Standard zoom and wide-angle lenses exhibit significant distortion of the image. Straight lines at the edges of the image can appear curved. Lens distortion effects can impact on the accuracy of the modelling process.
3DSOM Pro provides a Lens Calibration Wizard to allow the user to take additional photos for automatically calibrating the lens. Once the lens has been calibrated, new photos will be automatically undistorted when they are loaded from disc.
Launch the Lens Calibration Wizard using the Lens Calibration Wizard Window is opened choose the first option, "New calibration", to calibrate from photos. Then click the button to proceed to the next page of the wizard. menu item. When the
The first step is to print out the lens calibration grid (a regular grid of dots) onto a plain sheet of white paper. Hit the button to open the print dialog.
Ideally, you should try to print out a lens calibration grid roughly the same size as a typical object you will be modelling. That way you can take photos of the grid at a similar distance to images you will take of your objects. However this is not essential.
To calibrate a zoom lens you need to take front-on shots of the grid at a range of zoom settings. Note that if your camera does not export JPEG images with EXIF tags you will need to fix the zoom setting for all photos and treat as a fixed focal length camera.
General points to note...
You can save the calibration data for future projects using the "Load existing calibration settings" option when the wizard is launched. button. To reload a calibration you can use the
Check the "Use as the default calibration for all new projects" to use the saved calibration as the default for all new projects on your PC. 3DSOM Pro will automatically load this calibration file when you launch the software or start a new project.
Hit the button to continue with your project. Imported photos (using the button or the menu item) will now be lens corrected using the results of calibration.
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