Patent Document ID: 9319666
Application ID: 13908565
Patent Status: 1

Claim One:
1. A device, comprising: one or more processors to: receive an image including a calibration pattern; apply a cross derivative filter to the image based on a first coordinate plane, the cross derivative filter including a cross derivative of a Gaussian function; determine a first plurality of response peaks associated with the calibration pattern based on applying the cross derivative filter, the first plurality of response peaks being associated with a plurality of control points associated with the calibration pattern and a plurality of boundary points associated with the calibration pattern, the plurality of boundary points being points along an edge of the calibration pattern; determine a second plurality of response peaks associated with the calibration pattern based on applying a first filter, including a derivative of the Gaussian function based on a second coordinate plane, and applying a second filter, including a derivative of the Gaussian function based on a third coordinate plane, the second plurality of response peaks being associated with the plurality of boundary points; determine the plurality of control points based on removing the second plurality of response peaks, associated with the plurality of boundary points, from the first plurality of response peaks; and provide information that identifies the plurality of control points.