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Caption display method for using digital video system

  • US 5,999,225 A
  • Filed: 08/01/1996
  • Issued: 12/07/1999
  • Est. Priority Date: 08/02/1995
  • Status: Expired due to Fees
First Claim
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1. An encoding apparatus for generating a multiplexed bit stream, comprising:

  • means for encoding a dynamic image signal so as to form a video bit stream;

    means for encoding superimposed data so as to form bit map data;

    means for encoding said bit map data and region coordinates of a plurality of regions of a first page so as to form a bit stream of each respective region;

    means for encoding the bit stream of each of said regions and page coordinates of a page layer, said page coordinates being associated with said region coordinates, so as to form a bit stream of a page layer wherein said page coordinates establish a display area where said first page is displayable to enable a decoding apparatus which is responsive to an external page movement command, to determine a superimposed data display position by determining a movement offset on the basis of the page movement command, and clipping the movement offset based on the determined movement offset and the page coordinates, such that each of said regions is always displayed on a display even if the determined movement offset is operative to move a smaller, second page to a periphery of the display, and would otherwise move a portion of the first page off the display; and

    multiplexing means for multiplexing the bit stream of said page layer and said video bit stream into a multiplexed bit stream.

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