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利用电视ＰＡＬ制式的隔行扫描原理，把摄像机拍摄的一幅图象拆分为前后两场，经过最小误差示踪粒子匹配方法的图象处理，获得了较好的瞬时流矢图．
Using the interlacing principle of the TV PAL system, an image taken by the camera is split into two fields before and after. Through the image processing of the least error tracing particle matching method, a better instantaneous flow vector diagram is obtained.