一种基于梯度分块的直方图平移可逆信息隐藏

针对大多数基于直方图平移的可逆信息隐藏中载体图像分块方法过于粗糙的问题，根据相邻像素之间具有相似特性，提出对载体图像按像素梯度进行分割，将图像分为平滑区域和粗糙区域。同时为减少像素的无效平移，只对平滑区域分块并采用直方图的次峰值点进行双向移位实现信息可逆隐藏，同时将零值点嵌入图像；不需要单独传送峰值点和零值点信息，降低了通信负担。实验表明，该方法在图像质量和峰值信噪比上具有明显的提升，可应用于保密传输等领域。

Histogram translation reversible information hiding based on gradient block

Aiming at most of the carrier image block methods in reversible information hiding based on histogram shifting are too rough. According to the similarity between adjacent pixels, a method of dividing the carrier image into smooth and rough areas by pixel gradient is proposed. At the same time, in order to reduce the invalid shift of pixels, we only divide the smooth region into blocks, and use the sub-peak points of the histogram for bidirectional shift to achieve reversible information hiding, while embedding the zero points into the image. These improvements make our method does not need to transmit peak points and zero points information separately, reducing the communication burden. The experimental results show that the method can improve image quality and Peak signal-to-noise ratio, which can be applied to secure transmission and other fields.