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Method and apparatus for continuously scrolling large scale picture

  • US 5,208,588 A
  • Filed: 04/10/1991
  • Issued: 05/04/1993
  • Est. Priority Date: 04/10/1990
  • Status: Expired due to Fees
First Claim
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1. A method for continuously scrolling a large scale picture, comprising the step of:

  • extracting a first partial picture of a part of the large scale picture from picture memory means storing a plurality of unit pictures, which form the large scale picture and are respectively corresponded to predetermined addresses;

    storing the first partial picture into a first partial picture memory means, said first partial picture having a region with a first position and a first size, which are relatively defined based on orthogonal coordinate axes of said large scale picture;

    reserving second partial picture memory means for storing a second partial picture having a second position and a second size, which are relatively defined based on the orthogonal coordinate axes of the large scale picture, said second position of said second partial picture being defined by parallel translation of said first position of said first partial picture, said second partial picture having a region overlapping said first partial picture;

    calculating a position and a size of the region where said first and second partial picture overlap each other, and those of a region where said first and second partial picture do not overlap each other;

    copying picture data of said first partial picture memory means corresponding to the region where said first and second partial pictures overlap each other, to a corresponding region of said second partial picture memory means;

    searching the unit pictures forming the region of said second partial picture which does not overlap said first picture based on the respective addresses of the plurality of the unit pictures forming said large scale picture;

    storing the searched unit pictures to the corresponding position of said second partial picture memory means and operating said second partial picture memory means in which all picture data to be stored are stored, in place of the operation of said first partial picture memory means; and

    displaying the content of said second partial picture memory means, thereby continuously scrolling the large scale picture.

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