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Low cost multimedia sensor networks for obtaining lighting maps

机译：用于获取照明图的低成本多媒体传感器网络

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摘要

In many applications, video streams, images, audio streams and scalar data are commonly used. In these fields, one of the most important magnitudes to be collected and controlled is the light intensity in different spots. So, it is extremely important to be able to deploy a network of light sensors which are usually integrated in a more general Wireless Multimedia Sensor Network (WMSN). Light control systems have increasing applications in many places like streets, roads, buildings, theaters, etc. In these situations having a dense grid of sensing spots significantly enhances measuring precision and control performance. When a great number of measuring spots are required, the cost of the sensor becomes a very important concern. In this paper the use of very low cost light sensors is proposed and it is shown how to overcome its limited performance by directionally correcting its results. A correction factor is derived for several lighting conditions. The proposed method is firstly applied to measure light in a single spot. Additionally a prototype of a sensor network is employed to draw the lighting map of a surface. Finally the sensor grid is employed to estimate the position and power of a set of light sources in a certain region of interest (street, building, …). These three applications have shown that using low cost sensors instead of luxmeters is a feasible approach to estimate illuminance levels in a room and to derive light sources maps. The obtained error measuring spots illuminance or estimating lamp emittances are quite acceptable in many practical applications.
机译：在许多应用中，通常使用视频流，图像，音频流和标量数据。在这些领域中，要收集和控制的最重要的量级之一是不同点的光强度。因此，能够部署通常集成在更通用的无线多媒体传感器网络（WMSN）中的光传感器网络非常重要。光控制系统在诸如街道，道路，建筑物，剧院等许多地方的应用越来越多。在这些情况下，具有密集的感测点网格可以显着提高测量精度和控制性能。当需要大量测量点时，传感器的成本成为非常重要的问题。在本文中，提出了使用成本非常低的光传感器的方法，并说明了如何通过定向校正其结果来克服其有限的性能。针对几种照明条件得出校正因子。所提出的方法首先应用于测量单点光。另外，采用传感器网络的原型来绘制表面的照明图。最后，使用传感器网格来估计一组光源在特定感兴趣区域（街道，建筑物等）中的位置和功率。这三个应用表明，使用低成本传感器代替照度计是一种估算房间照度水平并得出光源图的可行方法。在许多实际应用中，获得的误差测量点照度或估计灯的发射率是完全可以接受的。

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