O'Reilly logo

Classification, Parameter Estimation and State Estimation, 2nd Edition by David M. J. Tax, Dick de Ridder, Ferdinand van der Heijden, Yaobin Zou, Ming Feng, Guangzhu Xu, Bangjun Lei

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

3Detection and Classification

Pattern classification is the act of assigning a class label to an object, a physical process or an event. The assignment is always based on measurements that are obtained from that object (or process, or event). The measurements are made available by a sensory system (see Figure 3.1). Table 3.1 provides some examples of application fields in which classification is the essential task.

images

Figure 3.1 Pattern classification.

Table 3.1 Some application fields of pattern classification

Possible
Application field measurements Possible classes
Object classification
Sorting electronic parts Shape, colour ‘resistor’, ‘capacitor’, ‘transistor’, ‘IC’
Sorting mechanical parts Shape ‘ring’, ‘nut’, ‘bolt’
Reading characters Shape ‘A’, ‘B’, ‘C’
Mode estimation in a physical process
Classifying manoeuvres of a vehicle Tracked point features in an image sequence ‘straight on’, ‘turning’
Fault diagnosis in a combustion engine Cylinder pressures, temperature, vibrations, acoustic emissions, crank angle resolver ‘normal operation’, ‘defect fuel injector’, ‘defect air inlet valve’, ‘leaking exhaust valve’,
Event detection
Burglar alarm Infrared ‘alarm’, ‘no alarm’
Food inspection Shape, colour, temperature, mass, volume ‘OK’, ‘NOT OK’

The definition of the set of relevant classes in a given application is in some cases given by ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required