Abstract
The use of shore-based video systems has become a very popular and accessible low-cost tool for coastal monitoring given their capability to deliver continuous and high-resolution temporal data over large enough spatial scales. However, the reliability of the final image products can be compromised by external factors, sometimes overlooked, that can alter the image geometry over time. In particular, unwanted camera movement, produced either by thermal or mechanical effects, can lead to significant geo-rectification errors if not properly corrected. This study addresses an alternative straightforward method to stabilize an either continuous or subsampled image sequence based on state-of-the-art techniques and available routines.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/xX1CrvPQpK8
Highlights
The use of shore-based video systems has become a very popular and accessible low-cost tool for coastal monitoring given their capability to deliver continuous and high-resolution temporal data over large enough spatial scales
Image stabilization is a fundamental post-processing step that should always be performed in general coastal imaging applications to increase the accuracy of video-derived products, such as shoreline/sandbar position and depths estimate
The stabilization method was applied to 5 years daily images collected from a three-camera permanent video system located at Anglet Beach (SW France), 70 m above mean sea level
Summary
The use of shore-based video systems has become a very popular and accessible low-cost tool for coastal monitoring given their capability to deliver continuous and high-resolution temporal data over large enough spatial scales. Pixels in azimuth, 30 pixels in tilt and 0.4° in roll, together with a quasi-steady counter-clockwise trend over the 5 year time series period. Camera viewing angle deviations were found to induce large rectification errors up to 400 m at a distance of 2.5 km from the camera.
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