Pattern recognition characteristic extraction method and apparatus

A feature extraction and pattern recognition technology, applied in the field of pattern recognition, can solve problems such as not being a censoring criterion, introducing individuals, etc.

Inactive Publication Date: 2008-12-31
INST OF AUTOMATION CHINESE ACAD OF SCI
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Problems solved by technology

However, in these methods, the number of selected features is usually pre-specified, which is bound to introduce personal subjectivity, so it is not a good censoring criterion

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  • Pattern recognition characteristic extraction method and apparatus
  • Pattern recognition characteristic extraction method and apparatus
  • Pattern recognition characteristic extraction method and apparatus

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Embodiment Construction

[0038] In order to better understand the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] Feature extraction is to select the most important feature combination to minimize the amount of information loss. From a practical point of view, it can save a lot of classification processing time.

[0040] The present invention proposes a feature extraction method and device based on a new truncation criterion, which is mainly for feature extraction of discrete variables. In this feature extraction method and device, a new form of joint contribution based on mutual information is defined, and the threshold value of the specified joint contribution is used instead of the specified number of features as the censoring criterion for feature extraction, and the extracted joint contribution is greater than or The combination of feature variables equal to the set joint contribution thres...

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Abstract

The invention discloses a method for extracting characteristics in pattern recognition which aims at effectively avoiding subjectivity of pre-selecting the number of characteristics manually in previous characteristic extracting and a device thereof. The characteristic extracting method comprises the steps of: determining and preprocessing discrete characteristic variables and class variables according to original information of a sample pattern, setting a joint contribution rate threshold value, determining a joint contribution rate of a combination of the characteristic variables and the class variables and obtaining the combinations of the characteristic variables with the joint contribution rate more than or equal to the set joint contribution rate threshold value. The characteristic extracting device comprises a numerical value preprocessing module, a threshold value setting module, a joint contribution rate determining module and a characteristic extracting module. The method and device for extracting characteristics in pattern recognition of the invention can be widely used for extracting the characteristics of discrete digital image information, fingerprint information, face print information, voice message or handwritten/printed character information, etc.

Description

technical field [0001] The invention relates to the field of pattern recognition, in particular to a feature extraction method and device in pattern recognition. Background technique [0002] A pattern is information with time and space distribution obtained by observing specific individual things; the category to which a pattern belongs or the overall pattern in the same category is called a pattern class (or class for short). "Pattern recognition" is to divide the patterns to be recognized into their respective pattern categories on the basis of some certain measurements or observations. [0003] The research on pattern recognition mainly focuses on two aspects, that is, how to study how organisms (including people) perceive objects, and how to use computers to realize pattern recognition under a given task. [0004] A computer pattern recognition system basically consists of three interrelated but distinct processes, namely data generation, pattern analysis, and pattern ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46
Inventor 西广成孙占全
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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