QUICK GUIDE
Contents 1. Introduction 1.1. Intended Purpose 1.2. Safety Instructions 1.3. Scope of Delivery 1.4. System Requirements 27 27 27 28 28 2. Initial Setup 2.1. Position of the Camera 2.2. Rotation of the Camera 2.3. Connection 2.4. Installing the Camera Driver 2.5. Setting up the Projector 2.6. Setting up the Projector as Extended Desktop in Windows 29 29 29 30 30 31 31 3. The Scan Software DAVID 3.1. Software Updates 32 32 4. Setup and Calibration of the Scanner 4.1. Menu ”Hardware Configuration“ 4.2.
1. Introduction Thank you for choosing a DAVID product! In order to setup and run your 3D scanner safely, please read the following safety instructions. This manual is part of this product. In case of passing this product, please enclose this guide. 1.1. Intended Purpose With your DAVID SLS-2 Structured-Light Scanner, you can quickly and accurately capture object surfaces three-dimensionally. 1.2. Safety Instructions Place the appliance on a stable surface.
The projector‘s power adapter is equipped with a three-wire grounded plug. The plug only fits in a grounded power outlet. Make sure that the power outlet is properly grounded before inserting the AC adapter plug. Do not insert the plug into a non-grounded socket. Please contact your electrician for details. Warnings! The grounding pin is a safety feature. Using a not properly grounded socket may result in electric shock and/or injury. Do not make any changes to any components.
2. Initial Setup 2.1. 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 to the left of the projector 110 to 350 mm optional, better to the left from 350 mm to the right of the projector If necessary, mount the camera slide to the corresponding side. The exact position of the slide (distance from the projector) is set later in operation.
TIP: 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. Large camera angles are usually impractical and reduce the depth of the measurement range. 2.3.
2.5. Setting up the Projector The projector is already delivered with optimal settings, we recommend not to change anything in the menu. Note: You can restore the recommended settings in the projector‘s menu at any time as follows (See Figure 2.4.) 1 Select ”Reset“ 2 Turn the ”Auto Keystone ” off, and set the manual value ”Manual Keystone“ to 0 3 As ”Projection Location“, select the icon for desktop use, not ”AUTO“ Figure 2.
Your screen should be set as ”primary monitor“. Make sure the projector (usually ”Acer K132“) 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. The resolution of the projector must be set to its native value (usually 1280 * 800 pixels) Furthermore, you should make sure the projector is set to 60 Hz.
4. Setup and Calibration of the Scanner An advantage of the modular design of the SLS-2 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° pair of glass calibration panels is used as a reference object, whose dimensions are precisely known. 4.1.
C B A Figure 4.2: Adjusting rings (A) aperture and (B) focus, (C) fixing screws 9 Camera brightness/aperture: The ”Projector Brightness“ slider in the software should be set to maximum. You should only reduce it if a clean modulation is not possible in the following. Adjust the mechanical aperture (dial A). Consider only those areas in the camera image which show the regular waves! The displayed intensity curves (red) must be sinusoidal and may neither be undersaturated nor oversaturated, i.e.
10 Fasten all screws (projector, camera and camera slide), so that nothing can be displaced from now on. The camera lens dials can be fixed with their locking screws (C). The scanner is now optimized for your object (size of the scanning area, working distance, brightness of the object) and must be calibrated like this. 4.2. Menu ”Calibration“: Calibration of Camera and Projector 1. Now set up the calibration corner. You will need both 90° fixing brackets and the glass calibration panels.
4. Enter the correct scale length in the ”scale [mm]“ field. You can find it on the edge of the selected calibration pattern. (30, 60, 120, or 240 - see Figure 4.10) 5, Check the camera image: In the areas where the waves are visible, the red intensity curves must not reach the blue lines. If the object to be scanned is considerably darker than the white glass calibration panels, the sine waves will now be overdriven. Correct this by temporarily reducing the ”Projector Brightness“ slider in the software.
5. 3D Scanning 5.1. Menu ”Structured Light“: Z 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.
