| Summary: | 碩士 === 國立臺灣科技大學 === 資訊工程系 === 99 === Different from the conventional data hiding techniques, the reversible data hiding technique can recover the original image without any distortion after extracting the hidden data. In this thesis, a new quality-efficient block-based reversible data hiding algorithm is presented. In the proposed algorithm, we divide an image into a set of blocks with a specific size. Then, the edge direction of the target block can be estimated by its neighboring blocks. According the estimated edge direction, we can embed the hidden data by the difference expansion scheme. By experimenting on some typical test images, the results demonstrate that under the same embedding capacity, the proposed data hiding algorithm has better marked image quality than the previously published block-based reversible data hiding algorithm.
|
|---|
