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http://dx.doi.org/10.7780/kjrs.2018.34.6.1.6

Extraction of UAV Image Sharpness Index Using Edge Target Analysis  

Lim, Pyung-Chae (Department of GeoInfomatic Engineering, Inha University)
Seo, Junghoon (Department of GeoInfomatic Engineering, Inha University)
Kim, Taejung (Department of GeoInfomatic Engineering, Inha University)
Publication Information
Korean Journal of Remote Sensing / v.34, no.6_1, 2018 , pp. 905-923 More about this Journal
Abstract
In order to generate high-resolution products using UAV images, it is necessary to analyze the sharpness of the themselves measured through image analysis. When images that have unclear sharpness of UAV are used in the production, they can have a great influence on operations such as acquisition and mapping of accurate three-dimensional information using UAV. GRD (Ground Resolved Distance) has been used as an indicator of image clarity. GRD is defined as the minimum distance between two identifiable objects in an image and is used as a concept against the GSD (Ground Sampling Distance), which is a spatial sample interval. In this study, GRD is extracted by analyzing the edge target without visual analysis. In particular, GRD to GSD ratio (GRD/GSD), or GRD expressed in pixels, is used as an index for evaluation the relative image sharpness. In this paper, GRD is calculated by analyzing edge targets at various altitudes in various shooting environments using a rotary wing. Using GRD/GSD, it was possible to identify images whose sharpness was significantly lowered, and the appropriateness of the image as an image clarity index was confirmed.
Keywords
image quality Analysis; UAV; Ground Resolved Distance; Edge Analysis; Sharpness of Image;
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Times Cited By KSCI : 2  (Citation Analysis)
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