The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 2021
Filed:
Oct. 07, 2019
Trimble Jena Gmbh, Jena, DE;
Andreas Glimm, Weimar, DE;
Trimble Jena GmbH, Jena, DE;
Abstract
The present invention relates to a tracker and a surveying apparatus comprising the tracker, which improve the reliability of tracking a target. The tracker comprises a an image sensor arrangement having an imaging region composed of a plurality of pixels arranged in a matrix of columns and rows. The imaging region is arranged to take an image of a scene including the target. A controller receives or generates a timing signal indicating a time duration during which an illumination unit is switched on and off, controls the imaging region to take an image of the scene when the illumination unit is switched on, and reads out a subgroup of neighboring columns or rows constituting a stripe window of the imaging region so that an image section including the target is obtained, controls the imaging region to take another image of the scene when the illumination unit is switched off, and reads out another subgroup of neighboring columns or rows constituting another stripe window of the imaging region so that another image section including the target is obtained, and calculates a difference image section by determining a difference between the pixel values of the pixels of the image section and the other image section.