Evaluation of Geometric Modeling for KOMPSAT-1 EOC Imagery Using Ephemeris Data

Sohn, Hong Gyoo; Yoo, Hwan Hee; Kim, Seong Sam

doi:10.4218/etrij.04.0103.0085

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…3(a)). This has been adopted in SPOT and Kompsat‐1 (Sohn et al., 2004). A drawback of this form of stereoscopic coverage is the large time gap between scenes constituting the stereopair.…”

Section: Linear Array Scanners: Stereo Coverage Scenariosmentioning

confidence: 99%

Analysis of Epipolar Geometry in Linear Array Scanner Scenes

Habib

Morgan

Jeong

et al. 2005

The Photogrammetric Record

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Resampled imagery according to epipolar geometry, usually denoted as normalised imagery, is characterised by having conjugate points along the same row (or column). Such a characteristic makes normalised imagery an important prerequisite for many photogrammetric activities such as image matching, automatic aerial triangulation, automatic digital elevation model and orthophoto generation, and stereo viewing. The normalisation process requires having the input imagery in a digital format, which can be obtained by scanning analogue photographs or by direct use of digital cameras. To reduce the time gap between the data acquisition and product delivery, many small‐scale mapping projects now rely on digital cameras. Digital frame cameras still, in general, provide imagery with geometric resolution and ground coverage inferior to scanned images from analogue cameras. Linear array scanners (line cameras) have therefore emerged as a possible alternative to digital frame cameras, especially for high‐resolution space‐borne imaging, with performance comparable to that of analogue frame cameras. The normalisation process of frame images is a well‐established and straight forward procedure. On the other hand, the normalisation process of linear array scanner scenes is not as straightforward and is sometimes mysterious. For example, providers of space‐borne imagery furnish normalised line scanner imagery while the user community is not aware of the underlying process. This paper presents a comprehensive analysis of the epipolar geometry in linear array scanner scenes. Special emphasis is directed towards scanners moving with constant velocity and attitude since such a trajectory closely resembles the imaging geometry of the majority of current space‐borne scanners. The research presented highlights the factors affecting the shape of the resulting epipolar lines such as the stereo coverage configuration and the geometric specifications of the imaging system. In addition, the paper outlines a comparative analysis of the normalisation process for frame and line cameras. The presented concepts are verified through experimental results with synthetic data.

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Section: Linear Array Scanners: Stereo Coverage Scenariosmentioning

confidence: 99%

Analysis of Epipolar Geometry in Linear Array Scanner Scenes

Habib

Morgan

Jeong

et al. 2005

The Photogrammetric Record

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Epipolar Geometry of Line Cameras Moving with Constant Velocity and Attitude

Habib¹,

Morgan²,

Jeong³

et al. 2005

ETRI J

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Image resampling according to epipolar geometry is an important prerequisite for a variety of photogrammetric tasks. Established procedures for resampling frame images according to epipolar geometry are not suitable for scenes captured by line cameras. In this paper, the mathematical model describing epipolar lines in scenes captured by line cameras moving with constant velocity and attitude is established and analyzed. The choice of this trajectory is motivated by the fact that many line cameras can be assumed to follow such a flight path during the short duration of a scene capture (especially when considering space‐borne imaging platforms). Experimental results from synthetic along‐track and across‐track stereo‐scenes are presented. For these scenes, the deviations of the resulting epipolar lines from straightness, as the camera's angular field of view decreases, are quantified and presented.

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Evaluation of Geometric Modeling for KOMPSAT-1 EOC Imagery Using Ephemeris Data

Cited by 2 publications

References 3 publications

Analysis of Epipolar Geometry in Linear Array Scanner Scenes

Analysis of Epipolar Geometry in Linear Array Scanner Scenes

Epipolar Geometry of Line Cameras Moving with Constant Velocity and Attitude

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