Feature-Based OCR
PART III - Character Features
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Basic Features
Naive Feature Tabulation
| Character | End-points | Tri-intersection | Quad-intersection |
| A | 2 | 2 | 0 |
| B | 0 | 2 | 0 |
| C | 2 | 0 | 0 |
| D* | 0 | 0 | 0 |
| E | 3 | 1 | 0 |
| F | 3 | 1 | 0 |
| G | 3 | 1 | 0 |
| H | 4 | 2 | 0 |
(note: *identical to O's feature list)
Regional Feature Encoding
Top Orientation
II I III IV Bottom Orientation
II I III IV Left Orientation
II I III IV Right Orientation
II I III IV
Regional Feature Table
| Character | Top Orientation
|
Bottom Orientation
|
Left Orientation
|
Right Orientation
|
||||||||||||
| A | 0, X, 0 | 2, X, 0 | 1, 1, 0 | 1, 1, 0 | ||||||||||||
| B | 0, X, 0 | 0, X, 0 | 0, 1, 0 | 0, 1, 0 | ||||||||||||
| C | 1, 0, 0 | 1, 0, 0 | 0, 0, 0 | 2, 0, 0 | ||||||||||||
(note: X marks wildcard features)
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Next: Skeletonization