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10/31/2016

DAVID DAVID 4 Manual

http://www.david3d.com/en/support/david4/printversion

11/38

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.

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Summary of Contents for 4

Page 1: ...on 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 ...

Page 2: ... 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 ...

Page 3: ...n 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 ...

Page 4: ... 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 DAVID SLS X 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 ...

Page 5: ...ctor 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...

Page 6: ...he 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...

Page 7: ...ed 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...

Page 8: ...ws 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 diag...

Page 9: ...om en support david4 print version 9 38 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 ...

Page 10: ...can 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 siz...

Page 11: ...ll 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: ...an 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 Setup Camera Setup Select your camera under Setup Camera Setup This automatically sets recommended values for important properties e g Gain See ...

Page 13: ...Setup Setting up the projector as Extended Desktop in Windows Click the right mouse button on a blank area of your Windows desktop select Screen resolution or Properties depending on your Windows version In this window you can separately configure your two Displays the monitor and the projector Image may vary ...

Page 14: ...ct your monitor and projector will show the same desktop wallpaper but otherwise different contents You can move your mouse pointer sideways between the monitor and the projector image The Windows Start menu and most of the desktop icons are only displayed on the monitor Any window can be moved between monitor and projector back and forth So in case the main DAVID window is displayed on the projec...

Page 15: ...esign of the DAVID 4 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 pair of glass calibration panels is used as a reference object whose dimensions are precisely known 1 Se...

Page 16: ... Put one fixing bracket flat on the used surface e g a table Insert the glass calibration panels in the fixing bracket Finally attach the second fixing bracket on the glass calibration panels For starters the pattern should be folded inwards Advanced users can avoid undesired reflections with an outwardly folded pattern if necessary Fix the glass calibration panels using the two fixing brackets to...

Page 17: ... 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 3 Move scanner in position Typical setup for calibration Remove the object and set up the glass calibration panels and the scanner in front of each other about the same distance as the object previously so that the projection and c...

Page 18: ...e visible The entire camera image should be filled with about 15 to 70 calibration markers the camera should not be able to look aside the glass calibration panels You can achieve this by moving the scanner and tilting or adjusting the tripod but you should not change anything above the red base rail 4 Enter correct scale Typical setup for calibration Enter the correct scale length in the Calibrat...

Page 19: ...oftware first measures the position orientation focal length and distortion characteristics of the camera Then a pattern sequence is projected in order to measure the same optical characteristics of the projector If texturing is not turned off finally a white balance is performed After successful calibration a checkerboard pattern is projected the corners of which should fall exactly into the cali...

Page 20: ...on process must be repeated Scanning Introduction Installation Setup Calibration Scanning Turntable Control Camera Control Projector Control Pattern Parameters SL Scanning Result Filtering Result Transfer Texturing Shape Fusion 3D Viewer The Scanning menu provides functions to setup scan parameters capture new scans including texture filtering exporting and sending them to Shape Fusion In the foll...

Page 21: ...ect pattern parameter profile Select the pattern parameter profile Quality Default recommended or Speed This setting affects scan quality and scan time See also Pattern Parameters 3 Click Start With each click on Start a new scan is generated A sequence of patterns is successively projected and recorded This can take between settings 2 4 seconds or longer See also SL Scanning for scan options Usin...

Page 22: ...vate a DAVID turntable Pro Edition or your own turntable via plugin interface Enterprise Edition The initialization may take a few seconds You can set the Number of Scans that are automatically executed when you click on Start under Scanning When you have activated Auto Align to List and Auto Align to Previous every new scan will be automatically aligned to the last scan of the sequence using the ...

Page 23: ...0s otherwise the camera image will flicker pulsate when looking at the projection Increase exposure in multiple of projector frame rate e g to 1 30 only in cases when your object is too dark Camera properties are handled and stored for scanning and texturing separately Scanning Projector Control With Projector Brightness you can reduce the maximum projector brightness digitally The default value i...

