SYSTEM AND METHOD FOR DECODING AN OPTICALLY READABLE MARKABLE SHEET AND MARKABLE SHEET THEREFOR

摘要

An optically readable markable sheet has selection mark spaces and has voiding mark spaces associated with the selection mark spaces. An apparatus and a method for reading the optically readable sheet may comprise a processor decoding a sheet identifier and the mark spaces from an image of the sheet and determining the mark spaces that are marked. Marking a voiding mark space voids a selection marked in the selection mark space with which the voiding mark space is associated. Sheet images and a record of marked mark spaces are stored in a memory, preferably a non-volatile memory. Sheet images may be provided by an optical imager that images the sheet and/or by an optical mark reader that reads the sheet.