JPEG图像的可逆信息隐藏技术已被广泛利用，为了提高JPEG图像在可逆信息隐藏过程中的嵌入容量和嵌入效率，文中提出了一种基于频率选择扩容的可逆信息隐藏技术。首先对原始图像进行量化，生成若干个离散余弦变换（DCT）块，将DCT块根据块内是否含有±3和±4值的交流系数值分成两种类型，以选择不同的嵌入位置进行嵌入，并根据频率选择策略计算块内各位置的嵌入失真，按照嵌入失真排序后的频率选择嵌入位置并嵌入秘密信息。实验结果表明，文中的算法扩大了嵌入容量且减小了文件增加量。

Reversible data hiding technology for JPEG images has been widely used.In order to improve the embedding capacity and embedding efficiency of JPEG images in the reversible data hiding process, this paper proposed a reversible data hiding technology based on frequency selective expansion.Firstly, the original image was quantized to generate several DCT blocks, then the DCT blocks were divided into two types to select different embedding positions for embedding based on whether the block contains ±3 and ±4 AC coefficient values.Finally, the embedding distortion of each position in the block were calculated according to the frequency selection strategy.The embedding position was selected and the secret data was embedded according to the ordered frequency of embedded distortion.The experimental results show that the proposed algorithm expands the embedding capacity and reduces the file increase.