Posted by
Martha Narro-2 on
Aug 22, 2005; 6:28pm
URL: http://imagej.273.s1.nabble.com/linear-Hough-transform-tp3690661p3690662.html
Dear All,
Thanks for the help. Fleur & Philipp sent me the plugin. Now that I have it
and see who the author is, I realize I could not get it with a Google search
because, although it comes up in the search, the link no longer works. I
will play with it. I will also look into Sobel operators as Dimiter
suggested. I'll have to do some reading. I already know that Laplacian edge
detection and skeletonization tend to miss the fine neuronal processes I am
trying to detect.
Thanks again,
Martha Narro
On Mon, 22 Aug 2005 11:04:55 +0200, Fleur Longuetaud
<
[hidden email]> wrote:
>Dear Dimiter,
>
>I'm also interested in the linear Hough Transform.
>By example, if I have four lines to detect in an image and I want their
>parameters (r, thêta), the Hough tranform gives me these parameters, no ?
>Is it possible with a Sobel operator to easily estimate the line
>parameters ?
>Best regards,
>
>Fleur
>
>Prodanov, D. (FYS) a écrit :
>
>>Dear Martha,
>>
>>Why don't you try conventional edge-detection with liner filters ( say
Sobel)? It
>>is already implemented in ImageJ. I am not sure how the Hough transform
handles images with
>>degraded geometric forms (e.g. noisy images). The other thing you can try
is to
>>threshold the images and then skeletonize them.
>>
>>best regards
>>
>>Dimiter
>>
>>Date: Fri, 19 Aug 2005 12:44:48 -0700
>>From: Martha Narro <
[hidden email]>
>>Subject: linear Hough transform
>>
>>Hello All,
>>
>>I need to detect faint linear signal (fine processes on neurons) in images.
>>I wanted to try using a linear Hough transform. In the listserv archives a
>>"Linear_Hough_Transform_.class plugin" is mentioned, but I can not find it.
>>Can someone tell me where it is (the source code)? If the source code for
>>this plugin is not available, I wondered if someone could tell me if it
>>would be relatively easy to convert the Hough Circles plugin to detect
>>lines or if that would be a bad way to go about things.
>>
>>Thanks,
>>Martha Narro
>>
>>
>>
>>
>
>
>--
>Fleur LONGUETAUD
>Centre INRA de Nancy
>EQUIPE QUALITE DES BOIS
>Laboratoire d'Etude des Ressources Forêt-Bois
>UMR INRA-ENGREF
>F-54280 CHAMPENOUX (France)
>
>
http://www.nancy.inra.fr/lerfob/>=========================================================================