DAVID SLS-1 Getting Started Guide Version 3.7 DAVID Vision Systems GmbH Rudolf-Diesel-Str. 2a D-56070 Koblenz Germany Phone: +49(0)261 983 497-70 Fax: +49(0)261 983 497-77 Mail: service@david-vision-systems.de Web: www.david-laserscanner.
DAVID SLS-1 Contents of Package • SL Scanner pre-mounted, consisting of • Video projector • Camera with focusable lens • Mounting rack with ball joint (for camera) • Tripod with protective bag • 2 calibration panels with 2 mounting tracks 90° • USB drive with DAVID-Laserscanner Pro Edition and camera drivers • Accessories for projector • External wall power supply • Remote control • VGA cable • HDMI cable • 2 AV cables (not required for scanner) • Protective bag • User Manual • Adapter set for global power
Preparation object size s Setup Before connecting the devices, adapt the whole scanner setup to the size of the object or surface region you want to scan. The intersection angle between projection and camera view should be around 15°-25° (max. 10°-35°).
Installation Connect all components as depicted below: USB VGA / HDMI Installation of the Camera Drivers Even if Windows automatically installs drivers, we recommend to install the included drivers: 1. Plug the USB drive into your PC, then choose “Open” resp. “Explorer”. 2. Launch “Install_SLS-1_Camera_Driver“ (may require administrator rights). 3. Follow the instructions on screen. Projector Settings The projector is shipped with optimal settings.
Setup Projector as Extended Desktop in Windows With your right mouse button, click on a free space on your Windows desktop. Choose “Resolution” or “Properties” (depending on your Windows version). In this dialogue window, you can separately change the settings of your two displays, monitor and projector. Your monitor should be set as “main display”. Set the projector to be an extended desktop (“extend these displays” / “extend desktop to this display”).
Scanning with DAVID Launch DAVID by starting “Start_DAVID3“ on your DAVID USB key. On the left side you can see the expandable main menus. Each menu is dedicated to one of the following work steps, which you will usually walk through from top to bottom. For the individual work steps, usually the same camera and projector settings are suitable. However it is possible to define different settings in each step.
5. Below “Camera”, select your camera (DAVID-CAM-3-M). You will see the live view. If necessary, roughly adjust the camera's mechanic aperture and focus ring. 6. Aim the camera so that it can see the projected pattern on the object. Then fix the ball joint. If the camera view and/or projector beam obtains much more than the scanned surface, you should reduce the distance between scanner and object (step 3). 7.
2. Menu “Calibration“ 1. Select a calibration pattern size which fits to the object (see table on page 3). Set up the calibration corner at precisely 90°, using the mounting tracks. For starters, the pattern should be flapped to the inside, while advanced users may be able to reduce reflections with a concave corner setup. 2. Remove the object and set up the scanner and the calibration corner in front of each other, with approx. the same distance as the object before.
5. Click “Calibrate” in order to calibrate the whole scanner. In this step the software will first measures the position, orientation, focal length and distortion coefficients of the camera. Then it will project a pattern sequence in order to determine the same optical properties of the projector. If Texturing is not switched off, it will also project different colors to perform a white balance measurement.
3D Scanning Menu “Structured Light“ • Place scanner and object in front of each other, at the same distance like you did during calibration. If the distance is too different, the projected stripes and camera image will be out of focus. A slightly unsharp pattern projection is even desirable, but the camera should be perfectly focused. If necessary, correct the distance between object and scanner, but do not adjust the focus rings.
• If you check the “Auto. grab texture” option, DAVID will record a texture with each scan. If the texture is too bright or too dark, you can adjust the texture settings in the Texturing menu (see below). With the corresponding Visibility button at the top bar, you can choose whether the texture will be shown in the 3D view. • With your mouse, you can rotate, move and zoom the 3D view. • The scans need to overlap sufficiently so that they can be combined/aligned later on.
Alignment and Fusion of Multiple Scans Menu “Shape Fusion“ This menu offers 1. to align several scans to each other and 2. to fuse them into one closed 360° model. You can export the fused object in various file formats and use it e.g. for 3D printing. In the following we describe the general case of aligning scans from arbitrary perspectives. Hints about special cases and more detailed information can be found in the online manual on www.david-laserscanner.com. 1.
• Scans after Alignment Fusion Result (with “Close Holes”) • Hint: All scan movements can be undone separately with the “Undo” button . • Hint: In case the automatic alignment does not find the right solution, you should activate “Contact Pair Selection”. Subsequently you can help DAVID: When you click on the scans you want to align, click precise at distinctive surface areas (e.g. tip of the nose) which are supposed to be in contact. The size of the red circle next to the mouse pointer is relevant.
Terms of Warranty This device was manufactured using the latest production methods and has been carefully inspected. All DAVID Laserscanner® products are subjected to rigorous quality control. If this device nevertheless fails to perform faultlessly, this is something we regret and we ask you to consult your supplier. The following conditions apply to warranty claims: This warranty is valid for a period of 24 months from the day of purchase.
