[Download] ~ MỘT LƯỢC ĐỒ THỦY VÂN THUẬN NGHỊCH ~ by Sang Pham ~ Book PDF Kindle ePub Free
eBook details
- Title: MỘT LƯỢC ĐỒ THỦY VÂN THUẬN NGHỊCH
- Author : Sang Pham
- Release Date : January 26, 2021
- Genre: System Administration,Books,Computers & Internet,
- Pages : * pages
- Size : 518 KB
Description
Difference expansion (DE) is an important technique for designing reversible watermarking schemes. In this paper we propose a new reversible watermarking algorithm by using the idea of DE for vectors of image pixel values. For each vector, an element is selected as a basic element and differences are generated by subtracting the basic element from other elements. Each small difference can be used for embedding a bit by using the DE technique. In our new scheme, the position of a basic element is adjusted adaptively on each vector so that the differences have small absolute values. As a consequence, the embedding capacity and the watermarked image quality of the scheme are improved. Experimental results show that the proposed scheme has higher embedding capacity and better image quality in comparison with many existing reversible watermarking methods.
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