Behavior Research Methods, Instruments, & Computers

, Volume 26, Issue 4, pp 443–446

A simple method using a single video camera to determine the three-dimensional position of a fish

  • Pedro Pereira
  • Rui F. Oliveira
Instrumentation & Techniques

DOI: 10.3758/BF03204663

Cite this article as:
Pereira, P. & Oliveira, R.F. Behavior Research Methods, Instruments, & Computers (1994) 26: 443. doi:10.3758/BF03204663


In the present paper, we describe a method for recording the coordinates of a fish in an aquarium in a three-dimensional space, using a single video camera and a mirror. We use photogrammetic equations for this, considering the image obtained in the mirror as a virtual image obtained by a second camera. A transformation of the coordinate system is required to express the obtained coordinates in anx,y,z system defined by the edges of the aquarium. The accuracy of the proposed method was estimated, and errors in extreme conditions were found to be 0.8% to 1.2 %, compared with the dimensions of the aquarium used in the test.

Download to read the full article text

Copyright information

© Psychonomic Society, Inc. 1994

Authors and Affiliations

  • Pedro Pereira
    • 1
  • Rui F. Oliveira
    • 2
  1. 1.Universidade de LisboaCascaisPortugal
  2. 2.Instituto Superior de Psicologia AplicadaLisboaPortugal