ABSTRACT
The focus of this chapter is on spatial interrelation-based shape feature extraction techniques. Different techniques such as adaptive grid resolution, bounding box, convex hull, chain code, smooth curve decomposition, ALI based representation, beam angle statistics, shape matrix, shape context, chord distribution and shock graph are explained in this chapter. Different methods to generate chain code such as basic, differential, resampling, vertex and chain code histogram are also discussed. Various techniques to create shape matrices like square model and polar model are explained step by step. The benefits and limitations of each method are discussed in this chapter. All the techniques are easy to understand for those who are new to the research field as most of the techniques are described with equations and pictorial representations.
