scispace - formally typeset
Search or ask a question

Showing papers on "Digital image correlation published in 1982"


Patent
05 Apr 1982
TL;DR: In this article, an image correlation device utilizing the principle of magnetoresistance was proposed, where a sensed image is compared to a preselected mask image to determine whether the two images match.
Abstract: An image correlation device utilizing the principle of magnetoresistance. A sensed image is compared to a preselected mask image to determine whether the two images match. The comparison is accomplished by electrically representing the sensed image along a first surface and the mask image along a second surface of magnetoresistive member or body of material (a magnetoresistive member is one which demonstrates a greater amount of electrical resistance transverse to a magnetic field to which the member is exposed than it does parallel to that field). Where the two images match such that there is a maximum number of corresponding points along these surfaces a maximum amount of current flows through the body. Moreover, matching images can be compared and a match recognized even where the images are at different positions along their respective top and bottom surfaces of the magnetoresistive block. This is accomplished by means of shifting the magnetic field to in effect shift the direction of the paths having the least amount of electrical resistance through the block. The device may also include a second magnetoresistive body so that both the object and the background can simultaneously by compared to preclude a match signal from occuring where one image has all the features of the second image along with some additional features not found in the second image.

11 citations