Embedded Files
Device placed on the ground
Device placed on the ground
Place the smartphone/tablet on the ground the camera pointing towards the trajectory of the ball. Make sure the orientation of the device is landscape and the distance between the device and the line on the ground along which the ball travels is between 2 and 3 meters (6.5 ft and 10 ft).
Adjust the angle of the device with respect to the ground so that the trajectory of the ball fits inside the camera's field of view.
Make sure the player is not standing inside the camera's field of view while the ball is being shot.
In this configuration, blades of grass may disturb the speed measurement process especially when the height of the grass is greater than the height of the device. In order to improve your speed measurement experience, you should consider keeping your device above the grass level (for example, you can put your device on top of a cardboard box).
Device mounted on a tripod
Device mounted on a tripod
Mount the smartphone/tablet on the tripod in landscape and point the camera towards the trajectory of the ball. The red button must be located on the right-hand side of the screen.
Adjust the angle of the device with respect to the ground so that the trajectory of the ball fits inside the camera's field of view.
Make sure the player is not standing inside the camera's field of view while the ball is being shot.
Additional information
Lighting conditions
Lighting conditions
Lighting conditions may have a significant impact on the speed measurement quality since the app relies on the camera to measure the speed of the ball. Currently, the app performs best outdoor in daylight as well as indoor in environments with good lighting conditions (bright and flicker-free lighting).
False trajectories
False trajectories
Disturbances in the camera's field of view may cause the speed measurement algorithm to produce a speed measurement while no ball was travelling in front of the camera. Even though the SPEEDUP technology was designed to filter out most of the real-world disturbances, make sure the camera's field of view does not contain a high level of visual pollution. In the event a false trajectory is detected, the speed measurement information produced by the algorithm may be ignored.
LIght source location
LIght source location
When the light source (e.g., the sun or an artificial source of light) is located in front (resp. at the back) of the camera, the ball appears generally dark (resp. bright) on the image since approximately only half of the ball is exposed to the light source. This fact must be taken into account when setting up a speed measurement session. As a rule of thumb, when the source of light is located in front (resp. at the back) of the camera, make sure that the background scene is not too dark (resp. not too bright) in order to maximize the contrast between the ball and the background (the speed measurement quality depends significantly on the contrast between the ball and the background scene, as they appear on the image).
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