http://www.monit.pw.edu.pl/var/ezflow_site/storage/images/listopad/Mechatr_Met_niekoh_19_11_2009.pdf
http://www.elhys.com.pl/systemy_cyfrowej_korelacji_obrazu__dic_.html
http://www.elhys.com.pl/shearography.html
http://elhys.com.pl/systemy_cyfrowej_korelacji_obrazu__dic_/przenosna_glowica_q_480-55.html
http://www.nascon.pl/pl/news/33/laboratorium-system-cyfrowej-korelacji-obrazu
http://czas.stomat.net/upload/articles/13/1262.pdf
http://www.youtube.com/watch?v=Nsya2bN8pg4
http://www.youtube.com/watch?v=m-Q6zE86qyc


3D Image Correlation provides full 3D coordinates of the surface of the material in test, using two camera
stereoscopic view, which provides true deformation and strain data. 2D image correlation, uses one camera,
providing relative displacement and strain data. As long as strain is greater than 1% and a longer lens is used,
2D can work well. 3D is much safer and more accurate.