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2982 IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 59, NO. 11, NOVEMBER 2010 Detecting External Disturbances on the Camera Lens
 

Summary: 2982 IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 59, NO. 11, NOVEMBER 2010
Detecting External Disturbances on the Camera Lens
in Wireless Multimedia Sensor Networks
Cesare Alippi, Fellow, IEEE, Giacomo Boracchi, Romolo Camplani, and Manuel Roveri
Abstract--Assessing the quality of images acquired by nodes
of a wireless multimedia sensor network (WMSN) is a critical
issue, particularly in outdoor applications where external distur-
bances such as the presence of water, dust, snow, or tampering
on the camera lens may seriously corrupt the acquired images.
In this paper, we address the problem of determining when the
lens of a microcamera mounted on a WMSN node is affected
by an external disturbance that produces blurred or obfuscated
images. We show that such a problem can be solved by considering
change detection tests applied to a measure of the blur intensity.
Interestingly, both measuring the blur and the change detection
test do not require any assumption about the content of the
observed scene, its nature, or the characteristics of the blur. The
proposed methodology is thus flexible and effective for a large
class of monitoring applications. In particular, it is attractive when
nodes cannot continuously acquire images (e.g., because of energy

  

Source: Alippi, Cesare - Dipartimento di Elettronica e Informazione, Politecnico di Milano

 

Collections: Computer Technologies and Information Sciences