AN IMPROVEMENT OF A SINGLE-DOT METHOD FOR AN INFORMATION-HIDING METHOD BY APPLYING AN ERROR-CORRECTING CODE

In this study, we focus on a technique th at embeds an electronically readable watermark directly on printed material. This technique is used in the single-dot method proposed by Kaneda et al. We improve upon this single-dot method proposed by Kaneda. In the existing method, the paper used was required to be card-sized, and the extraction rate was 97.68%. In this paper, we increase the paper size to A4 and raise the extraction rate to 98.72%. We also experiment on paper-based documents with a foreground and succeed in embedding information and extracting it without error by using error-correcting codes with less redundancy.