超声波的声强对污油脱水量有直接影响，超声波脱水的声强应在临界阈值以下；
The acoustic intensity of the ultrasonic and the demulsifier dosage had significant influence on dehydration;
针对图像背景噪声强的特点，提出了一种基于感兴趣区域(ROI)的结构光条纹中心处理方法，即在ROI内用最大类间方差法进行阈值分割再用重心法进行细化。
Aim at removing the background noise in the large measuring range system (about 2m), a method which combines Otsu based on ROI and gray barycenter method is proposed.
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