High Payload Reversible Data Hiding with Reduplicated Exploiting Modification Direction using Image Interpolation and Edge Detection

• Main Authors: Kai-Chin Chen, 陳凱琴
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/41301068664160691854

碩士 === 朝陽科技大學 === 資訊管理系碩士班 === 100 === For the past decade, data hiding for digital images is the science that involves communicating secret data in a cover image to form the stego-image and has the goal to conceal the very existence of the embedded content. Irreversible and reversible data hiding schemes are two common applications. The irreversible schemes hold high embedding capacity, but they can not restore the stego-images to its original contents after secret data have been extracted. Therefore, reversible data hiding techniques are more useful in the real world because stego-images can be exactly restored back to the original images. The only problem to be faced is to enhance the embedding capacity.This thesis designs a reversible data hiding scheme utilizing reduplicated exploiting modification direction (REMD) and edge detection to meet the requirements of embedding capacity, visual quality of stego-image and security. In addition, the thesis also adopts image interpolation technology to achieve the purpose of data restoration. An image may consist of complex and smooth textures. Human eyes are quite sensitive to the changes in the smooth areas; that is, some modification on smooth area for embedding secret data might bring attention to interceptors. Therefore, it will be more effective to take full advantage of the edge to hide the information so Canny edge detection is employed to identify edge pixels for hiding more data within. The experimental results show that this scheme of the average payload can achieve from 1.87bpp with good image quality (about 45dB) to the embedding capacity of 3.01bpp with acceptable image quality of 33±1dB.