Author:Gary Chinga (gary.chinga@pfi.no) History:2002/06/03: First version

2002/09/06: Added option to display single particle shape descriptorsRequires:ImageJ 1.28 or later Source:Shape_Descriptors.java Installation:Download Shape_Descriptors.class to the plugins folder and restart ImageJ. Description:This plugin calculates shape descriptors. The mean and standard deviation of shape values are given for every image in a stack. The definitions are given according to Russ, 1999 (The image processing Handbook). The following descriptors are given: TheForm factor:4pi*area/sqr(perimeter)

Roundness:4*area/pi*sqr(major axis)

Compactness:sqrt((4/pi)*area)/major axis

Aspect Ratio:major axis/minor axis

Analyze/Set Measurements..."Limit to Threshold" option must be checked (only thresholded pixels are included in measurement calculations). UseImage/Adjust/Thresholdto set the threshold limits. Edge particles must also be excluded during measurement.