Accuracy Studies

iWitness is clearly the most accurate low-cost close-range photogrammetry software commercially sold. Recent testing revealed iWitness compared to a total station to an accuracy level of better than 25mm (RMS 1-sigma).

A recent higher precision test compared iWitness to two Vision Metrology Software Systems for industrial measurement. The results revealed that iWitness is capable of 3D measurement to better than 1:50,000 of the object size.

We encourage you to review these project studies. Depending on what your requirements are, and upon the size of the object and the selected camera, iWitness can measure your project to an accuracy level ranging from a few centimeters, all the way down to 20 microns (i.e., less than a thousandth of an inch).

iWitness compared to Total Station (Spring, 2007 at NCDOJ)

Carried out in conjunction with members of North Carolina Police Officers (NCDOJ), Spring 2007

"... the results indicated an accuracy agreement to an average of 7/16" (11mm) over a test range area spanning approximately 75 feet (wide) by 125 feet (long)."

Carried out in conjunction with members of the organization Forensic Accident Reconstruction of Oregon (FARO), Spring 2004

"... the results indicated an accuracy agreement to within one inch over a test range area spanning approximately 100 feet (wide) by 150 feet (long)."

Carried out by Photometrix Pty Ltd, Melbourne, Australia

"... iWitness has demonstrated an accuracy, equivalent to that achieved with high-end vision metrology systems. Testing revealed iWitness is capable of producing accurate measurements better than one-thousandth of an inch."

(This report is also available in PDF format (52kb))

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