2014 Volume 14 Issue Special_Issue Pages s177-s181
Two dimensional displacement of the lighting marker on a plane can be measured with one camera image. However, the measuring process needs the complex calibration of the coordinate system and of the camera states. The developed 2D displacement measuring method can detect the displacements of several four-point LED (Light Emitting Diode) markers, without the complex calibrations. With our method, the camera parameters, which characterize the camera status, can automatically be determined with four positions of the lighting LED on the local coordinate system, for each four-point LED marker. The high-resolution and high-speed camera was used for the development of software and for the displacement measurement. The resolution power of the CCD was 1024x768 pixels for each monochromatic 8 bits resolution, and the sampling interval was 100 times per second. It was confirmed that our method could measure the displacement with enough resolution power, for the purpose of the displacement measurement by the large scale extensometers.
