Re: Not getting Poisson Noise in octave

[Terry Duell]

On Sun, 02 Dec 2012 18:53:41 +1100, c. <address@hidden> wrote:

> On 2 Dec 2012, at 06:13, Sivahari Nandakumar wrote:
>
> > Hi all,
> >
> > I am not getting imnoise(j,'poisson') in octave. My friends have it in  
> > Matlab. Is there any alternative for it in Octave?
>
> according to what I see in matlabs imnoise docs you could try something  
> like:
>
> aa = imread ("someimage.jpg");
> bb = uint8 (arrayfun (@poissrnd, aa));
> subplot (1, 2, 1)
> imshow (aa)
> subplot (1, 2, 2)
> imshow (bb)
>
> beware, it may take some time ...

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.

Cheers,
--
Regards,
Terry Duell