Master and Slave Machine Vision System

• US 20130070113A1
• Filed: 09/12/2012
• Published: 03/21/2013
• Est. Priority Date: 09/13/2011
• Status: Abandoned Application

• Current Assignee: Cognex Corporation
• Original Assignee: Cognex Corporation
• Inventors: Martinicky, Brian, Wu, Scott
• Application Number:
  US13/612,094
• Publication Number:
  US 20130070113A1
• Time in Patent Office: Days
• US Class Current: 348/211.3
• CPC Class Codes: G06T 1/20 Processor architectures; Processor configuration, e.g. pipelining

Abstract

The technology provides, in some aspects, methods and systems for triggering a master machine vision processor and a slave machine vision processor in a multi-camera machine vision system. Thus, for example, in one aspect, the technology provides a method that includes the steps of establishing a communications link between a slave machine vision processor and a master machine vision processor; receiving on the slave machine vision processor a data message from the master machine vision processor; and triggering the slave machine vision processor to perform a machine vision function, the triggering occurring at a frequency based upon the data message, wherein at least one triggering of the slave machine vision processor occurs independent of the master machine vision processor.

Claims

1. A method of master and slave machine vision triggering for use in a multi-camera machine vision system, comprising:

A) establishing a communications link between a slave machine vision processor and a master machine vision processor;

B) receiving on the slave machine vision processor a data message from the master machine vision processor; and

C) triggering the slave machine vision processor to perform a machine vision function, the triggering occurring at a frequency based upon the data message, wherein at least one triggering of the slave machine vision processor occurs independent of the master machine vision processor.

2. The method of claim 1, further comprising establishing a communications link between one or more additional slave machine vision processors and the master machine vision processor.

3. The method of claim 2, further comprising at least one triggering of the slave machine vision processor occurring independent of at lease one of the additional slave machine vision processors.

4. The method of claim 1, further comprising encrypting the data message sent from the master machine vision processor to the first slave machine vision processor.

5. The method of claim 1, further comprising associating an identifier of the master machine vision processor with the data message.

6. The method of claim 5, further comprising authenticating the data message, based upon the identifier, as originating from the master machine vision processor.

7. The computerized method of claim 1, further comprising triggering the slave machine vision processor to capture an image of an object with an image acquisition device associated with the slave machine vision processor.

8. The computerized method of claim 7, further comprising performing, with the slave machine vision processor, a machine vision function on the image, wherein the machine vision function comprises a function that recognizes patterns in the image, the patterns including any of letters, numbers, symbols, corners, or other discernible features of the object.

9. A method of master and slave machine vision triggering for use in a multi-camera machine vision system, comprising:

A) establishing a communications link between a master machine vision processor and at least a first slave machine vision processor and a second slave machine vision processor;

B) sending a data message from the master vision processor to at least the first slave machine vision processor; and

C) triggering the first slave machine vision processor to perform a machine vision function, the triggering occurring at a frequency based upon the data message, wherein at least one triggering of the first slave machine vision processor occurs independent of the second slave machine vision processor.

10. The method of claim 9, further comprising at least one triggering of the first slave machine vision processor occurring independent of the master machine vision processor.

11. The method of claim 9, further comprising defining a trigger limit for the first slave machine vision processor in the data message.

12. The method of claim 11, further comprising periodically sending additional such data messages to the first slave machine vision processor, wherein the period is based upon the trigger limit.

13. The method of claim 11, further comprising encrypting, with the master machine vision processor, the data message sent to the first slave machine vision processor.

14. The method of claim 13, further comprising decrypting, with the slave machine vision processor, the data message sent from the master machine vision processor.

15. A master and slave machine vision system, comprising:

A) a master machine vision processor in data communications with at least a first slave machine vision processor and a second slave machine vision processor via a network link;

B) the master machine vision processor sending a first data message to the first slave machine vision processor;

C) the master machine vision processor sending a second data message to the second slave machine vision processor;

D) the first and second slave machine vision processors each triggering to perform a machine vision function, the triggering occurring at a frequency based upon their respective first and second data messages; and

E) the first slave machine vision processor at least once triggering independent of the second slave machine vision processor.

16. The system of claim 15, further comprising the second slave machine vision processor at least once triggering independent of the first slave machine vision processor.

17. The system of claim 15, wherein the first and second data messages each include an identifier of the master vision processor.

18. The system of claim 17, wherein the first and second slave machine vision processors authenticate the first and second data messages, respectively, as originating from the master machine vision processor.

19. The system of claim 15, wherein the master machine vision processor encrypts the data messages sent to the first and second slave machine vision processors.

20. The system of claim 19, wherein the first slave machine processor decrypts the first data message and the second slave machine vision processor decrypts the second data message.