Real time video perspective digital map display method
First Claim
Patent Images
1. A method for storing and retrieving digital information in a system producing a perspective display, comprising the steps of:
- storing digital data representing a two-dimensional pattern of elevation information in addressable memory locations of a memory;
generating signals representing the parameters of the desired perspective display including the height and location of the viewing point and the angle of the display with respect to the two-dimensional pattern;
reading elevation data from selected addressable memory locations of said memory through the generation of address signals and applying said address signals to said memory; and
transforming the address of each elevation data read out of said memory from the address of that point in the two-dimensional pattern to the address of a respective pixel position in the perspective display.
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Abstract
A digital system for producing a real-time visual display in perspective of the terrain over which an aircraft is passing on the basis of compressed digital data stored on a cassette tape includes a perspective processor for transforming the addresses of points in a two-dimensional data pattern to the addresses these points occupy in a three-dimensional scene and for a filing in points between the transformed points to provide a complete display of the terrain in perspective.
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Citations
42 Claims
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1. A method for storing and retrieving digital information in a system producing a perspective display, comprising the steps of:
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storing digital data representing a two-dimensional pattern of elevation information in addressable memory locations of a memory; generating signals representing the parameters of the desired perspective display including the height and location of the viewing point and the angle of the display with respect to the two-dimensional pattern; reading elevation data from selected addressable memory locations of said memory through the generation of address signals and applying said address signals to said memory; and transforming the address of each elevation data read out of said memory from the address of that point in the two-dimensional pattern to the address of a respective pixel position in the perspective display. - View Dependent Claims (2, 3, 4)
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5. A method for storing and reading out digital information use in generating a perspective display of terrain over which a vehicle is moving on the basis of digital data representing a two-dimensional elevation terrain pattern which is addressable in relation to the coordinate position of each point in said terrain pattern, comprising the steps of:
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storing said elevation data representing at least a portion of the terrain pattern of the terrain over which the vehicle is passing in memory; providing signals representing the angle of heading of said vehicle with respect to a fixed geographical orientation, the angle of the perspective display with respect to said two-dimensional elevation terrain pattern, and the elevation and current position of said vehicle with respect to said terrain; reading elevation data out of said memory through the generation of address signals and the application of said address signals to said memory; and transforming, in response to said provided signals, the address of each point read out of said memory from the address of the point in the two-dimensional terrain pattern to the address of a respective pixel position in said perspective display. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method for generating a perspective display of terrain over which a vehicle is moving, comprising the steps of:
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storing, in memory, digital data representing a two-dimensional elevation terrain pattern which is addressable in relation to the coordinate position of each elevation point with respect to a selected geographical orientation; providing signals representing the heading angle of said vehicle with respect to said selected geographical orientation, the angle of the desired perspective display with respect to said two-dimensional elevation terrain pattern, and the elevation and current position of said vehicle with respect to said terrain; reading-out of memory, in response to said provided signals, elevation data for respective ones of said elevation points through the generation of address signals and the application of said address signals to said memory; in response to said provided signals, transforming the address of each point read out of said scene memory from the address of that point in memory to the address of a respective pixel position in said perspective display; storing the elevation data read out of said memory in a matrix of memory positions in a display memory, which form storage locations corresponding to said transformed addresses; and displaying the elevation data stored in said display memory to produce said perspective display. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for storing and reading out digital information for use in generating a real-time perspective display of terrain over which a vehicle is moving on the basis of stored digital data representing a two-dimensional elevational terrain pattern and signals indicating the instantaneous heading, geographic location and elevation of the vehicle and the desired angle of view of the resultant perspective display, comprising the steps of:
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storing in a scene memory said digital data in addressable coordinate positions related to a selected geographic orientation of the terrain; in response to signals representing heading, geographic location and angle of view, reading data out of said scene memory through the generation of address signals to address a selected area of said scene memory on the basis of the heading and geographic location of the vehicle and the desired angle of view with respect to the terrain represented by said digital data; in response to signals representing heading, elevation, geographic location and angle of view, transforming the address of each data value read out of said scene memory from the address of its associated point in the two-dimensional terrain pattern to the address of a respective pixel in said perspective display; and in response to the transformed addresses, generating a real-time perspective display of said terrain. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification