Title :
An improved H.263 video coder relying on weighted median filtering of motion vectors
Author :
Alparone, Luciano ; Barni, Mauro ; Bartolini, Franco ; Santurri, Leonardo
Author_Institution :
Dept. of Electron. & Telecommun., Florence Univ., Italy
fDate :
2/1/2001 12:00:00 AM
Abstract :
The impact of a regularization of motion vectors (MVs) on the performance of a block-DCT based video coder (H.263) is addressed. Postprocessing is accomplished by exploiting both the spatial correlation of the vector field and the confidence of the estimated block vectors. A previously proposed adaptive scheme for MV smoothing, based on the theory of vector median filters, is adjusted and embedded into an H.263 coder. With a bit stream that is perfectly H.263-compatible, results are improved, especially for very low bit rates and complex motion of the scene
Keywords :
adaptive filters; adaptive signal processing; code standards; data compression; discrete cosine transforms; median filters; motion estimation; telecommunication standards; transform coding; video coding; H.263 video coder; H.263-compatible bit stream; adaptive motion vector smoothing; block-DCT based video coder; estimated block vectors; motion vector regularization; postprocessing; spatial correlation; vector field; vector median filters; weighted median filtering; Adaptive filters; Bit rate; Councils; Design for disassembly; Filtering theory; Layout; Motion estimation; Smoothing methods; Streaming media; Video coding;
Journal_Title :
Circuits and Systems for Video Technology, IEEE Transactions on
