Energy-Aware Surveillance Camera

Abstract

In this chapter, we introduce an application example of a wireless surveillance camera (WSC) consisting of image sensor, event detector, video encoder, flash memory, wireless transmitter, and battery. The battery- and flash-constrained WSC records images when significant events, such as suspicious pedestrians or vehicles, are detected, based on a hierarchical event detection method to avoid wasting energy on insignificant events. In an energy-aware sense, the recorded images are stored in non-volatile (flash) memory or transmitted to the base station according to the urgency of the event. Balancing the usage of all resources including battery and flash is critical in prolonging the lifetime of a WSC, because a shortage of either battery charge or flash capacity could lead to a complete loss of events, or a significant loss of quality in the recorded image of events. We assume that the resources of the WSC, i.e., the battery and flash, are refreshed every system maintenance period (SMP). The proposed method controls the bit rate of encoded videos and sampling rate, e.g., resolution and frame rate, to prolong the lifetime of the WSC until the next SMP. Experimental results show that the proposed method prolongs the lifetime of the WSC by up to 88.41% compared with an existing bit-rate allocation method that does not consider resource usage balancing.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Samsung ElectronicsSeoulRepublic of Korea
  2. 2.KAISTDaejeonRepublic of Korea

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