User-Friendly Image Sharing With Adjustable Shadow Image

• Main Authors: Yin-Fang Chien, 簡吟芳
• Other Authors: 王任瓚
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/10820820611048479611

碩士 === 元智大學 === 資訊工程學系 === 98 === Image sharing addresses a fault-tolerant protection mechanism for important images. In a typical image sharing scheme, the generated shadow images usually have a noise-like appearance that conceals the secret image completely, but this makes them difficult to identify and manage. This paper proposes an adjustable user-friendly image sharing scheme in which each generated shadow image looks like a shrunken replica of the original image. It provides an easy-to-identify interface for managing the shadow images. In the proposed scheme, the original image is divided into an obvious component and a secret component. The obvious component contains the data that can be directly observed in the shadow images, and it determines the quality of the generated shadow images. The secret component is processed using the (t, n) threshold mechanism to conceal the details of the original image. Compare with previous user-friendly image sharing schemes, the proposed method can reconstruct the original image without any loss and still has the small-size shadow images. Notably, the qualities the generated shadow images are adjustable in the proposed scheme. It provides high flexibility for designing user-friendly image sharing scheme with satisfactory quality of shadow images in different applications.