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Video processing for composite images

  • US 5,459,529 A
  • Filed: 12/01/1989
  • Issued: 10/17/1995
  • Est. Priority Date: 01/10/1983
  • Status: Expired due to Fees
First Claim
Patent Images

1. An image composition system comprising:

  • a first input for first digital video image signals representing a first video image;

    first frame store means for storing a frame of said first digital video image signals;

    a second input for second digital video image signals representing a second video image;

    second frame store means for storing a frame of said second digital video image signals;

    a third input for third digital video image signals representing a first control image;

    third frame store means for storing a frame of said third digital video image signals;

    said third frame store means storing third digital video image signals having a first value for pixels of a composed image consisting of said first or said second digital video image signals output from one of said first and second frame store means, a second value for pixels of said composed image consisting of said first or of said second digital video image signals output from the other of said first and second frame store means, and respective intermediate values for pixels of the composed image consisting of respective proportions of the first and second digital video image signals output from said first and second frame store means;

    addressing means for writing and reading said first, second and third digital video image signals into and from selected addresses of the respective frame store means, said addressing means maintaining upon said reading a desired pixel relationship between said third digital video image signals representing said first control image and said second digital video image signals representing said second video image; and

    processor means for forming a composed image by;

    (i) selectively outputting the first or the second digital video image signals read from one or from the other of said first and second frame store means when the third digital video image signals representing said first control image have respectively one or the other of said first and second values; and

    (ii) combining and outputting the first and the second digital video image signals from said first and from said second frame store means in proportions dependent upon the values of the third digital video image signals representing said first control image when said third digital video image signals have said intermediate values;

    wherein said addressing means modify the spatial relationship of the second video image and the first control image represented by the second and third digital video image signals input at said second and third inputs relative to the first video image represented by the first digital video image signals input at said first input to cause said composed image formed by said processor means to show a smooth movement of a portion of said second video image defined by said first control image relative to said first video image due to said modifying of said spatial relationship by said addressing means, before a selection of said spatial relationship for storage of the composed image corresponding to said selection.

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