Science topic

# 3D Motion Analysis - Science topic

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Questions related to 3D Motion Analysis

Hi, I am analysing the influence of cognitive and emotional response on purchase intent.

I have a collection of Likert Scales (1= totally agree, 5=totally disagree) rating the phrases 'This makes me feel happy', 'this makes me feel inspired', 'this makes me feel sad', 'this makes me feel bored' etc. These were answered in response to a Facebook post.

the participants of the study then answered on another Likert scale (also 1= totally agree, 5 totally disagree) rating how the post influenced their purchase intent -rating the phrase 'This makes me want to purchase the product'

I am trying to find a relationships between the emotions and purchase intent, but unsure exactly which analysis on SPSS is more appropriate for this. I attempted a spearman correlation but not sure if it is the right fit and I am not sure how to read the results.

Any suggestions? Thank you!

Hello All

I'm trying to synchronize imu sensor with the Motion Capture system. Is this possible? If so, how?

thanks for answering

Alireza

There is a paper on it [

**Reference: Grim. O "Die Schwingungen Von Schwimmender Zweidimensionalen", korpern, HSVA, Report 171,1959**] but sorry to say that is in 'German language'.It will be nice of you if you help me to find another article or theoretical source.

(Thanks)

We already have transformed accelerometer and gyroscope into position. Our remaining challenge is to calibrate the Y axis correctly for a golf swing (this is the axis that measures perpendicular distance to the golf target. The Y axis 0 point is calculated based on the first 50- 100 miliseconds of activity. If this first movement is in the wrong plane the whole curve will be calculated incorrectly and the first movement will always be counted as zero. Instead we want the correct swing to be zero and any movement outside this correct swing to be either positive on the Y axis or negative. We know the movement of the correct swing plane in the first 100 miliseconds for a golfer, we can measure deltas or delta ratios. I suspect we need to make a fusion metric between accerometer data and gyroscope data and compare the deltas to the right backswing (in first 100 mileseconds). Looking for some scientific insight into this challenge we face please.

I would like to be able to import footage from 2 or more cameras to analyze the motion of mammals. Lmbs is what mainly interests me.

I know of MOKKA and SkillSpector but SkillSpector has been crashing.

Have you got more suggestions?

Looking to automate the process of analyzing video data from CPA experiments in rats. Currently looking into DeepLabCut and Tracktor, but I was wondering if there are any others that allow for analysis of time spent within multiple areas of video. Thanks in advance!

What is the best wall color of the lab to use with a IR cameras MoCap system (Qualisys, Vicon, Optitrack...)?
We have always used white walls, without any problems.
I read that blue color is the best option to use with the IR systems/spectrum.
What is your opinion? Any color in particular? (please add pantone-color number)

Thanks

Best,

Jose Heredia-Jimenez
Human Behavior & Motion Analysis Lab. HubemaLab.
University of Granada in Ceuta.

in general, for healthy people, in the 3D motion analysis to define the anatomical coordinate system on segments, one frame in static position is taken by the camera, which will make segment angular changes based on this. Now consider a patient with pelvic abnormalities. The pelvic anatomical frame in this case is defined as zero for a healthy person. It will be different now if a patient completes a corrective exercise. If these exercises affect on the pelvic inclination,our anatomical coordinate system will change in post test. As a result, may the effect of exercise be eliminated in the final results of the comparison of pelvic kinematic pre and post test.

What is the proposed solution?

Is there a resource to fully explain this?

in general, for healthy people, in the 3D motion analysis to define the anatomical coordinate system on segments, one

frame in static position is taken by the camera, which will make segment angular changes based on this. Now consider a patient with pelvic abnormalities. The pelvic anatomical frame in this case is defined as zero for a healthy person. It will be different now if a patient completes a corrective exercise. If these exercises affect on the pelvic inclination,our anatomical coordinate system will change in post test. As a result, may the effect of exercise be eliminated in the final results of the comparison of pelvic kinematic pre and post test.

What is the proposed solution?

Is there a resource to fully explain this?

Hi,

I'm working on organ motion modeling specifically for radiation therapy. We do 4D MR acquisition to extract the characteristics of a subject respiratory motion, which is essential for planning of the therapy.

I'm wondering if the intra-subject variability of the respiratory or cardiac motion is also important for some sort of diagnosis. To the best of my knowledge, current dynamic CT or dynamic MR based methods only reconstruct single average motion cycles.

As I'm not a clinician this question might sound quite naive. However, I'm happy for any hints and answers.

Best

Christoph

Hi,

I currently running a study and want to examine one particular aspect, I recorded data using scales of addiction of both cocaine and tobacco users, while also in conjunction with scales of positive affect, negative affect and effortless control. I want to assess the difference between 3 groups of my DV (Cocaine Users, Tobacco Users and Non-drug users) against my 3 independent variables. I have been currently trying to run a ANOVA but due to the way I have coded it, with DrugScores being one variable in SPSS containing the scores of tobacco and cocaine users, followed by the drug scores of non drug users, which are 0 (as they did not do complete either drug scales understandable) , however spss does not appear to let me run this, even after I have dummy coded DrugScores so SPSS knows what scores are what (e.g 1= cocaine users, 2= tobacco users and 3= non drug users) What statistical analysis would you think is the best?

Thank you

The test carried out in ELISA for ANA and CLIA for anti-dsDNA showed negative ANA and positive anti dsDNA result. Is there any condition for such scenario?

Hi,

I need to estimate the velocity of a series of points. I have the 3D coordinates of these points over time, recorded at 60 frames/s during a a weightlifting movement.

What are the standards in the field of biomechanics for this type of estimation (filter, derivation methods) ?

