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An Adaptive Technique to Detect and Remove Shadow from Drone Data

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Abstract

Unmanned aerial vehicles (UAVs)/drones are used to capture and monitor real-time data for various applications. Different sensors may be mounted on the UAV like 4K RGB camera, RedEdge-M and many others. 4K camera is used to capture an image in RGB bands, and RedEdge-M captures an image in five bands namely Blue, Green, Red, RedEdge and Near Infrared having a center wavelength of 475, 560, 668, 717 and 840 nm, respectively. Quality of an image can be judged with its basic two properties, i.e., spatial and spectral information. The images obtained by these sensors are useful for monitoring various targets. One of the most important challenges for any UAV sensor image is a shadow that affects a lot the quality of an image. A shadow can hinder the identification of the target and also affect the vegetation parameters which highly depend on the band values. Huge change in the class labels has been identified during classification because of shadow. Band values can highly suffer from shadow, and thus, it is required to minimize the shadow effect without compromising the image quality. Therefore, in this paper, an attempt has been made to minimize the shadow effect by proposing an algorithm that is based on spatial distribution of neighboring pixels and is compared with other known techniques. The study area chosen is an agriculture field nearby Roorkee region, which lies in the northern part of India having central latitude–longitude as 29.9457°N, 78.1642°E. The images were captured using DJI Phantom 3 pro at an altitude of 100 m which provides a spatial of 0.05 m. It is observed that the proposed method shows better results as compared to others.

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Acknowledgement

Authors would like to thank RailTel Corporation of India Ltd. Delhi and Space Application Centre, Ahmedabad, for supporting this work.

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Correspondence to Dharmendra Singh.

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Agarwal, A., Kumar, S. & Singh, D. An Adaptive Technique to Detect and Remove Shadow from Drone Data. J Indian Soc Remote Sens 49, 491–498 (2021). https://doi.org/10.1007/s12524-020-01227-z

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  • DOI: https://doi.org/10.1007/s12524-020-01227-z

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