Quad-Tree Motion Estimation in the Frequency Domain Using Gradient Correlation

Argyriou, Vasileios; Vlachos, T.

doi:10.1109/tmm.2007.898926

Cited by 20 publications

(13 citation statements)

References 27 publications

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“…The systematic error associated with the co-registration was kept to <1 pixel, so with a pixel size, P s , of 15 m and time separation, �t, of 1 year, the systematic error for the velocity, � �syst , becomes P s =�t or �15 m a À 1 (Berthier and others, 2003). The random error associated with the feature-tracking algorithm is <1 pixel, with accuracy ranging from 1/8 to 1/4 pixel ( Argyriou and Vlachos, 2007). Taking a conservative estimate of the random error to be �0.5 pixels, which corresponds to a �8 m a À 1 error, the total error associated with the procedure used is � ¼ ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffiffi…”

Section: Error Analysismentioning

confidence: 99%

Linking surface hydrology to flow regimes and patterns of velocity variability on Devon Ice Cap, Nunavut

Wyatt

Sharp

2015

J. Glaciol.

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ABSTRACT. Supraglacial meltwater reaching a glacier bed can increase ice surface velocities via hydraulic jacking and enhanced basal sliding. However, the relationships between the structure of supraglacial drainage systems, sink-point distributions, glacier flow processes and the magnitude of interannual velocity variability are poorly understood. To explore the hypothesis that spatial variations in the rate and mechanisms of glacier flow are linked to variations in supraglacial drainage system structure and sink-point distribution across an ice cap, we mapped supraglacial drainage systems on Devon Ice Cap from Landsat-7 ETM+ imagery. Spatial patterns of surface velocity and interannual velocity variability were determined using gradient correlation applied to Landsat-7 ETM+ images. Velocity variability is greater in areas close to sink-point locations, presumably because hydrologically forced basal sliding and/or bed deformation are enhanced in such areas. The distribution and characteristics of supraglacial drainage systems may play an important role in determining the distribution of regions of basal sliding, highlighting the need for knowledge of the supraglacial drainage system structure and sink-point distribution to inform efforts to model the dynamic response of Arctic ice caps to future climate warming.

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Section: Error Analysismentioning

confidence: 99%

Linking surface hydrology to flow regimes and patterns of velocity variability on Devon Ice Cap, Nunavut

Wyatt

Sharp

2015

J. Glaciol.

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“…In order to evaluate the realism of a crowd or pedestrian simulation algorithm, vision‐based features are utilized. Motion estimation and tracking are a few of the vision‐based steps applied during the process of pedestrian and crowd behavior analysis for visual surveillance in dynamic scenes …”

Section: Literature Reviewmentioning

confidence: 99%

A human and group behavior simulation evaluation framework utilizing composition and video analysis

Dupre

Argyriou

2018

Computer Animation & Virtual

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In this work, we present the modular crowd simulation evaluation through composition framework, which provides a quantitative comparison between different pedestrian and crowd simulation approaches. Evaluation is made based on the comparison of source footage against synthetic video created through novel composition techniques. The proposed framework seeks to reduce the complexity of simulation evaluation and provide a platform from which the comparison of differing simulation algorithms and parametric tuning can be conducted to improve simulation accuracy or provide measures of similarity between crowd simulation algorithms and source data. Through the use of features designed to mimic the human visual system, specific simulation properties can be evaluated relative to sample footage. Validation was performed on a number of popular crowd data sets and through comparisons of multiple pedestrian and crowd simulation algorithms.

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“…Argyriou and Vlachos [1] in their work, proposed the use of gradient correlation in the frequency domain. Edrem et al [6] estimated the motion parameters using a harmonic retrieval approach.…”

Section: Literature Reviewmentioning

confidence: 99%

High Performance Block Matching Algorithm for High Bit-Rate Real-Time Video Communication

Al-Najdawi¹

2018

JJCIT

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Quad-Tree Motion Estimation in the Frequency Domain Using Gradient Correlation

Cited by 20 publications

References 27 publications

Linking surface hydrology to flow regimes and patterns of velocity variability on Devon Ice Cap, Nunavut

Linking surface hydrology to flow regimes and patterns of velocity variability on Devon Ice Cap, Nunavut

A human and group behavior simulation evaluation framework utilizing composition and video analysis

High Performance Block Matching Algorithm for High Bit-Rate Real-Time Video Communication

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