A non exclusive selection box is provided at the top of the tool to allow camera model parameters that are to be calculated to be defined. It includes:
F : The focal lengths of the cameras. Cx and Cy : The centre of the camera's imageing plane. Ax and Ay : The aspect ratios. dsrt : radial (or other) distortion parameters.
The params button provides access to the numerical values of these selected parameters plus the parameters of the between camera stereo transformation. For some calibration tasks it is necessary to fix the stereo parameters and this can be achieved by setting them to zero values (the minimisation routines used do not modify parameters which are set to zero).