The GEOMETRIC Sub-Menu

The GEOMETRIC sub-menu contains commands which allow geometrical transformations to be applied to the current region of interest. (Other commands exist in the ``KEYBOARD MENU'' which allow other transformations such as re-binning.) The GEOMETRIC sub-menu is shown in Figure 26.

Figure 26: The GEOMETRIC Sub-Menu Commands

The available commands and their functions are:

EXIT: Leave GEOMETRIC sub-menu, and return to IMAGE PROCESSING (GENERAL) main menu.

EXCHANGE: transfers data from the ``main program array'' to the ``memory array'', and vice versa. This may be useful to save some data whilst another operation is overwriting the ``main program array''.

EXTEND: Allows the size of the defined data to be increased. Normally the size is defined when the data is input from file, but it may be useful to make the number of defined pixels artifically larger. This command inputs the new size in the X and Y-directions and extends the image. The new pixels are set to zero. If a variance array exists the pixels are also set to zero.

TRANSPOSE: Transpose elements of the current region of interest. The X and Y-axis values and labels are also swapped. The transposed data is output replaces the original data, which is saved in the ``memory''.

?: Help text with short explanation of commands.

FLIP: Swaps pixels in the current region of interest, from left to right, and/or from top to bottom, as specified by the user. The operation is performed in-place. Note: If ZOOM IN is used to define a sub-region, FLIP swaps the pixels, and FULL is used, a strange effect will result, since only part of the full region will have been affected.

ZOOM-IN: allows a sub-region of the data to be selected and displayed. It should be noted that all operations only work on the current selected region.

HELP: Detailed help text on the interface and the available commands.

FULL: Sets the extent of the ``region of interest (ROI)'' or ``active data region (ADR)'' to be the whole of the currently defined data. Note: the filtering commands only affect the current region of interest.