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Data processing apparatus to generate an alarm

  • US 9,836,933 B2
  • Filed: 08/27/2012
  • Issued: 12/05/2017
  • Est. Priority Date: 05/15/2007
  • Status: Active Grant
First Claim
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1. A method of testing an operation of a data processing apparatus configured for generating an alarm signal as a result of analysis of video data signals, the method comprising:

  • simulating one or more conditions in a scene by;

    receiving video data representing the scene;

    receiving a virtual test signal representative of one or more locations of a virtual object in said scene;

    setting data representing a horizontal size and a vertical size of the virtual object dependent upon said one or more locations of the virtual object in said scene; and

    overlaying the received video data with an image of the virtual object at said one or more locations determined from the virtual test signal to generate virtual test video data;

    analysing the virtual test video data and generating an alarm signal based on an output signal generated by said analysis;

    responding to user input to display in an image of a scene displayed on a display screen the virtual object representative of a real size object to establish a first datum position and to store data defining the first datum position;

    varying a size of the virtual object in the image responsive to the user input;

    storing the data representative of the horizontal size and the vertical size of the virtual object relative to the displayed image at the first datum position;

    displaying said virtual object at a second datum position in said image responsive to the user input and to store data defining the second datum position;

    varying the size of the virtual object on the display screen at the second datum position responsive to user input; and

    storing data representative of the vertical size and the horizontal size of the virtual object at the second datum position relative to the displayed image.

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