A quick guide to the Calibration of any camera using ContextCapture

Steps to Accomplish

Step 1.   Camera Setup

1. Remove optical stabilization.

2. Disable photo auto-rotation

3. If you are unfamiliar with the camera use <<Automatic>> mode

4. Fix the focal length

5. Fix image dimensions

Changing the camera focal length (zoom+/-) and / or the image dimensions will result in a different calibration.

Step 2.   Photo acquisition

1. Select a highly textured and geometrically complex scene

2. Acquire photos at 360 deg around the scene

3. Shoot photos holding the camera in different positions (horizontal / vertical). NB. this only applies if auto-rotation mode is disabled 

   
   

Step 3.   Process your dataset in ContextCapture

1. Create a new project and import your photos

2. In the Photogroup tab, select the type of camera being used: perspective / fish-eye

3. Submit and aerotriangulation. In the aerotriangulation definition settings set << optical properties estimation mode >> to << multipass >>

Step 4.   Store your camera calibration in the user database

1. Go to the Photo tab and right click on the photogroup. Click << add camera to database >>

2. When processing another project using the same camera, the latest calibration will be used by default. If not you can still browse to it from the camera database by selecting << get camera model from the database >>

Step 5.   Prevent the software from adjusting the parameters

1. In specific cases, you may want to prevent the software from adjusting the camera parameters, i.e. If a calibration already exists or has already been imported from the database. 

2. In the aerotriangulation definition settings, set the focal length, principal point and radial distortion to << keep >>.

See Also

http://communities.bentley.com/products/3d_imaging_and_point_cloud_software/m/mediagallery/271352