High Capacity Reversible Data Hiding On Ordered Dithered Halftone Images

• Main Authors: Lee, KunYing, 李昆穎
• Other Authors: Lien, KuoJen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/24221237995321032555

碩士 === 輔仁大學 === 資訊工程學系 === 100 === In this paper, in terms of lossless data compress and pixel paring, we propose a high capacity reversible data hiding method of ordered dithered halftone image. Ordered dithering method can simply convert a gray scale image into a halftone image by com-paring pixel values with dither matrix values. Moreover, we divide a halftone image into three types of pixel-pairs through pixel pairing method. We use two types of pixel-pairs as our objects of lossless compression and main sources of capacity. We use the Golomb code to losslessly compress these two types of pixel-pairs information, then embed the result into image to achieve reversibly. Compared to other reversible watermarking methods, our new method provides a higher embedding capacity and still maintains a better visual quality of watermarked image. The experiment result show that our methods do have a higher embedding ca-pacity and better visual quality.