Patent ID: 8576237

Claim:
A screen transfer apparatus that communicates with a screen display apparatus that displays image data on a screen, comprising: an image data generation unit configured to generate image data to be displayed on the screen, with a portion of said image data to be compressed and transferred; dictionary memories arranged correspondingly to a plurality of divided areas, each forming a different part of a whole area of the screen, wherein the dictionary memories each store dictionary data for a corresponding one of the divided areas; an area identification unit configured to identify overlapped divided areas that include the portion of said image data to be compressed and transferred; a division unit configured to divide the image data in each overlapped divided area in a vertical direction or a horizontal direction of the screen to generate pieces of divided image data for each overlapped divided area, a vertical width or a horizontal width of each piece is less than that of the corresponding divided areas; a data compression processor configured to compress each piece of the divided image data belonging to each of the divided areas by using to compress a piece of divided image data the dictionary data in a corresponding dictionary memory for the divided area in which that piece resides to generate a corresponding piece of compressed image data for each piece of divided image data, the data compression processor further configured to store each compressed piece of the divided image data belonging to each of the divided areas in each corresponding dictionary memory to update the dictionary data therein; and a data transmission unit configured to transmit the compressed image data belonging to each of the divided areas in an order defined by a rule given in advance.