1746-OBP8

1746-OBP8可工作在常規(guī)模式（Normal）或均勻模式（Uniform Regions）兩種模式下。當其工作在均勻模式下時，VI會假設(shè)圖像中目標區(qū)域和背景區(qū)域的像素值分別為一致的灰度值，這有助于提高VI的執(zhí)行效率。

通過使用IMAQ Extract Contour提取零部件工件輪廓的實例，了解其使用方法，程序設(shè)計思路如下所示：

程序一開始先將工件圖像Clamp.png讀入內(nèi)存，并指定圖像中的ROI區(qū)域；

進入主循環(huán)后，程序監(jiān)測曲線提取過程的參數(shù)及圖像顯示控件中繪圖事件（Draw），一旦有變化，程序就調(diào)用IMAQ Extract Contour從ROI中提取目標的輪廓，并由IMAQ Overlay Contour在圖像中標記出終選擇的目標輪廓。

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