NDLI: Optical flow based DC surface compensation for artifacts reduction

Content Provider	IEEE Xplore Digital Library
Author	Xin Jin Goto, S. King Ngi Ngan
Copyright Year	2009
Description	Author affiliation: Dept. of Electronic Engineering, The Chinese Univ. of Hong Kong, Shatin, N.T., Hong Kong (King Ngi Ngan) \|\| Graduate School of Information, Production and Systems, Waseda University, Fukuoka, Japan (Goto, S.) \|\| Information Technology Research Organization, Waseda University, Fukuoka, Japan (Xin Jin)
Abstract	The block-based prediction, transform and quantization reduce the redundancy in video data efficiently. However, the blocking artifacts are introduced because of quantization error and prediction scheme. Even if the de-blocking filter is applied like that designed in H.264 and AVS, the blocking artifacts are still visible especially in videos with smooth area coded at low bit-rate. In this paper, an optical flow based technique is proposed to further reduce the blocking artifacts by compensating the DC surfaces of the decoded images using joint optimization of optical flow and edge difference. The proposed algorithm automatically classifies the macroblocks in the decoded images according to their texture feature and endures the smooth area with smooth brightness variation by minimizing the joint function of optical flow magnitude and edge smoothness. It produces a more pleasing image without over-filtering, which can be further applied as an in loop filter for video coding.
Starting Page	1
Ending Page	4
File Size	405297
Page Count	4
File Format	PDF
ISBN	9781424445936
DOI	10.1109/PCS.2009.5167414
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-05-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical filters Video coding optical flow optimization Brightness Quantization Decoding DC surface compensation Image motion analysis Image coding Video compression artifacts reduction edge smoothness control Discrete cosine transforms Pixel
Content Type	Text
Resource Type	Article

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