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DAVID 5 Manual

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10/31/2016
Introduction
Installation
Setup
Connections
Camera Positioning
Camera Setup
Projector Setup
Calibration
Scanning
SL Scanning
Scan Result
Pattern Parameters
Camera Control
Projector Control
Shape Fusion
Project
List of Scans
Cleaning
Alignment
Fusion
A-B Distances
Comparison
3D Viewer
http://www.david­3d.com/en/support/david5/print­version
DAVID ­ DAVID 5 Manual
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  • Page 1 10/31/2016 DAVID ­ DAVID 5 Manual Introduction Installation Setup Connections Camera Positioning Camera Setup Projector Setup Calibration Scanning SL Scanning Scan Result Pattern Parameters Camera Control Projector Control Shape Fusion Project List of Scans Cleaning Alignment Fusion A-B Distances Comparison 3D Viewer http://www.david­3d.com/en/support/david5/print­version 1/37...
  • Page 2 3D surface model of a real world object. Videos Tutorial videos for DAVID 5 are not available yet. Please feel free to watch our older DAVID 4 tutorial videos - the basic principle is similar: SLS-2 Tutorial 1 Installation...
  • Page 3 Shape Fusion 3D Viewer Before you connect any DAVID device to the PC, please install the DAVID software and drivers: 1. Connect the USB flash drive to your PC, then select "Browse" or Explorer / My Computer. 2. Start "DAVID_Setup_xxx.exe" (administrator rights required).

  • Page 4: Setup Type

    10/31/2016 DAVID ­ DAVID 5 Manual Introduction Installation Setup Connections Camera Positioning Camera Setup Projector Setup Calibration Scanning Shape Fusion 3D Viewer After successfully connecting all devices, you typically walk through the following steps: 1. Setup Type Select as "Setup Type". DAVID SLS‐X 2. Projector Setup Here you can select on which display device the stripe pattern is shown.
  • Page 5 5. Selection of camera(s) Under "Camera Setup", select your camera(s) (e.g. DAVID-CAM-3.1-M). The live image from the camera(s) is displayed. If you have two cameras, you can click on one of the preview images at the right hand side; that camera's image will then be shown at the center.

  • Page 6: Exposure Time

    10/31/2016 DAVID ­ DAVID 5 Manual Move the camera slide by loosening the thumbscrew so that the camera is aimed on projected pattern on the object. Then fix the camera slide. If the viewing range of the projector and / or camera contains much more than the surface to be scanned, you should reduce the working distance of the scanner (step 3).
  • Page 7 10/31/2016 DAVID ­ DAVID 5 Manual Typical live image with good setup and settings slider in the software should be set to maximum. You should only reduce it if a Projector Brightness clean modulation is not possible in the following. Adjust the mechanical aperture (dial A). The live preview at the right side will evaluate the brightness as colors.
  • Page 8 (size of the scanning area, working distance, brightness of the object) and must be calibrated like this. Setup Connections ↑ Connect the camera, the projector and the DAVID USB flash drive according to the wiring diagram to your computer. To connect the projector to your computer, you can use HDMI (recommended) or VGA. http://www.david­3d.com/en/support/david5/print­version 8/37...
  • Page 9 10/31/2016 DAVID ­ DAVID 5 Manual Connection diagram If you want to change the video source (e.g. HDMI to VGA), follow these instructions: 1. Press key ( key) on projector. Source ↑ 2. Select desired video source using keys. ↑ ↓ 3. Press key to confirm selection.

  • Page 10: Position Of The Camera

    10/31/2016 DAVID ­ DAVID 5 Manual Setup Camera Positioning ↑ Position of the camera The camera can be mounted on the right or left side of the projector: Size of the scan object / scan area Position of the camera (seen from rear) up to 110 mm...

