中文摘要：

指纹图像水印是数字内容保护的重要应用领域，而鲁棒性是其实现的关键技术。针对指纹数字内容的水印化保护问题，提出一种分块压缩感知水印（Block compressed sensing watermark，BCSW）变采样率实现方法。首先对指纹图像进行DWT变换，并对每级每个子带分别进行分块压缩感知测量处理，并将观测值作为水印信息嵌入到载体图像。实验结果表明，相对于联合DWT-DCT和DCT以及SCD水印算法，BCSW算法具有更好的鲁棒性，同时具有更高的准确性和安全性。

英文摘要：

Content protection of fingerprint image is an important application field for information securi- ty, and robustness is a key techniques. An actualization method of block compressed sensing watermark- ing （BCSW） with variable sampling rates is proposed to aim at content security protection problem. First- ly, the watermark image of fingerprint is performed discrete wavelet transform （DWT） , and divided into several sub block in which the block size can be adjusted according to structure features of the blocking image. Secondly, block-based compressed-sensing sampling is deployed independently within each sub- band of each decomposition level of a wavelet transform of an image. Finally, the formed watermark data are embedded into all sub-blocks of the LLn sub-band of the transformed host image by using quantization technique. Experimental results show that the introduction of compressed sensing theory improves the ro- bustness and security of the protected fingerprint image.