After successfully connecting all devices, you typically walk through the following steps:

1. Main setting

Select DAVID SLS-1 as "Setup Type".

2. Screen ID

Here you can select on which display device the stripe pattern is shown. Set the Screen ID so that the pattern is projected from the projector.

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

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

Typical live image with good setup and settings

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. 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 Projector Brightness in the software.

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.

Next Topics

Camera Setup
Setup of camera
Projector Setup
Setup projector in Windows and DAVID