  • Page 11: Rotation Of The Camera

    10/31/2016 DAVID ­ DAVID 5 Manual Left: Small object → short distances; Right: Large object → greater distances Rotation of the camera Rotate the camera by about 22° such that it aims at the projection area. To do this, loosen the thumbscrew under the camera. Set the rotation angle by means of the degree scale on the camera slide, then fix the thumbscrew.
  • Page 12 10/31/2016 DAVID ­ DAVID 5 Manual Setting the camera angle For very large objects, or objects with deep cavities, a smaller camera angle may be necessary. Angles less than 20° result in reduced scan quality (noise, inaccuracies). A very large camera angle (> 30°), may improve the scan quality a little, but is only suitable for very flat objects.

  • Page 13: Setting Up The Projector As Extended Desktop In Windows

    10/31/2016 DAVID ­ DAVID 5 Manual Setup Camera Setup ↑ Select your camera under "Setup / Camera Setup". This automatically sets recommended values for important properties (e.g. "Gain"). See also topic Camera Control. In case of limited USB bandwidth, the camera connection might become unstable. In that case, you can set that limits the maximum number of camera images per second.
  • Page 14 Your screen should be set as "main display". Make sure the projector is set as extended desktop ("Extend these displays"). This is necessary so that DAVID can project the stripe patterns, while the user interface is displayed on your screen.

  • Page 15: Select Screen

    10/31/2016 DAVID ­ DAVID 5 Manual So in case the main DAVID window is displayed on the projector, please grab its title bar with the mouse and drag it sideways onto the monitor. Projector name Native resolution Native refresh rate DAVID SLS-1 Acer K11...
  • Page 16 10/31/2016 DAVID ­ DAVID 5 Manual An advantage of the modular design of the DAVID 5 scanners is that it can be adjusted to scan a wide range of objects sizes. Therefore, a calibration (measurement of the scanner hardware in the software) is necessary so that the software can then obtain precise and undistorted 3D data at the correct scale. For this purpose, a 90°...
  • Page 17 10/31/2016 DAVID ­ DAVID 5 Manual Calibration pattern too small; Suitable calibration pattern; Calibration pattern too large Choose the calibration pattern whose size fits to the scanned object. The pattern should be slightly larger than the object / region to be scanned. For object sizes above ca. 200 mm, use the large 240-mm pattern on the back.
  • Page 18 4. Enter correct scale Typical setup for calibration Enter the correct scale length in the field. You can find it on the edge of the Calibration Scale [mm] selected calibration pattern. (30, 60, 120, or 240) 5. Check camera image http://www.david­3d.com/en/support/david5/print­version 18/37...
  • Page 19 You can move, tilt and rotate the scanner as a whole, and you can close the DAVID software and restart it without losing the calibration. You can also change the value of to adjust the brightness (red sine curves) to the respective Projector Brightness...
  • Page 20 10/31/2016 DAVID ­ DAVID 5 Manual object to be scanned. However, if you rotate or move camera and projector separately or adjust the focus (for example for scanning significantly larger or smaller objects), the entire calibration process must be repeated. ↑ Scanning Introduction Installation...
  • Page 21 10/31/2016 DAVID ­ DAVID 5 Manual Place the scanner and the object in front of each other, at the same distance as during setup and calibration. With a wrong working distance, the camera image and projected stripes would be blurred. If necessary, correct the distance between object and scanner, but by no means change the focus of camera or projector.
  • Page 22 Scan "Automatic Turntable" mode mode can be used for automatic scanning with the DAVID TT-1. After connecting Automatic Turntable the turntable, select the desired total scan angle and desired number of scans. Below, the rotation between scans will be shown. Click the Scan button to start a scan cycle. All scans will be added to the...
  • Page 23 At the end, click on the button after finishing the last scan in this sequence. Finish Sequence By choosing the correct Motion type, you are giving DAVID additional information that help align the scan sequence correctly: Free Motions You can perform any kind of motions with the object between scans of the sequence.

