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Image data display system

  • US 5,150,462 A
  • Filed: 11/16/1989
  • Issued: 09/22/1992
  • Est. Priority Date: 06/27/1986
  • Status: Expired due to Term
First Claim
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1. An image data display system comprising:

  • a file unit for storing a plurality of variable length image data in compressed form;

    a display unit having a display screen for displaying image data;

    table means for storing address information of a plurality of image data to be read from said file unit;

    a buffer memory having a plurality of memory areas corresponding to at least two image frames for temporarily storing compressed image data read out from said file unit;

    means for expanding compressed image data read out from one of the memory areas of said buffer memory;

    a bit map memory having at least two image frame memory regions for storing expanded image data to be displayed on said display screen;

    means for outputting expanded image data in either one of said two image frame memory regions of said bit map memory to the display unit;

    input means for inputting from a user a first command instructing a successive display of image data and a second command instructing a halt of the successive display; and

    control means responsive to said first command for automatically switching between at least first and second memory areas of said plurality of memory areas and between said two image frame memory regions of said bit map memory in a predetermined order, respectively, such that said first memory area of said buffer memory is used for storing compressed image data read out from said file unit and said second memory area of said buffer memory and one of said at least two image frame memory regions of said bit map memory are used by the expanding means, and for successively reading out image data from said file unit to said first memory area by referring to said table means while said means for outputting expanded image data is displaying the contents of the other of said two image frame memory regions of said bit map memory on said display screen and said expanding means is processing compressed image data in said second memory area to write expanded image data into said one region of said bit map memory, and responsive to said second command for halting said automatic switching operation of the memory areas and frame memory regions and said successive reading operation of image data from said file unit,whereby a desired image data on the display screen is rendered by said control means to stay on the display screen in response to the second command inputted by said user from said input means during when a plurality of frames of image data are successively displayed on the display screen.

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