Two-Step Approach toward Alignment of Spatiotemporal Wide-Area Unmanned Aerial Vehicle Imageries

Author:

Lee Hyeonseok1ORCID,Kim Semo23,Lim Dohun1,Bae Seoung-Hun4,Kang Lae-Hyong235ORCID,Kim Sungchan16

Affiliation:

1. Department of Computer Science and Artificial Intelligence, Jeonbuk National University, Jeonju 54896, Republic of Korea

2. Department of Mechatronics Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea

3. LANL-JBNU Engineering Institute-Korea, Jeonbuk National University, Jeonju 54896, Republic of Korea

4. Spatial Information Research Institute, Korea Land and Geospatial Informatix Corporation, Jeonju 54870, Republic of Korea

5. Department of Flexible and Printable Electronics, Jeonbuk National University, Jeonju 54896, Republic of Korea

6. Center for Advanced Image Information Technology, Jeonbuk National University, Jeonju 54896, Republic of Korea

Abstract

Recently, analysis and decision-making based on spatiotemporal unmanned aerial vehicle (UAV) high-resolution imagery are gaining significant attention in smart agriculture. Constructing a spatiotemporal dataset requires multiple UAV image mosaics taken at different times. Because the weather or a UAV flight trajectory is subject to change when the images are taken, the mosaics are typically unaligned. This paper proposes a two-step approach, composed of global and local alignments, for spatiotemporal alignment of two wide-area UAV mosaics of high resolution. The first step, global alignment, finds a projection matrix that initially maps keypoints in the source mosaic onto matched counterparts in the target mosaic. The next step, local alignment, refines the result of the global alignment. The proposed method splits input mosaics into patches and applies individual transformations to each patch to enhance the remaining local misalignments at patch level. Such independent local alignments may result in new artifacts at patch boundaries. The proposed method uses a simple yet effective technique to suppress those artifacts without harming the benefit of the local alignment. Extensive experiments validate the proposed method by using several datasets for highland fields and plains in South Korea. Compared with a recent work, the proposed method improves the accuracy of alignment by up to 13.21% over the datasets.

Funder

Spatial Information Research Institute, Korea Land and Geospatial Informatix Corporation

Publisher

MDPI AG

Subject

Artificial Intelligence,Computer Science Applications,Aerospace Engineering,Information Systems,Control and Systems Engineering

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