Quote: undo algorithm for bitmap-based collaborative graphics; reduce space cost; uses timestamps, state vector, and quadtrees

Quotation Skeleton

Bitmap-based collaborative graphics editing systems are a special … … . we propose a new solution to resolve … The algorithm given in this paper can undo … time cost. … [p. 70] we adopt the well-known timestamp schema based … [refs], where delayed operations can be detected if operations from remote … [Record each operation with the affected region. Maintain a quadtree defining the overlap of each operation with other operations.]   Google-1   Google-2

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