting Poisson Noise in octave**, *c.*, `2012/12/02`
**Re: Not getting Poisson Noise in octave**, *Sivahari Nandakumar*, `2012/12/02`
**Re: Not getting Poisson Noise in octave**, *Terry Duell*, `2012/12/02`
**Re: Not getting Poisson Noise in octave**, *Carnë Draug*, `2012/12/02`
**Re: Not getting Poisson Noise in octave**, *Terry Duell*, `2012/12/02`
**Re: Not getting Poisson Noise in octave**, *Carnë Draug*, `2012/12/02`
**Re: Not getting Poisson Noise in octave**, *Terry Duell*, `2012/12/02`
**Re: Not getting Poisson Noise in octave**,
*c.* **<=**
**Re: Not getting Poisson Noise in octave**, *Terry Duell*, `2012/12/02`
**Re: Not getting Poisson Noise in octave**, *c.*, `2012/12/03`
**Re: Not getting Poisson Noise in octave**, *Terry Duell*, `2012/12/03`
**Re: Not getting Poisson Noise in octave**, *c.*, `2012/12/03`
**Re: Not getting Poisson Noise in octave**, *Carnë Draug*, `2012/12/04`