Caption data coding/decoding systems and methods that includes key data indicating intermediate levels of attenuation in the vicinity of the caption

  • US 5,583,577 A
  • Filed: 04/03/1995
  • Issued: 12/10/1996
  • Est. Priority Date: 06/30/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A caption coding method for coding a caption, represented by caption data, to be superimposed on a video image for display, comprising:

  • coding the caption data representing the caption to be superimposed on the video image for display;

    coding key data to have a value corresponding to one of a maximum attenuation rate, a minimum attenuation rate, and one or more intermediate attenuation rates between the maximum attenuation rate and the minimum attenuation rate, of portions of the video image in a vicinity of the caption; and

    combining the coded caption data and the coded key data with video image data that represents the video image, to generate a combined image signal.

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