A STUDY ON PICTURE QUALITY IMPROVEMENT TE CHNIQUE FOR VIDEO CODEC

Citation
H. Okada et al., A STUDY ON PICTURE QUALITY IMPROVEMENT TE CHNIQUE FOR VIDEO CODEC, Sharp giho, (60), 1994, pp. 25-30
Citations number
NO
Categorie Soggetti
Instument & Instrumentation","Engineering, Eletrical & Electronic","Computer Science Hardware & Architecture
Journal title
ISSN journal
02850362
Issue
60
Year of publication
1994
Pages
25 - 30
Database
ISI
SICI code
0285-0362(1994):60<25:ASOPQI>2.0.ZU;2-5
Abstract
This paper proposes a technique which can improve subjective picture q uality for Video codec. On this approach, we focus on the importance o f facial pictures in videophone and videoconferencing applications. Th is algorithm is roughly divided into encoding and decoding processes. For the encoding process, we classify the picture into the facial regi on and background region. A low-pass filter is then adopted to elimina te the high frequency components in the background region. The facial region is preferentially allocated the number of bits by coding contro l. For the decoding process, post-filtering for the reduction of mosqu ito noise and blocking effect is applied to the reproduced picture. Si mulations of 2 videophone sequences have been carried out. The MOS for the reproduced pictures using the proposed technique increases about 40.0 - 63.9 %. From the results, the effectiveness of the proposed tec hnique for video coding has been definitely proved.