Patents Assigned to VSD Limited
  • Smoke and flame detection
    Patent number: 7002478
    Abstract: A method of operating a computer for smoke and flame detection comprising the steps of: receiving digitised images of the region to be monitored; comparing pixels of one of said images with pixels of another said image according to two predetermined procedures to produce a flame present decision and a smoke present decision; and providing a fire detected signal according to said smoke present and flame present decisions.
    Type: Grant
    Filed: February 7, 2001
    Date of Patent: February 21, 2006
    Assignee: VSD Limited
    Inventors: Ian Frederick Moore, Edward Grellier Colby, Michael John Black
  • Fire detection algorithm
    Patent number: 6956485
    Abstract: A method and apparatus for the detection of flame by entering (S1) a video signal into an algorithm which processes individual pixels in (S2) a frequency band is determined and used as a filter (S3) applies a threshold to create a map of significant movement (S4) applies an awareness map (S5) a number of parameters are calculated to decide whether flame is present in the video images being processed (S6) applies further filtering before indicating an alarm registering the presence of a flame threat.
    Type: Grant
    Filed: September 27, 2000
    Date of Patent: October 18, 2005
    Assignee: VSD Limited
    Inventors: Robert Frederick Aird, Edward Grellier Colby, Michael John Black
  • Smoke detection
    Patent number: 6844818
    Abstract: A smoke detection system comprising video camera monitoring means, video frame comparison means, signal processing means, and alarm generating means dependant on an output from the signal processing means; the signal processing means being arranged to analyse successive frames acquired by the video camera monitoring means and to compare the intensity and/or colour of individual pixels or group of pixels so as to consider the overall characteristics and inter-relationships of these pixels so as to detect the presence of smoke characterised in that the signal processing means analyses a plurality of different types of change in the said characteristics and inter-relationships.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: January 18, 2005
    Assignee: VSD Limited
    Inventor: Henry Joseph Grech-Cini
  • Smoke detection
    Publication number: 20020024446
    Abstract: A smoke detection system comprising video camera monitoring means, video frame comparison means, signal processing means, and alarm generating means dependant on an output from the signal processing means; the signal processing means being arranged to analyse successive frames acquired by the video camera monitoring means and to compare the intensity and/or colour of individual pixels or group of pixels so as to consider the overall characteristics and inter-relationships of these pixels so as to detect the presence of smoke characterised in that the signal processing means analyses a plurality of different types of change in the said characteristics and inter-relationships.
    Type: Application
    Filed: April 20, 2001
    Publication date: February 28, 2002
    Applicant: VSD LIMITED
    Inventor: Henry Joseph Grech-Cini