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Let's Teach Science
Canada
เข้าร่วมเมื่อ 30 มิ.ย. 2012
Learn about interesting topics in science including sport video analysis, biomechanics, signal processing, motor control, and measurement of human performance.
Musculoskeletal Injury Risk Factors in Ergonomics
Musculoskeletal injury risk factors for ergonomics.
มุมมอง: 679
วีดีโอ
Vertical jump height with force plate and accelerometer
มุมมอง 12K3 ปีที่แล้ว
Calculate vertical jump height for countermovement and squat jumps measured with force plate and accelerometer. We will be using the flight time and impulse-momentum methods to calculate jump height.
EMG Signal Processing in LabVIEW
มุมมอง 17K3 ปีที่แล้ว
In this tutorial, you will learn to perform basic signal processing techniques using EMG data in LabVIEW. Data are structured as 5 columns of EMG: VL, BF, TA, MG, Sol muscles and 2 columns of FSR: Toe, Heel. EMG FSR data can be downloaded from GitHub using the link below! github.com/DrewCommandeur/LabView_EMG_Data
Load and visualize .csv data in LabVIEW
มุมมอง 27K3 ปีที่แล้ว
Introduction to LabVIEW. Basic overview of data types, loading .csv files, and plotting data.
Video Presentation Tips and Editing in Davinci Resolve
มุมมอง 5K3 ปีที่แล้ว
In this video you'll learn video presentation tips to improve your audio and video quality. Learn about microphone selection, how to export images from Microsoft Powerpoint in high resolution, and basic video and audio editing techniques in Davinci Resolve.
Human Factors Engineering (Ergonomics)
มุมมอง 18K4 ปีที่แล้ว
Introduction to human factors engineering
Sprinting Linear Kinematics
มุมมอง 4K4 ปีที่แล้ว
Learn to calculate sprinting linear kinematics from timing gate split times.
Qualitative Anatomical Analysis
มุมมอง 1.8K4 ปีที่แล้ว
Learn about muscle contraction types and how to perform a qualitative anatomical analysis
Joint Marker Locations for Sport Video Analysis
มุมมอง 6K4 ปีที่แล้ว
Anatomical marker locations for video analysis
Kinovea Advanced Tools V9.3
มุมมอง 52K4 ปีที่แล้ว
Kinovea V9.3 learn to track objects and angles, export the data to excel, and use reference images.
Kinovea Basic Tools V9.3
มุมมอง 36K4 ปีที่แล้ว
Kinovea V9.3 overview of the basic tools and functions. Set up your preferences, draw lines, measure, save your work, and much more!
Sprinting Kinematics - Velocity and Displacement from IMU Acceleration
มุมมอง 4.1K5 ปีที่แล้ว
Sprinting Kinematics - Velocity and Displacement from IMU Acceleration
Deterministic Models: Evaluating a Performance
มุมมอง 2.6K8 ปีที่แล้ว
Deterministic Models: Evaluating a Performance
Welcome: University of Victoria Biomechanics
มุมมอง 6K8 ปีที่แล้ว
Welcome: University of Victoria Biomechanics
Thank you so much for this! I will be using this to look at and manipulate drone sensor data.
Hello, i have sine questions FOR labview? CAn you help ME? ( not FOR Free) thank you
Some*
Great help
wondful, Great help for me。
Na eng. Atoyebi send us come here ooo
This was so awesome. Thank You very much
Why is there no tracking for human model?
Hello, thank you so much for this video! Would it be possible to get the data as well please ?
Hello, I'm wondering if it's possible to calibrate the video using a tape measure on the ground (if you are measuring different distance from the left foot to a post in front of you) instead of using these foam balls? If yes, how would one go about doing this?
what do you do when you just have the graph and not the cell box data?
another whiteboard scientist???
Cómo se calcula la velocidad del cgc con kinovea?
i cant save my videoos in .mp4....
hey can you share me the kinovea .exe file, I’m not able to download from their website, both . exe and zip files are corrupted. Please help me out, urgently required for my project
I’ll share my email, please help me out
Great video thank you
What the problems or noise did you process in this signal ?
Nice sir
how can I calculate breaking force (eccentric) and propulsive force (concentric) from force plate data?
Wish I’d seen this two years ago, would have saved me a lot of time. This is pretty much my process now. Some great tips here. Thanks.
Glad it helped!
Thanks a lot for this you saved me! really appreciate :)
Wonderful!
Hi Its really amazing.Can you plz tell me how did you stick those foam balls with cloths?
We use double-sided tape. The cheapest tape that works well is carpet tape, but it's pretty hard on the clothes. The tape we use is toupee tape, it's expensive but it holds well and doesn't harm the clothes.
