Frangi filter acting as an edge detector

Question

I tried to extract all the stems from the plant image using the Frangi filter. I wanted to use the property that each stem has more characteristics of the vessel than the leaf. Use of this article as reference .

My input image is

And this is my matlab code snippet

 options=struct('FrangiScaleRange', [1 3], 'FrangiScaleRatio', 1, 'FrangiBetaOne', 0.5,...
       'FrangiBetaTwo', 2, 'verbose',true,'BlackWhite',true);
      [outIm,whatScale,Direction] = FrangiFilter2D(double(rgb2gray(img2)), options);
      outIm = uint8(outIm/max(outIm(:))*256);

This is the conclusion.

I know that there can be other ways to solve this problem, but I'm just interested to know why this approach does not work.

Answer 1

Frangi- , , , .

: (i) ( , ), (ii) .

, 5 10 20 30 Frangi beta=0.5 c=100

[Frangi et al.: , MICCAI 1998]

:

http://i.stack.imgur.com/s6wuE.jpg, -8bpp Photoshop.

, . , . , .

EDIT:

http://i.stack.imgur.com/eZwxg.png. " " , :

• 3-D : , .
• 2-D : , , .

• : , .

Answer 2

Frangi , , , "", "". , ( ), , ( ). , , . :

(a) futz ( matlab, , FrangiAlpha .FrangiBeta). 0.5, , ( , ).

(b), @dasdingonesin , , Hough , Frangi.