AlpineReplay
Contents
About
The project was started in 2010 at the initiative of Anatoly Lokshin, CEO of AlpineReplay ltd. The project involves AlpineReplay ltd., HORIS ltd. and Department "Theoreticla Mechanics" SPbPU. The main objective of the project is creating a mobile application for the skiers and snowboarders, allowing to measure parameters of their movement: trajectory, speed, number of jumps, stunt parameters, air time, number of calories spent and much more.
Areas of research
Employees and students of Department "Theoreticla Mechanics" conduct research within "AlpineReplay" project in following areas:
- development of the jump detection algorithm based on fuzzy logic
- identification of the rotation angle of a skier in a jump
- development of gyroscope calibration algorythm
- development of the algorithms in MATLAB and C++
Demonstration
Download AlpineReplay application
You can download AlpineReplay application using following liks:
Basic stunts of skiers and snowboarders
- Spin
Spins, as a rule, are performed in increments of 180 °, depending on the nature of the obstacle. Terms "frontside" and "backside" are used to describe snowboarder's spinning. "Frontside" indicates the direction of spin: snowboarder in goofy stance rotates clockwise, and in regular stance - counterclockwise. For "backside" clockwise rotation is typical for regular stance and counterclockwise - for goofy stance. You don't need those terms for describing skiers’ spinning.
Term "Cab"(сaballerial) means any frontside snowboarder's spin without performing a stance (regardless of half-turns number).
Rotation is called "Cork" when the skier’s or snowboarder's rotation axis is oriented sideways or moves up or down in the air and doesn't usually become completely inverted (although head and shoulders should fall below the board or skis).
- Flip
Flip is a rotation around the horizontal axis, i.e. through the head. There are front flip, back flip and lincoln loop (side flip for skiers).
It is also important not only to perform tricks, but also perform it technically correct. Performing stunts is just a part of a job: the technique also matters a lot. So, during the world competitions ability to keep balance, smoothness of the stunt, and, importantly, a touchdown is rated. For example, a significant number of points is removed for a touch of hand on landing.
It should be noted that it's not always possible to tell the difference between the rotation types without watching a replay.
Fig.1. Stances: regular and goofy
Fig.2. Frontside 360
Fig.3. Backside 360
Fig.4. Cab 540
Fig.5. Triple Cork
Fig.6. Front Flip
Fig.7. Back Flip
Videos of the most spectacular stunts
Site of the project
www.alpinereplay.com - social network for skiers and snowboarders
www.traceup.com - buy TRACE
Patents
1. Lokshin A.M., Kuzkin V.A., Roberts-Thomson C.L. Use of gyro sensors for jump detection, U.S. Patent Application № 62/001 935, May 28, 2014.
2. Lokshin A.M., Kuzkin V.A. Systems and methods for identifying and characterizing athletic maneurs. US patent, Application № 13/932 899, 2013.
3. Lokshin A.M., Kuzkin V.A. Method and apparatus for determining sportsman jumps using fuzzy logic. U.S. Patent Application № 13/612 470, Dec. 09, 2012.
4. Lokshin A.M., Kuzkin V.A., Dvas N.G. Device and method of gyro sensor calibration. US patent, Application № 13/291 844, 2011.
