An Improved Method of Digital Watermarking Applied to Binary Printed Images

이진 프린트 영상에 적용하는 디지털 워터마킹의 성능 개선

  • 김현주 (충북대학교 정보통신공학과) ;
  • 곽내정 (충북대학교 정보통신공학과) ;
  • 권혁봉 (김포대학 전자정보 계열 정보통신전공) ;
  • 안재형 (충북대학교 전지 전자 및 컴퓨터 공학부)
  • Published : 2001.06.01


Digital watermarking is a copyright protection technique for digital images which embed a code into the digital data so the data is marked. Watermarking techniques previously deal with on-line digital data and have been developed to withstand digital attacks such image processing, compression and geometric transformation. In this paper we propose a novel method of embedding watermarks in printed images. In the proposed algorithm, watermark is embedded in a dithered binary image by comparing the $2\times{2}$ blocks of the counting array is the number of 1 (WHITE) in the $16\times{16}$ blocks of the dithered binary image with predefined reference block pattern, which is generated by watermark values. The proposed algorithm is able to provide more information at a watermark because the proposed algorithm use both '1'and '0' as watermark values. The watermark information is detected by comparing the watermark which is reconstructed from the image which is embedded watermark with the original watermark which is embedded in a binary image. The performance of the proposed algorithm is compared with that of the conventional watermark embedding algorithm for printed images by detecting watermark for scan images.