Various Techniques for Assessment of OMR Sheets through Ordinary 2D Scanner: A Survey

Optical Mark Recognition (OMR) is the process of gathering information from human beings by recognizing marks on a document. OMR is accomplished by using a hardware device (scanner) that detects a reflection or limited light transmittance through piece of paper. The OMR machines are not scanners in the sense that they do not form an image of the sheets that pass through. Instead, the OMR device simply detects whether predefined areas are blank or have been marked. OMR scans a printed form and reads predefined positions and records where marks are made on the form. OMR is useful for applications in which large numbers of hand-filled forms need to be processed quickly and with great accuracy, such as surveys, reply cards, questionnaires. OMR allows for the processing of hundreds or thousands of physical documents per hour. The existing system requires special hardware which turns out to be very costly for any organization. So using such a system may be cost inefficient or not feasible by organizations it is the need of the hour to develop system which would be cost effective and time effective in other words cheap and best. The error rate for OMR technology is less than 1%. Keywords— OMR, Scanner, Reognition, Image processing