In-camera IMU angular data for orthophoto projection in underwater photogrammetry

In-camera IMU angular data for orthophoto projection in underwater photogrammetry

Blog Article

Among photogrammetric products, orthophotos are probably Enhanced Perception for Autonomous Vehicles at Obstructed Intersections: An Implementation of Vehicle to Infrastructure (V2I) Collaboration the most versatile and widely used in many fields of application.In the last years, coupled with the spread of semi-automated survey and processing approaches based on photogrammetry, orthophotos have become almost a standard for monitoring the underwater environment.If on land the definition of the reference coordinate system and projection plane for the orthophoto generation is trivial, underwater it may represent a challenge.

In this paper, we address the issue of defining the vertical direction and resulting horizontal plane (levelling) for the differential ortho rectification.We propose a non-invasive, contactless method based on roll and pitch angular data provided by in-camera IMU sensors and embedded in the Exif metadata of JPEG and raw image files.We show how our approach can be seamlessly integrated into automatic SfM/MVS pipelines, provide the mathematical background, and showcase real-world applications results in an underwater monitoring project.

The results illustrate the effectiveness of the proposed method and, for the first time, provide a metric evaluation of the definition of the vertical direction with low-cost sensors enclosed Efek Ketergantungan Remaja K-Popers Terhadap Media Sosial di Kota Palu in digital cameras directly underwater.