Sports simulator and simulation method
A sports simulator calculates spin of a sports object using image analysis. A velocity vector is also calculated. These are combined to produce a predicted future trajectory of the sports object. In one embodiment, the sports object is a golf ball and the sports simulator simulates golf.
1. An apparatus for simulating a sports activity where the future trajectory of a sports object is predicted, the apparatus comprising:
infrared strobe lights;
a strobe controller coupled to said infrared strobe lights;
a triggering device coupled to said strobe controller to flash said infrared strobe lights;
a camera that captures images viewed by said infrared strobe lights, wherein said images comprise said sports object and are captured by said camera in a single exposure by flashing said infrared strobe lights multiple times during said single exposure;
a display that shows a predicted trajectory of said sports object, wherein said display is located in a launch path for the sports object;
at least one position sensor, separate from the camera and comprising two predetermined planes located between an initial launch position for the sports object and said display, and configured to determine a time and position where the sports object passes through each predetermined plane; and
a computer that takes the captured images and computes a spin of said sports object based on edge detection analysis of the images and that takes the determined times and positions and computes a translational velocity of the sports object, wherein the computer further determines a predicted trajectory of the sports object based on the spin and the translational velocity.
2. The apparatus as claimed in claim 1 where said strobe lights emit infrared light and said camera is sensitive to infrared light.
3. The apparatus as claimed in claim 1 where an axis of said camera is approximately normal to the ground above a launch area.
4. The apparatus as claimed in claim 1 further comprising an infrared filter on said camera.
5. The apparatus as claimed in claim 1 where the triggering device opens a shutter on said camera.
6. The apparatus as claimed in claim 1 where the triggering device comprises a microphone.
7. The apparatus as claimed in claim 1 where the triggering device comprises a motion detector.
8. The apparatus as claimed in claim 1 further comprising an inclinometer mounted on said at least one infrared camera.
9. The apparatus as claimed in claim 1 , wherein said position sensor comprises an infrared beam sensor.