Figure 5.3: Display of the scan result in 3D Z If you activate ”Auto. Grab Texture“, a color texture will be recorded with each scan. If the texture is too bright or too dark, you can adjust its settings in the ”Texturing“ menu (see next sub-chapter). You can toggle the visibility of the texture in the 3D view using the appropriate button under ”Visibility“. Z Using the mouse, you can rotate the 3D view (right mouse button), move (left mouse button) and zoom (mouse wheel).
5.2. Menu ”Texturing“: You can grab a color texture with each scan. Because of the monochrome camera of the SLS-2, the color texture of the object will be determined by measuring the reflective properties. Therefor the projector pictures different colors on the object surface. DAVID is able to interpret the reflections and converts them into a real color texture. For the texture grabbing, different lighting conditions may be ideal.
6. Alignment and Fusion of Multiple Scans 6.1. Menu ”Shape Fusion“ This menu provides functions to 1. align and 2. fuse/merge several scans into a single 360° model. The fused object subsequently can be exported to various formats, to be used e.g. for 3D printing. In the following, we will describe the general case how to fuse variously positioned scans. Notes on special cases and more detailed information can be found on http://www.david-3d.com/manual 6.2. Alignment of Multiple Scans Figure 6.
Z DAVID offers several alignment modes. First, start with the alignment mode ”Free“, which allows you to align arbitrarily positioned scans one-on-one. In order for the automatic mode to align two scans successfully, the two scans must have a unique region of overlap in common, which must not be too small. With start the alignment. In the 3D view, first click on the object A to be aligned. Then click on the object B, to which A should be aligned. In Figure 6.
Z If the automatic alignment finds false solutions, you should activate ”Contact Pair Selection“ . Then you can 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. If you want to mark the contact area only roughly, zoom out before you click.
7. Disposal / Recycling The electronic components of the DAVID 3D scanner, including disused batteries or accumulators, may not be disposed of as household waste. Every consumer has a statutory obligation to properly dispose of these items at officially designated points of disposal. In accordance with the EU Directive 2002/96/ EC on waste electrical and electronic equipment this must be disposed of in accordance with local regulations.
8. Troubleshooting 8.1. Problems with the Scan Quality Problem Cause / Solutions The scans are noisy (rough surfaces) Adjust the camera aperture (f-stop) so that the red intensity curves are welladjusted and not being cropped. (*) Set the projector‘s brightness to maximum. Increase the camera angle (at least 20°) and the distance between the camera and projector. (*) Set the value ”Gain“ in the camera properties to minimum (*) Select pattern parameter ”Default“ or better ”Quality“.
8.1. Problems with the Scan Quality Problem Cause / Solutions The scans are smooth / fine details are missing The shorter the distance between the scanner and the object, the more detailed are the scans. Set up the scanner at the smallest possible working distance, so that the scan size is just sufficient. Make sure that the distance between scanner and object is the same as during the calibration. Make sure that both, projector and camera, are well focused on the scanned object.
8.2. Problems with Alignment / Fusion Problem Cause / Solutions Shape Fusion: The scans are aligned completely wrong DAVID aligns the scans such that the overlapping areas are maximized. That maybe causes wrong solutions if there are more than one matching overlapping areas. Start the alignment again. The algorithm is in part randomized and therefore it can find another solution next time. Use the ”Contact Pair Selection“ to define by mouse a pair of regions which are supposed to overlap.
8.3. Weitere Probleme und Lösungen Problem Cause / Solutions The exported 3D model has an incorrect scaling During calibration, make sure you have entered the correct scale value of the calibration pattern. (*) The unit of the 3D data corresponds to the unit of scale value (usually mm). The resolution / file size of the exported data is too high Fuse the scans with a lower value in the ”Resolution“. But try not to re-import and fuse your Fusion result again, instead fuse the original aligned scans.
9. Warranty Terms This device was manufactured using the latest production methods and has been carefully inspected. All DAVID 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.
11. CE Declaration of Conformity DAVID Vision Systems GmbH Rudolf-Diesel-Str.
http://www.david-3d.com BIBUS SK, s.r.o Trnavská 31, SK-94 901 Nitra Tel.: 037/ 7777 911 Fax.: 037/ 7777 999 Email: 3d@bibus.sk http://www.bibus.
