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42

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.

Z

 After a few registration steps, it may be helpful to group two or more aligned scans temporarily. 

Simply select two or more scans in the ”List of Scans“ (check the checkboxes of the respective scans), 
click with the right mouse button and select 

”Combine selected scans”

. This allows you to group 

scans (temporarily) and use them as if they were a single scan. In our example (Büssing bust, Figure 6.2) 
we could combine scans 1 and 4 just before the alignment of the 5th. In this way, the 5th scan will be 
aligned simultaneously to both, which can lead to more overlap and thus better results. To un-group, 
click with the right mouse button on the entry in the list and select 

”Uncombine scans”

.

6.3. Fusion of Multiple Scans

Z

 Make all scans visible  

 , which you want to fuse. Invisible scans will not be included in the fusion.

Z

 First, try a small 

”resolution“ 

value. High values cause to very long computing time and higher 

memory usage.

Z

 The 

”refinement“

 option in some cases can improve the accuracy and sharpness, but it often 

causes distortions. Feel free to try it, depending on the object.

Z

 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. For example see Figure 6.5.

Z

 Finally, you can export your fused 3D object into an OBJ, STL or PLY file by using the 

”Save“ 

button.

Summary of Contents for SLS-2

Page 1: ...QUICK GUIDE...

Page 2: ...etup and Calibration of the Scanner 4 1 Menu Hardware Configuration 4 2 Menu Calibration 5 3D Scanning 5 1 Menu Structured Light 5 2 Menu Texturing 6 Alignment and Fusion of Multiple Scans 6 1 Menu Sh...

Page 3: ...Do not operate the device in potentially explosive atmospheres Never look directly into the projector lens when the lamp is turned on The bright light may cause serious damage to eyes Do not face the...

Page 4: ...tions of the projector manufacturer These can be found separately on the accompanying ACER projector CD 1 3 Scope of Delivery Structured Light Scanner pre assembled consisting of LED video projector C...

Page 5: ...operation The distance between the camera and projector optics will be similar to the size of the object region to be scanned 2 2 Rotation of the Camera Rotate the camera by about 22 such that it aims...

Page 6: ...duce the depth of the measurement range 2 3 Connection Connect the camera the projector and the DAVID USB flash drive according to the wiring diagram to your computer Fig 2 3 To connect the projector...

Page 7: ...tor 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...

Page 8: ...enu 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 projector...

Page 9: ...e 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 select your camera DAVID CAM 3 1 M The live image from...

Page 10: ...ust 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 no...

Page 11: ...e size fits to the scanned object The pattern should be slightly larger than the object region to be scanned Fig 4 8 For object sizes above ca 200 mm use the large 240 mm pattern on the back For start...

Page 12: ...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 i...

Page 13: ...can please check that the red sine curves are not cropped overdriven relevant only in the areas where the wave pattern is visible If adjustment is necessary adjust the Projector Brightness in the soft...

Page 14: ...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...

Page 15: ...necessary it is advisable not to use the projector as a light source Projector Brightness to 0 but to provide diffuse ambient light in the room In that case of course the monochrome camera can only g...

Page 16: ...nformation can be found on http www david 3d com manual 6 2 Alignment of Multiple Scans Z In general the individual scans are collected via the Add to List button during scanning You can import more s...

Page 17: ...ill be aligned to the green one Successively align more scans to the already aligned scans Always choose pairs that have as much overlap common areas as possible In the above example the next step wou...

Page 18: ...1 and 4 just before the alignment of the 5th In this way the 5th scan will be aligned simultaneously to both which can lead to more overlap and thus better results To un group click with the right mou...

Page 19: ...accordance with local regu lations You can dispose of the product at your local public point for collection of electronic waste You can also return the product to us for disposal In that case please...

Page 20: ...g light sources During the scan nothing is allowed to move scanner object A scanned per son should lean against sth as comfortably as possible and hold their breath Increase the camera angle at least...

Page 21: ...ke 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 On shiny objects reflections...

Page 22: ...there is the more likely the correct alignment is found If the object has color transitions or markings take a texture with each scan and activate Use Texture when aligning If you have rotated the obj...

Page 23: ...and fuse your Fusion result again instead fuse the original aligned scans Import your Fusion result into the List of Scans click the entry with your right mouse button and select Reduce mesh density T...

Page 24: ...h reimbursement of the purchase price After the warranty period has expired you still have the option of sending the defective device to your supplier or to the DAVID after sales service for repair Re...

Page 25: ...24 2010 EN 61000 3 2 2006 A1 2009 A2 2009 Class A EN 61000 3 3 2008 Camera EN 61000 6 3 06 2005 Class B EN 55022 09 2003 IEC CRISPR 22 EN 61000 6 2 08 2002 Class A EN 61000 4 2 12 2001 EN 61000 4 3 11...

Page 26: ...http www david 3d com BIBUS SK s r o Trnavsk 31 SK 94 901 Nitra Tel 037 7777 911 Fax 037 7777 999 Email 3d bibus sk http www bibus sk...

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