Reversible data hiding using Histogram shifting on IDWT

• Main Authors: Wu,Yo-Lin, 吳侑霖
• Other Authors: Chen, Po-Yueh
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/44p452

碩士 === 國立彰化師範大學 === 資訊工程學系 === 105 === As the internet keeping developing, copyright protection of the digital contents has become more and more important. As a good solution to prevent malicious steals and attacks, digital watermarking has become very popular in recent years. Digital watermarking can be applied to data hiding. In some case, we need to recover the cover image after extracting the data from the image which is watermarked. Reversible watermarking has been developed for recovering the cover image after extracting the watermark from the cover image. In this paper, we investigated about the improvement of images using reversible watermarking. In previous work, reversible watermarking can embed less amount of watermark, so we proposed an improved reversible watermarking method. The grayscale cover images are transformed by integer discrete wavelet transform (IDWT) and the resulting frequency coefficients are selected for watermark embedding.