By Wilhelm Burger
This can be the second one quantity of a ebook sequence that offers a contemporary, algori- mic creation to electronic picture processing. it truly is designed for use either via beginners wanting a ?rm beginning on which to construct and practitioners looking for serious research and smooth implementations of crucial innovations. This up-to-date and better paperback version of our compreh- sive textbook electronic photo Processing: An Algorithmic procedure utilizing Java applications the unique fabric right into a sequence of compact volumes, thereby s- porting a ?exible series of classes in electronic snapshot processing. Tailoring the contents to the scope of person semester classes can be an try to p- vide a?ordable (and “backpack-compatible”) textbooks with out comprimising the standard and intensity of content material. This moment quantity, titled center Algorithms, extends the introductory - terial awarded within the ?rst quantity (Fundamental recommendations) with extra innovations which are, however, a part of the normal photograph processing to- field. A forthcomingthird volume(Advanced ideas) will extendthis sequence and upload very important fabric past the undemanding point, compatible for an - vanced undergraduate or maybe graduate path.
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Extra info for Principles of Digital Image Processing: Core Algorithms (Undergraduate Topics in Computer Science)
The labels of the image elements along the contour, as well as the neighboring foreground pixels, are stored in the “label map” L (a rectangular array of the same size as the image) by the method FindNextPoint() in Alg. 6. 3 Implementation While the main idea of the algorithm can be sketched out in a few simple steps, the actual implementation requires attention to a number of details, so we have provided the complete Java source for an ImageJ plugin implementation in Appendix B (pp. 283–293). The implementation closely follows the description in Algs.
Therefore, when tracing a contour from a start point xS , returning to the start point is not a suﬃcient condition for terminating the contour tracing process. Other factors, such as the current direction along which contour points are being traversed, must be taken into account. 1); that is, to ﬁrst identify the connected regions in the image and second, for each region, proceed around it, starting from a pixel selected from its border. In the same way, an internal contour can be found by starting at a border pixel of a region’s hole.
If you were to place an elastic band around all the nails, then, when you release it, it will contract into a convex hull around the nails (Fig. 16 (b)). 9 The convex hull is useful, for example, for determining the convexity or the density of a region. The convexity is deﬁned as the relationship between the length of the convex hull and the original perimeter of the region. Density is then deﬁned as the ratio between the area of the region and the area of its convex hull. The diameter, on the other hand, is the maximal distance between any two nodes on the convex hull.