A Comparison Between Block-Based and Non Block-Based Watermarking Schemes based on DWT
In recent years, invisible digital watermarks have been proposed as a method for protecting copyrighted materials such as digital images. Due to its characteristics, one of the problems in digital image watermarking is to decide which technique should be used to hide in an image as many bits of information as possible while ensuring that the embedded watermark can be correctly extracted at the detecting stage, even after various attacks. In this paper we study the effect of dividing the image into blocks and applying a watermarking scheme to each block as an individual image (block-based), and compare it with applying the same watermark to the entire image (non-block-based). Digital wavelet transform (DWT) combined with a proper quantization method is used in this paper and normalized correlation (NC) is used to compare between the two cases after applying number of standard attacks. The results show that block-based watermarking has slightly better performance than non-block-based watermarking.
component Watermarking DWT Block-based quantization
Osamah M.Al-Qershi Khoo Bee Ee
School of Electrical and Electronic Engineering University Sains Malaysia Penang, Malaysia
国际会议
Second International Symposium on Electronic Commerce and Security(第二届电子商务与安全国际研究大会)(ISECS 2009)
南昌
英文
169-173
2009-05-22（万方平台首次上网日期，不代表论文的发表时间）