A Novel Proposal for Improvement of a Foreground Robustness and Extracting Accuracy on an Artificial Fiber Pattern by Utilizing a Relative Intensity Ratio and Foreground Covering

DOI Web Site

Bibliographic Information

Other Title
  • 前景部の穴埋めと相対強度比を用いた難視性パターンの前景耐性及び抽出率の改善
  • ゼンケイブ ノ アナウメ ト ソウタイ キョウドヒ オ モチイタ ナンシセイ パターン ノ ゼンケイ タイセイ オヨビ チュウシュツリツ ノ カイゼン

Search this article

Abstract

We have previously proposed the artificial fiber (AF) patterns in order to be able to hide information in printed documents. AF pattern uses the features of the medium (e.g., paper). It has some special characteristics of low visibility of the hidden information, print-scan robustness, device independent property and geometrical/rotational invariance. On the other hand it also has a weakness regarding foreground robustness and extraction threshold instability when using a camera as an input device. In the past several challenges we have proved foreground robustness only in case of adding AF pattern on foreground objects. It has been difficult to extract information in case of adding a foreground object on AF pattern by a distortion of its low frequency part. Also we found extraction threshold instability was caused by an uneven illuminance when using a camera. In this paper we proposed using the calculated intensity ratio of adjacent AF patterns for improving an uneven illuminance at camera usage then covering foreground objects with the AF pattern by detecting a contour of foreground objects for improving foreground robustness. We proved these proposals are very effective for improving weaknesses of the AF pattern by several experiments.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top