Particle Analysis - Introduction
Particle analysis is used to segment (divide up) the image
so that you can select certain image features of interest to you.
Particle analysis can find image features based on:
- Pixel intensity: pixels within a certain range (or ranges) are found.
- Groups of connected pixels can be isolated based on the minimum or maximum
number of pixels in a connected group.
- The largest or smallest groups of connected pixels can be isolated.
A "particle" is a group of connected image pixels.
A pixel is "connected" to a neighbouring pixel, when both pixels fall
within the defined intensity range. In this way, connected structures are built up
either within individual slices (2-dimensional connections) or
within the whole block of slices (3-dimensional connections).
When particle analysis is performed, the intensity (brightness)
of pixels that are not selected is set to zero.
The particle analysis feature of Jim is often used in combination with the
Image Statistics tool to determine statistics about
the pixels isolated by particle analysis.
Once particle analysis has been performed on an image, the result can
be saved to disk as a new image, for later retrieval and viewing.
Start the Particle Analysis tool from the Toolkits menu: 
The Particle Analysis frame will now appear as shown below:
The next section shows you
how to use this tool.