基于直方图平移的图像二次分块可逆数据隐藏方法

Reversible Data Hiding by Dividing Images into Blocks Twice Based on Histogram Shifting

由Ni提出的对像素进行直方图平移进行可逆数据隐藏,一方面在单峰值或双峰值的情况下嵌入容量不够高,另一方面在嵌入数据之后对于图像的保真度也不够好。在此,基于直方图平移的方式,提出一种改进算法,将图像进行二次划分,增加像素峰值点,提升图片的峰值信噪比。实验结果表明,该算法不仅可以实现可逆数据隐藏,而且与Ni算法相比,既提升了嵌入容量,也使隐藏后的图像失真更小。

The histogram shifting for reversible data hiding is put forward by the Ni. On one hand, embedding ca-pacity of a single or double peak is not high; on the other hand, the fidelity of the image after embedded data is not good enough. Therefore, based on the histogram of translation mode, this paper puts forward an improved algorithm that di-vides the image twice, increases the pixel peak point and improves the peak signal to noise ratio of pictures. Compared with the algorithm put forward by Ni, the experimental results show that the algorithm not only can realize the reversi-ble data hiding, but also can promote the embedding capacity and make image distortion smaller after the hidden.