Patent Document ID: 9715724
Application ID: 14446295
Patent Status: 1

Claim One:
1. A method for image processing, comprising: providing a microscopic image of a structure fabricated on a substrate and computer-aided design (CAD) data used in fabricating the structure; generating, by a computer, a first directionality map for the microscopic image, the first directionality map comprising, for a matrix of points in the microscopic image, respective directionality vectors corresponding to magnitudes and directions of edges at the points irrespective of a sign of the magnitudes; producing a simulated image based on the CAD data; generating, by the computer, a second directionality map based on the simulated image; generating, based on the microscopic image, a first height map indicative of a three-dimensional (3D) shape of the structure; generating a second height map of the structure based on the CAD data; and registering the microscopic image with the CAD data based on a combination of a first comparison of the first and second directionality maps with a second comparison of the first and second height maps.