公开(公告)号：US10571405B2

公开(公告)日：2020-02-25

申请号：US16099706

申请日：2017-05-17

Applicant: BOBST MEX SA

Inventor： Matthieu Richard ,  Francis Pilloud

IPC: G01N21/89

Abstract: A quality control station (2) for a sheet element processing machine, having at least one camera (6) arranged for capturing images of sheet elements (4) transported through the quality control station (2), and further having an illumination unit (5) with at least one light emitter (16) and two reflectors (12, 14), the illumination unit (5) directing light onto a viewing area of the camera (6) such that the illumination intensity is constant despite changing media thickness. An illumination unit for such quality control station is disclosed.

公开(公告)号：US11022553B2

公开(公告)日：2021-06-01

申请号：US16099042

申请日：2017-05-29

Applicant: BOBST MEX SA

Inventor： Matthieu Richard ,  Francis Pilloud

IPC: G01N21/57 ,  G01N21/86 ,  G01N21/89 ,  G01N21/88

Abstract: A surface inspection system (10) for inspecting the surface of sheet elements (4) present in an inspection area (20). The system includes an image evaluation unit (18), a camera (12), a dark-field illuminator (14) and a bright-field illuminator (16). The image evaluation unit (18) subtracts a line image captured under bright-field illumination conditions from a line image captured under dark-field illumination conditions. A method of identifying highly reflective surface areas on a sheet element (4) being moved through a sheet element processing machine, wherein first a line image (I16) of the surface of the sheet element (4) in the viewing area (20) is captured under bright-field illumination conditions and a line image (I14) of the same surface of the sheet element (4) in the viewing area (20) is captured under dark-field illumination conditions, and then the two line images (I14, I16) are compared, in particular subtracted from each other, wherein the surface is identified as being reflective if the difference (Sn) between the two line images (I14, I16) is above a predefined threshold.

公开(公告)号：US11792537B2

公开(公告)日：2023-10-17

申请号：US17593327

申请日：2020-03-18

Applicant: BOBST MEX SA

Inventor： Francis Pilloud ,  Pablo Antolinez ,  Olivier Porret

IPC: H04N23/90 ,  H01S3/00 ,  H04N23/698

CPC classification number: H04N23/90 ,  H01S3/0071 ,  H04N23/698

Abstract: This invention is about an imaging system that uses conventional cameras and a single laser line to perform quality control at the output of a converting machine or a press. The system uses several cameras distributed over the width of the printed sheets. Thanks to the laser line, it can reconstruct the complete image of the printed matter even when the sheets are not perfectly flat or at varying height, compensating geometric as well as photometric distortions. The use of conventional cameras results in a cost effective system.

公开(公告)号：US11448501B2

公开(公告)日：2022-09-20

申请号：US16098576

申请日：2017-05-17

Applicant: BOBST MEX SA

Inventor： Matthieu Richard ,  Francis Pilloud

IPC: G01B11/26 ,  G01N21/89 ,  G06T7/00 ,  G01N21/956 ,  G01B11/00 ,  G06T7/586 ,  G06V10/60 ,  G06V10/143 ,  G06V10/145 ,  G06V10/147 ,  G06V10/75 ,  G06V30/144

Abstract: An image capturing system (10), and a corresponding method, for determining the position of an embossed structure (30) on a sheet element (4) moved though a viewing area (18). It includes a camera (12) adapted for capturing a line image of the surface of the sheet element (4) in the viewing area (18), and an illumination unit (14) with a plurality of light sources (20, 21, . . . ) each adapted for illuminating the viewing area (18). The light sources (20, 21, . . . ) are arranged at different inclinations with respect to the viewing area (18). An image evaluation unit (16) determines an inclination-related parameter for the surface of the sheet element (4) in the viewing area (18) across the viewing area (18).

公开(公告)号：US11169095B2

公开(公告)日：2021-11-09

申请号：US16301024

申请日：2017-05-29

Applicant: BOBST MEX SA

Inventor： Matthieu Richard ,  Francis Pilloud

IPC: G01N21/89 ,  G01N21/88

Abstract: A surface inspection system for inspecting the surface of sheet elements present in an inspection area: The system includes two light sources arranged adjacent each other on opposite sides of an illumination plane, and a camera for capturing line images of the inspection area along a viewing plane. The illumination plane and the viewing plane are arranged on opposite sides of a median plane perpendicular to an inspection plane. The angle between the illumination plane and the median plane is the same as the angle between the viewing plane and the median plane. In a method of using the system, the first light source illuminates the sheet element before the second light sources does. An image evaluation unit compares the captured line images with each other.