
Volume data frequency analysis tool

December 21, 2007

Content:

      SomCmp.exe       Executable binary

      plane8.ics       Volume data example

      DigILib.dll
      FileIO.dll
      GTypesDrw.dll
      KernelLib.dll    Runtime libraries

Introduction

The software is designed to analyzing steepness distribution in volume images.
Image formats 8 bit ICS and 16 bit ICS single channel are supported. The
analysis is based on pixel difference. For each analysed data a steepness
distribution chart is computed. The righthandside of the chart refers to hogh
frequency (high steepness) contained in the image. The values in the chart are
comparable to the power of ment frequency, which means that no logaritmic or
other conversion is performed.

Using the software

The software is executed by the main file SomCmp.exe. As the main screen
appears, the volume image can be read by the "Load" button, setting the file
name properly (sample data filename is preset).

Once the image is loaded, the volume is visualised in three planes. Use the
scrollbars to view desired slice, all three views are updated immediately.

At the bottom of the window, the steepness distribution is shown. Please note
that displayed distribution refers to one horizontal line of pixels defined by
the viewed slices. For computing distribution of a whole plane, use the "Full
plane spect." button, alike "Full volume spect." buttton computes distribution
over all volume data. As these two algorithms consime some computing time,
these two distributions could not be shown realtime.

For each distribution displayed, a value called "Hi Freq Peak" is computed.
The value is sum of three highest steepness values, and may be used to
considering the noise level.