[Insight-users] Binary Image segmentation

[gkaremore at scai.fraunhofer.de]

yes I have tried with HoughTransform2DLinesImageFilter to extract 2D lines
from binary image, But it is not able to detect correct lines , in fact it
detects falls lines.

I think the parameter variance of the accumulator blurring (default = 5)
and  radius of the disk to remove from the accumulator (default = 10) has
to be set properly . Can any body tell me the significance of these
parameter with respect to hough transform. I also would like to know on
what criterion it has to set so as to get correct line detection.

My input image is binary consisting of a square (lines are in white color)
with black background.

My command line arguments are: input.png out.png 4 3 8


I have tried with number of combination of last two parameters, but no
significant change occurs.

Any help will be appreciated ....

Sincerely
Gopal



Dan Homerick wrote:
> I haven't done any work with feature extraction yet, and so won't be able
> to
> lend much, if any, assistance.
>
> I can suggest that, for the benefit of others on the list, you provide
> more
> details about what you've already tried and the problems that you've had.
> Am
> I correct in assuming that the "Feature Extraction" tool(s) that you've
> tried includes the
> HoughTransform2DLinesImageFilter<http://www.itk.org/Doxygen32/html/classitk_1_1HoughTransform2DLinesImageFilter.html>?
> In what way(s) are the results not appreciable?
>
> Cheers,
>  - Dan
>
> On 8/2/07, gkaremore at scai.fraunhofer.de <gkaremore at scai.fraunhofer.de>
> wrote:
>>
>> Hello Dan
>>
>> Thanks for your effort in understanding the problem. I meant by word
>> segmenting is not with respect to medical(or other)image processing, my
>> application is Document image segmentation. In another words , It would
>> be
>> called as multiclass labeling problem. Please see following papers
>> related
>> to binary image segmentation.
>>
>> Bayesian decision feedback for segmentation of binary images
>> Kadaba, S.R.; Gelfand, S.B.; Kashyap, R.L. Acoustics, Speech, and Signal
>> Processing, 1995. ICASSP-95., 1995 International Conference on
>> Volume 4, Issue , 9-12 May 1995 Page(s):2543 - 2546 vol.4
>>
>> Strzelecki M., Segmentation of Binary Images Using Network of
>> Oscillators,
>> 2 Krajowa, Konferencja Komputerowe Systemy Rozpoznawania KOSYR 2001,
>> 28-31
>> May 2001
>>
>> Especially papers from "International Journal of Document Analysis and
>> Recognition (IJDAR) - Computer Imaging, Vision, PR and Graphics "
>>
>> My criterion to cluster is Shape:
>>
>> I want rectangular,square, and horz and verticle line component to be
>> labbled in separation to Text and graphics on the document(Under
>> segmentation/clustering/labeling).
>>
>> currently I am trying with "Feature extraction" section of ITK toolbox.
>> Results are not appreciable. So looking for a different approach using
>> ITK
>> library.
>>
>> Thanks in advance.
>>
>> Sincerely
>> Gopal
>>
>>
>> Dan Homerick wrote:
>> > Hi Gopal,
>> >
>> > I'm not sure if I understand what you mean by segmenting a binary
>> image.
>> > "Segmentation" is typically reducing a grayscale or color image so
>> that
>> > only
>> > a few values are used, done in such a way that each color in the
>> resulting
>> > image has some semantic meaning. If you're starting with a binary
>> image,
>> > there's not much segmentation that can be done.
>> >
>> > It sounds like what you really want is to cluster (unconnected)
>> components
>> > of your binary image into logical objects. By what criteria do you
>> want
>> to
>> > cluster them (spatial proximity, similarity of size, shape, other)? I
>> > don't
>> > think there will be a simple filter to accomplish that, but if you can
>> > provide more details of what you intend to do, the mailing-list may be
>> > able
>> > to provide some guidance.
>> >
>> > Cheers,
>> >  - Dan
>> >
>> > On 8/2/07, gkaremore at scai.fraunhofer.de <gkaremore at scai.fraunhofer.de>
>> > wrote:
>> >>
>> >> Dear All
>> >>
>> >> Does ITK help in segmenting binary images. In another words ITK
>> >> segmentation library provides function to segment only gray scale and
>> >> color image. Will ITK helpfull in segmenting binary images in  to
>> >> different clusters. (Tried Binary threshold filter, connected
>> component
>> >> algorithms).
>> >>
>> >> Is there any other method by which we can segment binary image in
>> ITK.
>> >>
>> >> Any comments would be appreciable.
>> >>
>> >> Sincerely
>> >> Gopal
>> >>
>> >> Research Scholar
>> >> Fraunhofer Institute
>> >> Germany
>> >> _______________________________________________
>> >> Insight-users mailing list
>> >> Insight-users at itk.org
>> >> http://www.itk.org/mailman/listinfo/insight-users
>> >>
>> >
>>
>>
>