Patent Document ID: 10008007
Application ID: 14031711
Patent Status: 1

Claim One:
1. A stereo system comprising: a calibration object having known dimensions and a plurality of points having known relationships to one another and that are identifiable in images of the object; a projector configured to project a sequence of structured-light patterns that code corresponding projector coordinates in the structured-light patterns; a camera to capture a plurality of images of the object at each of a plurality of orientations of the object with the object being illuminated by the sequence of structured-light patterns at each of the plurality of orientations; and a computer having a storage medium for storing the plurality of images and at least one processor configured to: identify each of the plurality of points in each of the plurality of images and determine a camera coordinate for each of the plurality of points identified in the plurality of images; automatically determine projector coordinates for each of a plurality of pixels in each of the plurality of image from the structured light patterns in each of the plurality of images; compute a local homography for each point identified in the plurality of images, each local homography determined from the projector coordinates determined from pixels in a neighborhood of the respective point identified in the plurality of images, each local homography providing a local transformation from camera coordinates to projector coordinates; transform the camera coordinate of each point identified in the plurality of images to a respective projector coordinate using the corresponding local homography; determine intrinsic camera parameters using the known dimensions of the object and the determined camera coordinates of each of the plurality of points identified in the plurality of images; determine intrinsic projector parameters using the known dimensions of the object and the projector coordinates transformed from the respective camera coordinates by the respective local homography; and determine a transformation that relates locations of the camera and the projector to calibrate the projector-camera pair of the stereo system.