PhaseOne Camera Calibration with Aerial Datasets
Since PhaseOne imagery requires pre-processing steps, which are outlined here: , the imagery within Spatial Explorer will already have the lens distortion corrected in the resulting JPEGs. Because of this, it is important to DISABLE Lens Distortion whenever conducting a camera calibration with PhaseOne imagery.
Inspect the JPEGs output from IXCapture to ensure there are no areas of 'no-value' in the images (showing as a black wedge near the edge of frame). If areas of no-value are seen in the undistorted JPEG output from IXCapture, a receptor mask will need to be created to remove this section of each frame from the calibration and colorization steps. The process to create a mask is outlined here: .
As with other aerial datasets, Individual Pose Correction (Orientation) is typically the most important feature to calibrate. All LiDAR systems are calibrated prior to leaving our production facility, and unless the camera has been physically removed from the system it's likely that the factory calibration for mounting rotations and receptor intrinsics is still valid.
The orientation of each image is determined by the trajectory, and the trajectory always has a degree of error. Individual Pose Correction (Orientation) uses features detected in imagery to adjust the orientation of each image, resulting in improved colorization and more accurate camera poses (which can then be exported and used in third party photogrammetry software).
If colorization errors are apparent after photo pose correction, it may be advisable to calibrate the Sensor Orientation, as factory camera calibrations can be degraded by mishandling, shipping and normal use over time. Again, with PhaseOne imagery converted using IXCapture, Lens Distortion should NOT be calibrated in Spatial Explorer.
Last updated
