Importance

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Abstract

The present invention regards a method for measuring displacement of a surface at a region of interest when the region of interest is exposed to a load. The method includes the steps of (1) evenly illuminating the surface; (2) by means of a camera capturing a first set of images comprising a first image of the surface, applying a load to the surface at the region of interest, and capturing a second image of the surface; and (3) transmitting the first and second image to a processing module of a computer, wherein the processing module: (a) includes data relating to the image capture, such as the spatial position and field of view of the camera relative to the surface when the images were captured; (b) generates a global perspective transform from selected regions out of the displacement area (c) performs a global image registration between the two images using perspective transform to align the images; (d) computes vertical pixel shift and horizontal pixel shift between the first image and the second image for the region of interest; and (e) computes displacement of the region of interest between the images, in length units. The images are captured by the camera at an image camera position relative to the surface. In some embodiments two cameras are used, each capturing a single image from the same image camera position; in some embodiments multiple sets of images are captured by multiple cameras, from different perspectives.

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First Claim