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Discussion Groups | Image Signal Processing | Impulse Noise and Edges

Technical Discussions related to Image Processing (image coding, compression, digital effects, mpeg, etc)

  

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Impulse Noise and Edges - Indhumathi Chandrasekaran - Oct 4 8:30:36 2006



Hi,
   
   Iam trying to perform diffusion filter to remove the noise. But my way is I need to select
only the corrupted pixels based on some thresholding and diffuse only those pixels. But since
both the noise and edges are having highest gradient i don't know how to differentaite the
noise from the edges.
   
  Any suggestions please...
   
  Thanks,
  Indhu


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Re: Impulse Noise and Edges - bala...@jasmin-infotech.com - Oct 17 8:37:35 2006

Hai,
     By analyzing neighbourhood pixels information, we can differentaite the noise from the
edges. Based on the Complexity of analysis, we will get better  results.

If i am wrong, anybody can correct it.

thanks,
balabharathi

Hi,
>   
>   Iam trying to perform diffusion filter to remove the noise. But my way is I need to
select only the corrupted pixels based on some thresholding and diffuse only those pixels. But
since both the noise and edges are having highest gradient i don't know how to differentaite
the noise from the edges.
>   
>  Any suggestions please...
>   
>  Thanks,
>  Indhu


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Re: Impulse Noise and Edges - Ayyamperumal Narayanasamy - Oct 19 8:49:04 2006

Hai,
   
  Follow this & try once, it may help 
   
  1.apply a edge filter (Edge image you will get)
  2. Substract the edge from original image
  3. Then apply your algorithm
   
  Kindly do correct me if it is wrong
   
  Regards
  Ayyams

b...@jasmin-infotech.com wrote:
          Hai,
By analyzing neighbourhood pixels information, we can differentaite the noise from the edges.
Based on the Complexity of analysis, we will get better results.

If i am wrong, anybody can correct it.

thanks,
balabharathi

Hi,
> 
> Iam trying to perform diffusion filter to remove the noise. But my way is I need to select
only the corrupted pixels based on some thresholding and diffuse only those pixels. But since
both the noise and edges are having highest gradient i don't know how to differentaite the
noise from the edges.
> 
> Any suggestions please...
> 
> Thanks,
> Indhu


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Re: Impulse Noise and Edges - praveenkumar yethapu - Oct 19 8:49:06 2006

This can be true if the noise is Salt and Pepper noise. But, for other noise like Guassian
noise it cannot be true.
                                                                   PRaveen Kumar Y

b...@jasmin-infotech.com wrote:                                                  Hai,
  By analyzing neighbourhood pixels information, we can differentaite the  noise from the
edges. Based on the Complexity of analysis, we will get  better results.
  
  If i am wrong, anybody can correct it.
  
  thanks,
  balabharathi
  
  Hi,
  >   
  > Iam trying to perform diffusion filter to remove the noise. But my  way is I need to
select only the corrupted pixels based on some  thresholding and diffuse only those pixels. But
since both the noise  and edges are having highest gradient i don't know how to differentaite 
the noise from the edges.
  >   
  >  Any suggestions please...
  >   
  >  Thanks,
  >  Indhu
  >
  >


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Re: Impulse Noise and Edges - bala...@jasmin-infotech.com - Oct 26 9:23:03 2006

Hai,
   This method will work for impulse noise. Am i correct?
balabharathi

This can be true if the noise is Salt and Pepper noise. But, for other noise like Guassian
noise it cannot be true.
>                                                                   PRaveen Kumar Y
>
>b...@jasmin-infotech.com wrote:                                                  Hai,
>  By analyzing neighbourhood pixels information, we can differentaite the  noise from the
edges. Based on the Complexity of analysis, we will get  better results.
>  
>  If i am wrong, anybody can correct it.
>  
>  thanks,
>  balabharathi
>  
>  Hi,
>  >    
>  >  Iam trying to perform diffusion filter to remove the noise. But my  way is I need
to select only the corrupted pixels based on some  thresholding and diffuse only those pixels.
But since both the noise  and edges are having highest gradient i don't know how to
differentaite  the noise from the edges.
>  >    
>  >   Any suggestions please...
>  >    
>  >   Thanks,
>  >   Indhu
>  > 
>  >


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"Salt & pepper ", noise reduction - przemyslawmackowiak - Oct 30 9:26:52 2006

Hi.

How can I detect corrupted pixels? I don't want filter an whole image, 
but only coruppted pixels. I consider 'salt & pepper' noise

Thanks


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Re: "Salt & pepper ", noise reduction - paulraj bob - Oct 31 8:45:14 2006

Median filtr would be the best choice and determine
the auto correlation co-efficients for determining
corrupted pixels.
regards
Bob

--- przemyslawmackowiak
<p...@yahoo.com> wrote:

> Hi.
> 
> How can I detect corrupted pixels? I don't want
> filter an whole image, 
> but only coruppted pixels. I consider 'salt &
> pepper' noise
> 
> Thanks


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