Patents Assigned to Vistek Electronics Ltd.
  • Patent number: 6333764
    Abstract: A video signal decoder including a comb filter characterised by means for changing the operating mode of the filter progressively. Also, a video signal decoder including a comb filter characterised by means for adjusting continuously the degree of filtering performed by the filter. In one arrangement the decoder comprises an input filter and two signal multipliers wherein one of the multipliers is connected to receive a signal output by the input filter and the other multiplier is connected to receive a signal output by the comb filter wherein operation of the multipliers is mutually interdependent.
    Type: Grant
    Filed: May 17, 1999
    Date of Patent: December 25, 2001
    Assignee: Vistek Electronics Ltd.
    Inventors: Roger Neil Robinson, Roy Steinar Sutherland
  • Patent number: 5703650
    Abstract: The method described enables a high accuracy of motion measurement to be achieved with simple circuitry and overcomes some of the most important sources of error introduced in other systems. Many of the previous techniques may be extended by using a hierarchical technique to improve the accuracy or resolution of a simple estimator e.g. hierarchical block matching or successive approximate gradient systems. The invention described in this patent introduces novel techniques of weighted-sample area matching, effectively giving soft boundaries to the picture areas used to assess motion within a picture, and/or with a technique of adjusting the picture resolution between successive stages of motion measurement. The combination of these techniques reduces many of the limitations of previous techniques.
    Type: Grant
    Filed: October 31, 1995
    Date of Patent: December 30, 1997
    Assignee: Vistek Electronics Ltd.
    Inventor: Roger N. Robinson