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How to detect tree annual ring contour?

Posted by panovr on Feb 24, 2010; 2:53am
URL: http://imagej.273.s1.nabble.com/How-to-detect-tree-annual-ring-contour-tp3688927.html

Hi,
  I have a tree Cross-sectional image:
[http://www.flickr.com/photos/47804888@N07/4383897306/in/photostream/]
  I want to process the image to obtain
the result as:
[http://www.flickr.com/photos/47804888@N07/4383138069/in/photostream/]
  So, I want to write a custom ImageJ plugin to complete
the task automatically or semi-automatically.
  In concretely, I need to do these:
  1. detect the tree annual ring contour
  2. draw a horizontal line through tree center
  3. compute the intersect point between the horizontal line and the every
annual ring.
  4. draw vertical line from every intersect point, so I can obtain
experimental data from the blue background image.  
  I have some thought:
  1. do contrast enhancement
  2. do edge detection to find the annual ring
  3. transform the edge image to binary image using threshold method.
  4. draw a horizontal line through tree center
  5. compute the intersect points
 
  Any suggest is appreciate.