Figure 2
Techniques used in WingGram. (a) The fast marching algorithm for detecting the boundary of a domain. (b) cardinal directions to find new white pixels in the fast marching algorithm. (c) All directions to find new black pixels in the fast marching algorithm. (d) The fast marching algorithm may miss the point if only the cardinal directions check for finding new black pixels. (e) Percolating to neighbour domains may occur if the fast marching algorithm checks all the directions for finding new white pixels. (f) Ramer-Douglas-Peucker line simplification algorithm. (g–k) Assignment of wing corrugations. (g) The wing image. (h) Highlighted corrugated spots. (i) The secondary image (divided into several sections). (j) Assignment of sections to the main image. (k) The developed corrugated model. (l) Defined conditions for the identification of vein junctions. (m–q) Suitable and non-suitable images. (m) fade image. (n) Dark image. (o) Appropriate image. (p) Thin and unclear venations. (q) Salt and pepper noise.
