By P.W. Becker
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Additional info for An Introduction to the Design of Pattern Recognition Devices
Region. At each step it is checked that the percentage of C1~patterns that thus far has not 64 6. Decision Procedures and Indices of Performance been classified does exceed 100·R N_P%. (v) Sooner or later micro-regions containing 100-(1-RN-p)% of the C1 -patterns have been classified as C1 -regions. The remai~ ing micro-regions are then all classified as C 2 -regions. sified the least number of C 2 -patterns are misclassified. When the Neyman-Pearson method is used and R N-P is specified, the percentage of correctly classified C2 - patterns would constitute a reasonable index of performance.
The selection of the attributes is probably the single most important step in the PR design; a witty description of the search for good attributes and some of the pitfalls has been given by Selfridge (Selfridge 1962). 3 An Effective Set of Attributes. The problem in receptor design is to find an effective set of NH or fewer attributes, where NH is the largest number of attributes which the designer can afford to use in the later hardware (or software) implementation; p in Figure 1 is the number of attributes that is actually used, p is usually equal to NH • In rare cases when fewer than NH attributes give adequate performance, pis les s than NH • The material in this subsection is divided as follows.
E. , (i) suitable filtering may be used to enhance the signal to nois e ratio for waveforms and images (Pattern Recognition, vol. 2, n02, May 1970 contains 7paperson Image Enhancement, vol. 2, n °1, January contains 5 papers on two-dimensional Picture Processing), (ii) handwritten alpha-numerical characters may be normalized with respect to size and orientation (Casey 1970), (iii) irregularities that clearly are due to noise maybe removed from the unlabelled pattern by "smoothing" so that edges become clearer (Unger 1959; Levine 1969; Golay 1969; Deutsch 1970) and (iv) the dynamic range for speech signals may be reduced (Hell warth and Jones 1965).
An Introduction to the Design of Pattern Recognition Devices by P.W. Becker