ARC System Scanning Guide

ARC System Scanning Guide

Bellus3D ARC Scanning Guide

Version 1.14.0


This document describes how to scan a face using a Bellus3D ARC system. Please consult “Bellus3D ARC System Setup Guide” to set up and configure an ARC system for scanning.



Table of Contents

Before You Start Scanning

Checklist

Scan Tips

Scanning a Face (ARC7)

Scanning a Face (ARC4)

Scanning a Face (ARC1)

Self Scanning

Operator scanning

Viewing and Exporting a Face Model

Model Export Options


Before You Start Scanning

Checklist


Please check the ARC system is ready for scanning:

  1. All ARC cameras should be connected to a USB hub and the LED status light on each camera should be green.


  1. Make sure the horizontal arms are level. The center camera should be at the eye level and around 35cm (14 inches) from the eyes.

  1. Turn on the built-in LED frame lights (for ARC 4/7) and adjust the brightness of each light using the touch button next to the light. Adjust the brightness based on your environment lighting. In most office lighting, medium or low brightness level works the best to achieve uniform face scan lighting. 

    1. Turn on: Tap the button lightly.

    2. Brighten up: Tap and hold the button.

    3. Dim: Tap again and hold the button.

    4. Turn off: Tap the button lightly again. The current brightness level is remembered.

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Scan Tips


Please check the Scan Tips below before you start a new face scan.


  1. Tie long hair back and remove glasses. 

  2. Avoid strong back lights or bright windows. 

  3. Stay at least 3 feet in front of a wall behind your head. 

  4. Dark color hair may not scan well. You may need to wear a hair net or cap if your hair color is very dark.

  5. Stand straight during the scanning. Do not lean forward.


Scanning a Face (ARC7)

  1. Press the Scan button on the home screen of the Scan App to start scanning


  1. Follow the instructions on top of the screen and move your face to fit into the oval until it turns green. Once the button turns green, press the Capture Button (Green Circle).


  1. Follow the on screen instructions to look at the center camera and hold still for 3 seconds (or move slightly left/right). 


  1. Once the scanning is complete, you should see all 7 cameras’ captured images while it is processing the scan data.


            If you move away or to the side during the capture stage, you will be prompted to a warning message with incorrect view circled as shown below.


            For example, the head is off centered too much during scanning, which may cause part of the head being cropped


  1. While it is processing, you will be able to enter a name for saving your scan with. Please note that you scan has not been saved yet. You must export it locally or upload it to Face Cloud if you want to keep the scan.


Scanning a Face (ARC4)

There are two face scanning modes for ARC-4:

 

Face: to scan frontal face only. You will be asked to move your head slightly side-to-side. The scanning takes only 3 seconds. You don’t need to turn your head.


Full Head: for full head scanning. You will be asked to turn your head to look at each camera in turn in a counterclockwise motion. The scanning takes 8 seconds.


  1. Press the Scan button on the home screen of the Scan App to start scanning

  1. When the camera preview starts to show up on the screen, the capture button (white circle) is disabled and the oval is red if your face is not positioned correctly in the oval. 


  1. Move your face to fit into the oval until it turns green. Once the button turns green, press the Capture Button (Green Circle). This preview will time out and go back to the Home Page if it cannot find your face after 10 seconds. 


  1. Follow the on screen and audio instructions to finish a scan. 


For Face only scanning, you will be asked to slightly move your head left and right (not rotating your head). You only need to move a few inches to each side. Please keep the motion smooth and slow.

For Full Head scanning, please follow the instructions below. You start by looking at the front camera for 1 second, and then turn your head slowly for 45 degrees to face the left camera and pause for 1 second. You then turn similarly to the bottom camera and then the right camera and pause briefly at each camera, and finally back to the front camera in a counterclockwise motion. The entire scanning takes about 8 seconds.

 


  1. Once the scanning is complete, you should see all 4 cameras’ captured images while it is processing the scan data. If you notice that part of our head is cropped in the images, you may want to adjust your head position and re-scan.


If you move away or to the side during the capture stage, you will be prompted to a warning message with incorrect position view circled as shown below. The side view shows that your face is too far from the center camera.

  1. While it is processing, you will be able to enter a name for saving your scan with. Please note that your scan has not been saved yet. You must export it locally or upload it to Face Cloud if you want to keep the scan.



Scanning a Face (ARC1)

Self Scanning

There are two face scanning modes:

 

Face: to scan the frontal face only. You will be asked to turn your head left and right.

Full Head: for full head scanning. You will be asked to turn your head left, right, up and down.


