A cursory glance at the Camera Parameters screen shows the following features:

 The various features provide numerous alternative approaches to camera management, although the likely sequence of operations would be to Add a camera definition, Modify it if one of the parameters is subsequently found to be inaccurate, and Delete it if the camera definition is no longer pertinent or accurate. Discussion of the camera management feature will follow this logical sequence. The Close Button is used to exit the Camera Management option and return to the Process Options Screen.

Adding a camera to the Camera Definitions file requires the specification of the camera's name and parameters. Begin by typing a name in the Camera System field. As recommended earlier, it is advisable that the name of the camera discriminate not only between different physical devices but also between different attributes of the same camera. Enter the camera's focal length in micrometers (microns) in the Principal Dist field.

Next, use the mouse to set the Interior Orientation, Radial Distortion and Asymmetric Distortion switches. Select the Yes setting if values of the parameters are known and to be applied or if values for the parameters are sought through GIANT's self calibration option. If parameter values are not known, not to be applied or not desired, select the No setting. The switches may be set to Yes or No in any combination. For completeness of this discussion all three options will be considered to be active as shown in the above illustration of the Camera Parameters screen.

 Three fields that correspond to the three parameters of interior orientation (refinements to the coordinates of the principal point, dX_o, dY_o, and refinements to principal distance or focal length, dF) appear. Use the mouse to select a field and key in the corresponding parameter value.

To the far right of the display are three sets of Yes/No switches labeled Adjust. By default the switch is set to No, meaning the value of the parameter is not to be adjusted. If there is uncertainty or lack of confidence in the value and the user wishes to refine the parameter, use the mouse to set the Adjust switch to Yes. When set to Yes, two additional widgets appear. The first, to the left, is a field labeled Std and represents standard deviation. Enter the standard deviation of the parameter, in micrometers.

 As in the previous two instances, the screen offers the three parameters of the asymmetric distortion compensation model, D4, D5 and K, for numerical entry and adjust status specification. The operation of the screen is identical to the previous discussions.

 When the Interior Orientation, Radial Distortion and Asymmetric Distortion screens have all been configured suitably, return to the main camera management screen by using the mouse to select the Camera tab of the menu bar. The remaining information to complete the camera definition are the Default Standard Deviations table. Use the mouse to select a field and key in an appropriate standard deviation for each entry of the table. As always, remember that the standard deviation is a measure or estimate of uncertainty in a parameter. The larger the uncertainty of a parameter, as indicated by its standard deviation, the less influence the parameter will have on the adjustment. Fidelity of the adjustment relies on realistic standard deviation assignments.

All of the required information for a camera definition has now been provided. Save the camera definition by selecting the Add button at the bottom of the screen with the mouse. Confirmation that the camera definition was in fact saved may be obtained by visiting the Camera System field towards the top of the screen. To its right is the standard Windows list button identified by its arrow icon. Click on the arrow to produce the list of camera definitions, and confirm the latest addition.

In the same manner, any number of camera definitions may be added to the Camera Definition file. Suppose now that the Camera Definitions file contains the definitions of 5 cameras: when the list arrow is pushed, five camera system names appear in the list. It is known that one camera has an incorrect focal length because two digits were noticed to have been transposed during the original addition of the camera definition. The value must be edited. Camera definition editing is achieved with the Modify button. To modify a camera definition, first use the list feature of the Camera System field to list all the camera definitions in the file. Double click on the name of the camera whose focal length requires editing. The main Camera screen will refresh with the currently-stored values of the parameters. (As a matter of fact, the three other screens that are not displayed have also had their parameters refreshed.) Modify the focal length by selecting the Principal Dist field and keying in the correct value of the focal length. To complete the operation and store the edited parameter values in the Camera Definition File, select the Modify button. Any parameter on any of the camera management screens can be modified in this manner.

The final camera management task is the Delete camera definition feature. Delete a camera definition by first using the Camera System list function to generate the list of Camera Systems in the Camera Definition File. Select the Camera System to be deleted. The main Camera screen will refresh with the currently-stored values of the parameters. Confirm that this is, in fact, the camera system to be deleted and, if so, select the Delete button using the mouse. Before deleting the camera system GIANT will pop up an additional confirmation window. Select the affirmative to complete the deletion. Following the deletion the screen clears. The Camera System list feature can be used to confirm the removal of the camera from the Camera Definitions File.