Section Contents
- GIAS Home
- Screenshots
- Download for GIAS
- Help Pages
Geological Image
Analysis Software - GIAS v1.0(c) Ciaran Beggan & Christopher Hamilton
Introduction
GIAS is an image processing package written in MATLAB, which facilitates the analysis of vesicle images and spatial distributions of objects using nearest neighbor statistics. This software is in development, so we would delighted with feedback or suggestions for improvements. The software consists of a Graphical User Interface (GUI) from which you can input images or a text file of (x,y) pair positions. The output is in a CSV text file, readable by a standard spreadsheet package (e.g. EXCEL, OpenOffice Calc).
Screenshots
You will find screen shots and example outputs of the GUI here.
Download
Note: This software is in test mode (beta) at the moment. Please contact us at: gias@geoanalysis.org for more details.
A test version of the application is available as:
MATLAB p-files:
To download a copy of the MATLAB pseudocode (.p files) click here. This will run under Windows or Unix. Unzip the files into a specific directory and add that directory to your MATLAB path.
Note that the Image Processing Toolbox and the Statistics Toolbox are required to run this GUI.
Standalone executable (available on request):
Windows XP version:
To download a standalone executable which will run in Windows, you will need to install the MATLAB MCR files to run the GUI. The MCR files install a 'headless' form of MATLAB which allows you to run the GUI - you do not need to have a version of MATLAB or the associated toolboxes.
Linux version:
To download a standalone executable which will run in Linux, you will need to install the MATLAB MCR files to run the GUI. The MCR files install a 'headless' form of MATLAB which allows you to run the GUI - you do not need to have a version of MATLAB or the associated toolboxes.
Example Test Files:
To download a copy of the three test files from the submitted paper, click here. This file contains screengrabs and example statistics files to confirm the expected GIAS programme output.
The following example images and solutions are in the GIASPaperExampleTestFiles.zip file:
- Example 1: Image of the Giant's Causeway colmnar jointed basalt (GiantsCauseway.tif)
- Example 2: Thin Section of a magmatic tephra sample (LAK-t-23c.tif, Emma Passmore, unpublished data)
- Example 3: UTM coordinates of the centres of 2231 volcanic rootless cones in the Laki lava flow of Iceland (Laki_Rootless_Cone_Centroids.txt).
This is a text file and can be loaded by ticking the "NN Centroid List" box before clicking on "Load Image". The image initially dispays a two column b/w image. When "Process >>" is clicked, a convex hull is drawn about the centroid points shown in blue. The results are drawn into Nearest Neighbour analysis Tab. The Image Analysis Tab does not need to compute anything, so remains blank. The data exhibits clustering as R < 1 and the C << 0.
Help
You will find a more extensive Help section here.
Feedback
We would be delighted to have feedback, suggestions or comments that you have to make about the software. It is in testing mode at the moment, so user feedback would be most welcome. Please also report bugs to us at the following address:
gias@geoanalysis.org
We hope you will find this software useful.