公开(公告)号：US09632036B2

公开(公告)日：2017-04-25

申请号：US14716901

申请日：2015-05-20

Applicant: Keyence Corporation

Inventor： Zhuoli Sun

IPC: G01N21/88 ,  H04N13/02 ,  G06T7/00

CPC classification number: G01N21/8806 ,  G01N2201/06 ,  G06T7/0004 ,  G06T7/0008 ,  G06T7/586 ,  G06T2207/10152 ,  G06T2207/30164 ,  H04N13/207 ,  H04N13/254

Abstract: An image inspection apparatus includes: an imaging section for capturing an image of a workpiece from a certain direction; an illumination section for illuminating the workpiece from different directions at least three times; an illumination controlling section for sequentially turning on the illumination sections one by one; an imaging generating section for driving the imaging section to generate a plurality of images; a normal vector calculating section for calculating a normal vector with respect to the surface of the workpiece at each of pixels by use of a pixel value of each of pixels having a corresponding relation among the plurality of images; and a contour image generating section for performing differential processing in an X-direction and a Y-direction on the calculated normal vector at each of the pixels, to generate a contour image that shows a contour of inclination of the surface of the workpiece.