Title :
On the distribution of the DCT coefficients
Author :
Eude, T. ; Grisel, R. ; Cherifi, Hocine ; Debrie, R.
Author_Institution :
Inst. Nat. des Sci. Appliquees, Mont Saint Aignan, France
Abstract :
The paper presents a statistical study in order to improve the image compression rate in discrete cosine transform (DCT) based methods and especially for compression methods which are defined in JPEG norm. It is realised extensively, using a battery of parametric and non-parametric fit-tests and laws such as those of Cauchy, Laplace, Gauss, and a mixture distribution of Laplace and Gaussian. Considering the absence of results for these laws in the literature, the authors constructed adapted statistical tools for DCT coefficients analysis. Then, they show that these coefficients can be modelized by a Gaussian finite mixture distribution. They also comment on the obtained results for medical images applications and explain how the compression rate can be improve with them
Keywords :
Gaussian processes; data compression; discrete cosine transforms; image coding; medical image processing; statistical analysis; Cauchy law; DCT coefficients; Gauss law; Gaussian finite mixture distribution; JPEG norm; Laplace law; coefficients analysis; discrete cosine transform; image compression rate; medical images applications; nonparametric fit-tests; parametric fit-tests; statistical study; Batteries; Biomedical imaging; Discrete cosine transforms; Gaussian distribution; Image coding; Pixel; Quantization; Testing; Transform coding; Wavelet transforms;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-1775-0
DOI :
10.1109/ICASSP.1994.389412
