发明名称 |
System and method for determining and controlling focal distance in a vision system camera |
摘要 |
This invention provides a system and method for determining and controlling focal distance in a lens assembly of a vision system camera using an integral calibration assembly that provides the camera's image sensor with optical information that is relative to focal distance while enabling runtime images of a scene to be acquired along the image axis. The lens assembly includes a variable lens located along an optical axis that provides a variable focus setting. The calibration assembly generates a projected pattern of light that variably projects upon the camera sensor based upon the focus setting of the variable lens. That is, the appearance and/or position of the pattern varies based upon the focus setting of the variable lens. This enables a focus process to determine the current focal length of the lens assembly based upon predetermined calibration information stored in association with a vision system processor running the focus process. |
申请公布号 |
US9076199(B2) |
申请公布日期 |
2015.07.07 |
申请号 |
US201314042943 |
申请日期 |
2013.10.01 |
申请人 |
Cognex Corporation |
发明人 |
Nunnink Laurens |
分类号 |
G01B9/00;G06T7/00;G01M11/02;H04N5/232;G03B3/10;G03B43/00;G02B3/14;H04N17/00 |
主分类号 |
G01B9/00 |
代理机构 |
Loginov & Associates PLLC |
代理人 |
Loginov & Associates PLLC |
主权项 |
1. A system for determining focal distance of a lens assembly comprising:
a liquid lens; a calibration assembly integral with the lens assembly, the calibration assembly including a projected pattern of light that variably projects upon a camera sensor receiving light from the lens assembly based upon a focus setting of the liquid lens; and a focus process that determines the focal distance of the lens assembly at the focus setting based upon predetermined calibration information with respect to the projected pattern of light. |
地址 |
Natick MA US |