Geometric Calibration
Geometric calibration aligns the camera and image with world coordinates and corrects distortion introduced by the camera and lens. This process is crucial for:
Enables measurements in world units directly from imagery
Removal lens distortion and providing accurate scale
Facilitating stereo imaging applications
I2R delivers comprehensive geometric calibration services, providing customers with:
Intrinsic calibration parameters, including:
Focal length
Principal point
Radial and tangential distortion coefficients
These parameters are essential for correcting distortion and ensuring precise image geometry. Both laboratory and in-flight calibrations are available.
Our state-of-the-art calibration process ensures optimal image quality and accuracy across various applications, from scientific research to industrial imaging. Methods include computer vision checkerboard, coded targets, Structure from Motion (SfM) and star fields. Star fields are used for long focal length optical systems.
Total Distortion
Radial Distortion
Tangential Distortion
In-flight Geopositional Assessment
I2R measures geometric accuracy of a system in-flight using comparisons to reference images or ground control points (GCP). Reference image comparisons are performed against data with known accuracy, including USGS DOQQs (1 m data over US with 7.6 m CE95) or NAIP imagery (1 m data over US with 1 m CE90).
For higher resolution accuracy, comparisons can be made to GCPs. I2R surveyed ground control points across Jacksonville, FL with 1 cm horizontal accuracy (RMSE).
Using either method, features are found in the test imagery that match the reference imagery or GCPs. Geolocation errors are determined in x and y directions and an empirical CE90 geometric accuracy statistic can be produced.
I2R offers ground control point (GCP) survey service. For more information contact us at (228) 688-2570 or info@i2rcorp.com.
Single GCP Feature on the Ground
Single GCP Feature in a satellite image
