[DAVID/HP] Capture Scans

Scan Object

1. After the calibration is successfully done, the scanner is ready to perform a scan. Remove the calibration panel and place the object back to its original position. Make sure the working distance is the same as that which was used during setup and calibration. Do Not change the focus of the camera nor of the projector. NOTE: using an incorrect working distance will result in blurred camera image and projected stripes, compromising the quality of the scan.
   
   
2. Before each scan, make sure the red sine curves are not cropped/overdriven in the ares where the wave pattern is visible. If adjustment is necessary, adjust the “Project Brightness” in the software.
   
   
3. In the DAVID software, go to Structure Light panel, select, Pattern Parameters: “Quality, “Default” (recommended), or “Speed”
   
   
   
4. Click “Start” to obtain a scan of the projected light pattern. Once the scan is done, click “Add Scan to List of Scans for Shape Fusion” to save the scan to the “List of Scans”. Note: "Add to List" only stores the scan to the "List of Scans". It does NOT save the scans to your computer. If the program crashes during fusion or scanning process, all scans on the list will be lost.
   
   
   
5. It will require about 6-8 scans around the object and couple more of the top and bottom to capture the entire object. Make sure to scan the object from different angles to get all aspects of it. Delete any redundant scans of lower quality.
   In order for the scans to align properly in the next step of the process, it is important to systematically scan the object. Make sure the view captured by each scan overlaps with those of other scans. 
   
   
6. When you have completed capturing the scans. Make sure all desired scans on the "List of Scans" are saved to a permanent location. (Such as your personal USB Flash Drive, your dropbox account, or another location under your control. This computer will lose all saved information upon reboot.)
   
   

Preparing Dark or Reflective Objects

Even with optimal settings, dark or reflective objects will be difficult to scan. This happens because dark objects tend to absorb most of the light patterns, and reflective objects distort the light patterns. It is recommended to prepare the object for scanning by applying baby powder or starch to brighten and matte out the object. Baby powder can be found in the 3D scanning station.