Patent ID: 7711180
Filing Date: 2010-05-04
Classification: G06T

Abstract:
1. A three-dimensional image measuring apparatus, including a computer, comprising: a resolution-specific grid image forming section of the computer for generating reference images and search images sequentially from high-resolution images to low-resolution images with respect to a pair of stereo images, wherein approximate positions of the search images corresponding to points of the reference images are extracted using the low-resolution images, and then more precise positions thereof are sequentially extracted using the high-resolution images; an area setting section of the computer for setting a reference area in the reference images of the pair of stereo images and a search area in the search images of the stereo images in a position corresponding to the reference area; a unitary geometric shape network forming section of the computer for forming a unitary geometric shape network that covers the reference image and the search image of the stereo images by duplicating a unitary geometric shape two-dimensionally, wherein the reference area and the search area set by the area setting section are of the unitary geometric shape and forming sequentially a finer geometric shape from a coarser geometric shape for an image distortion correction, wherein the initial values of corresponding points of the high resolution images are obtained by interpolation using values for known points of the low resolution images; a search image distortion correcting section of the computer for applying an image distortion correction to either one of the images according to positional relationship between the reference area and the search area corresponding to the reference area, correcting a distortion of the search area shape with respect to the reference area according to positional relationship between the reference area and the search area, determining search widths at respective points in the search image after the search image distortion correction according to tilts of the respective unitary geometric shapes and obtaining positional relationship between the reference area and the search area corresponding to the reference area, using one image of the pair of stereo images and an other image of the pair of stereo images corrected by the image distortion correction; and an area shape measuring section of the computer for measuring a shape of a measuring object photographed in the stereo images based on the reference area in the one image and the search area in the other image, to either one of which the image distortion correction has been applied.