基于DCT（离散余弦变换）域的信息隐藏算法是目前应用最广的变换域算法，此类算法的最大不足是嵌入信息量小。通过分析DCT域隐藏算法隐藏容量少的原因，提出了一种大容量的DCT域信息隐藏算法。算法首先对载体图像进行频谱均匀化处理，然后对图像进行全局DCT变换，并将隐藏信息嵌入到载体图像的低频DCT系数上，信息嵌入采用分段量化的方法实现，提取隐藏信息时不需要原始载体图像。实验结果表明，该算法的嵌入容量大，不可感知性好。

So far information hiding algorithm based on DCT domain is the most extensive one in all transformation domain algorithm applications Its most serious disadvantage is the low capacity for information hiding The reason why only small capacity information can be hidden in DCT domain of an image is analyzed, and a high capacity blind information hiding algorithm based on DCT domain is proposed In our algorithm, the uniform spectrum processing is first applied to the original image Then, a global DCT transformation of the image is finished Finally, the information, which is to be hidden, is embedded into the low frequency coefficients in DCT domain Moreover, the information hiding is implemented by using segment quantification method, extracting the hidden information without using the original image Experiment shows that our algorithm has a high capacity of information hiding and good imperceptibility