Page 24: ... be used when speed is very important Default Medium scan time Good compromise between speed and quality Quality Maximum scan time Robustnesss and accuracy is improved There is also a Custom mode that let s you set the scan parameters to your requirements Scanning SL Scanning Click on button Start to make a new single scan or multiple scans in case of activated turntable There are some options tha...

Page 25: ...y However we recommend not to do this set filters to 0 If your scans are noisy or wavy you should rather optimize the scanning conditions brightness settings room conditions More smoothing options are available in the Shape Fusion menu later on Quality Check The filter Quality Check removes scan data that are likely to be inaccurate This is possibly on the edge of the scan or at transitions betwee...

Page 26: ...an list button Add to List After each click on Add to List you can align the new scan immediately to the previous scans Shape Fusion menu see next chapter Alternatively you can first create further scans in the Scanning menu collect them in the list and align them all later If the settings are optimized and you do a lot of scans in a row you can accelerate the workflow with the Auto Add to List an...

Page 27: ...e following scans you will not have to go to the menu Texturing each time instead you can activate the Auto Grab Texture option in the Scanning menu Texturing White Balancing Whenever you change the texture settings you should re perform the white balancing That means DAVID calibrates color transmission characteristics of the entire system projector camera in order to be able to measure the colors...

Page 28: ...Scanning Texturing Shape Fusion Project List of Scans Cleaning Alignment Fusion A B Distances Comparison 3D Viewer The Shape Fusion menu provides functions to clean align fuse merge several scans into a single 360 model compare scans and measure distances The fused object subsequently can be exported to various formats to be used e g for 3D printing ...

Page 29: ...should be the preferred method to save your data in DAVID 4 It is much faster and easier than using multiple OBJ files Shape Fusion List of Scans In general the individual scans are collected via the Add to List button during scanning You can import more scans into the List of Scans either by drag and drop from the Explorer or using the icon below the list In the list individual scans can be made ...

Page 30: ... selected scans shows up a context menu with various options Use button Scan Properties on selected scans to get additional information like triangle count vertex count pose surface area volume and more Shape Fusion Cleaning 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 Select Triangles tool 2 You can ...

Page 31: ...e 1D and Arrange 2D under Alignment you can arrange all scans side by side to get a good overview 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 ...

Page 32: ...nt 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 con...

Page 33: ... group click with the right mouse button on the entry in the list and select Uncombine scans Scans after alignment 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 Resolution value High values cause to very long computing time and higher memory usage ...

Page 34: ...t Feel free to try it depending on the object Click on Fuse to start the fusion process This is a computationally intensive process and will take a few seconds to several minutes The visible scans are merged to form a closed triangle mesh holes are optionally closed smaller artifacts are removed and if the scans have textures a common texture is generated Finally you can export your fused 3D objec...

Page 35: ...lick with left mouse button on any surface within 3D window for point A 3 Click with left mouse button on any surface within 3D window for point B Shape Fusion Comparison Comparison allows to measure signed distances between two surfaces 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 th...

Page 36: ...orthogonal to the viewing direction The amount of translation is proportional to the distance between the virtual camera and the Orbit Center Mouse Wheel Translation of the virtual camera along the viewing direction The amount of translation is proportional to the distance between the virtual camera and the Orbit Center Right Mouse Button Down Mouse Move Inside white circle The virtual camera is r...

Page 37: ...ject you want to select For multi selection hold Ctrl down To deselect all objects click on the background Move Selected Object Just select a scan then keep the Shift key pressed The manipulation is similar to the 3D navigation with the left and right mouse button Shift Left Mouse Button Move translate scan under mouse pointer Shift Right Mouse Button Inside white circle Rotate the scan around ver...

Page 38: ...nt version 38 38 E Show triangle edges on off P Toggle polygon mode between Solid Lines or Points T Show textures on off N Show vertex normals on off These are the shortcuts for the 3D viewer only There are other function specific shortcuts which are displayed in the tooltips ...

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