Patents Assigned to Vistek Electronics Limited
  • Patent number: 5428399
    Abstract: Images may be stored on film or on one of the TV/video standards. Film comprises a sequence of frames each of which corresponds to the same point in time. Video, however, comprises a sequence of frames each comprising an interlace of 2 fields which successively scan the image and thus each field does not correspond to the same point in time.Due to these inherent differences, when converting from film to one of the TV standards and between the TV standards when at least part of the image originates on film, distortions are introduced particularly when there are any objects moving in the image.The present invention includes a vector motion estimator (10) providing motion vectors which are indicative of any objects moving and are used to manipulate the standards converter (8) so as to accommodate for the moving objects.
    Type: Grant
    Filed: April 15, 1992
    Date of Patent: June 27, 1995
    Assignee: Vistek Electronics Limited
    Inventors: Roger N. Robinson, Brian R. Mason
  • Patent number: 4992856
    Abstract: A color television decoder is provided for separating chrominance signals from a color video signal. The decoder has a variable two dimensional finite impulse response filter, comprising delay lines which provide signals representing an array of picture points around the picture point being imaged, and a variable combiner which linearly combines the signals with variable coefficients. A picture analyzer analyzes the picture and controls the variable coefficients so as to control the filter response to separate the chrominance signal. The luminance signal may be separated by subtracting the chrominance signal from the delayed color video signal.
    Type: Grant
    Filed: July 10, 1989
    Date of Patent: February 12, 1991
    Assignee: Vistek Electronics Limited
    Inventor: Roger N. Robinson