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I am working on some algorithm implementation, however being new to image processing, I have some questions about some of the definitions used. UPDATE: for those asking for more information, this is the RELEVANT information stated in the paper.

"Step 4: Centerline Computation Our implementation of the centerline extraction is based on the Distance Transform with thinning as post-processing step as proposed by niblack. The result is a binary mask image g with a centerline thickness of 1, which corresponds to the undirected edge image graph." Then :

  • They(in the paper) keep on mentioning a node without prior definition, this means a truepoint with 2 other trueneighbors(out of 8). Am I right ? (this is the general definition of a node pixel)

  • They define an Edge being the distance between two adjacent nodes where the distance between them is $\leq \sqrt2 $. What do they mean by that exactly ?

  • Last they define saddle points being node pixels with the connected edge length has to be $\geq 3$. I don't know what they mean by that

Update: Paper: ROCHADE: Robust Checkerboard Advanced Detection for Camera Calibration

I would like someone having more experience than I do to guide me through these definitions. I can not post the algorithm paper online due to copyright.

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  • $\begingroup$ Usually when someone is citing an article it is good to mention it. This ensures getting best possible answer... $\endgroup$ – jojek Feb 11 '15 at 8:46
  • $\begingroup$ @jojek sorry my bad I thought i did mention it $\endgroup$ – Engin007 Feb 11 '15 at 8:54
  • $\begingroup$ @jojek did you find anything ? I really need to understand this because then I know what to do instead of guessing aimlessly. $\endgroup$ – Engin007 Feb 11 '15 at 23:37
  • $\begingroup$ It will be hard for anyone to give you answers as we can not access the paper, nor did you explained the problem and the context in details. $\endgroup$ – Bálint Fodor Feb 15 '15 at 18:11
  • $\begingroup$ @BálintFodor I have added some more information. This is the relevant part and more information is not provided. Hopefully it is helpful $\endgroup$ – Engin007 Feb 15 '15 at 19:03

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