摘要:
Methods, systems, and computer readable media for real-time 2D/3D deformable registration using metric learning are disclosed. According to one aspect, a method for real-time 2D/3D deformable registration using metric learning includes creating a catalogue of simulated 2D projection images based on a reference 3D image and a shape space of 3D deformations, where each entry in the catalogue is created by: applying to the reference 3D image a set of deformation parameters from the shape space of deformations; simulating a 2D projection of the result; associating the simulated 2D projection image with the deformation parameters used to create the simulated 2D projection image; and storing the simulated 2D projection image and associated deformation parameters in the catalogue. The method also includes receiving a 2D image, and, in response to receiving the 2D image: calculating a value of distance between the received 2D image and a simulated 2D projection image for each of the simulated 2D projection images in the catalogue; using the calculated distances to calculate weighting factors to be applied to the deformation parameters of each of the simulated 2D projection images in the catalogue; and calculating deformation parameters for the received 2D image based on the weighted deformation parameters in the catalogue. The calculated deformation parameters are then used to deform a 3D volume of interest to produce a 3D volume that represents the 3D layout of the tissue at the time that the received 2D image was acquired.
摘要:
A method includes obtaining a single training image from a set of training images in a data repository. The method further includes generating an initial tissue class atlas based on the obtained single training image. The initial tissue class atlas includes two or more different tissue class images corresponding to two or more different tissue classes. The method further includes registering the remaining training images of the set of training images to the initial tissue class atlas. The method further includes generating a quality metric for each of the registered images. The method further includes evaluating the quality metric of each of the registered image with a predetermined evaluation criterion. The method further includes identifying a sub-set of images from the set of training images that satisfy the evaluation criterion. The method further includes generating a subsequent tissue class atlas based on the identified sub-set of the set of training images.
摘要:
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Bestimmung eines Höhenprofils einer Fahrzeugumgebung mittels einer 3D-Kamera. Mit der 3D-Kamera wird mindestens ein Bild von der Umgebung des Fahrzeugs aufgenommen. Aus den Bilddaten der 3D-Kamera wird ermittelt, ob mindestens ein Sprung (7, 8) im Höhenverlauf (6) der Umgebungsoberfläche quer (2) zur Fahrtrichtung (1) des Fahrzeugs existiert.
摘要:
A system and method are provided for mapping spatial and temporal measurements of motion constrained objects in a scene, e.g., vehicles. The method comprises determining a location parameter, and/or other interesting properties, for each of a plurality of objects at a plurality of points over time; generating a vector field over location and time using the location parameters, to specify the motion of each object over time; deriving measurements for each object using velocities from the vector field for that object, as the object moves through the scene over time; and outputting both individual and aggregate object and object property flow for the plurality of objects. Combining the generated map with a network graph and/or network model can provide network flow insights useful for historic event analysis, network flow monitoring, and planning purposes.
摘要:
L'invention concerne une méthode de recalage d'image utilisant un critère de similarité basé sur l'information mutuelle. L'image à recaler est comparée à une pluralité de représentations de référence d'un objet, chaque représentation de référence étant constituée d'une pluralité de zones homogènes. On calcule l'information mutuelle entre l'image à recaler et chaque représentation de référence, sur l'ensemble des zones homogènes (120). Le recalage est donné par la représentation de référence correspondant à l'information mutuelle la plus élevée (130,140). L'invention est avantageusement appliquée à l'aide à la navigation d'un aéronef par recalage d'images obtenues au moyen d'un radar à synthèse d'ouverture.