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Inadequate Exposure or Missing Points

Last Updated: Oct 09, 2015 05:21PM EDT
Objects that have stark, contrasting colors necessitate different camera exposures and might prove difficult during automatic “tuning.” Tuning is the process by which the software determines the best camera exposure for capturing the color of the object and the best exposure for capturing where the laser is hitting the object.  
 
Repositioning the object on the turntable so the camera can tune to a different side of the object might resolve this problem. A second option is to utilize the “High Contrast Scanning” function under the Advanced Scanning menu.
 
Some objects that have intertwined high constrasting colors can’t be scanned with one exposure. Dual exposure will yield impressively better results. Spending a few extra minutes manually setting the exposures for objects with stark color contrasts will likely lead to complete point clouds and watertight meshes. See High Contrast Scanning for more details.
 
In the following example, an attempt to scan an apple with a very light spot near the stem proved very difficult using automatic tuning.
 
Bad Exposure
Point Cloud PLY File Format
 
Note the area of the apple where the color was light wasn’t captured at all.
Bad Exposure Final Outcome
Meshed OBJ File Format
 
Note where the missing data led to the apple looking like a bite was taken from it.
 
 
Proper Exposure
Point Cloud PLY File Format
 
Note the light spot on the apple has been captured.
Proper Exposure Final Outcome
Meshed OBJ File Format
 
Final mesh has better color and more accurate surface detail overall.


Related Articles:
Bad Lighting
Calibration Troubleshooting
Errant Points and/or Background Noise
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