Based on 2D-PEH, there are actually various histogram modification strategies. The idea of pairwise PEE [19] is to expand or shift bins in a less distorted direction as much as possible. Its modification rule is presented in the left figure of Fig. 3. For conventional PEE with T = 1 as illustrated in the left figure of Fig. 2, the pair (0,0) is expanded to (0,0), (0,1), (1,0) and (1,1) to embed 2 bits. However, for pairwise PEE, to reduce the embedding distortion, the directions with high distortion, e.g., mapping (0,0) to (1,1) is discarded, and the pair (0,0) is only expanded to three pairs (0,0), (0,1) and (1,0) to embed log3 bits. In addition, by pairwise PEE, the pair (1,1) is expanded to (1,1) and (2,2) to embed 1 bit, while it is only shifted to (2,2) in conventional PEE. Clearly, the idea of pairwise PEE can be directly applied to the adaptive PEE embedding shown in the right figure of Fig. 2. That is to say, mapping (2,2) to (3,3) can be discarded as well, and (2,2) will be expanded to three pairs (2,2), (2,3) and (3,2) to embed log3 bits. The corresponding mapping is presented in the right figure of Fig. 3.
基於2D-PEH,其實有不同的直方圖作案科幻陽離子策略。成對PEE [19]的思想是在失真程度較小的方向盡可能地擴大或移位二進制位。其MODI音響陽離子規則被呈現在圖2的左音響古爾。3.對於T =常規PEE 1如在圖的左側連接古爾2所示,一對(0,0)被擴展為(0,0),(0 ,1),(1,0)和(1,1)中嵌入2比特。然而,對於成對PEE,以減少失真嵌入,具有較高的失真,例如,映射(0,0)到(1,1)的方向上被丟棄,並且該一對(0,0)僅擴展到三對( 0,0),(0,1)和(1,0),以嵌入log3中位。另外,通過成對PEE,一對(1,1)被擴展為(1,1)和(2,2)中嵌入1比特,而它是在常規PEE僅偏移到(2,2)。顯然,成對PEE的思想可以直接應用到自適應PEE在圖1的右連接古爾所示嵌入。2.也就是說,映射(2,2)到(3,3)可以被丟棄,以及,(2 ,2)將被擴展到三個對(2,2),(2,3)和(3,2)中嵌入log3中位。相應的映射被呈現在圖3中的右音響古爾。
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基於2D-PEH,實際上有各種長條圖修改策略。成對撒尿的想法是盡可能地在不扭曲的方向上擴大或移動垃圾箱。其修改規則如圖3左圖所示。如圖2的左圖所示,對於T=1的傳統PEE,將對(0,0)擴展到(0,0),(0,1),(1,0)和(1,1),以嵌入2比特。然而,對於成對PEE,為了减少嵌入失真,丟棄具有高失真的方向,例如映射(0,0)到(1,1),並且僅將對(0,0)擴展到三對(0,0),(0,1)和(1,0)以嵌入log3比特。此外,通過成對PEE,將pair(1,1)擴展到(1,1)和(2,2)嵌入1比特,而在傳統PEE中僅移位到(2,2)。顯然,成對PEE的思想可以直接應用於圖2的右圖所示的自我調整PEE嵌入。也就是說,映射(2,2)到(3,3)也可以丟棄,並且(2,2)將擴展到三對(2,2),(2,3)和(3,2)以嵌入log3比特。相應的映射如圖3的右圖所示。<br>
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