Three-dimensional profile measurement using a flexible new multiview connection method

Abstract

A novel multi-view connection method is proposed for whole field three-dimensional (3D) profile measurement. Firstly 3D profiles of tested object from different views can be measured by using the digital fringe projection profilometry, and then these profiles are transformed into the common coordinate by applying transform matrix. With the help of a new determination method for the revolution axis of rotary stage, the direction vector and one point of the axis are achieved. To improve the computability and feasibility of coordinate transformation, the quaternion method is also used to get the transform matrix. Considering the error movements between the views, an effective method based on multi-aperture overlap scanning technique (MAOST) is presented, which can determine the relationship between two adjacent views from their overlapping areas. The connection of adjacent views is performed accurately in 3D space. Both computer simulation and experimental results are presented to verify the feasibility of proposed method.

Multiprojector Multicamera Structured Light Surface Scanner

“…A selection of particular interest is one which diagonalizes the Grammian matrix G of Eq. (10) and which makes Eq. ( 11) trivial to solve.…”

“…In the first approach partial scans are always obtained sequentially one after another with movement performed in-between the scans to change the FOV. Movement may be done by hand [6], however most often a rotating table [5], [7]- [10] is used to move the object. Sometimes a robotic arm [11], [12] is used to move the scanner.…”

A Multi-View Stereo Measurement System Based on a Laser Scanner for Fine Workpieces

“…In this section, the gauge ball point cloud data on the basis of the laser sensor were used to calculate spherical center coordinates and establish a revolution axis coordinate system with the axis central coordinate and normal vector. Sitnik [27] proposed a calibration procedure with a flat plane to calculate the revolution axis, and Zheng [28] introduced a flexible new multi-view connection method with a calibration cylinder. Based on these two methods, we propose a calibration method suitable for the laser sensor, and calculate the revolution axis by spherical constraint and improved least-square method.…”

Multiview 3D profilometry using resonance-based decomposition and three-phase shift profilometry

“…This second method has the advantage that the entire object can be imaged at once, allowing for real time whole object reconstruction, however has a limitation in that the interfering fringes can cause significant error if not separated fully. Zheng, Guo et al [7] used an N step phase shifting method to first image the object, and then employed a multi-view connection technique using quaternion based coordinate transform and multi-aperture overlap scanning technique (MAOST) to connect the views. A similar connection technique was used in [8] where the point cloud of the measured object is transformed into cylindrical coordinate system and connected via MAOST.…”