Patent ID: 9091821
Filing Date: 2015-07-28
Classification: G01B,G02B

Abstract:
1. A method of focusing on points of objects using a measuring device, the measuring device comprising a charge coupled device (CCD), the method being performed by execution of computerized code by a processor of the measuring device and comprising: (a) selecting one or more focusing points on an object; (b) positioning the CCD at the top of an initial focusing range, and moving the CCD from the top to the bottom of the initial focusing range at a first speed; (c) capturing a plurality of first images of the object during the movement from the top to the bottom of the initial focusing range, identifying an image point corresponding to each focusing point in each first image, computing coordinates of a first focal point of each focusing point according to the image points; (d) updating the initial focusing range according to Z-coordinates of the coordinates of the first focal points to generated an updated focusing range; (e) positioning the CCD at the bottom of the updated focusing range, and moving the CCD from the bottom to the top of the updated focusing range at a second speed; (f) capturing a plurality of second images of the object during the movement from the bottom to the top of the updated focusing range, identifying an image point corresponding to each focusing point in each second image, computing coordinates of a second focal point of each focusing point according to the image points in the second images; and (g) outputting the coordinates of the second focal points of the focusing points using a display of the measuring device.