Image after conversion to 8-bits, smooth,
find-edges, binary/threshold, and invert.
The hough space. Lighter regions represents
most probable places for finding centers of circles
of predefined radius. The “number of circles”, X,
entered by the user, will be used to choose the X most
lightest points in the hough space. The user can also
enter a threshold for the histogram of the Hough Space,
instead of the number of circles.
Image with the center of the two iris marked.
Notice that, in this example, we are looking for a
predefined number of circles (2) with predefined
radius (11). (The algorithm tolerate a small error in
Author: Karl Schmidt (email@example.com) Date: 2002/06/19 Source: Included in the ZIP archive Installation: Download MRI_CALC_PLUGIN.zip and unzip the files to a temporary folder. Once unzipped,
Author: Paul Baggethun, an engineer in Pittsburgh, PA History: 2002/05/01: First version 2009/05/14: Works with batch mode macros Source: Radial_Profile.java Installation: Download Radial_Profile.class to the
Author: Jeffrey Kuhn (firstname.lastname@example.org) The University of Texas at Austin Date: 2000/8/22 Source: MeasureMTF_.java API: MeasureMTF_.html Installation: Download MeasureMTF_.class to the plugins folder and restart
Author: Wayne Rasband (email@example.com) Date: 2000/8/17 Source: Circularity_.java Installation: Circularity calculations are built into ImageJ 1.29 and later. Check “Circularity” in Analyze/Set Measurements and the