Patent application number | Description | Published |
20090153669 | METHOD AND SYSTEM FOR CALIBRATING CAMERA WITH RECTIFICATION HOMOGRAPHY OF IMAGED PARALLELOGRAM - A method for calibrating a camera including (a) obtaining a two-dimensional (2D) homography that maps each of parallelograms projected onto images taken by two arbitrary cameras into a rectangle, wherein the 2D homography is defined as a rectification homography and wherein new cameras that have virtual images are defined as rectified cameras and a new infinite homography is generated between the two rectified cameras, the virtual images being transformed from original images by the rectification homography; (b) obtaining an original infinite homography by using the correlations among the new infinite homography, the rectification homography and the original infinite homography; and (c) obtaining intrinsic camera parameters based on the correlation between the original infinite homography and the intrinsic camera parameters, thereby calibrating the camera. | 06-18-2009 |
20100119109 | MULTI-CORE MULTI-THREAD BASED KANADE-LUCAS-TOMASI FEATURE TRACKING METHOD AND APPARATUS - A multi-core multi-thread based Kanade-Lucas-Tomasi (KLT) feature tracking method includes subdividing an input image into regions and allocating a core to each region; extracting KLT features for each region in parallel and in real time; and tracking the extracted features in the input image. Said extracting the features is carried out based on single-region/multi-thread/single-core architecture, while said tracking the features is carried out based on multi-feature/multi-thread/single-core architecture. | 05-13-2010 |
20100158352 | APPARATUS AND METHOD FOR REAL-TIME CAMERA TRACKING - A camera tracking apparatus for calculating in real time feature information and camera motion information based on an input image includes a global camera tracking unit for computing a global feature map having feature information on entire feature points; a local camera tracking unit for computing in real time a local feature map having feature information on a part of the entire feature points; a global feature map update unit for receiving the computed feature information from the global and local camera tracking units to update the global feature map; and a local feature selection unit for receiving the updated feature information from the global feature map update unit to select in real time the feature points contained in the local feature map. The local camera tracking unit computes the local feature map for each frame, while the global camera tracking unit computes the global feature map over frames. | 06-24-2010 |
20100158353 | METHOD FOR RESTORATION OF BUILDING STRUCTURE USING INFINITY HOMOGRAPHIES CALCULATED BASED ON PARALLELOGRAMS - A method for restoration of building structure using infinity homographies calculated based on parallelograms includes: calculating, using two or more parallelograms, an infinity homography between those cameras which refer to an arbitrary camera; restoring cameras and the building structure on an affine space using the computed infinity homography and homologous points between images; and transforming the restored result onto the metric space using constraints on orthogonality of vectors joining the restored three-dimensional points, the ratio of lengths of the vectors and intrinsic camera parameters. As a result, intrinsic camera parameters, camera positions on the metric space and the structure of the building are restored. All the restoration is possible even when intrinsic camera parameters corresponding to all the images are not constant. | 06-24-2010 |
20100245593 | APPARATUS AND METHOD FOR CALIBRATING IMAGES BETWEEN CAMERAS - An apparatus for calibrating images between cameras, includes: a detector for detecting dynamic markers from images taken by a motion capture camera and a video camera; a 3D position recovery unit for recovering 3D position data of the dynamic markers obtained by the motion capture camera; a 2D position tracking unit for tracking 2D position data of the dynamic markers obtained by the video camera; a matching unit for matching the 3D position data and the 2D position data of the dynamic markers; and a calibrating unit for converting the 3D position of the dynamic markers on a spatial coordinate system into image coordinates on an image coordinate system of the video camera to calculate intrinsic parameters and extrinsic parameters of the video camera to minimize a difference between coordinates of the 2D position data and the image coordinates. | 09-30-2010 |
20110249095 | IMAGE COMPOSITION APPARATUS AND METHOD THEREOF - An image composition apparatus includes a synchronization unit for synchronizing a motion capture equipment and a camera; a three-dimensional (3D) restoration unit for restoring 3D motion capture data of markers attached for motion capture; a 2D detection unit for detecting 2D position data of the markers from a video image captured by the camera; and a tracking unit for tracking external and internal factors of the camera for all frames of the video image based on the restored 3D motion capture data and the detected 2D position data. Further, the image composition apparatus includes a calibration unit for calibrating the tracked external and internal factors upon completion of tracking in all the frames; and a combination unit for combining a preset computer-generated (CG) image with the video image by using the calibrated external and internal factors. | 10-13-2011 |
20130016223 | METHOD AND APPARATUS FOR CAMERA NETWORK CALIBRATION WITH SMALL CALIBRATION PATTERNAANM KIM; Jae HeanAACI DaejeonAACO KRAAGP KIM; Jae Hean Daejeon KRAANM Kang; HyunAACI DaejeonAACO KRAAGP Kang; Hyun Daejeon KRAANM Lee; Ji HyungAACI DaejeonAACO KRAAGP Lee; Ji Hyung Daejeon KRAANM Koo; BonkiAACI DaejeonAACO KRAAGP Koo; Bonki Daejeon KR - A method for calibrating a camera network includes generating a projection matrix by each of cameras in respect of a calibration pattern that is disposed at a plurality of different positions in a photography zone. A portion of the projection matrix is produced as a sub-projection matrix. Sub-projection matrixes are arranged widthwise and lengthwise to generate one sub-measurement matrix. A singular value decomposition (SVD) is performed on the sub-measurement matrix to change the sub-measurement matrix into a matrix having a rank of 3 and a SVD is performed on the changed sub-measurement matrix. A rotation value of the calibration pattern, and an internal parameter and a rotation value of each camera are extracted to thereby calibrate the camera network. | 01-17-2013 |
20150213644 | MULTI-PRIMITIVE FITTING DEVICE AND OPERATION METHOD THEREOF - Provided are a multi-primitive fitting method including an acquiring point cloud data by collecting data of each of input points, a obtaining a segment for the points using the point cloud data, and a performing primitive fitting using data of points included in the segment and the point cloud data, and a multi-primitive fitting device that performs the method. | 07-30-2015 |