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 pixelswith 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.