Abstract
We investigated a method to measure displacement distribution in the full view field of a CCD camera using digital image correlation (DIC) technique. This method intends to measure displacement distribution on a surface by comparing two images before and after deformation taken with a CCD camera. In this method, template matching of the corresponding points on the two images with accuracy less than one pixel is necessary to measure small displacement. In general, image sensor such as CCD and CMOS has scatter of sensitivity in each pixel. This scatter in sensitivity causes difference of gray level in each pixel and has a large influence on the template matching for the DIC method. In this study, we investigated difference of sensitivity in each pixel of a image sensor and we considered a method to measure sensitivity difference for each pixel and also considered a method to calibrate gray level for sensitivity scattering.
