Would a good trail camera with PIR, saving to the replay folder, by USB make this work....?
31 2022-11-04 08:29:25
Re: Using Kinovea for checking the long jump board? (16 replies, posted in Ideas and feature requests)
32 2022-11-03 17:17:12
Re: Using Kinovea for checking the long jump board? (16 replies, posted in Ideas and feature requests)
HI Joan,
I tried out Kinovea "as is" and it could very nicely be configured to start a 1,5s video by the sound of impact on the board (a photo cell would be more secure in a noisy environment, of course), send the video to be played in slow motion by another instance of Kinovea on a second screen for visual check. I have drawn a line not to be crossed before the foot lifts off the board. With a ground contact time of 0,1-0,15 seconds, there will be 3-5 pictures at 30fps, 6-10 at 60fps, 10-15 at 100fps. An interpolated line of no crossing would increase the sensitivity...as well as higher resolution.
It is important that the video can be saved for the jury, in case there is a disputed jump.
As I know, the new rule has not yet been restricted to any age-groups - if there is a board, the jump should be judged by the new rule of foul.
Are you familiar with the android application Photo Finish, developed by the brothers Johann-Lukas and Arthur Voigt? They use two picture on both sides of an arbitrary line and count the pixels along the line to estimate the intermediate crossing.
33 2022-11-01 13:30:00
Topic: Using Kinovea for checking the long jump board? (16 replies, posted in Ideas and feature requests)
Hello
The long jump rules were changed in 2021 to the jumper not crossing the vertical plane of the line on the board - using plasticine is not enough anymore, but the board should be checked by video. The available systems are pretty expensive, so i wondered if the Kinovea could be used for this:
A high quality smartphone or GoPro/clone with the highest possible resolution and 60+ fps connected by USB?
Kinovea is very handy when using the recording&playback screens, placing a virtual line to the board, recording the take-off and quickly swiping the clip to the playback, where one can zoom in at the details....and save the clip to be reviewed later if necessary.
The needed resolution is probably higher than HD (2K?) and fps 60-120?
Could this be achieved?