Camera calibration is a critical problem in computer vision. This paper presents a new method for extrinsic parameters computation: images of a ball rolling on a flat plane in front of the camera are used to compute roll and pitch angles. The calibration is achieved by an iterative Inverse Perspective Mapping (IPM) process that uses an estimation on ball gradient invariant as a stop condition. ...

To determine what factors are associated with successful free throw (FT) shooting in wheelchair basketball and to examine the relationship between shooting mechanics and player classification, a biomechanical analysis of clean shots was undertaken. Significant differences were observed between the player classes in FT shooting mechanics employed for a clean shot. Players from Classes 1 and 2 te...

this study intended to compare the effect of consuming creatine and mixed creatine-carbohydrate supplementations on the anaerobic power and cellular damage indices (ck, ldh) in males aged between 15 and 18 in the city of kouhrang. for this purpose, 36 subjects (mean age 16.42±0.90 yrs, weight 54.85±9.96 kg, and height 167.75±8.28 cm) were selected by available method. first, blood samples were ...

The motor skills of children can be used to determine whether or not the child's growth and development is impaired. aim study know effect brain jogging based learning model improving object control elementary school students. This was conducted using an experimental method with two groups, namely intervention. In comparison traditional models (direct instruction), model. study's sample consist...

Baseball-specific athleticism, potential, and performance have been difficult to predict. Increased muscle strength and power can increase throwing velocity but the majority of research has focused on the upper body. The present study sought to determine if bilateral or unilateral lower-body field testing correlates with throwing velocity. Baseball throwing velocity scores were correlated to th...

The purpose of the present study was to investigate the influence of different degrees of opposition on ball velocity in the jump throw in elite, amateur and adolescent team handball players. Thus, one hundred and nineteen elite, amateur and under 18 team handball players performed jump throws under three different conditions: 1) without opposition, 2) with the opposition of the goalkeeper and ...

The manner in which the CNS deals with interaction torques at each joint in ball throwing was investigated by instructing subjects to throw a ball at three different speeds, using two (elbow and wrist) or three joints (shoulder, elbow, and wrist). The results indicated that the role of the muscle torque at the most proximal joint was to accelerate the most proximal joint and to produce the effe...

The direction of gaze during a single-ball throwing and catching task was analyzed to generate hypotheses regarding the optical information that participants used. Five intermediate and 5 expert jugglers threw and caught a single ball continuously with 1 hand while wearing a head-mounted eye tracker to monitor their direction of gaze. Participants were instructed to throw the ball at 3 self-pac...