VOP memory management in MPEG-4

Karthikeyan Vaithianathan; Sethuraman Panchanathan

doi:10.1117/12.420794

29 March 2001 VOP memory management in MPEG-4

Karthikeyan Vaithianathan, Sethuraman Panchanathan

Proceedings Volume 4313, Media Processors 2001; (2001) https://doi.org/10.1117/12.420794
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

MPEG-4 is a multimedia standard that requires Video Object Planes (VOPs). Generation of VOPs for any kind of video sequence is still a challenging problem that largely remains unsolved. Nevertheless, if this problem is treated by imposing certain constraints, solutions for specific application domains can be found. MPEG-4 applications in mobile devices is one such domain where the opposite goals namely low power and high throughput are required to be met. Efficient memory management plays a major role in reducing the power consumption. Specifically, efficient memory management for VOPs is difficult because the lifetimes of these objects vary and these life times may be overlapping. Varying life times of the objects requires dynamic memory management where memory fragmentation is a key problem that needs to be addressed. In general, memory management systems address this problem by following a combination of strategy, policy and mechanism. For MPEG4 based mobile devices that lack instruction processors, a hardware based memory management solution is necessary. In MPEG4 based mobile devices that have a RISC processor, using a Real time operating system (RTOS) for this memory management task is not expected to be efficient because the strategies and policies used by the ROTS is often tuned for handling memory segments of smaller sizes compared to object sizes. Hence, a memory management scheme specifically tuned for VOPs is important. In this paper, different strategies, policies and mechanisms for memory management are considered and an efficient combination is proposed for the case of VOP memory management along with a hardware architecture, which can handle the proposed combination.

Citation Download Citation

Karthikeyan Vaithianathan and Sethuraman Panchanathan "VOP memory management in MPEG-4", Proc. SPIE 4313, Media Processors 2001, (29 March 2001); https://doi.org/10.1117/12.420794

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KEYWORDS

Video

Operating systems

Mobile devices

Digital watermarking

Multimedia

Raster graphics

Signal processing

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