公开(公告)号：US09417123B2

公开(公告)日：2016-08-16

申请号：US14271652

申请日：2014-05-07

Applicant: MITUTOYO CORPORATION

Inventor： Hiroyuki Yoshida ,  Satoshi Takafuji ,  Naoki Shirai

IPC: G01J1/32

CPC classification number: G01J1/32

Abstract: A value of a current corresponding to a relationship between an illumination intensity instruction value and illumination intensity is calculated based on a previously obtained relationship between a current flowing through a light emitting device and the illumination intensity. A calibration table including the illumination intensity instruction value, the calculated value of the current, and the illumination intensity is created. A required illumination intensity is calculated based on exposure time per frame during autofocusing. An illumination intensity instruction value corresponding to the required illumination intensity is calculated using the calibration table. The calculated illumination intensity instruction value is set using the calibration table such that brightness of a measured image remains consistent even when a frame rate is changed.

Abstract translation: 基于先前获得的流过发光器件的电流与照射强度之间的关系，计算与照明强度指示值和照度之间的关系对应的电流值。 产生包括照明强度指示值，计算出的电流值和照明强度的校准表。 基于自动对焦期间每帧的曝光时间计算所需的照明强度。 使用校准表计算对应于所需照度的照明强度指示值。 使用校准表设定计算出的照明强度指示值，使得即使改变帧速率，测量图像的亮度也保持一致。