DAVID 4 User manual
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Introduction
Installation
Setup
Connections
Camera Positioning
Camera Setup
Projector Setup
Calibration
Scanning
Turntable Control
Camera Control
Projector Control
Pattern Parameters
SL Scanning
Result Filtering
Result Transfer
Texturing
White Balancing
Shape Fusion
Project
List of Scans
Cleaning
Alignment
Fusion
A-B Distances
Comparison
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3D Viewer
↑ | Introduction
Introduction
Installation
Setup
Calibration
Scanning
Texturing
Shape Fusion
3D Viewer
Welcome
Welcome to the DAVID 3D Scanner 4 documentation. DAVID 4 is a complete solution for generating a
watertight 3D surface model of a real world object.
Videos
Before further reading you should watch our tutorial videos first:
1. SLS-2 Tutorial 1 Installation
2. SLS-2 Tutorial 2 Setup
3. SLS-2 Tutorial 3 Calibration
4. SLS-2 Tutorial 4 Scanning Texturing
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↑ | Installation
Introduction
Installation
Setup
Calibration
Scanning
Texturing
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).
3. Choose "Full installation" as profile.
4. Follow the instructions on the screen.
You can download a trial / current version under Downloads.
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↑ | Setup
Introduction
Installation
Setup
Connections
Camera Positioning
Camera Setup
Projector Setup
Calibration
Scanning
Texturing
Shape Fusion
3D Viewer
After successfully connecting all devices, you typically walk through the following steps:
1. Main setting
Select DAVIDSLS‐X as "Setup Type".
2. Screen ID
Here you can select on which display device the stripe pattern is shown. Set the ScreenID so that the
pattern is projected from the projector.
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3. Working distance
Setup of the object and arrangement of the projector and camera
Place the scanner in front of the object to be scanned and aim the projector so that it illuminates the
surface to be scanned - not less, but also not much more.
4. Projector focus
Adjust the focus of the projector with the focus lever, so that the stripes are perfectly focused on the
object surface.
5. Selection of camera
Under "Camera Setup", select your camera (e.g. DAVID-CAM-3.1-M). The live image from the camera is
displayed. If necessary, set the mechanical aperture and focus so that you get a picture.
6. Position of the camera
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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).
7. Exposure time
The Exposure should be set to the same value as the frame rate of the projector (usually 1/60s), otherwise
the camera image will flicker / pulsate when looking at the projection. In this case adjust the exposure
time.
8. Camera focus
Adjusting rings (A) aperture and (B) focus, (C) fixing screws
Adjust the aperture of the camera (dial A) so that you will get a rather bright picture. Look at the camera
image and watch the sharpness of the object and the sharpness of the projected black and white stripes
(cross). Adjust the focus of the camera (dial B) so that the object is depicted as sharp as possible.
9. Camera brightness / aperture
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Typical live image with good setup and settings
The ProjectorBrightness 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. the red sine curve (see figures)
should not be cropped at the blue lines.
If the curves are strongly flattened in the dark area (bottom or left) without being close to the lower blue
lines, the ambient light may be too strong. In this case please darken the room.
The aperture dial (A) on the camera has a scale (f-stop from 16 to 1.4). Even for very bright conditions
(small objects), please avoid setting f-stop higher than 16, otherwise you will lose sharpness. If
necessary, better reduce the value ProjectorBrightness in the software.
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Left: Too dark
→
open aperture further; Middle: Well-controlled sine wave almost reaching the blue borders;
Right: Too bright, sine is cut-off (overdriven)
→
close the aperture somewhat
10. Fasten screws
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.
↑ | 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.
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Connection diagram
If you want to change the video source (e.g. HDMI to VGA), follow these instructions:
1. Press Source key ( ↑ key) on projector.
2. Select desired video source using ↑ and ↓ keys.
3. Press → key to confirm selection.
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↑ | 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 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. The distance between the camera and projector optics will be
similar to the size of the object / region to be scanned.
Table of contents
Other DAVID Scanner manuals
