Journal of University of Chinese Academy of Sciences >
Distributions of audio DCT coefficients
Received date: 2010-09-08
Revised date: 2010-11-15
Online published: 2011-11-15
Considering the non-gaussian property of discrete cosine transform(DCT) coefficients of audio and the limitation of modeling the DCT coefficient distribution with a single distribution such as generalized gaussian distribution(GGD) or alpha stable distribution, we propose a mixed model. This mixed model is a linearly weighted average of GGD and alpha stable distribution, while the weight values are obtained using a genetic algorithm. The model accuracy is measured with the Kullback-Leibler Divergence, a metric for evaluating the difference between two probability distributions. Experiment results show that the mixed model is close to the true distribution of DCT coefficients and is of practical use in the field of audio retrieval and steganalysis.
WANG Cui-Ping , GUO Li , WANG Yu-Jie , CHEN Yun-Bi . Distributions of audio DCT coefficients[J]. Journal of University of Chinese Academy of Sciences, 2011 , 28(6) : 752 -758 . DOI: 10.7523/j.issn.2095-6134.2011.6.008
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