Digital image correlation for measuring skin strain and deformation

A system for measuring surface deformation and strain using digital image correlation of a surface of a test object, the system comprising:

• a data collection system configured to acquire images of the surface, the surface having a unique surface pattern;
• and
• a lines of non-extension (LoNEs) processor configured to:
• group the images into one or more image sets;
• perform three dimensional image correlation on each of the image sets to determine deformation and strain data;
• stitch the deformation and strain data from the image sets into one dataset;
• determine principal strains and LoNEs directions;
• determine one or more LoNEs streamlines;
• determine lines of maximum and minimum extensions;
• provide visualizations for the strain magnitudes, LoNE streamlines, maximum and minimum extension streamlines in three dimensions;
• and
• generate, based on one or more of the determined principal strains, the LoNEs directions, the one or more LoNEs streamlines and the lines of maximum and minimum extensions, a pattern for one or more customized coverings for the test object.

A non-transitory machine-readable storage medium, having encoded thereon program code, wherein, when the program code is executed by a machine, the machine implements a method for measuring surface deformation and strain using digital image correlation of a surface of a test object, the method comprising:

• acquiring images of the surface, the surface having a unique surface pattern;
• grouping the images into one or more image sets;
• performing three dimensional image correlation on each of the image sets to determine deformation and strain data;
• stitching the deformation and strain data from the image sets into one dataset;
• determining principal strains and lines of non-extension (LoNEs) directions;
• determining one or more LoNEs streamlines;
• determining lines of maximum and minimum extensions;
• providing visualizations for the strain magnitudes, LoNE streamlines, maximum and minimum extension streamlines in three dimensions;
• and
• based on one or more of the determined principal strains, the LoNEs directions, the one or more LoNEs streamlines and the lines of maximum and minimum extensions, generating a pattern for one or more customized coverings for the test object.