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TECHNICAL BRIEFS

A Technique for Calibrating Measurements From Photographs of Sliced Specimens

[+] Author and Article Information
JungSoo Han, Jaiyoung Ryu

Orthopedic Research Lab, Department of Orthopedics, West Virginia University, Robert C. Byrd Health Sciences Center, Morgantown, WV 26506-9196

Huicong Wang, Bruce Rowen

Orthopedic Biomechanics Lab, Department of Orthopedic Surgery, Texas Tech University Health Sciences Center, El Paso, TX 79905

J Biomech Eng 117(4), 495-497 (Nov 01, 1995) (3 pages) doi:10.1115/1.2794214 History: Received May 31, 1994; Revised July 11, 1995; Online October 30, 2007

Abstract

Determining the geometry of articular joint surfaces is critical to the study of human joint mechanics. Photographs of sliced specimens (PSS) is currently one of the most popular methods used to determine surface geometry. This study sought to improve the photographs of sliced specimens method through a new calibration technique that includes a mathematical model and a precise plastic grating (calibration grid). Simulations showed that calibration results for x and y coordinates using the new technique attained a high degree of accuracy that was independent of camera and projector lens quality, degree of parallelity between the projector and digitizing table and selection of the area to be calibrated.

Copyright © 1995 by The American Society of Mechanical Engineers
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