Re: Edge Enhancement

Posted by gankaku on
URL: http://imagej.273.s1.nabble.com/Edge-Enhancement-tp5003576p5003582.html

Hi Sidnei,

I am not sure if this will be a solution you are looking for, but have you
considered unsharp masking (>Process > Filters > Unsharp Mask...).
Another possibility might be the "Contrast Detection from the BioVoxxel
Toolbox if you tick the option "enhance edges in original". This method
applied grayscale erosion and dilation to enhance edges and thereny might
lead to stronger edge enhancement than the unsharp mask but can also induce
artifacts if overdone.

kind regards,
Jan


2013/6/22 Sidnei Paciornik <[hidden email]>

> Hi Jan
> I guess this is not quite the answer.  I don't need edge detection, but
> edge enhancement. I couldn't figure how either of your hints would do it.
> The algorithm should be simple. Take a neighborhood, calculate min, max,
> and range R.
> Pick a threshold T.
> If T>R it is not an edge, keep input pixel.
> Else exchange pixel with max or min.
>
> I just don't know how to program it.
> Any other hints?
> Thank you.
>  Em 22/06/2013 04:24, "Jan Brocher - BioVoxxel" <[hidden email]>
> escreveu:
>
>> Hi Sidnei,
>>
>> There is a plugin called Image Edges from Thomas Boudier (I think it is
>> not included in Fiji by default but available on the following site:
>> http://imagejdocu.tudor.lu/doku.php?id=plugin:filter:edge_detection:start
>> ).
>> Another possibility would be the "Edges" in FeatureJ from Eric Meijering
>> which enables you to suppress "halo" effects. To my knowledge both plugins
>> apply Canny edge detection based algorithms.
>>
>> regards,
>> Jan
>>
>>

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