Increased Upper Airway Collapsibility During Sleep

Publisher Summary This chapter discusses some techniques for recognizing structures in pictures. The research aims to develop techniques whereby a machine may observe its surroundings and then use its observations to achieve goals in an effective and efficient manner. To fulfill such requirements, the machine will inevitably use knowledge gained from past experience and observation to plan its activities, and also to interpret its sensory data. The chapter discusses the idea of a finite relational structure, that is, a set of elements with given properties and relations among them, as a useful mathematical tool for describing pictures, and to describe general techniques for matching such structures against each other. The matching process for relational structures attempts to find whether one structure occurs in or is a substructure of another structure. More precisely one need a function that assigns to each element of the first structure a distinct element of the second structure in such a way as to preserve the properties and relations which subsist in the first structure.