DESIGN GUIDELINES FOR CHARACTER REJECTION AND SUBSTITUTION FOR OFF-LINE DOCUMENT PROCESSING SYSTEMS

Most optical character recognition systems are not error-free. Thus, s ome characters are rejected or substituted when an off-line document i s processed. Alternatives of a rejected character can be provided to h elp a human user to select the correct one while proofreading the proc essed document. This study investigated several ways of presenting alt ernatives for rejected characters and the user strategy of proofreadin g documents with rejected and substituted characters. Design factors e xamined included rejection and substitution rates, number of alternati ves, and the availability of the original document for proofreading. P roofreading speed and accuracy were measured. The results were analyze d statistically and analytically to come up with human factors design guidelines. Detailed design strategies and recommendations were sugges ted based upon the results.