  • Page 24: Extended View

    This is possibly on the edge of Quality Check the scan or at transitions between light and dark areas. You can change the filter value and see the effect immediately on the scan. The recommended value is 0.5. Background Removal http://www.david­3d.com/en/support/david5/print­version...
  • Page 25 10/31/2016 DAVID ­ DAVID 5 Manual You can automatically remove an undesired background from your scene. First, run a Background Scan Second, ensure that is activated. This procedure needs to be repeated whenever the Background Removal background changes relative to the scanner. Please keep in mind that you get best results when you use a deep black background.
  • Page 26 10/31/2016 DAVID ­ DAVID 5 Manual There is also a mode that let's you set the scan parameters to your requirements. Custom ↑ Scanning Camera Control setup types all camera properties and the camera format is set up automatically. For DAVID SLS‐x custom setups, you can change the setup by clicking on Camera Properties...
  • Page 27 10/31/2016 DAVID ­ DAVID 5 Manual Scanning Projector Control ↑ With you can reduce the maximum projector brightness digitally. The default value is Projector Brightness the maximum value, 255. Depending on the used projector, drastic decreases of projector brightness (e.g. from 255 to 20) can have a significant impact on scan quality.
  • Page 28 Load Project loads an existing one into DAVID 5. Using projects should be the preferred method to save your data in DAVID 5. It is much faster and easier than using multiple OBJ files. ↑ Shape Fusion List of Scans http://www.david­3d.com/en/support/david5/print­version...
  • Page 29 In the list individual scans can be made visible / invisible by click on Supported file formats for import / export: DAVIDMESH Proprietary DAVID file format. All mesh data is saved. Default for projects. Import / Export 3D object file format from Wavefront Technologies. Some meta data is Import / lost in export.
  • Page 30 10/31/2016 DAVID ­ DAVID 5 Manual Scans may contain some surface parts that you want to remove. You can do this by the following procedure: 1. Select parts of the surface with the tool. Select Triangles 2. You can invert your selection by clicking on Invert Selection...
  • Page 31 Contact Pair Selection help DAVID by clicking on distinctive points that are to be aligned with each other (e.g., tip of the nose). Relevant here is the area within the red circle at the mouse pointer. If you would like to define the contact pair points very precisely, zoom up close with the mouse wheel before you click.
  • Page 32 10/31/2016 DAVID ­ DAVID 5 Manual In case you know the rotation angle and/or the direction of the rotation axis, you can provide these information within the alignment mode Around Axis After a few registration steps, it may be helpful to group two or more aligned scans temporarily. Simply...
  • Page 33 10/31/2016 DAVID ­ DAVID 5 Manual Shape Fusion Fusion ↑ Make all scans visible , which you want to fuse. Invisible scans will not be included in the fusion. First, try a small value. High values cause to very long computing time and higher memory Resolution usage.
  • Page 34 10/31/2016 DAVID ­ DAVID 5 Manual Fusion result (with "close holes" option) ↑ Shape Fusion A-B Distances "A-B Distances" allows to measure distance values between two surface points: 1. Click on ) under "A-B Distances". Add Distance 2. Click with left mouse button on any surface within 3D window for point A.
  • Page 35 1. Select a scan and set it as Test Object 2. Select a scan and set it as Reference Object 3. Enter the desired Tolerance [mm] 4. Click on Compare 5. Add data tips on the reference scan with Add Reference Marker ↑ 3D Viewer Introduction Installation Setup Calibration...

  • Page 36: Select Objects

    10/31/2016 DAVID ­ DAVID 5 Manual 3D Navigation You can move around your scans in 3D by mouse: Left Mouse Button Down + Mouse Move Move the view. Mouse Wheel Zoom in/out. Right Mouse Button Down + Mouse Move Inside white circle: Rotate the view around vertical and horizontal axis. Outside white circle: Rotate the view around view direction.

  • Page 37: Keyboard Shortcuts

    10/31/2016 DAVID ­ DAVID 5 Manual Shift + Right Mouse Button Inside white circle: Rotate the scan around vertical and horizontal axis. Outside white circle: Rotate the scan around view direction. Keyboard Shortcuts Shortcut Auto adjust camera view to all objects or selected objects. Show coordinate systems on/off.

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