趙太新，韓  峰， 王彥平（內蒙古工業大學機械學院，內蒙古呼和浩特 010051）   摘  要：近年來，圖像處理在微小變形的測量中應用越來越廣泛，它具有方便靈活、對被測對象沒有任何傷害等優點，且只需對被測對象進行拍照，然后對圖像進行處理分析，利用亞像素法原理即可精密測量出試樣的微小變形。因此，利用AT89C51與CMOS圖像傳感器OV5017組成DMA方式數據采集系統，FT245BM虛擬USB口與PC機通訊，實現了對縱向和橫向兩個方向微小變形的無接觸精密測量，且精度高成本低。        關鍵詞：AT89C51單片機；OV5017CMOS圖像傳感器；DMA片內直接存儲；USB通訊；圖像匹配   中圖分類號：TP311      文獻標識碼：A     文章編號：1672-4984（2007）01-0062-03   Small distortion measurement system based on CMOS image sensor ZHAO Tai-xin， HAN Feng， WANG Yan-ping （School of Mechanical Engineering，Inner Mongolia University of Technology，Huhehote 010051，China）   Abstract：In recent years，the image processing has widely applied in precise measurement of small distortion. It has merit of being convenient and nimble and having no injury to measured object and so on. It only needs to take photographs to the measured object for processing and analyzing. Using sub-pixel image matching，the authors obtained the precise measurement of small distortion. In this way，by the data gathering system of DMA way compose of AT89C51 and the image sensor OV5017，virtual USB communication mouth of AT89C51and PC using FT245BM，they realized the precise measurement of small distortion in the two directions，longitudinal and the crosswise，with more precision，low cost and no damage to measured object of course.  Key words: AT89C51 single chip microcontroller；OV5017CMOS image sensor；DMA internal direct memory；USB communication；Image matching