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Proceedings Paper

Landmark measurement of Hanjiangfish fossil based on digital modeling
Author(s): Yan Wang; Jianfei Ouyang; Peng Qin
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Paper Abstract

A method to accurately measure landmarks of Hanjiangfish fossil based on computer vision is presented. Hanjiangfish is a deracinated vertebrate ever lived on the earth four million years ago. The geometric morphometry of the ichthyolite based on the landmark measurement is fundamental in the vertebrate palaeontology. The landmark measurement is based on digital model of the fossil. The Hanjiangfish fossil is measured fast and accurately by using the structured-light scanning method. The digital model of the fossil then is made from the cloudy data through the acquisition, align, merge, and edit processes. The local least-square method is used to fit two lines near the measured landmark. The landmark is the point of intersection of the two fitting lines, which is unique and accurate. The distance between all pairs of landmarks and interior angles from a triangulation of the landmarks can be measured fast and accurately by the digital model. Other important geometric parameters of the fossil, such as curvature and surface area can also be measured by the digital model. The Hanjiangfish fossil is also measured accurately by a universal tool microscope, which is used as a measuring standard with higher accuracy to validate the proposed method. The experiment shows that the measured errors of the distance and angle are less than 0.1 mm and 1' respectively, which are good enough for geometric morphometry of palaeontology.

Paper Details

Date Published: 28 December 2010
PDF: 7 pages
Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 75440T (28 December 2010); doi: 10.1117/12.885669
Show Author Affiliations
Yan Wang, Tianjin Univ. (China)
Jianfei Ouyang, Tianjin Univ. (China)
Peng Qin, Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 7544:
Sixth International Symposium on Precision Engineering Measurements and Instrumentation
Jiubin Tan; Xianfang Wen, Editor(s)

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