Global shutters expose the entire sensor at once. Global versus Rolling Shutter: This refers to the method used to "expose" the sensor. Frame rate should be set based on the temporal resolution you want for slow motion. On decent cameras shutter duration can be set independently from frame rate. But blur reduction is solely due to shorter shutter duration. NOTE: People incorrectly seek to increase frame rate to reduce motion blur. The sky's the limit and it gets incrementally nicer (read $$) the higher you go. Higher is better, slow motion analysis require at least 60 fps to capture enough (barely) frames on the downswing. NOTE: Higher shutter speeds require more light for the same result (ie twice the shutter speed will require twice the light).įrame rate (FPS): The number of images captured per second. Good cameras allow shutter speed to be set independent of frame rate (ie one can set the shutter to be open 1/2000 second to stop blurring even at 30 fps). On normal video it defaults to 1/fps (ie at 30fps the shutter would be open 1/30 second). Amount of blur depends on the distance an object moves during the time the shutter is open. Shutter Speed (Duration): This controls image blurring. With that in mind here are a few key definitions/concepts one should understand. Finally I will recommend an el cheapo system to get you started.
How to get kinovea to have moving angles how to#
They will also cover how to set up properly to record a golf swing. The next several posts will cover the background knowledge needed to select such a system. There is a lot more one could ask for but this list is a decent place to start.
How to get kinovea to have moving angles software#
If you look at when the reference angle (X-axis) is at 90°, you can see that the knee angle is around 118 to 120°.Every few months there's a new thread asking what hardware and software is available to record our golf swings. Then go to Tools > angle-angle diagrams, and you should get something like this: You track these for a while: right click on each angle and do "tracking > start tracking", then progress frame by frame verifying that the auto-tracking is solid and adjust it along the way when necessary, then "tracking > stop tracking" when you are done. It will read 90° when the pedal is at 6 o'clock and less than 90° otherwise. Then add another angle for the knee joint angle. This way the angle is always less than 90° when the pedal is up, and 90° when it's at 6 o'clock. Set one of its leg horizontal and the other vertical, with the end of the horizontal leg tracking the pedal or a marker on the foot, aligned with the pedal, and the other two points placed in such a way that the background behind them will not change.
You could add a regular angle tool to act as a reference for when the pedal hits the 6 o'clock mark. If you can show how you normally measure it for a single cycle maybe I can come up with a better solution. There might be a simpler way to do this with a custom tool and I'm not an bike fitting expert so please take the following as inspiration only. There is a tool for "angle-to-vertical" but unfortunately it is not usable with the angle-angle diagram at the moment. I need the angle value when the leg is in 6 oclockĭo you mean when the leg is vertical or when the crank is vertical and the pedal is at the 6 o'clock of the sprokets?
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