关键词: 可逆数据隐藏, 分段差值扩展, 位平面替换, 溢出定位图, 预测误差差值扩展

Abstract: Concerning the drawbacks of relatively large location map and the quality decline of stego-images from excessive modulation to pixels of Tian's algorithm, a reversible data hiding algorithm for color images based on piecewise difference expansion was proposed. This algorithm used correlation of color components to decrease difference and disperse smaller expansion to two components, and used piecewise difference expansion and bit plane replacing to embed data information, and the quantity of un-expandable difference was decreased. Changeability of difference was used to locate unchangeable difference, so the payload capacity could be increased. The experimental results show that the payload capacity and the quality of stego-image are significantly improved, compared with other new or classical algorithms.

Key words: reversible data hiding, piecewise difference expansion, bit plane replacing, overflow location map, Prediction Error Difference Expansion (PEDE)