Delayed stroke

See: graphonomics

The difference between on-line handwriting recognition and off-line handwriting recognition (i.e., optical character recognition is that temporal information is present in the on-line pen-tip trajectory Xt,Yt. During writing, the human writer sometimes delays the formation of a character element, e.g. the dot on a letter i or j, or the horizontal bar of the handprint allograph of the lower-case letter t to a later moment in time such as finishing a word, sentence or paragraph. Whereas the optical result may appear impeccable, an on-line handwriting recognition system must process the temporal post-hoc editing event and attribute it to the correct character in the production sequence. This illustrate that having additional, temporal information is not only helpful in the handwriting recognition process but adds its own source of noise.