Allograph (handwriting)

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Figure 1. Examples of allographs for the letter t and the letter k
Figure 1. Examples of allographs for the letter t and the letter k
Figure 2. Samples of the word optimum, written by different persons. Regardless of trivial size and slant differences, it is the use of different allographs which characterizes a writer's hand.
Figure 2. Samples of the word optimum, written by different persons. Regardless of trivial size and slant differences, it is the use of different allographs which characterizes a writer's hand.

In graphonomics and handwriting recognition, the concept of allograph is concerned with the fact that in handwriting, one particular letter from an alphabet can be realized using a number of shapes. The most evident occurrence of an allograph is in the upper-case and lower-case shape for one letter (cf., a vs A).

Within a writing system, individual writers use their personalized and characteristic shape for a letter, as in Figure 1. This poses many problems in optical character recognition. As an example, Figure 2 shows many ways in which writers may give shape to the word optimum in the Latin alphabet.

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