PASCAL stands for pattern analysis,statistical modeling and computational learning. It is an EU Network of Excellence funded under IST Programme of the European Union.
pattern: A pattern is essentially an arrangement. It is characterized by the order of the elements of which it is made, rather than by the intrinsic nature of these elements.
individual image regions are called objects or patterns
A pattern is an arrangement of descriptors. The name of feature is used often in the pattern recognition literature to denote a descriptor. A pattern class is a family of patterns that share some common properties.