公开(公告)号：US10410346B2

公开(公告)日：2019-09-10

申请号：US15448978

申请日：2017-03-03

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Guruprasad Somasundaram ,  Evan J. Ribnick ,  Ravishankar Sivalingam ,  Aya Eid ,  Theresa M. Meyer ,  Golshan Golnari ,  Anthony J. Sabelli

IPC: G06K9/00 ,  G06T7/00 ,  G06F17/50 ,  A61C9/00 ,  A61C19/04 ,  G06T7/11 ,  G06T13/20 ,  G06T15/08 ,  G06T19/20 ,  A61B5/00 ,  A61C7/00

Abstract: A method for detecting tooth wear using digital 3D models of teeth taken at different times. The digital 3D models of teeth are segmented to identify individual teeth within the digital 3D model. The segmentation includes performing a first segmentation method that over segments at least some of the teeth within the model and a second segmentation method that classifies points within the model as being either on an interior of a tooth or on a boundary between teeth. The results of the first and second segmentation methods are combined to generate segmented digital 3D models. The segmented digital 3D models of teeth are compared to detect tooth wear by determining differences between the segmented models, where the differences relate to the same tooth to detect wear on the tooth over time.

公开(公告)号：US20190043255A1

公开(公告)日：2019-02-07

申请号：US16075072

申请日：2017-02-03

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Guruprasad Somasundaram ,  Robert W. Shannon ,  Evan J. Ribnick ,  Ravishankar Sivalingam

IPC: G06T17/20

Abstract: Reconstructed surface meshes can be generated based on a plurality of received surface meshes. Each surface mesh can include vertices and faces representing an object. The received surface meshes can be assigned to one of a plurality of groups, and a region of interest of each surface mesh within each group can be aligned. The reconstructed surface meshes can be generated based on the aligned regions of interest for each group.

公开(公告)号：US20160282279A1

公开(公告)日：2016-09-29

申请号：US15032735

申请日：2014-10-16

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Evan J. Ribnick ,  John A. Ramthun ,  David D. Miller

IPC: G01N21/898 ,  G01N21/84 ,  G06T7/40 ,  G06T7/00 ,  G06T3/40 ,  G06T5/20 ,  G01N21/88 ,  G01N21/89

CPC classification number: G01N21/8983 ,  G01N21/8422 ,  G01N21/8851 ,  G01N21/8915 ,  G01N21/892 ,  G01N2021/8427 ,  G01N2021/8887 ,  G01N2021/8917 ,  G01N2201/12 ,  G06T3/40 ,  G06T5/20 ,  G06T7/0004 ,  G06T7/11 ,  G06T7/44 ,  G06T2207/20016 ,  G06T2207/20021 ,  G06T2207/30124

Abstract: A method for characterizing the uniformity of a material includes selecting a set of size scales at which to measure uniformity within an area of interest in an image of the material; suppressing features in the image smaller than a selected size scale of interest within the set of size scales; dividing the image into patches equal to the size scale of interest; and calculating a uniformity value within each patch.

Abstract translation: 用于表征材料的均匀性的方法包括选择一组尺寸尺度，以测量材料的图像中感兴趣区域内的均匀性; 抑制所述图像中的特征小于所述一组尺寸尺度内的所选尺寸尺度; 将图像分成等于感兴趣的大小尺度的补丁; 并计算每个贴片内的均匀度值。

公开(公告)号：US20150009301A1

公开(公告)日：2015-01-08

申请号：US14375002

申请日：2013-01-30

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Evan J. Ribnick ,  Yi Qiao ,  Jack W. Lai ,  David L. Hofeldt

IPC: G06T17/10 ,  H04N13/02 ,  G01B11/24

CPC classification number: G06T17/10 ,  G01B11/002 ,  G01B11/24 ,  G01B11/303 ,  G06T7/571 ,  G06T2200/04 ,  G06T2200/08 ,  G06T2207/10016 ,  G06T2207/10028 ,  G06T2207/30124 ,  G06T2207/30136 ,  G06T2219/2004 ,  H04N13/221

Abstract: A method includes imaging a surface with at least one imaging sensor, wherein the surface and the imaging sensor are in relative translational motion. The imaging sensor includes a lens having a focal plane aligned at a non-zero angle with respect to an x-y plane of a surface coordinate system. A sequence of images of the surface is registered and stacked along a z direction of a camera coordinate system to form a volume. A sharpness of focus value is determined for each (x,y) location in the volume, wherein the (x,y) locations lie in a plane normal to the z direction of the camera coordinate system. Using the sharpness of focus values, a depth of maximum focus zm along the z direction in the camera coordinate system is determined for each (x,y) location in the volume, and based on the depths of maximum focus zm, a three dimensional location of each point on the surface may be determined.

Abstract translation: 一种方法包括用至少一个成像传感器对表面进行成像，其中表面和成像传感器处于相对平移运动。 成像传感器包括具有相对于表面坐标系的x-y平面非零角度对准的焦平面的透镜。 沿相机坐标系的z方向记录并堆叠表面的一系列图像以形成体积。 对于体积中的每个（x，y）位置确定焦点值的清晰度，其中（x，y）位置位于与摄像机坐标系的z方向垂直的平面中。 使用焦点值的清晰度，针对体积中的每个（x，y）位置确定摄像机坐标系中沿Z方向的最大焦点zm的深度，并且基于最大焦点zm的深度，三维位置 可以确定表面上的每个点。