公开(公告)号：US20210233267A1

公开(公告)日：2021-07-29

申请号：US17158252

申请日：2021-01-26

Applicant: COGNEX CORPORATION

Inventor： Torsten Kempf ,  Jens Rütten ,  Michael Haardt ,  Laurens Nunnink

IPC: G06T7/586 ,  H04N13/243 ,  H04N13/254 ,  H04N13/218

Abstract: Systems and methods are provided for acquiring images of objects. Light of different types (e.g., different polarization orientations) can be directed onto an object from different respective directions (e.g., from different sides of the object). A single image acquisition can be executed in order to acquire different sub-images corresponding to the different light types. An image of a surface of the object, including representation of surface features of the surface, can be generated based on the sub-images.

公开(公告)号：US20170357035A1

公开(公告)日：2017-12-14

申请号：US15689145

申请日：2017-08-29

Applicant: COGNEX CORPORATION

Inventor： Laurens Nunnink ,  Mario Joussen ,  Jörg Kesten ,  Michael Haardt

IPC: G02B3/14 ,  G02B7/08 ,  G02B7/00

Abstract: Systems and methods reduce temperature induced drift effects on a liquid lens used in a vision system. A feedback loop receives a temperature value from a temperature sensor, and based on the received temperature value, controls a power to the heating element based on a difference between the measured temperature of the liquid lens and a predetermined control temperature to maintain the temperature value within a predetermined control temperature range to reduce the effects of drift. A processor can also control a bias signal applied to the lens or a lens actuator to control temperature variations and the associated induced drift effects. An image sharpness can also be determined over a series of images, alone or in combination with controlling the temperature of the liquid lens, to adjust a focal distance of the lens.

公开(公告)号：US10690816B2

公开(公告)日：2020-06-23

申请号：US15689145

申请日：2017-08-29

Applicant: COGNEX CORPORATION

Inventor： Laurens Nunnink ,  Mario Joußen ,  Jörg Kesten ,  Michael Haardt

IPC: G02B3/14 ,  G02B7/00 ,  G02B7/08 ,  G02B26/00 ,  G02B7/02

Abstract: Systems and methods reduce temperature induced drift effects on a liquid lens used in a vision system. A feedback loop receives a temperature value from a temperature sensor, and based on the received temperature value, controls a power to the heating element based on a difference between the measured temperature of the liquid lens and a predetermined control temperature to maintain the temperature value within a predetermined control temperature range to reduce the effects of drift. A processor can also control a bias signal applied to the lens or a lens actuator to control temperature variations and the associated induced drift effects. An image sharpness can also be determined over a series of images, alone or in combination with controlling the temperature of the liquid lens, to adjust a focal distance of the lens.

公开(公告)号：US11651505B2

公开(公告)日：2023-05-16

申请号：US17158252

申请日：2021-01-26

Applicant: COGNEX CORPORATION

Inventor： Torsten Kempf ,  Jens Rütten ,  Michael Haardt ,  Laurens Nunnink

IPC: H04N13/254 ,  G06T7/586 ,  H04N13/218 ,  H04N13/243

CPC classification number: G06T7/586 ,  H04N13/218 ,  H04N13/243 ,  H04N13/254 ,  G06T2207/10152

Abstract: Systems and methods are provided for acquiring images of objects. Light of different types (e.g., different polarization orientations) can be directed onto an object from different respective directions (e.g., from different sides of the object). A single image acquisition can be executed in order to acquire different sub-images corresponding to the different light types. An image of a surface of the object, including representation of surface features of the surface, can be generated based on the sub-images.