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Chroma-key tracking apparatus

  • US 4,628,363 A
  • Filed: 11/21/1983
  • Issued: 12/09/1986
  • Est. Priority Date: 11/19/1982
  • Status: Expired due to Term
First Claim
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1. A tracking apparatus for inserting a first television picture into a part of a second television picture to obtain a special effect, comprising:

  • means responsive to a second television signal which is indicative to said second television picture for generating a key signal which represents an area of a television frame of said second television picture which is occupied by said first television picture;

    noise eliminating means for removing from said key signal a picture noise component having a dimensional width which is less than a predetermined dimensional width value, said noise eliminating means measuring said picture noise component to determine the dimensional width thereof to produce a noise-free key signal;

    means responsive to said noise free key signal from said noise eliminating means for detecting a surrounding frame surrounding the boundary of said frame represented by said key signal;

    means responsive to said surrounding frame for producing an imaginary frame indicating a size to which a first television signal corresponding to said first television picture is to be compressed;

    means responsive to said imaginary frame for compressing said first television signal to the size of said imaginary frame; and

    means for inserting said compressed first television signal from said compression means into said second television signal corresponding to said second television picture in accordance with said key signal.

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