Video acoustical method and system for determining an impact point of a thrown body on a landing area

The video acoustical system for determining an impact point of a thrown body on a landing area, the body traversing a trajectory in the air from a take-off area towards the landing area, the impact point being defined by the body hitting on the landing area, the system comprising:

• acquisition means having at least a video camera to acquire video exposures of the body before and after impact of the body on the landing area at a predetermined frame rate,
• detection means including at least one microphone to detect an acoustical impact time at which the body impacts the landing area, and
• processing circuitry configured to
• calculate the trajectory of the body during the impact of the body on the landing area by analyzing the acquired video exposures,
• select a first exposure, of the acquired video exposures, immediately preceding the detected acoustical impact time, the first exposure being acquired at a first exposure acquisition time preceding the detected acoustic impact time and defining a first position of the body on the calculated trajectory,
• determine the impact point of the body along the calculated trajectory using a calculated difference between the detected acoustical impact time and the first selected exposure acquisition time, and
• display an image of the determined impact point,
• wherein the processing circuitry is further configured to
• calculate a speed of the body at the defined first position based on the first selected exposure and a second selected exposure acquired at a second exposure acquisition time preceding the first exposure acquisition time, which precedes the acoustical impact time, the second selected exposure defining a second position of the body along the calculated trajectory so that the speed is calculated from only the first and second exposures, both having exposure acquisition times prior to the impact of the body on the landing area, and
• determine the body impact point based on the calculated speed.