Figure 3. The speckle pattern created on the analyzed smartphone surface

From

The Methodology for Realization of Smartphone Drop Test Using Digital Image Correlation

Martin Hagara, Róbert Huňady, Pavol Lengvarský, Jozef Bocko

American Journal of Mechanical Engineering. 2016, 4(7), 423-428 doi:10.12691/ajme-4-7-35