Measurement system comprising angle adjustment module

• US 10,210,625 B2
• Filed: 10/30/2015
• Issued: 02/19/2019
• Est. Priority Date: 10/30/2015
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Tseng, Kun-Lung, Lin, Ming-Hui, Yang, Shih-Wen
• Primary Examiner(s): Beck, Leron
• Application Number:
  US14/927,488
• Publication Number:
  US 20170124724A1
• Time in Patent Office: 1,208 Days
• Field of Search: 348142
• CPC Class Codes: G01B 11/02 for measuring length, width or thickness G01B11/08 takes precedence
• CPC Class Codes: G01B 11/24 for measuring contours or curvatures
• CPC Class Codes: G01N 2021/9518 using a surface follower, e.g. robot
• CPC Class Codes: G01N 21/9515 Objects of complex shape, e.g. examined with use of a surface follower device measuring contours and curvatures G01B11/24
• CPC Class Codes: G06T 2207/10152 Varying illumination
• CPC Class Codes: G06T 2207/30164 Workpiece; Machine component
• CPC Class Codes: G06T 7/0004 Industrial image inspection
• CPC Class Codes: G06T 7/60 Analysis of geometric attributes

Abstract

A measurement system comprises an illumination module, an image pickup device, an angle adjustment module, and a control unit. The illumination module is configured to illuminate an object. The image pickup device is configured to pick up an image of the object. The angle adjustment module is configured to adjust an relative angle between the object and the image pickup device. The control unit is electrically connected to the image pickup device and the angle adjustment module and configured to receive an image signal from the image pickup device. The control unit is configured to command the angle adjustment module to adjust the relative angle to at least three values. The image pickup device is configured to pick up images of the object respectively corresponding to the at least three values. The control unit is configured to calculate the relative angle between the object and the image pickup device.

Claims

1. A measurement system configured to measure an object, the measurement system comprising:

an illumination module configured to illuminate the object;

an image pickup device configured to pick up an image of the object;

an angle adjustment module configured to adjust a relative angle between the object and the image pickup device; and

a control unit electrically connected to the image pickup device and the angle adjustment module and configured to receive an image signal from the image pickup device, the control unit being configured to command the angle adjustment module to sequentially adjust the relative angle to at least three different angles including an initial relative angle respectively having different unknown angle values, the image pickup device being configured to pick up images of the object respectively corresponding to the at least three different angles respectively having different unknown angle values, the control unit being configured to calculate the relative angle according to the images of the object respectively corresponding to the at least three different angles respectively having different unknown angle values and command the angle adjustment module to adjust the relative angle to a measurement angle according to the calculated relative angle, so as to pick up and measure the image of the object under the measurement angle,

wherein a length of the object is automatically measured by the measurement system when the initial relative angle is adjusted to be zero based on calculating the initial relative angle using the corresponding images of the object corresponding to the at least three different angles respectively having different unknown angle values.

2. The measurement system according to claim 1, wherein under the measurement angle, an optical axis of the image pickup device is substantially perpendicular to a measured surface of the object.

3. The measurement system according to claim 1, wherein under the measurement angle, an optical axis of the image pickup device is substantially parallel to a processed surface of the object.

4. The measurement system according to claim 1, wherein the relative angle is an angle rotating around a single axis or comprises two angle components respectively rotating around two different axes.

5. The measurement system according to claim 1, wherein the angle adjustment module comprises at least one actuator supporting back-and-forth motion.

6. The measurement system according to claim 1, wherein the illumination module is configured to provide a plane light source emitting a parallel light or a diffusive light to the object.

7. The measurement system according to claim 1, wherein the control unit comprises:

an image signal capturing device configured to receive the image signal from the image pickup device;

a computing device configured to perform an algorithm to calculate the relative angle; and

a command signal output device configured to output a command signal to the angle adjustment module so as to adjust the angle adjustment module according to the calculated relative angle.

8. The measurement system according to claim 1 further comprising a carrier configured to carrying the object, wherein the angle adjustment module is connected to the carrier and configured to rotate the carrier.

9. The measurement system according to claim 1, wherein the angle adjustment module is a manipulator configured to fix the object and adjust an orientation of the object.

10. The measurement system according to claim 1, wherein the angle adjustment module is a manipulator configured to fix the image pickup device and the illumination module and adjust an orientation of the image pickup device and the illumination module.

11. The measurement system according to claim 1, wherein the relative angle is an angle between the normal of a measured surface of the object and an optical axis of the image pickup device.

12. The measurement system according to claim 1, wherein the relative angle is an angle between a processed surface of the object and an optical axis of the image pickup device.

13. The measurement system according to claim 1, wherein the object is disposed between the illumination module and the image pickup device, and the object, the illumination module and the image pickup device are arranged on a straight line.