Patent ID: 7778788
Filing Date: 2010-08-17
Classification: G06T,H04N

Abstract:
1. A method for measuring dimensions between selected points on a side of interest in objects selected for measurement by an optical measuring system comprising a flatbed scanner and a connected computer system, the method comprising: acquiring a reference image with the scanner of an optical coordinates reference object having optically imageable coordinate indicia therein including a reference coordinate and field coordinates distributed over a field area thereof relative to the reference coordinate; determining reference image coordinate distances for field coordinate images relative to a corresponding reference coordinate image; determining differences between reference actual distances in the optical coordinates reference object for field coordinates relative to a corresponding reference coordinate and corresponding reference image distances for corresponding images of those field coordinates to provide corresponding image distance errors for the field coordinate images; acquiring a measurement object image with the scanner of a side of a measurement object; determining measurement object image distances for selected locations in the measurement image relative to a corresponding reference coordinate; fitting a curve to image distance errors over corresponding reference image coordinate distances so as to provide deviation curves each as a function of length from a reference coordinate; determining deviation errors in the measurement object image distances for the selected locations in the measurement image using those measurement object image distances to select a corresponding deviation error from a corresponding deviation curve; combining the deviation errors in the measurement object image distances for each of the selected locations in the measurement image with the corresponding measurement object image distances to form corresponding corrected measurement object image distances for each of the selected locations in the measurement image; and using the corrected measurement object image distances for each of the selected locations in the measurement image to determine distances between chosen pairs of those selected locations.