Digital / UAV camera

You can enter camera-calibration either automatically or manually.

With the available Import command, you can import an XML file of camera-calibration information, thereby automatically entering all of the information from the file you specify.

Note: The XML file you import must be in the correct format.

The manual process is to enter the specifics of the information to suit.

Using a grid file
If necessary, you can use a grid file to correct for distortion. A grid file is a self-calibration grid created with BINGO. The file contains, in addition to other parameters created after bundle adjustment, all distortions in image and ground space, such as lens distortion, Earth curvature, atmospheric correction, and others. The supported format of the grid file is Z/I (.dat).

To automatically enter camera-calibration information for a digital aerial camera using an xml or cam file

Click Text File....
In the File Selector window, select the file you want, and then click Open.

To automatically enter camera-calibration information for a digital aerial camera using EXIF tags

Click Image EXIF....
In the File Selector window, select a photo to be used in the project, and then click Open.
The following EXIF tags are required to set Focal length, chip Width and chip Height.
- EXIF.FocalLength
- EXIF.FocalPlaneXResolution
- EXIF.FocalPlaneResolutionUnit or EXIF.ResolutionUnit
  or
- EXIF.FocalLength
- EXIF.FocalLengthIn35mmFilm

To manually enter camera-calibration information

In the Parameter units list, select the applicable units for the calibration: mm (millimeters) or Pixel.
In the Name box, enter the name of the camera that captured the images. The camera name is primarily used when exporting to BINGO.
In the Focal length box, type the focal length.
Beside Principal point offset (PPO), in the Xp and Yp boxes, type the x-offset and y-offset, respectively.
Under Chip Size and Y-Scale Factor:
1. In the Width and Height boxes, type the width and height, respectively, of the camera CCD.
2. In the Y-scale factor box, type the parameter factor.
  You can find the factor value of the parameter in the manufacturer specifications or, if available, in the camera-calibration report.
Under Distortion Correction, beside Method, select how you want to apply correction for distortion:
- To enter coefficients for radial-lens correction, click Radial lens and decentering, and then under Radial-Lens Coefficients, type an appropriate value in the boxes R0 through R7.
  If you have a table of distortion pairs, click Compute from Table, and then see Entering radial lens distortion from a table.
  
  Under Decentering Coefficients, in the boxes P1 through P4, type an appropriate value in each.
  Note: B1 and B2 are not used.
- To use a grid file, click Grid file, and then in the File box, type the path and name of the grid file or, to select a file, click Browse.
Under Other Parameters:
1. In the Image scale box, type the nominal scale.
2. To correct for atmospheric refraction, select the Apply atmospheric-refraction correction check box.
3. To correct for curvature of the Earth, select the Apply Earth-curvature correction check box, and then in the Earth radius box, type the Earth radius in meters.