Camera Devices Dialog

Open the Camera Devices dialog where you can manage settings of camera devices for each camera model (photogroup).

Optical properties

Model type: Two camera model types are supported:
- Perspective: perspective projection combined with a classical Brown's distortion model, suited for rectilinear lens or lens with low distortion.
- Fisheye: Suited for wide-angle or fish-eye lens with extreme lens distortion.
Sensor size (mm): ContextCapture may need to know the size of your camera's sensor. The needed sensor size is the sensor's largest dimension. If your camera model is not already listed in our database, you will be asked to enter this information. If you are unsure of your camera's specifications, you can consult the Digital Photography Review or contact Bentley Systems technical support.
Image dimensions (px): Image dimensions in pixels.
Focal length: For a newly created photogroup, ContextCapture can generally extract a coarse guess of the focal length in mm from EXIF metadata. Otherwise, you will be asked to enter this initial guess. Later, ContextCapture can automatically estimate the focal length more accurately by aerotriangulation.
We recommend to specify sensor size and/or focal length for each photogroup. If these properties are missing, ContextCapture will assume that the 35 mm equivalent focal length equals to 50 mm. If the correct focal length value differs significantly, the aerotriangulation may fail. In such cases it is required to specify initial camera properties manually.
Distortion: For a newly created photogroup, ContextCapture considers that there is by default no lens distortion. Later, ContextCapture can automatically estimate lens distortion more accurately by aerotriangulation. Not used for fisheye camera models.
Principal point (px): For a newly created photogroup, ContextCapture considers that the principal point is by default at the center of the image. Later, ContextCapture can automatically estimate the principal point more accurately by aerotriangulation.
Aspect ratio/Skew: Properties used when pixels are not square.
- Skew: coefficient defining the angle between x and y pixel axes.
- Aspect ratio: different from 1 if the pixel are not square.

Save

Save modifications to camera model.

Load

Opens the camera database, it contains two kinds of items:

ContextCapture items are camera models provided with ContextCapture. These items are read only and the item list is updated daily by the ContextCapture support team.
User items are camera models you added or imported on your computer.