利用嵌入式小波零树对小波变换系数进行编码生成参考数据，采用喷泉码对参考数据进一步编码，并将编码数据与认证数据嵌入到原始图像中. 在接收端，通过提取认证数据确定图像中的篡改位置，再从未被篡改区域提取参考数据，经喷泉码解码后重构被篡改区域的内容. 与基于分块离散余弦变换的参考数据生成方法相比，所提出的方法克服了恢复图像中的块效应. 该方法可实现动态的数据嵌入与图像恢复，通过参数选择可实现恢复面积与恢复质量的平衡.
We first utilize EZW to encode the wavelet coefficients of the image, and then the fountain encoding to generate the reference data. By extracting forensic data and reference data which is self-embedded into the image, tampered area is detected and reference data is also reconstructed. Comparing to block-based DCT,we overcome the blocking artifact of the recovered image. Besides this, we propose a method which makes the data embedding and image quality dynamic by adjusting the parameters. A balance between the recovered area and recovered quality is also achievable.
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