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Fig. 14.4. Handwritten digit examples. One hundred samples from
the NIST database 3 are shown demonstrating the variety of inputs in
this task. Most of the digits are recognizable to a human observer;
however, each digit occurs in different shapes, thicknesses and
orientations, there is significant overlap between digits, and the
classification is based on small, crucial differences. Such properties
make automatic classification of handwritten digits very difficult.
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