  1. Press the Scan button on the home screen of the Scan App to start scanning

  1. Follow the instruction on the top of the screen and move your face to match the position and size of the oval in the video preview. The camera should be at the height of our nose tip and roughly 35cm away. The capture button (white circle) is disabled and the oval is red if your face is not positioned correctly in the oval. You will notice that ARC camera LED light turns white. 


  1. Move your face to fit into the oval until it turns green. Once the button turns green, press the Capture Button (Green Circle). This video preview will time out and go back to the Home Page if we cannot find your face after 10 seconds. 


  1. Follow the on-screen and audio instructions to finish a scan. You will be asked to look at the camera first, and then turn your head to the left, and to the right. For Full head mode, you will be asked to look up and down in addition to complete a scan. While turning your head, you should hold the same facial expression and look straight ahead at the direction you are turning (do not look at the screen while turning). The scanning process may take from 12-20 seconds depending on the scanning mode and your head turning speed.


  1. Once the scanning is completed, it will take around 30 seconds (depending on your computer processor speed) to process the scan data. While it is processing, you will be asked to enter a name for saving your scan with. Please note that your scan has not been saved yet. You must save it locally or upload to Face Cloud if you want to keep the scan.ARC1 

Operator scanning

For ARC1 Face scanning mode, we provided an operator scanning option. You can turn on this Operator scanning mode by going to the Setting menu -> Configuration -> Scanning Mode. Choose Operator Scanning.


You will be asked to hold the ARC camera pointing at the person you are scanning and move around to scan the person's face from different angles.


  1. After initialization is done, you may press the Scan button to start.


  1. Follow the instructions to finish the scanning. After each angle is done, you may choose to retake or proceed by clicking the Next button.


  1. Once all 4 angles are done, you may choose to click the PROCESS button to continue processing or CANCEL this scan.


  1. Enter a name for your scan, and wait for the processing to complete.


Viewing and Exporting a Face Model


After the scan processing is done, you can view your scan from the Model Viewer page. Toggle the Light Bulb button and Mesh Button to see different effects. If you like to keep the scan, press the Export Icon in the lower right corner of the Model Viewer to export your current scan to a 3D model file on your desktop. You may choose a different file format, mesh resolution, model smoothing, watertight mode (for 3D printing), and model orientation to get the right output for your needs. 


The export option is only available for the current scan. You cannot export the model later once you leave the current scan page (you will be warned if you try to leave a scan before saving it). However, if you have enabled uploading to Bellus3D Face Cloud (see ARC System Setup Guide for instructions), your models will be automatically saved to the Face Cloud after each scan. You can choose to export the model files any time later. You can browse all the models that you uploaded to the Face Cloud by selecting the Face Cloud items in the Settings menu.

Model Export Options

  • Mesh Triangulation:  The mesh triangulation format to save the model with. The default mesh triangulation is random and every scan will produce different triangles. Uniform triangulation (for full head scans only) will generate the same number of triangles every time. Output resolution, smoothness, and watertight options are ignored.

  • File format: The 3D file format to save the model with. Supported formats include obj, ply, stl and glb. Obj, ply, and glb include color texture maps.

  • Resolution: The resolution of the model. LD is the lowest resolution and MAX is full uncompressed resolution: 

    • LD: ~5K vertices for full head

    • SD: ~50K vertices for full head

    • HD: ~200K vertices for full head

    • MAX: ~1M vertices for full head (very large file)

  • Model Smoothing: Smoothing to be applied to the model. Minimum smoothing may preserve more details but also contain more noise or holes.

  • Watertight: For full head models only. Generate a watertight 3d printable file.

  • Landmarks: Also export facial and ear landmarks in both 2D (image space) and 3D (object space) coordinates. The face landmarks currently contain 77 facial points. The ear landmarks contain 16 points for each ear. Each set of landmarks will create a YML and a 3D OBJ file. Ear landmarks may not be available or reliable if the ears are not detected in the image.

  • Model Orientation: Select the output mesh coordinate system. 

  • Photos: Export photos of your face scan from different angles. Please check the article below for more details.

https://desk.zoho.com/portal/bellus3d/en/kb/articles/export-photos-option-for-bellus3d-face-scan

  • Mesh Reconstruction: Processing method for model reconstruction. Only available in Uniform Mesh Triangulation. Default is Depth-based. AI-Assisted means to reconstruct the back of the head and the neck with AI assisted processing to create a more natural looking head



After you click the Export button, the files will be exported to your default output folder: “C:\ProgramData\Bellus3D\ARC\Output. You can change the default output folder by clicking the edit button above or change it in the Settings menu. Each scan will be saved to a sub-folder using the model name and current export settings as the folder name. 


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