Backgrounds as information carriers for printed documents

摘要

This paper presents a method of embedding and recovery of a largeamount of data on printed documents. The proposed method ischaracterized by the following points: (1) As the medium for recordingthe data, backgrounds (white space) of pages are utilized. Since whitespace is dominant in ordinary pages, this enables us to record a largeamount of data. (2) As the representation of data, an arbitrary figure(such as a logo mark of a company) is stippled to obtain a set ofpoints, each of which is superimposed on a page image. This allows us toprevent the appearance of a page from deteriorating, since stippledfigures play a role of background patterns on printed documents. Theexperimental results show that the method is capable of both recording7.8KB of data and reading the embedded data with the accuracy of 99%