Difference between revisions of "PhoXi 3D scanners family"

Revision as of 09:06, 15 October 2018

This page contains technical description of PhoXi 3D Scanners. For scanning guide, see Scanning best practices.

General specification

For model/size specific parameters see our product showcase.

Specification Parameters Explanation

Depth Map resolution

Maximum number of rendered points (the resolution of camera sensor)

Point size

The average distance between two neighboring points on the point cloud of a plane located in the focus distance of the camera. Alternatively, the square of the point size is the average surface sampled by one 3D point on the plane scanned in the focus distance of the camera.

Relation of point size to scanning distance

Absolute accuracy

The accuracy of point measurement as the result of device calibration (can be understood as the space deformation). It is the standard deviation of the measurement error in the whole measurement range of the device.

Absolute accuracy is measured by scanning multiple planes at different distances from the scanner. Below you can see a scan of the plane done by the PhoXi 3D Scanner model S at the distance of 411mm. The red points are closer to the plane and the blue points are further away form the plane

Absolute accuracy is the average distance of the 3D points from this plane.

Z noise

The standard deviation of the noise (measured on a diffuse surface with 80 percent albedo). The noise level describes the quality of the sensor to capture local surface details. The noise distribution of our sensor is similar to Gaussian distribution. Can be understood as temporal noise.

Below is a graph depicting the Standard deviation of depth (Z-noise) values of 3D points for different scanning distances for the PhoXi 3D Scanner model S.

Equivalently, Z-noise can also be defined as the average distance of the 3D points from the average Z-value of the 3D points.

FPS

Maximum number of triggered frames per second, in fastest acquisition mode

Data acquisition time - best case

Fastest possible acquisition time

Data acquisition time - worst case

Longest expected acquisition time (bad lighting conditions, dark shiny objects)

3D points throughput

Number of 3D points that can be reconstructed in a second in sequential scans

Connectivity

CAD data

Contains 3D Scanner body and its scanning volume as a solid object.

Available CAD models for download:

Note: Camera coordinate space is only approximate.

Mounting plate drawing

Connecting multiple scanners to one computer

Using PhoXi Control

From version 1.2.X of PhoXi Control it is possible to connect to two scanners at the same time and trigger the scans one after another.

Connect to the first scanner, then click menu -> network discovery and then click the second scanner you want to connect to. You will then have two tabs as you can see in the picture below and then you can change between the two tabs by clicking on them.

Using the PhoXi API

Connecting mutliple scanners can also be done using the PhoXi API, you can download the example code for this here.

Important points to note are: 1)define SCANNER_HWID_1 and SCANNER_HWID_2 to the correct Hardware identification strings of your scanners

2)do not attempt to create 2 instances of pho::api::PhoXiFactory, instead create just 1 factory and call CreateAndConnect method twice to get 2 pointers to different scanners