Open AccessMotion Compensated Subband Video Coding with Arbitrarily Shaped Region Adaptivity
Author(s) -
Kwon OhJin,
Choi Seokrim
Publication year - 2001
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.01.0101.0405
Subject(s) - computer vision , artificial intelligence , motion compensation , quarter pixel motion , block matching algorithm , computer science , motion estimation , discrete cosine transform , coding (social sciences) , zoom , motion field , match moving , multiview video coding , mathematics , video tracking , video processing , motion (physics) , image (mathematics) , optics , statistics , lens (geology) , physics
The performance of Motion Compensated Discrete Cosine Transform (MC‐DCT) video coding is improved by using the region adaptive subband image coding [18]. On the assumption that the video is acquired from the camera on a moving platform and the distance between the camera and the scene is large enough, both the motion of camera and the motion of moving objects in a frame are compensated. For the compensation of camera motion, a feature matching algorithm is employed. Several feature points extracted using a Sobel operator are used to compensate the camera motion of translation, rotation, and zoom. The illumination change between frames is also compensated. Motion compensated frame differences are divided into three regions called stationary background, moving objects, and newly emerging areas each of which is arbitrarily shaped. Different quantizers are used for different regions. Compared to the conventional MC‐DCT video coding using block matching algorithm, our video coding scheme shows about 1.0‐dB improvements on average for the experimental video samples.