Time and spatial ϵ-filter for improving image quality of compressed video

Author

Hisamitsu, Hideaki ; Arakawa, Koaru

Author_Institution

Dept. of Comput. Sci., Meiji Univ., Kawasaki, Japan

Volume

1

fYear

2004

fDate

25-28 July 2004

Abstract

Time and spatial ε-filter is proposed in order to improve the image quality of video compressed by DCT motion compensated coding. The ε-filter is a nonlinear digital filter proposed by authors before in order to remove small-amplitude random noise such as block noise and mosquito noise caused by DCT coding on images. Authors also proposed before motion compensated ε-filter which can efficiently remove such noise from video coded by motion compensated coding. In this paper, the extension of this motion compensated ε-filter to time domain is proposed, that is time and spatial ε-filter. It is shown that the noise is more powerfully removed from video than the previous method, while the complexity of the system is kept low. Moreover, the performance of this filter is shown to be improved by adaptive control of the parameter of the ε-filter.

Keywords

adaptive control; adaptive filters; digital filters; discrete cosine transforms; image denoising; motion compensation; nonlinear filters; random noise; spatial filters; video coding; DCT motion compensated coding; adaptive control; block noise; image quality; mosquito noise; motion compensated ϵ-filter; nonlinear digital filter; random noise; spatial ϵ-filter; time ϵ-filter; time domain analysis; Adaptive control; Digital filters; Discrete cosine transforms; Image coding; Image quality; Low pass filters; Noise level; Noise reduction; Nonlinear filters; Video compression;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. MWSCAS '04. The 2004 47th Midwest Symposium on

Print_ISBN

0-7803-8346-X

Type

conf

DOI

10.1109/MWSCAS.2004.1353984

Filename

1353984