Digital Image Processing 121 Patterns and Pattern Classes a pattern is an arrangement of descriptors The name 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 propertiesDigital Image Processing 12.1 Patterns and Pattern Classes • A pattern is an arrangement of descriptors • The name 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