1,722,775 research outputs found
On classification of acceleration and its components in computer vision for heel strike detection
No full textIn some forms of gait analysis, it is important to be able to localise the heel within the frame in which the strike occurs. According to the motion characteristics of heel strikes, radial acceleration is ideal for estimating the spatio-temporal position of heel strikes in standard image sequences. Previous research of motion analysis has generally not yet considered the basic nature of higher orders of motion such as acceleration. Hence, in this thesis, acceleration first is computed in a principled manner by extending Horn and Schunck’s algorithm for global optical flow estimation. We then demonstrate an approximation of the acceleration field using an alternative established optical flow technique, since most motion in real world violate the global smoothness assumption. Further, we decompose acceleration into radial and tangential based on geometry.Compared with previous heel strike detection techniques, acceleration not only improves the precision significantly but also enables detection in real-time. Our new method also shows a good robustness in performance analysis with respect to noised image and occlusion. Acceleration is propagated as a general motion descriptor, it shows the capability for differentiating different types of motion both on synthesised data and real image sequences.Beyond acceleration, the higher-orders of motion flow and their continuant parts are preliminarily investigated for further revealing the chaotic motion fields. Naturally it is possible to extend this notion further: to detect higher orders of image motion. In this respect we show how jerk and snap can be obtained from image sequences. The derived results on test images and heel strike detection illustrate the ability of higher-order motion, which provide the basis for the following research and applications in the future
Elzalia Gerlach 1957
No full textGenus Elzalia Gerlach, 1957 Diagnosis. Cuticle striated; buccal cavity cylindrical, and strongly cuticulariZed; amphidial fovea circular; spicules elongated; conico-cylindrical tail with terminal seta.Published as part of Sun, Yan & Huang, Yong, 2017, One new species and one new combination of the family Xyalidae (Nematoda: Monhysterida) from the East China Sea, pp. 401-410 in Zootaxa 4306 (3) on page 402, DOI: 10.11646/zootaxa.4306.3.6, http://zenodo.org/record/84451
On parameterizing higher-order motion for behaviour recognition
No full textHuman behaviours consist different types of motion; we show how they can be disambiguated into their components in a richer way than that currently possible. Studies on optical flow have concentrated on motion alone without the higher order components: snap, jerk and acceleration. We are the first to show how the acceleration, jerk, snap and their constituent parts can be obtained from image sequences, and can be deployed for analysis, especially of behaviour. We demonstrate the estimation of acceleration in sport, human motion, traffic and in scenes of violent behaviour to demonstrate the wide potential for application of analysis of acceleration. Determining higher order components is suited to the analysis of scenes which contain them: higher order motion is innate to scenes containing acts of violent behaviour, but it is not just for¬ behaviour which contains quickly changing movement: human gait contains acceleration though approaches have yet to consider radial and tangential acceleration, since they concentrate on motion alone. The analysis of synthetic ¬and real-world images illustrates the ability of higher order motion to discriminate different objects under different motion. Then the new approaches are applied in heel strike detection in the analysis of human gait. These results demonstrate that the new approach is ready for developing new applications in behaviour recognition and provides a new basis for future research and applications of higher-order motion analysis
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Paragnomoxyala Jiang and Huang 2015
No full textGenus Paragnomoxyala Jiang and Huang, 2015 Diagnosis. Cuticle transversely striated; buccal cavity large, funnel-shaped or rectangular, with cuticulariZed walls; lips extended outwards; outer labial sensilla papilliform, only four cephalic setae; amphidial fovea circular; slender spicules straight, gubernaculum absent; tail conico-cylindrical with three terminal setae.Published as part of Sun, Yan & Huang, Yong, 2017, One new species and one new combination of the family Xyalidae (Nematoda: Monhysterida) from the East China Sea, pp. 401-410 in Zootaxa 4306 (3) on page 406, DOI: 10.11646/zootaxa.4306.3.6, http://zenodo.org/record/84451
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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