摘要
In recent years, research on the automatic input of graphics became active, because researches in the fields of CAD, GIS (geographical information system), OA (office automation), etc. have raised high requirements for the graphic input of computers. But compared with the graphic output approach, the current graphic input approach is so limited that it cannot meet the needs of intelligent input.
基金
Project supported in part by the 863 Plan and in part by the National Natural Science Foundation of China
