Title :
Distributions of the DCT coefficient for Watermark Detection
Author :
Du, Yao Gang ; Ying, Chen ; Feng, Wang L. ; Zheng, Yuan
Author_Institution :
Beijing Electron. Sci. & Technol. Inst., Beijing, China
Abstract :
In this paper, we derive the distribution of the DCT coefficients for a fixed block variance, and invoke the central limit theorem to show that this is approximately Gaussian. Then, by allowing the block variance to have a statistical distribution itself, we analyze when the DCT coefficients would follow a Laplacian distribution. Such knowledge would be useful, for instance, in quantizer design, information hiding capacity and Watermark Detection.
Keywords :
data encapsulation; discrete cosine transforms; quantisation (signal); signal detection; statistical distributions; watermarking; DCT coefficient; Laplacian distribution; central limit theorem; fixed block variance; information hiding capacity; quantizer design; statistical distribution; watermark detection; Discrete cosine transforms; Gaussian distribution; Laplace equations; Probability density function; Random variables; Watermarking; DCT coefficient; Laplacian distribution; information hiding capacity;
Conference_Titel :
Computer Application and System Modeling (ICCASM), 2010 International Conference on
Conference_Location :
Taiyuan
Print_ISBN :
978-1-4244-7235-2
Electronic_ISBN :
978-1-4244-7237-6
DOI :
10.1109/ICCASM.2010.5622674
