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Pen Digits Dataset
Figure A.4:
Pen digits dataset PENDIG. 1500 (of 7494) samples of the
handwritten numerals 09 are plotted in gray
arranged by their classes. Their mean is shown superimposed with bold black.

Figure A.5:
PENDIG clusters. 1500 (of 7494) samples of the handwritten
numerals 09 are illustrated arranged by clusters. Strong intraclass variation as e.g., seen in the numeral 5
is disambiguated into several clusters: 5 can be written like a 'S' in one stroke from top to bottom or in two strokes with the top dash last.

Alexander Strehl
20020503