Use of patterned, structured light to detect and measure surface defects on a golf ball

• US 20040247170A1
• Filed: 06/06/2003
• Published: 12/09/2004
• Est. Priority Date: 06/06/2003
• Status: Active Grant

• Current Assignee: Acushnet Company (FILA Holdings Corp.)
• Original Assignee: Acushnet Company (FILA Holdings Corp.)
• Inventors: Mydlack, Thomas L., Furze, Paul A.
• Granted Patent: US 7,162,070 B2
• Time in Patent Office: Days
• US Class Current: 382/141
• CPC Class Codes: A63B 37/0003 Golf balls
• CPC Class Codes: A63B 37/0012 Dimple profile, i.e. cross-sectional view
• CPC Class Codes: G01B 11/25 by projecting a pattern, e.g. one or more lines, moiré fringes on the object G01B11/255 takes precedence ; image analysis for depth or shape recovery G06T7/50
• CPC Class Codes: G01N 21/8806 Specially adapted optical and illumination features
• CPC Class Codes: G01N 21/951 Balls
• CPC Class Codes: G06T 7/0004 Industrial image inspection
• CPC Class Codes: G06V 10/145 Illumination specially adapted for pattern recognition, e.g. using gratings

Abstract

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; rotating the ball about an axis; and detecting a shadow resulting from illumination by the first or second light sources.

Claims

1. 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;

rotating the ball about an axis; and

detecting a shadow resulting from illumination by the first or second light sources.

2. The method of claim 1, wherein the second area has a different geometric center than the first area.

3. The method of claim 1, wherein the golf ball has an equator or a parting line disposed between the first and second areas.

4. The method of claim 1, further comprising the step of capturing an image of the first and second areas with the first and second detectors.

5. The method of claim 1, wherein the first light source has a first wavelength range and the second light source has a second wavelength range different from the first.

6. The method of claim 5, wherein the first wavelength range is between about 480 nm and about 530 nm and the second wavelength range is between about 600 nm and about 680 nm.

7. The method of claim 1, wherein a first polarizer is located between at least one of the light sources and the golf ball and a second polarizer is located between the golf ball and at least one of the detectors, the second polarizer being oriented orthogonal to the first.

8. The method of claim 1, wherein the first or second detectors comprise a charge-coupled device, a photomultiplier tube, an avalanche photodiode, or a video camera.

9. The method of claim 1, wherein the first or second filters comprise a high-pass filter, a low-pass filter, a notch filter, or a holographic notch filter.

10. The method of claim 1, wherein the first or second light sources comprise a light-emitting diode, a laser, a colored lamp, or an arc lamp.

11. The method of claim 1, wherein the axis of rotation is perpendicular to a plane defined by the equator or parting line.

12. The method of claim 1, wherein the first and second areas are parallel and not overlapping.

13. A method of inspecting a golf ball, comprising the steps of:

translating a golf ball for inspection, the golf ball having an equator;

providing a first light source emitting a first color of light having a first wavelength range;

illuminating a first area of the golf ball with the first light source;

providing a first polarizer disposed between the first light source and the golf ball;

providing a second light source emitting a second color of light having a second wavelength range substantially different from the first;

illuminating a second area of the golf ball with a second light, the second area being parallel to and overlapping the first;

providing a second polarizer disposed between the second light source and the golf ball;

providing a first detector comprising a first filter for transmitting the first wavelength range and filtering out the second wavelength range;

providing a second detector comprising a second filter for transmitting the second wavelength range and filtering out the first wavelength range;

rotating the ball about an axis perpendicular to a plane defined by the equator;

capturing an image of the first and second areas with the first and second detectors; and

analyzing the image for a shadow indicative of surface defects.

14. The method of claim 13, further comprising the step of providing at least one third polarizer disposed between the golf ball and the detectors, the third polarizer being orthogonal to the first and second polarizers.

15. A method of inspecting a curved surface, comprising the steps of:

providing the curved surface for inspection;

providing a first light source emitting a first color of light having a first wavelength range;

illuminating a first area of the curved surface with the first light source;

providing a second light source emitting a second color of light having a second wavelength range substantially different from the first;

illuminating a second area of the curved surface with a second light, the second area being parallel to the first;

providing a first detector comprising a first filter for transmitting the first wavelength range and filtering out the second wavelength range;

providing a second detector comprising a second filter for transmitting the second wavelength range and filtering out the first wavelength range;

rotating the curved surface;

capturing an image of the first and second areas with the first and second detectors; and

analyzing the images for a shadow indicative of surface defects.

16. The method of claim 15, wherein the curved surface comprises a golf ball center, golf ball core, golf ball layer, or a golf ball.