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Kinovea - Forums → Posts by velocanman
I am also getting started using the PS3Eye and it looks like a great camera. I am hoping to be able to run simultaneous capture from two cameras, front and side.
If you use the PS3 Eye, check out this thread for a link to the drivers and Kinovea config file.
http://www.kinovea.org/en/forum/viewtopic.php?id=531
Be sure to report back your findings, and good luck!
I might give this a try. The following link shows just some of the possibilities with the Kinect for marker-less tracking. It is a complicated instrument but a lot of folks are hacking it so there are drivers, middleware, and applications available.
http://www.ipisoft.com/gallery.php
I'm not sure if it has the precision needed.
Jon,
I sincerely appreciate the reply. You picked up a key point that my laptop VGA only provides output!
You were also correct that my camera (and others) don't stream via USB. I was suggesting USB in the event there was a converter available. The ones I located will stream to USB 3.0 but not 2.0. As you know, it is a data rate issue.
I have done some research and I would be best suited going to a desktop with a HDMI capture card. Until I make that investment I will have to stick with transferring the video via the USB cable or removing the card. I don't like taking memory cards in/out so I'll probably use the cable transfer. It is a little cumbersome since I am using the HDMI out to display the video on a TV for the athlete to view during recording.
Something like the Intensity Shuttle by Blackmagic Design might do the trick if I added a USB 3.0 card to my laptop:
Thanks!
Alan
I am interested in feedback on what video capture cards and methods folks are using to successfully capture video in real time from a DV camera to Kinovea.
My camera is a Canon T2i with Mini-HDMI output. Video recording is set to 1280x1024 at 60 fps. Shutter speed is unknown.
I can record video to the card, but for processing in Kinovea I have to unplug the HDMI, plug in the USB, and copy across to the laptop, then open it up in Kinovea.
I am using a laptop, so my available options for input include:
VGA
USB 2.0
PCMCIA card
A Mini-HDMI to VGA cable might work but I'm not sure what quality degradation I will experience dropping down to VGA.
Excellent questions. I will try to answer the ones that I can:
1. The LEDs are 5mm white, 7000 mcd, 25 mA. "High brightness" on the package is accurate.
2. The LEDs have a 30 deg viewing angle. Semi-directional? I did not have an issue aligning with the emission cone. The more important issue is aligning the camera with the bicycle for the parallel and orthogonal views.
3. The camera used is a Canon T2i DSLR. The maximum ISO is 6400, not sure if that applies in the video mode though. Resolution used was 1280x720 at 60 fps. Use the higher fps to capture the foot/pedal motion. I have AF disabled during filming and the shutter/AE locked. So I'm not sure what shutter speed or exposure setting was. My estimate is that the motion blur was minimal and acceptable, based upon the clarity in the screen captures. The posted image is significantly compressed.
4. The LED did not saturate the video but there is some diffusion in the LED image. A lower intensity LED might actually be preferred but I need to check with higher ambient lighting first.
I appreciate the feedback on the sunlight reflections. I understand it helps to mask reflective surfaces on the bike. It may be impractical with all the brushed aluminum in the component groups, but I can look into it. I may try out retroreflective tape both in- and outdoors. I don't like the bright lights for indoor use but I've seen some folks publish good results.
I am just getting into this, and am a complete novice at digital video, so I have to apologize for the ignorance. I appreciate all input and feedback.
Hello Cool,
Sorry for the belated post, but I just discovered the Kinovea software a few months ago.
I am experimenting with the software for detailed real-time and post-processing for road bike fit. I will be publishing the results in the near future. I will try to keep up with the forums here, but you can also follow some of my progress at
http://www.facebook.com/velocanman
In my experience, you will need to use active markers for tracking. LEDs are compact, light, bright, and cheap.
For static and dynamic bike fit you can use the angle function to measure leg angles at top and bottom dead center of the pedal stroke. Also check the back and arm angles with hand on the top of the bars, hoods, and in the drops. I have some examples on my Facebook page and will soon be adding more.
Following is an image from video taken during a road bike ride of the time trial position of a cyclist prior to a race. I was able to advise the cyclist to focus on dropping his heel, or raise his saddle, to increase leg extension, and to move the pads rearward for an elbow angle closer to 90°.
Regards,
velocanman
Greetings. My experience is similar to yours. There is not sufficient contrasting in the image of the knee for Kinovea to use as a marker frame-by-frame.
I just posted an image and graph of my use of LED markers for road bike fit frontal knee tracking in Kinovea.
http://www.kinovea.org/en/forum/viewtopic.php?id=404
I had very low ambient indoor lighting for this experiment. I will follow up with higher ambient lighting to improve the digital camera performance.
I did not experiment extensively with retroreflective markers. My experience was the lighting required was distracting to the cyclist. It might be useful for outdoors, but I believe these LEDs might also work in sunlight.
As discussed in the other post, I use a CR2034 battery holder as the base for the LED markers.
Hello. I realize this is an older post but I wanted to share my experience with LED tracking and a variation of the "LED Throwie" that I developed.
Following is a photo of frontal knee tracking for road bike fit using 5 mm LED markers on each knee:
The minor variation on the LED Throwies that I use is I soldered the 5mm white LED to a CR2032 battery holder. I used epoxy to seat the LED on the battery holder and protect the terminals. The on/off function is simply removal of the battery. These and small, sturdy, and easily taped to a desired body part.
As an aside, following is a graph of the data from the above track. I exported to Excel for the graphing. I'm looking for anyone that has developed a Visual basic script to automate the Excel import for data selection.
Regards,
Alan
Kinovea - Forums → Posts by velocanman