Patent ID: 7162070

Claim:
A method of inspecting a golf ball, comprising the steps of: providing a golf ball; providing a first light source emitting a first color of light; illuminating a first area of the golf ball with the first light source; providing a second light source emitting a second color of light different from the first color of light; illuminating a second area of the golf ball with a second light; providing a first detector comprising a first filter for transmitting the first color of light and filtering out the second color of light; providing a second detector comprising a second filter for transmitting the second color of light and filtering out the first color of light; providing a first polarizer located between at least one of the light sources and the golf ball and a second polarizer located between the golf ball and at least one of the detectors, the second polarizer being oriented orthogonal to the first: rotating the ball about an axis; and detecting a shadow resulting from illumination by the first or second light sources.