Title :
Statistical model of quantized DCT coefficients
Author :
Zou, Fuliao ; Lu, Zhengding ; Hefei Ling
Author_Institution :
Sch. of Comput. Sci. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
In this paper we propose a two-parameter probability model of quantized DCT coefficients for image and video (i.e. JPEG&MPEG format materials), which is based on empirical observation of their statistics in the quantized DCT coefficient domain. The parameters are evaluated in terms of the maximum likelihood criterion which is applied to different frequency coefficients space. The experimental results show that quantized DCT coefficients´ distribution modeled by generalized Laplacian performs better than by Laplacian.
Keywords :
Laplace transforms; data compression; discrete cosine transforms; maximum likelihood estimation; probability; quantisation (signal); video coding; digital watermarking; discrete cosine transform; generalized Laplacian distribution; image; maximum likelihood criterion; probability density function; quantized DCT coefficient; video; Discrete cosine transforms; Discrete wavelet transforms; Frequency; Image coding; Laplace equations; Maximum likelihood estimation; Probability density function; Steganography; Video compression; Watermarking;
Conference_Titel :
Signal Processing, 2004. Proceedings. ICSP '04. 2004 7th International Conference on
Print_ISBN :
0-7803-8406-7
DOI :
10.1109/ICOSP.2004.1442307
