The improvement in hardware capabilities of mobile devices has led to the active use of processor-heavy contents, such as multimedia files, on resource-limited platforms. In addition to simply enjoying such contents on mobile devices, recently commercialized protocols allow the real-time sharing of multimedia (or a mobile device's screen contents) with neighboring devices via wireless connection. However, unlike PC-scale computing platforms, use-case expansions on mobile devices face an additional technical challenge. Specifically, while the improved computation power is capable of handling processor-hungry applications, battery limitations hold back their full utilization. This paper acknowledges the fact that screen sharing on mobile devices can be attractive, but empirically show that minimizing the energy consumption is crutial, and introduces enhancements to the widely used H.264 encoder on mobile devices. Specifically, our enhancements target to minimize the transmission size of multimedia contents by analyzing the screen's dynamics. For contents with high dynamics, our scheme tries to maintain the video quality, while aggressively skipping frames for regions with minimal motion intensity. Our empirical evaluations show that the proposed light-weight enhancements reduce the size of a typical multimedia file by ∼42%, while maintaining a high user-perceived quality (e.g., Structural SIMilarity measure) of 0.925. Wirelessly sharing this video results in ∼31% lower frame transmission rate and up to ∼21% power savings in less dynamic regions.
Bibliographical noteFunding Information:
Manuscript received October 22, 2015; revised March 1, 2016 and May 9, 2016; accepted July 2, 2016. Date of publication July 26, 2016; date of current version May 2, 2018. This work was supported in part by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2015R1D1A1A01059049), and by the “Location-based Tactical MANET Communication and Control S/W for Unmanned Ground Systems” project of the Agency for Defense Development (ADD), South Korea. (Corresponding author: Young-Bae Ko.) K.-W. Lim is with the Sorbonne Universités, UPMC Univ Paris 06, CNRS, LIP6 UMR 7606, Paris F-75005, France (e-mail: Keun-Woo.Lim@phare. lip6.fr; ).
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All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Information Systems
- Computer Science Applications
- Computer Networks and Communications
- Electrical and Electronic Engineering