Details of Grant 

EPSRC Reference:	GR/K42776/01
Title:	LOW BITRATE VIDEO CODING BASED ON GENERAL MOTION MODEL AND OBJECT SEGMENTATION
Principal Investigator:	Kittler, Professor J
Other Investigators:	Bober, Professor M
Researcher Co-Investigators:
Project Partners:
Department:	Sch of Electronics & Physical Sciences
Organisation:	University of Surrey
Scheme:	Standard Research (Pre-FEC)
Starts:	01 April 1995	Ends:	30 September 1998	Value (£):	148,131
EPSRC Research Topic Classifications:	Digital Signal Processing
EPSRC Industrial Sector Classifications:
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Summary on Grant Application Form
We have recently demonstrated substantial improvements both in bit rates and PSNR of coded video sequences by adopting a piecewise motion boundary approximation in conjunction with a local translatory motion mode. The aim of this research is to pursue this promising approach further by exploring two main directions:1)By adopting a general motion model it should be possible to minimise the umber of independently moving regions and therefore the amount of motion model information to be transmitted per pixel.2) Motion boundaries should be represented by more concise curve models rather than in terms of piecewise approximation There are a number of unsolved problems that have to be addressed to realise this approach. Firstly, existing techniques for parallel segmentation and estimation of complex motion will have to be developed to gain efficiency. Moreover, the method must cope with multiple complex motions, giving unbiased estimate, and provide reliable segmentation. Also, uncovered regions have to be explicitly labelled, as they need special treatment. Robustness to noise and illumination changes is another requirement that has to be satisfied. Secondly, an efficient technique for coding motion boundaries will be required. Moreover, one could expect a correlation in the boundaries shape in consecutive frames which, if exploited, could facilitate even a further bit-rate reduction. Also, the coding of uncovered background remains an open question. Probably, some standard techniques could be adapted here, with modifications to cope with regions of arbitrary shape. Alternatively, uncovered regions could be covered by variable-size rectangular blocks, and the grey-level surface of the block coded by one of the standard methods. The subjective quality of block based coding of the uncovered regions will have to be investigated.
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