What are the errors if I simply use a numerical derivation method such as velocity = diff(position)./diff(time).

Best regards.

I want to detect motor units and specify their recruitment thresholds during 10s ramp contractions. At the moment, during our pilot work, our participants are doing the ramp contractions with visual feedback, since we are using a transparency that we attached to the screen with a triangle. Does anyone know any other alternative for this, such as using a script to insert the triangles in the software itself? Software: Spike 2.

Is there any software that can convert an video taken in 360

^{o}in to a 3d surface with triangular meshes to enable me to find out its surface areaCan somebody explain the process behind obtaining ground truth values from a motion capture device, which can be used for comparison with our proposed system like for eg: Kinect? tell me whether we have to do our work in the presence of both the 3D motion capture (ground truth) and our proposed system(Kinect)

Is it possible to use Divergence and curl of vectors as a local feature for 3D face recognition?

Dear all,

Greetings, I am interested in creating a full body model for Vicon (With Marker set) using the clusters to find the joint center unlike the plug in gait model which has got individual and wand markers.

The idea is to find the reliable joint center for all the major joints thereby reducing the error percentage in the 3D motion analysis (especially in terms of angle interpretations).

While post capturing the same data can be imported into matlab to find the angles and associated graphs for the same.

I will be more than happy to go on with a collaborative study on this.

Dear all,

Will be happy to know about the performance analysis (the areas to be looked into) in archery and Shooting to improve performance. Have planned for a 2D video analysis (3 Cameras, aerial, Lateral and posterior) and force distribution Center of Pressure (COP) between the foot using AMTI Force plates. However, need more literature support on this and any possibilities of incorporating 3D Mocap technology and any other additional available technology to this?

Available normative data and any further guidance will be of great support.

Thanks in Advance.

Studying elite baseball players and I understand the problems with the plug in gait model for issues including the location and reference of the glenohumeral joint centre, the definition of the anatomical coordinate system of the humerus, and the shoulder joint angle decomposition. Further, there appears no standardized model for throwing in research in this area, despite the ISB standards for upper limb modelling. Any help would be greatly appreciated!

For my dissertation I am lucky enough to research 3D MOT(multiple object tracking) software to identify progression in MOT. 3D MOT has a great clinical background with improving peripheral awareness, pedestrian avoidance for elders, recover from injury and it also boasts the ability to improve decision making. As the software I will be using is up and coming in the professional sporting environment I would like to test the relationship of MOT and decision making skills however the question arises as to is it possible to test decision making skills in a sport environment? And if so how? Is it academically backed?

I am working on 3D Explicit Dynamic model of in bore analysis of gun barrel in ABAQUS. My loading condition is pressure which varies with time.Now I have define magnitude as 1 and in amplitude I have defined the pressure time value which is varying with time .But I am not getting the desired displacement of bullet.

Thanks in advance

Please elaborate or refer a source:

How is procedural Generated Animation (PGA) using procedural programming techniques, as used in Games industry, different form Physics or Dynamics based Animation techniques for biped or quadruped locomotion?

I need to configure Osprey Digital RealTime System of Motion Analysis to my Laptop. If you have experience on initial configuration settings please be kind enough to share them.

Basically, I am new to 3D motion analysis and trying to figure out how to do it. This said, I lack basic knowledge regarding the issue. I only have experience with 2D gait analysis.

Say I already have video recording from multiple angles (and this is all I have), including video recordings for calibration purposes, and I now want to analyze a quadrupedal animal's motion, mainly focusing on joint movements of the limbs, and gait.

How would I proceed with this? What skills should I learn, what software should I use? File formats?

I am aware of this program:

But we do not have the budget to acquire it. So I am looking for workarounds and open-source/free programs.

I don't mind the learning curve or the requirements, I just need to figure out a way to do this.

Many thanks for your help. I am looking forward to your suggestions and comments.

P.S. I have tried SkillSpector, but I cannot import the videos. I tried several codecs/containers, but it just won't recognize them.

I am about to undertake some residual analysis to select a cut of frequency to smooth some 3D coordinate data I have collected.

The question I have is what trials I should use for the residual analysis. Should I select a number of random trials for each subject, mean for each marker and use that data? So the filter will be consistent between subjects and potentially different for each marker. Or run each subjects trials separately, so the filter can potentially be different between subjects and each marker?

Any help will be greatly appreciated, I've been unable to find any literature for guidance.

Thanks

Give me an example to compute the velocity of motion in video.

I have come across lots of non-linear stability measures used in fall prediction of the elderly, however these all require a large volume of gait cycles. Has anybody come across gait stability measures which can be used on say 5-10 gait cycles? I'm also interested in stabiltiy measures which utilise kinetic information. Thanks.

Is it through an inverse dynamics approach? How reliable/accurate are the joint moments? I want to determine if the plug-in-gait moments can be used as control parameters for a muscle force algorithm.

Does anyone know any special program to analyze 3D staples of cells (detected with an 510 ... Zeiss CLSM)? Imaris is to expensive. Has anyone a freeware suggestion. It would be great if this program produces files where you can zoom into the cell.

We are working with Vicon Nexus system, studying sprint and jump kinematics. The model we use is plug-in-gait full body and we are interested to obtain the subject's center of mass, but sometimes one or more markers are lost due to high speed of these actions. Is there any way to calculate CoM if any marker is missing?

I would like to calculate the three dimentional angles for some joints like shoulder and elbow. i know what it's mean but I don't know how to calculate them practically. I can calculate them with a IR base motion analysis system(Motion Analysis Corporation- Santa Rosa) but my current motion analysis system is "SIMI". It is a video base system. Unfortunately i don't know how to use that for this purpose, and it has a really bad manual, because u can't understand any thing in that.