Free instrument for measurements of motion

被引：17

作者：

Pena, Norberto ^{[1
]}

Credidio, Bruno Cecilio ^{[2
]}

Martinez Salles Correa, Lorena Peixoto Nogueira Rodriguez ^{[2
]}

Souza Franca, Lucas Gabriel ^{[2
]}

Cunha, Marcelo do Vale ^{[2
]}

de Sousa, Marcos Cavalcanti ^{[2
]}

Bomfim Cruz Vieira, Joao Paulo ^{[2
]}

Vivas Miranda, Jose Garcia ^{[2
]}

机构：

[1] Univ Fed Bahia, Dept Fisioterapia, Fac Ciencias Saude, Salvador, BA, Brazil

[2] Univ Fed Bahia, Inst Fis, Lab Fis Nucl Aplicada, Salvador, BA, Brazil

来源：

REVISTA BRASILEIRA DE ENSINO DE FISICA | 2013年 / 35卷 / 03期

关键词：

computer vision; simple pendulum; SIT-TO-STAND; MOVEMENT; TRUNK; CHAIR;

D O I：

10.1590/S1806-11172013000300024

中图分类号：

G40 [教育学];

学科分类号：

040101 ; 120403 ;

摘要：

This paper presents the validation of a computational tool that serves to obtain continuous measurements of moving objects. The software uses techniques of computer vision, pattern recognition and optical flow, to enable the tracking of objects in videos, generating data trajectory, velocity, acceleration and angular movement. The program was applied to track a ball around a simple pendulum. The methodology used for this validation takes as a basis for comparisons the measured values of the program as well as the theoretical values expected according to the model of a simple pendulum. The experiment is appropriate to the method because it was built within the limits of the linear harmonic oscillator, and energy losses due to friction had been minimized, making it the most ideal possible. The results indicate that the tool is sensitive and accurate. Deviations of less than a millimeter in the measurements of the trajectory ensure the applicability of the software on physics, either in research or in teaching topics.

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