Examples
In character recognition, features may include horizontal and vertical profiles, number of internal holes, stroke detection and many others.
In speech recognition, features for recognizing phonemes can include noise ratios, length of sounds, relative power, filter matches and many others.
In spam detection algorithms, features may include whether certain email headers are present or absent, whether they are well formed, what language the email appears to be, the grammatical correctness of the text, Markovian frequency analysis and many others.
In all these cases, and many others, extracting features that are measurable by a computer is an art, and with the exception of some neural networking and genetic techniques that automatically intuit "features", hand selection of good features forms the basis of almost all classification algorithms.
Read more about this topic: Feature (pattern Recognition)
Famous quotes containing the word examples:
“No rules exist, and examples are simply life-savers answering the appeals of rules making vain attempts to exist.”
—André Breton (1896–1966)
“Histories are more full of examples of the fidelity of dogs than of friends.”
—Alexander Pope (1688–1744)
“There are many examples of women that have excelled in learning, and even in war, but this is no reason we should bring ‘em all up to Latin and Greek or else military discipline, instead of needle-work and housewifry.”
—Bernard Mandeville (1670–1733)