Great Tutorial. I have thing I'm trying figure out how to solve. I use Kinovea for analyzing rowing on water. Taking video on the water is not a stable thing, as you can do on dry land and mount your camera to the ground. Therefore my object (the boat and rowers) are moving, and my camera is moving too. Is there a way to, lets say set a tracking point on the boat, as a reference point, where i.e. a perspective grid is moving along with the tracking point. The thing with rowing is, that we must be able to see both the rowers together in a team boat and the oars at the same time, and then from there do the measurements and timing. The perspective grid is great to measure positions in an eight, but the frame after, the grid does not fit anymore, because both the camera and the boat has moved - and by the same path.
I would suggest using GPS on each boat as it will allow you to track the relative velocity which would allow you to calibrate your velocity for the video. I believe you can import a continuous data series to Kinovea now, so you would be able to display a graph of relative velocity overlaid on your video. I haven't tried this, but I do remember reading it in one of the release notes.
Hi, you might use tracking on the perspective grid itself and the coordinates and measurements of other objects will be in the moving coordinate system of the grid, so it's a way to "stabilize" your reference. Another way is that in the latest version (2024.1) we added a function to compute the camera motion, this is not quite compatible with measurements yet but I would be interested in looking at the sort of videos you are working with to see if it will work.
Doesn't the mass of the jumper have to be taken into consideration for the flight time method at all?
No it doesn't as gravity acts on all objects with a constant acceleration regardless of mass.
The leg only goes from 0 to 130. why does he have 170+?
Where did you purchase those motion caption markers?
From a craft store, they are just foam balls cut in half, and then a black circle is filled in with a permanent marker.
I'm curious to know, what is your education background? Also what textbooks did you read to learn all the information you currently know about doing all this motion analysis?
I have a PhD in biomechanics, I taught myself motion analysis in my undergrad, and have supplemented my knowledge with peer reviewed articles and discussion forums, not textbooks.
Very good tutorial, thanks
Glad it was helpful!
how do you get the markers used in the videos ? does it work without markers? need more info on the markers
The markers are just foam balls from a craft store that are cut in half. It does work without markers, but the tracking isn't as precise.
You're a hero!
It's perfectly ok to use optical zoom. In fact if it's possible, it's a good idea to move away from the subject and then zoom back in. This will make the light rays entering the sensor more parallel between each other and "flatten" the field. This reduces the perspective error when measuring things that are not exactly at the same distance from the camera.
Agreed, thank you for highlighting this! If you have access to optical zoom lenses, this is ideal! These tutorials are more targeted at students who are using action cameras (go pro etc.) or smartphones as they are much more commonly used for video analysis at this level. If you are using a DSLR or mirrorless camera with a zoom lense then this is ideal, as long as it is high quality glass. From my experience, I wouldn't recommend any of the optical zoom lenses that attach to action cameras as they tend to increase image distortion.
Thank you Drew
Great video!
great tuto. thanks
Super job !
Ri
Great video! Which Method is more precise? The impulse one or the Flight Time one?
The impulse method is better because it determines the vertical displacement of center of mass. The flight time method can be "cheated" by landing with your legs in a flexed position because it is based off of the time you are not in contact with the ground.
Thank you so much! I was wondering for so long, how to calibrate the meassurement in centimeters 🙏 Now I can progress with my physiotherapy diploma thesis faster.
👍 Great help
Why only vl graph is shown and others are remaing null?
I have the same problem
Check your raw data to make sure all channels are loaded. If you only see one row of data then likely you have an error setting the delimeter. Often this can happen if you set your delimiter to ", " instead of "," (adding a space after the comma means that it will never find the next row of data). If that isn't the issue, make sure you have indexed the correct channel that you want to display.
Hi, greate project. Can you share the project?
Great video!
Glad you enjoyed it
Sir can you explain how to insert perspective grid in kinovea?
You created a good video! It was packed with a lot of information. You probably could've made several videos out of this one video. But you had the information I was looking for with regards to the PowerPoint slides. You're an excellent teacher. You're very clear. Keep up the good work!
how do you add the header data as plot names?
You need to load the file in string format and then index out the row/column with your headers. You can then add that back in to the file after your analysis by writing the data to string and inserting the headers at the first row/column.
Very informative. Thank you!
can you please upload your csv file in the description
All of the files I want to import are .xlsx which doesn't seem to work with this method - do you have a tutorial on how to import .xlsx?
Try saving your file as a .csv
You can read .xlsx files natively in LabVIEW using the LabVIEW Report Generation Toolkit, but as Todd H suggested, I would just save them as .csv or .TDMS
downloaded this an hr ago - I love I can pinch and zoom but am I crazy , there is no volume when I play stuff where is the volume conroll ?
Kinovea does not support audio playback or recording!
Nice bit of science!