摘要
The traditional correlation-based detector is optimal only for Gaussian data, but the Laplacian Probability Density Function (PDF) is more appropriate to model the coefficients in the Discrete Ridgelet Transform (DRT) domain. An additive maximum-likelihood detector based on the Laplacian PDF is analyzed and the theoretical result of its performance is given. The experiments show that the error of the Laplacian model for the DRT coefficients of many images is smaller than that of the Gaussian model. The experiments also prove that the Laplacian detector is superior to the tradi- tional correlation-based detector.
The traditional correlation-based detector is optimal only for Gaussian data, but the Laplacian Probability Density Function （PDF） is more appropriate to model the coefficients in the Discrete Ridgelet Transform （DRT） domain. An additive maximum-likelihood detector based on the Laplacian PDF is analyzed and the theoretical result of its performance is given. The experiments show that the error of the Laplacian model for the DRT coefficients of many images is smaller than that of the Gaussian model. The experiments also prove that the Laplacian detector is superior to the traditional correlation-based detector.
基金
Supported by the National Natural Science Foundation of China (No.10371055).
关键词
语音
信号处理技术
设计方案
通信技术
Ridgelet transform
Digital watermarking
Laplacian model
Statistical detection
