The Human Kinetics Program (HKP) Building In The Philippines
The experiment was conducted at the Human Kinetics Program (HKP) Building in the University of the Philippines – Baguio.
The terrain was prepared by distributing an even layer of gravel on the ground, and the background was covered by black cloth spanning the length of the terrain. The subject was also dressed in black to match with the background. The boules, jack, and significant joints and points on the subject’s body were marked with green bands to contrast with the background. A throwing circle was placed at one end of the terrain while the jack was placed 6 m, 7 m, 8 m, and 9 m away from the nearest edge of the circle, depending on the set being recorded. A DSLR camera, with a frame rate of 25 fps, was used to focus on the subject, and …show more content…
These three throws were recorded as a single set. After each set, the distances between the boule and jack were recorded.
In order to obtain an experimental value for the coefficient of restitution, a boule was dropped repeatedly from a known height onto the terrain and each trial was recorded.
3.2 Video Postprocessing
In measuring the experimental coefficient of restitution, the recordings were then analyzed by measuring the height of the boule at release with its peak height after bouncing. Both heights were measured from the point of the boule’s impact with the ground. Figure 3.1: The setup for measuring the coefficient of friction. The boule’s point of impact is marked by the blue x, while its peak height after bouncing is marked by the red x.
C_R=(peak height of boule after bounce)/(height of boule at release) (3.1)
This procedure and calculation was done for all recordings. The experimental coefficient of restitution was then obtained by taking the average value from all …show more content…
Each segment was trimmed such that the first frame coincided with the peak of the player’s pull back; that is, the first frame of each segment coincides with the first frame of the boule being accelerated prior to the throw. Segments from focus videos each had a duration of 3 seconds to adequately cover the movement of all joints and points of interest from the initial frame to the frame of release, while the range video segments each had a duration of 4 seconds to capture the trajectory of the boule from the initial frame to the frame it stops moving, called its rest frame. The video segments were then loaded through a Matlab program that records the coordinates of all joints per frame for the duration of the segment. This was done by detecting regions of points that fulfill a certain threshold of color and size, and highlights their geometric centers, called centroids. The user can then select a highlighted centroid on a marker to track its coordinates at every frame for the duration of the segment. This process was repeated for all markers in the Focus videos, and for the boule, wrist, and elbow markers only in the Range
The terrain was prepared by distributing an even layer of gravel on the ground, and the background was covered by black cloth spanning the length of the terrain. The subject was also dressed in black to match with the background. The boules, jack, and significant joints and points on the subject’s body were marked with green bands to contrast with the background. A throwing circle was placed at one end of the terrain while the jack was placed 6 m, 7 m, 8 m, and 9 m away from the nearest edge of the circle, depending on the set being recorded. A DSLR camera, with a frame rate of 25 fps, was used to focus on the subject, and …show more content…
These three throws were recorded as a single set. After each set, the distances between the boule and jack were recorded.
In order to obtain an experimental value for the coefficient of restitution, a boule was dropped repeatedly from a known height onto the terrain and each trial was recorded.
3.2 Video Postprocessing
In measuring the experimental coefficient of restitution, the recordings were then analyzed by measuring the height of the boule at release with its peak height after bouncing. Both heights were measured from the point of the boule’s impact with the ground. Figure 3.1: The setup for measuring the coefficient of friction. The boule’s point of impact is marked by the blue x, while its peak height after bouncing is marked by the red x.
C_R=(peak height of boule after bounce)/(height of boule at release) (3.1)
This procedure and calculation was done for all recordings. The experimental coefficient of restitution was then obtained by taking the average value from all …show more content…
Each segment was trimmed such that the first frame coincided with the peak of the player’s pull back; that is, the first frame of each segment coincides with the first frame of the boule being accelerated prior to the throw. Segments from focus videos each had a duration of 3 seconds to adequately cover the movement of all joints and points of interest from the initial frame to the frame of release, while the range video segments each had a duration of 4 seconds to capture the trajectory of the boule from the initial frame to the frame it stops moving, called its rest frame. The video segments were then loaded through a Matlab program that records the coordinates of all joints per frame for the duration of the segment. This was done by detecting regions of points that fulfill a certain threshold of color and size, and highlights their geometric centers, called centroids. The user can then select a highlighted centroid on a marker to track its coordinates at every frame for the duration of the segment. This process was repeated for all markers in the Focus videos, and for the boule, wrist, and elbow markers only in the Range