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Possibilities of texture based motion analysis
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Reglerteknik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Reglerteknik.
2006 (engelsk)Inngår i: Computer Methods and Programs in Biomedicine, ISSN 0169-2607, E-ISSN 1872-7565, Vol. 84, nr 1, s. 1-10Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Analysis of motion patterns in the human locomotion apparatus is important in many clinical areas like orthopaedics, physiotherapy, neurology, and sports medicine. Today marker based human motion analysis (HMA) is completely dominant in the clinical context. Technically, these systems are stable and dependable, and about a dozen variants are commercially available. One drawback of such systems is the time consuming and error prone marker placement.

The purpose of the present contribution is to show that it is possible, with existing simple technology and methods, to build systems that do not depend on anatomically placed markers and yet produce an accuracy in knee joint center estimation comparable to marker based systems.

It is shown that texture based methods can give estimates of knee joint center of rotation that can be compared to knee joint center estimates from marker based systems. Due to different definitions of the knee joint center position some bias is seen between the two estimates.

sted, utgiver, år, opplag, sider
2006. Vol. 84, nr 1, s. 1-10
Emneord [en]
motion, analysis, texture, marker, knee, human
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-82945DOI: 10.1016/j.cmpb.2006.06.010ISI: 000241319100001PubMedID: 16942816OAI: oai:DiVA.org:uu-82945DiVA, id: diva2:110852
Tilgjengelig fra: 2007-06-10 Laget: 2007-06-10 Sist oppdatert: 2018-01-13bibliografisk kontrollert
Inngår i avhandling
1. Estimating Human Limb Motion Using Skin Texture and Particle Filtering
Åpne denne publikasjonen i ny fane eller vindu >>Estimating Human Limb Motion Using Skin Texture and Particle Filtering
2008 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Estimating human motion is the topic of this thesis. We are interested in accurately estimating the motion of a human body using only video images capturing the subject in motion. Video images from up to two cameras are considered.

The first main topic of the thesis is to investigate a new type of input data. This data consists of some sort of texture. This texture can be added to the human body segment under study or it can be the actual texture of the skin.

In paper I we investigate if added texture together with the use of a two camera system can provide enough information to make it possible to estimate the knee joint center location. Evaluation is made using a marker based system that is run in parallel to the two camera video system. The results from this investigation show promise for the use of texture. The marker and texture based estimates differ in absolute values but the variations are similar indicating that texture is in fact usable for this purpose.

In paper II and III we investigate further the usability in images of skin texture as input for motion estimation. Paper II approaches the problem of estimating human limb motion in the image plane. An image histogram based mutual information criterion is used to decide if an extracted image patch from frame k is a good match to some location in frame k+1. Eval- uation is again performed using a marker based system synchronized to the video stream. The results are very promising for the application of skin texture based motion estimation in 2D. In paper III, basically the same approach is taken as in paper II with the substantial difference that here estimation of three dimensional motion is addressed. Two video cameras are used and the image patch matching is performed both between cameras (inter-camera) in frame k and also in each cameras images (intra-camera) for frame k to k+1. The inter-camera matches yield triangulated three dimensional estimates on the approximate surface of the skin. The intra-camera matches provide a way to connect the three dimensional points between frame k and k+1 The resulting one step three dimensional trajectories are then used to estimate rigid body motion using least squares methods. The results show that there is still some work to be done before this texture based method can be an alternative to the marker based methods.

In paper IV the second main topic of the thesis is discussed. Here we present an investigation in using model based techniques for the purpose of estimating human motion. A kinematic model of the thigh and shank segments are built with an anatomic model of the knee. Using this model, the popular particle filter and typical simulated data from the triangulation in paper III, an estimate of the motion variables in the thigh and shank segment can be achieved. This also includes one static model parameter used to describe the knee model. The results from this investigation show good promise for the use of triangulated skin texture as input to such a model based approach.

sted, utgiver, år, opplag, sider
Uppsala: Universitetsbiblioteket, 2008. s. 78
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 568
Emneord
Human motion analysis, Skin texture, Monte Carlo estimation, Particle filter, Mutual Information, Simulated Annealing, Marker-free, Rigid body transformation, 2D correlation
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-9352 (URN)978-91-554-7327-3 (ISBN)
Disputas
2008-11-28, Room 2446, House 2, Polacksbacken, Lägerhyddsvägen 2, Uppsala, 09:15
Opponent
Veileder
Tilgjengelig fra: 2008-11-07 Laget: 2008-11-07 Sist oppdatert: 2018-01-13bibliografisk kontrollert

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