Translator Disclaimer
12 November 2001 Alpha coding of arbitrarily shaped objects for low-bit-rate MPEG-4
Author Affiliations +
Proceedings Volume 4518, Multimedia Systems and Applications IV; (2001)
Event: ITCom 2001: International Symposium on the Convergence of IT and Communications, 2001, Denver, CO, United States
This paper presents a new scheme for compact shape-coding which can reduce the needed bandwidth for low bit rate MPEG- 4 applications. Our scheme is based on a coarse representation of the alpha plane with a block size resolution of 8x8 pixels. This arrangement saves bandwidth and reduces the algorithm complexity (number of computations), as compared to the Content-based Arithmetic Encoding (CAE) algorithm. In our algorithm, we encode the alpha plane of a macroblock with only 4 bits, while we can further reduce the number of encoding bits by using the Huffman code. The encoding blocks are only contour macroblocks, transparent macroblocks are considered as background macroblocks, while opaque macroblocks are considered as object macroblocks. We show that the amount of bandwidth saving with representing the alpha-plane can reach a factor of 9.5. Such a scheme is appropriate for mobile applications where there is a lack of both bandwidth and processing power. We also speculate that our scheme will be compatible to the MPEG-4 standard.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ofer Hadar and Hagai Folkman "Alpha coding of arbitrarily shaped objects for low-bit-rate MPEG-4", Proc. SPIE 4518, Multimedia Systems and Applications IV, (12 November 2001);


Subjective evaluation of HEVC in mobile devices
Proceedings of SPIE (March 07 2013)
QBIX-G: a transcoding multimedia proxy
Proceedings of SPIE (January 16 2006)
JPEG 2000 file format an imaging architecture for today...
Proceedings of SPIE (December 28 2000)
Breaking the news on mobile TV user requirements of...
Proceedings of SPIE (February 10 2006)

Back to Top