公开(公告)号：US12196542B2

公开(公告)日：2025-01-14

申请号：US17744451

申请日：2022-05-13

Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE

Inventor： Jhe-Ruei Li ,  Wei-Shiang Huang ,  Tsai-Ling Kao ,  Chun-Yi Lee

IPC: G01B11/25

Abstract: A calibration method of three-dimensional measurement system includes a projection device, a camera and a processor. The projection device projects structural light to a reference object including a first calibration surface and a second calibration surface. The camera photographs the reference object to obtain at least one reference object image. The processor performs decoding according to the at least one reference object image to obtain a plurality of pieces of phase data of the at least one reference object image. The processor computes a first phase corresponding to the first calibration surface and a second phase corresponding to the second calibration surface according to the phase data, calculates a surface phase difference between the first phase and the second phase, and computes according to the surface phase difference and a height of the second calibration surface relative to the first calibration surface to obtain a phase-height conversion parameter.

公开(公告)号：US11120545B2

公开(公告)日：2021-09-14

申请号：US16837597

申请日：2020-04-01

Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE

Inventor： Chun-Yi Lee ,  Tsai-Ling Kao ,  Hian-Kun Tenn

IPC: G06T7/00 ,  G06T7/149 ,  G01B5/12

Abstract: A method for measuring a hole provided in a workpiece is provided and the method comprises: obtaining a three-dimensional point cloud model of the workpiece and a two-dimensional image of the workpiece, defining a first contour in the three-dimensional point cloud model based on an intensity difference of the two-dimensional image, defining a second contour and a third contour respectively based in the first contour, bounding a data point testing region between the second contour and the third contour, respectively defining data point sampling regions along a plurality of cross-section directions of the data point testing region, respectively sampling data points in the data point sampling regions to obtain a turning point set comprising turning points, wherein each of the turning points has the largest turning margin, connecting the turning points which are distributed in the turning point set along a ring direction to obtain an edge of the hole.