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Image display system, image display method and program

  • US 9,689,688 B2
  • Filed: 03/27/2014
  • Issued: 06/27/2017
  • Est. Priority Date: 03/30/2010
  • Status: Active Grant
First Claim
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1. An image display system, comprising:

  • a position information obtaining device obtaining position information of a ship,an information storage device storing an electronic marine chart including seafloor shapes and a tide table,an image display device,an image providing device providing an image to the image display device, anda direction obtaining device obtaining the direction of the ship,wherein the image providing device is configured to;

    obtain a draft of the ship according to at least information related to cargo or a number of passengers of the ship stored in the information storage device and a depth below sea level at a position of the ship based on the position information of the ship obtained in the position information obtaining device, the tide table, and information related to depths indicated on the electronic marine chart,determine, based on the draft, whether a distance from a lowest part of a current position of the ship to the seafloor shape is within a predetermined distance range to avoid a collision,determine a visual field from the image display device based on position information of the image display device determined based on the position information of the ship obtained in the position information obtaining device, the direction obtained in the direction obtaining device, and a size of the image display device,create a virtual space image of a seafloor shape below sea level at the depth within the visual field based on the draft, the position information, the determined visual field, the depth below sea level, and seafloor topography image data indicated on the electronic marine chart, the virtual space image indicating a relationship between the distance and the predetermined distance range to avoid a collision, andprovide the virtual space image to the image display device, andwherein the image display device is configured to display the virtual space image of the seafloor shape by combining with a view from the image display device.

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