Abstract
The optical non-contact measurement system for full-field strain measurement based on Digital Image Correlation Method ( DICM ) was newly developed. To improve the calculation speed and the accuracy, conventional DICM was modified in two ways as follows; at first, the luminance distribution obtained from digital camera was interpolated to improve the accuracy of DICM. The interpolation of brightness was conducted to the integration of brightness. In this study, two types of interpolate function were evaluated. The accuracy of proposed interpolation was higher than that of conventional interpolation method such as bi-cubic method. Next, Lucas-Kanade Method ( LKM ) which allow to track the large movement in short time was implemented to improve the calculation speed of DICM by reducing the calculation region of matching process. The calculation region was decided around the initial movement provided by LKM. The test result showed that the proposed system showed high accuracy with reasonable calculation speed.
