Abstract: Techniques are disclosed for systems and methods to provide passage planning for a mobile structure. A passage planning system includes a logic device configured to communicate with a user interface associated with the mobile structure and at least one operational state sensor mounted to or within the mobile structure. The logic device determines an operational range map based, at least in part, on an operational state of the mobile structure and/or environmental conditions associated with the mobile structure. Such operational range map and other control signals may be displayed to a user and/or used to generate a planned route and/or adjust a steering actuator, a propulsion system thrust, and/or other operational systems of the mobile structure.

Abstract: Apparatuses, systems, and methods are provided for automatically selecting first and last frames for a sequence of frames from which an accumulation contrast image may be generated. In some examples, statistical distributions of groups of pixels of the image frames may be analyzed to generate parametric maps. The parametric maps may be analyzed to select the first and last image frames of the sequence. In some examples, an image frame corresponding to the parametric map having a value above a threshold value may be selected as a first frame. In some examples, an image frame corresponding to the parametric map having a maximum value of all the parametric maps may be selected as the last frame. In some examples, the parametric maps may be used to segment features, such as a tumor, from the image frame.

Abstract: A system for receiving positional information and displaying a virtual world based on the positional information. The system includes a base and a chair that may be rotated with respect to the base by the user of the system. A monitor is attached to the chair so that it moves with the chair. A measuring device determines the rotational position of the chair. Joysticks are provided, and the bases of the joysticks are attached to the chair or the monitor so that they move with the chair. Data from the joysticks and from the rotational-position measuring device are sent to a processor, which accesses a data base defining a virtual world and generates an image on the monitor. The monitor image represents apparent movement within and through the virtual world represented by the databases.