How does correlation work in an image?

1. How does image correlation work?
2. What does a digital image correlation measure?
3. What is correlation coefficient in image processing?

How does image correlation work?

What is the method? DIC works by comparing digital photographs of a component or test piece at different stages of deformation. By tracking blocks of pixels, the system can measure surface displacement and build up full field 2D and 3D deformation vector fields and strain maps.

What does a digital image correlation measure?

Digital Image Correlation (DIC) is a 3D full-field, non-contact optical technique to measure contour, deformation, vibration and strain on almost any material. The technique can be used with many tests including tensile, torsion, bending and combined loading for both static and dynamic applications.

What is correlation coefficient in image processing?

In image processing, correlation is defined as: Y(r,c)=∑hr′=−h∑wc′=−wI(r+r′,c+c′)F(r′,c′), where the image I has dimensions (2h+1)×(2w+1) and the filter F is assumed to be using some sort of padding (https://www2.cs.duke.edu/courses/fall15/compsci527/notes/convolution-filtering.pdf).