增加清晰度测试可重复性的五个方法
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ZHEILIYOU5GEJIQIAOLAIXIANZHICESHIJIEGUOZHONGDEZAOSHENG:
最大化您的样品
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通过图表对比确保足够的信号水平(但不要太多)
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请注意处理图像的效果
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确保更好的曝光
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- 通过增加光源的亮度来增加图表反射的光量
- 只要照相机和目标都是静止的,就增加曝光时间以聚集更多光线
选择一个可重复的测量
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- MTF10 ,MTF30 和MTF50 :MTF曲线分别达到其归一化(DC)值的10%,30%和50%的频率值
- MTF50P :MTF曲线达到其最大值的50 倍的频率值(如果存在锐化,则可以大于在DC中找到的值1)
- 在1/4和1/2奈奎斯特时的MTF:在奈奎斯特采样速率的一半和四分之一处的MTF值(分别为0.125和0.25个周期/像素)。
- MTF面积:从DC到0.5个周期/像素的MTF曲线下的面积,通常曲线归一化到峰值为1(不太常见)。
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