传统的数字指纹编码方案由于其自身存在性问题和相关检测的复杂性，使其指纹的生成效率和跟踪效率很低。针对上述问题，提出了一种新的基于频分复用的数字指纹编码方案。该方案以频谱不相互重叠的余弦信号的抽样作为数字指纹，通过扩频序列将指纹嵌入到原始图像的中频系数中。同时结合嵌入算法分析了其抗合谋性能，并从理论上推导出码字长度与用户人数之间的关系。仿真实验表明了该方案的可行性和有效性。

Due to the existence problem and complexity on correlative detection, traditional digital fingerprinting schemes have low efficiency in construction and tracking. To solve this problem, a new fingerprinting scheme based on the FDM(frequency division multiplexing) technique is proposed in this paper. In this scheme, the digital fingerprinting, which is a random sample from Cosine signal with no spectral overlap, is embedded in the middle-frequency coefficients of the original image through the spreading sequences. The performance of anti-collusion by embedding algorithm is also analyzed so as to theoretically deduce the relationship between code length and user size. The experimental results demonstrate the feasibility and efficiency of the scheme.