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166 西安工业大学学报 第27卷 [3] Marianne Sheelagh Therese Carpendale.A Frame— Large Hierarchiesl,C].in CHI’95 proceedings,1995. work for Elastic Presentation Space -ID].Doctor’S 1-73 Alen Keahey T,Robertson Edward L Techniques for Thesis,School of Computing Science,Simon Fraser Non—linear Magnification Transformations -lc].In University,Bumaby,BC,1992. Proceedings of the IEEE Symposium on Information I- ̄1 Carpendle M。oCwperthwaite D。Fracchia D.3D Plia— Visualization,1996. ble Surface:For the Effective Presentation of Visual ,183 Alen Keahey T.Robertson Edward L Nonlinear Magni— Information[-C].In UIST’95 Proceedings,1995:217. fication Fieldsl,C].In Proceedings of the IEEE oCnfer— 1-53 Machinlay J D,Robertson G G,Card S K.The Per— ence on Information Visualizaion,1997. spective Wall:Detail and oCntext Smoothly Integrated [93 Donald Hearn,Pauline aBker M.计算机图形学I-M]. -Ic].Proceedings of the ACM oCnference on Human 蔡士杰,译.北京:电子工业出版社,1998. Factors in Computign Systems:CHI’91,1991:173. oDnald Hearn。Pauline Baker M Computer Graphics I-6]Lamping J,Rao R,Pirolli P.A Focus-{-Context Tech— -IM].Cai Si—jie Trans1.Beijing:Publishing House of nique Based on Hyperbolic Geometry for Visualizign Electronics Industry,1998.(in Chinese) Study of Nonlinear Magni fication Method Based on Bezier Transformation LUChang 。LI Li—gang (1.Department of Mathematics and Physics,Xi’an Technological University,Xi’an 710032,China; 2.Research Center of Space Science and Application,Chinese Academy of cSiences,Bering 100080,China) Abstract:The traditional magnification method,which destroys the continuum of the magnification region with non—magnification region.is not able to keep 1ocal detai1 and global context.A new nonlinear magnification method is proposed in this paper.The new method produces the effect of nonlinear magnification based on perspective proj ection and the curve is used as drop—off function.So the new method enhances the local information and meanwhile keeps the global context.It provides different representation by adj usting the distortion degree of nonlinear magnification especially.In this way,image interpretation and target recognition can be performed effectively. Key words: image interpretation;nonlinear magnification;perspective proj ection;Bezier curve (责任编辑、校对魏明明) 一… {简f …讯{, 空气静压轴承 空气静压润滑技术因其高精度、无摩擦等优良性能,已被普遍应用在高精密仪器设备 中.西安工业大学曾应用此技术为一些高校的211工程项tg设计制造了高精度的空气润滑 专用实验台.目前,自行研制开发的空气静压气垫有15种规格,均采用不锈钢、陶瓷化铝合 金等新型材料制成,已被多家三坐标测量机生产厂家采用.同时,还研制有空气静压主轴及 空气静压导轨组件,可为多种精密测量设备和精密加工设备配套改造、进行精度升级用. (李高宏)