METHODS AND APPARATUS FOR MEASURING 3D DIMENSIONS ON 2D IMAGES

摘要

An apparatus (10) for determining 3D distances on a 2D pixelized image (14) of a part (16) or object is provided. The apparatus includes a camera (12), a computer workstation (21) configured to receive images from the camera and having a 3D CAD model of the object, and a display. The apparatus is configured to acquire (102) a real 2D pixelized image of the object, create (104) a simulated image of the object using the 3D CAD model, determine a specified cost function comparing (108) the simulated image with the real 2D pixilated image, reposition (110) the simulated image in accordance with interated adjustments of a relative position between the CAD model and the 2D pixilated image to change the simulated image until the specified cost function is below a specified value, generate (112) a 3D distance scale matrix (206) using the repositioned simulated image, and measure and display distances between selected pixels (202, 204) on a surface of the real image using 2D distances on the pixelized image of the object and the 3D distance scale matrix.