Abstract
In this study, the possible application of plenoptic camera for DIC displacement is explored. A special function, focal-distance change function, of plenoptic camera is first investigated by using 2D DIC method to know how the function would change the images in size and to know the possible pseudo in-plane displacement might introduced. Then the focal-distance change function is applied to generate two images at different focal-length with respect to an image-pair taken before and after object moved, those four images can create six independent in-plane displacement fields by DIC. In this study, four displacement fields are selected out of the six independent ones and used to calculate displacement filed with smaller standard deviation. By properly linearly combining the selected displacement fields, both standard deviation of u- and v-displacement are successfully reduced to 1/3 with respect to the original values and the u- and v-displacement field become flat as compared to the original one but the mean displacement is 10% larger than the nominal displacement determined by a precision linear stage.