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Browsing by Author "Van den Bergh, Frans"

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Deferred slanted-edge analysis: A unified approach to Spatial Frequency Response measurement on distorted images and Colour Filter Array subsets

Author: Van den Bergh, Frans Date: Mar 2018 The slanted-edge method of spatial frequency response (SFR) measurement is usually applied to grayscale images under the assumption that any distortion of the expected straight edge is negligible. By decoupling the edge orientation and position ... Read more
Land Cover Change Detection Using Autocorrelation Analysis on MODIS Time-Series Data: Detection of New Human Settlements in the Gauteng Province of South Africa

Author: Kleynhans, Waldo ; Salmon, Brian P ; Olivier, JC ; Van den Bergh, Frans ; Wessels, Konrad J ; Grobler, Trienko L ; Steenkamp, Karen C Date: 2012 Autocorrelation Change detection MODIS Timeseries Read more
Land cover change detection using the internal covariance matrix of the extended kalman filter over multiple spectral bands

Author: Salmon, Brian P ; Kleynhans, Waldo ; Van den Bergh, Frans ; Olivier, JC ; Grobler, TL ; Wessels, Konrad J Date: Jun 2013 In this paper, the internal operations of an Extended Kalman Filter is investigated to observe if information can be derived to detect land cover change in a MODerate-resolution Imaging Spectroradiometer (MODIS) time series. The concept is ... Read more
Modified temporal approach to meta-optimizing an extended Kalman filter's parameters

Author: Salmon, BP ; Kleynhans, Waldo ; Olivier, JC ; Olding, WC ; Wessels, Konrad J ; Van den Bergh, Frans Date: Jul 2014 It has been shown that time series containing reflectance values from the first two spectral bands of the MODerateresolution Imaging Spectroradiometer (MODIS) land surface reflectance product can be modelled as a triply modulated cosine ... Read more
A modified temporal criterion to meta-optimize the extended Kalman filter for land cover classification of remotely sensed time series

Author: Salmon, BP ; Kleynhans, Waldo ; Olivier, JC ; Van den Bergh, Frans ; Wessels, Konrad J Date: May 2018 Humans are transforming land cover at an ever-increasing rate. Accurate geographical maps on land cover, especially rural and urban settlements are essential to planning sustainable development. Time series extracted from MODerate resolution ... Read more
Multi-threaded compression of Earth observation time-series data

Author: Swanepoel, Derick ; Van den Bergh, Frans Date: Mar 2017 Earth observation data are typically compressed using general-purpose single-threaded compression algorithms that operate at a fraction of the bandwidth of modern storage and processing systems. We present evidence that recently developed ... Read more
Robust edge spread function construction methods to counter poor sample spacing uniformity in the slanted-edge method

Author: Van den Bergh, Frans Date: Jun 2019 The slanted-edge method describes an algorithm for measuring the spatial frequency response (SFR) of digital imaging systems. The method can be applied to edges oriented at nearly any angle, but there are some angles that cause simplistic ... Read more

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Browsing by Author "Van den Bergh, Frans"

Browsing by Author "Van den Bergh, Frans"

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