4 results about "Absolute orientation" patented technology

The application relates to the technical field of marine orientation sensing of ships, and discloses a ship marine target sensing method and system based on machine vision, which comprises the following steps: using an AD-YOLOv9 algorithm to process incoming image information, obtaining position information and category information of a target image; establishing a coordinate system according to the position information of the target image, marking a target on the target image by using a target prediction box, determining the center point coordinates of the target prediction box based on a deep learning network to determine the center point coordinates of the target, and associating the bow of the ship to determine the absolute orientation and the relative orientation of the target; determining the position of the target relative to the reference point of the ship to determine the direction angle of the target; determining a straight line where the center point of the target and the reference point of the ship are located according to the direction angle of the target, and recording the straight line as a target direction line; calculating and formatting the angle label of the target according to the target direction line, and selecting a position on the target direction line to draw angle label information; and displaying the processed target image.

The invention discloses a stereophotography automatic absolute orientation method and device without sea surface control points and a medium, and the method comprises the steps: employing a left camera and a right camera to shoot the sea surface of the same area at the same time, and obtaining a sea surface image pair sequence; extracting feature points and matched homonymy points on the basis of the sea surface image pair sequence, calculating object point coordinates of the homonymy points in a camera coordinate system, fitting a plurality of object point coordinates to obtain a plurality of fitting planes, and summing unit normal directions of all the fitting planes to obtain a gravity direction; averaging the intercept of the z-axis of the camera coordinate system and all the fitting planes to obtain an average intercept; establishing a synthetic plane according to the gravity direction and the average intercept, and establishing an object space coordinate system based on the synthetic plane; determining a conversion relation between the camera coordinate system and the object space coordinate system, and calculating a distance average value from each object point of the object space coordinate system to the synthetic plane; and based on the distance average value, determining a stereophotogrammetry area according to a sea wave theory.

A method and system for determining a refined absolute position and refined absolute orientation of an entity in a navigation space is provided. The system includes a plurality of sensors, a coarse absolute position and orientation estimation unit to determine a coarse absolute position and / or a coarse absolute orientation, of entity based on a position data captured by sensors at predefined frequency / interval, a relative position and orientation estimation unit to determine a relative position and / or a relative orientation, of the entity based on a set of data captured from sensors, a navigation guidance unit to provide and update unique attributes of the navigation space, and an analytics unit to determine refined absolute position or refined absolute orientation of the entity by fine tuning: the coarse absolute position based on relative position and the coarse absolute orientation based on relative orientation using the navigation map.

The present application discloses a direction finding method, an apparatus and a system. The method comprises: a positioning device acquires first information, the first information being related to the following two items: an absolute direction of a target device, and direction information of the positioning device relative to the target device; and the positioning device determines direction information of the target device relative to the positioning device on the basis of the first information and second information, the second information being used for indicating an absolute direction of the positioning device. In the solution, a signal measurement process can be performed by the target device, so that the hardware design complexity of the positioning device can be reduced, the manufacturing costs of the positioning device can be reduced, the use costs of users can be reduced, the portability of the positioning device can be improved, and user experience can be improved. In addition, no additional hardware costs are required for the target device. The solution has a wide range of application and great commercial value.