**Digital Image Correlation (DIC)** is an optical method used primarily to measure displacement and strain on structures and materials. It involves capturing images of a surface before and after deformation, using a high-resolution camera system. Here's how it works: 1. **Surface Preparation**: The object of interest is typically coated with a random speckle pattern, which acts as a reference for tracking movement. This speckle pattern can be created through various means, such as painting or using adhesive sand.
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