Motion analysis system
Patent 5459793 Issued on October 17, 1995. Estimated Expiration Date: 
October 17, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 17, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3840699 Volumetric balance video tracker Image processing device suitable for obtaining the volume and center of gravity of a three-dimensional binary image Apparatus and method for recognizing image features using color elements Method and apparatus for analyzing a body having a marker located thereon Video camera Patent #: 5083209 InventorsApplicationNo. 939837 filed on 09/02/1992US Classes:382/165, Pattern recognition or classification using color348/155, Motion detection348/157, Sporting event348/172, Centroidal tracking702/169Center of gravityExaminersPrimary: Boudreau, Leo H.Assistant: Tran, Phuoc Attorney, Agent or FirmForeign Patent References
International ClassG06K 009/00Foreign Application Priority Data1990-01-24 JPAbstractA motion analysis system utilizing an image processing technique includes a color marker attached to an object which is to be analyzed. Each color marker has a high directivity reflective member on a surface thereof, and the reflection member reflects light having a particular wavelength. A light source generates light for irradiation onto the color marker. A color TV camera aligned in roughly the same direction as that of the light source receives reflected light from the color marker and outputs a color image. A color extraction unit connected to the TV camera, extracts only a particular color from the color image produced by the TV camera. An area calculation unit connected to the color extraction unit, calculates the area of the particular color extracted by the color extraction unit. A diaphragm adjustment unit connected between the TV camera and the area calculation unit adjusts the diaphragm of the TV camera so as to make the area calculated by the area calculation unit equivalent to the actual color area of the color marker and a center of gravity calculation unit connected to the area calculation unit, calculates a position of the center of gravity of the particular color based on the area calculated by the area calculation unit.Other References
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