[vtkusers] Sobel Filter

[circass]

Hi David, thanx for your answer,

Actually i m trying to make an edge detection operation and i want to make
it repeatetly. 

I searched for it and find sobel Filter. is there any other filter you can
advice me ?

Thanx,
Circass


David Doria-2 wrote:
> 
> On Tue, Feb 9, 2010 at 8:53 AM, circass <circass at gmail.com> wrote:
> 
>>
>> Hi my friends,
>> i m trying to use sobel filter, it works at the first time but when i try
>> to
>> make a second filtering on filtered image it gives me an error about
>> scalar
>> component number. it says it can work with only one scalar component.
>>
>> Thanx, Circass.
>>
>>
> The problem is that vtkImageSobel2D produces a vector image:
> 
> vtkImageSobel2D <classvtkImageSobel2D.html> computes a vector field from a
> scalar field by using Sobel functions. The number of vector components is
> 2
> because the input is an image. Output is always doubles.
> 
> This "image" has a vector (more than one component) at each "pixel". This
> is
> why you can't filter it again. I actually don't understand though, I
> thought
> the Sobel filter just multiplied a mask such as
> 
> 1 0 1
> 2 0 2
> 1 0 1
> 
> at each pixel to come up with a scalar at each pixel?
> 
> Thanks,
> 
> David
> 
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