Memory management in event recording systems

  • US 9,226,004 B1
  • Filed: 11/03/2014
  • Issued: 12/29/2015
  • Est. Priority Date: 12/08/2005
  • Status: Active Grant
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First Claim
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1. A vehicle event recorder configured to be mounted in a vehicle, the vehicle event recorder comprising:

  • a video camera having a field-of-view that includes an environment about the vehicle, the video camera configured to acquire consecutive frames of visual information representing the environment about the vehicle;

    a buffer memory configured to electronically store the consecutively acquired frames of visual information;

    a long term storage memory configured to selectively store a subset of frames of the consecutively acquired frames of visual informationone or more sensors configured to generate output signals conveying information related to vehicle events; and

    a controller configured to;

    effectuate storage of the consecutively acquired frames of visual information in the buffer memory;

    facilitate interleaved overwriting of less valuable individual frames of the consecutively acquired frames of visual information stored in the buffer memory with additional frames acquired by the video camera, wherein value of individual frames of the consecutively acquired frames decreases;

    i. with increasing time away from a time of a given vehicle event, andii. with presence of one or more adjacent frames in the consecutively acquired frames that convey substantially similar visual information;

    detect the given vehicle events based on the output signals; and

    responsive to detecting the a given vehicle event, transfer the frames of visual information stored in the buffer memory to the long term storage memory, the transferred frames of visual information including frames of visual information for a period of time that begins before the given vehicle event and lasts until after the given vehicle event.

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