DIVA - USER MANUAL

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THE AREA ROI GUI

1. Cursor Information

The positional coordinates of the cursor is displayed in the information bar at the bottom of the GUI. Also, displayed is the pixel value of that element.

2. Other functions

Zoom Factor The image may be zoomed (default is no zooming, ie: 1x). The maximum value of zooming is constrained by the screen size (for smaller ROI's the allowed zooming will be higher).
Surface Depending on the size of the ROI image, a wire-mesh or lego (stacked histogram-style) representation of the image will be displayed (see the example below). This may be rotated about the
  • x-axis, in degrees relative to the viewer
  • z-axis, in degrees relative to the viewer
using scroll-bars. Printing is also available.
Stats... A statistical analysis of the ROI image will be performed. The results will be displayed in the STATISTICS GUI.
Print The ROI image may be exported and printed. Optional file formats include JPEG, TIFF, PS, etc.
Histogram The histogram of the selected ROI will be displayed
Line averaged profile... The line-averaged profiles of either the columns or rows is available. The resultant profiles are displayed in the LINE_AVE_PROFILE GUI, where they may be rescaled and printed. Also, when this GUI is active, clicking on the ROI image will overplot the mouse-selected line or column (see the example below).

3. An Example

Blah

This is a rectangular ROI (taken from the same image as that shown above). Note that the coordinates and corresponding pixel value are the same as those of the original image.
This is a surface representation of that ROI. The surface type has been set to solid - other options include mesh and lego. The default viewing angles are 30degrees in both the x and z directions.
This is the line-averaged profile of the columns. This is used to gauge any variations along a row of pixels (and vice-versa for the line-averaged profile of the rows), for example to investigate "first-pixel" anomolies.

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E-mail me at j.a.rainnie@rl.ac.uk

Copyright © 2003 John Rainnie
Last updated January 2003