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Methods and apparatus for generating a picture-in-picture digital television frame by inserting a mean-only frame into a full-size frame

  • US 5,361,098 A
  • Filed: 11/30/1992
  • Issued: 11/01/1994
  • Est. Priority Date: 11/30/1992
  • Status: Expired due to Term
First Claim
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1. An encoding/decoding method for generating a picture-in-picture digital television frame, comprising the steps of:

  • (a) converting a first analog television signal into a first digital frame comprising a first prescribed number of pixels;

    (b) deriving a mean-only frame from said first digital frame, said mean-only frame comprising a second prescribed number of pixels, wherein each of said second prescribed number of pixels represents an average of a corresponding group of pixels in said first digital frame;

    (c) subtracting said mean-only frame from said first digital frame and performing Vector Quantization;

    of the first digital frame having said mean-only frame subtracted therefrom, said first digital frame having said mean-only frame subtracted therefrom, in combination with said mean-only frame, being convertible to a full-size frame;

    (d) creating an insertion frame on the basis of said mean-only frame;

    (e) performing digitalization, mean removal and Vector Quantization or statistical coding on a second analog television signal to convert said second analog television signal into a second digital frame comprising a third prescribed number of pixels; and

    (f) inserting said insertion frame into said second digital frame, thereby generating a picture-in-picture digital television frame.

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