Word Recognition Using Fuzzy Logic 作者： R. Buse, Z. Liu, and J. Bezdek 報告人：余家豪

The offline recognition of handwritten cursive word Segment the word into its character parts. Word-based.

Word-based approach ’ s challenges The complexity more greater. Have lower discrimination capabilities. It is usually restricted to few word groups.

How to extract word feature ? First step: Slant and Tilt Correction Second step: Using Gabor filter Third step: Word Alignment

Two-dimensional (2-D) fuzzy membership function Use to represent both sizes and positions of the extracted word feature.

First step: Slant and Tilt Correction Silver Vegas

Second step: Using Gabor filter The extracted feature image Angle of Gabor filter Ø=90°

Third step: Word Alignment(1) K-means clustering algorithm ( Centroids ) The horizontal and vertical Alignment points Formula

Third step: Word Alignment(2) Using alignment points to transform the extracted feature images into a standard data structure of aligned image features.

How to form fuzzy membership function ? First step: Composite aligned images Second step: Determine threshold points Third step: Corner point Correspondences Fourth step: Membership Value

First step: Composite aligned images Baton (a) (f)(e)(d) (c)(b) (g) - R ij

Second step: Determine threshold points C u = 0.25 C l = 0.1 H uij : upper threshold point H lij : lower threshold point Rij Found boundary

Third step: Corner point Correspondences C: set of valid combination pairs (i,j) (24 possible combinations) T: top rectangle point B: bottom rectangle point || · || distance between the two corners The side of the Membership function

Fourth step: Membership Value 2-D membership function μ(x,y): memebership value at point (x,y)

Matching test words to the membership function ( at Ø=90° )