“…Many physical processes, such as image processing [4], signal filtering [5], and thermal processes in chemical reactors, heat exchangers and pipe furnaces [3], have a clear 2-D structure. The 2-D system theory is frequently used as an analysis tool to solve some problems, e.g., iterative learning control [6][7] and repetitive process control [8][9]. However, the analysis and synthesis approaches for 2-D systems can not simply extend from existing standard (1-D) system techniques because there are many 2-D system phenomena which have no I-D system counterparts.…”