Establishing multiplexed watermarking method using spread code and development of its decoding algorithm

我们的目标是提出最优的数字水印解码算法。由于很难得到贝叶斯最优解，我们需要设计解码算法。研究了减少水印间干扰的方法和攻击引起的噪声的特性，提出了各种算法并对其进行了评价。结果表明，异步更新优于同步更新，随机估计优于确定性估计。

Our goal is to propose optimal decoding algorithms for digital watermarking. Since it is hard to obtain Bayes optimal solutions, we need to devise decoding algorithms. We studied both methods reducing interference between the watermarks and property of noises caused by attacks, and then, we proposed various algorithms and evaluated them. As a result, we found asynchronous update is better than synchronous one, and stochastic estimation is better than deterministic one.