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提出了在使用五孔剪切相机研制二阶微分场时，通过采用两次全场滤波技术可消除夹在二阶微分条纹中的一阶微分条纹，从而使二阶微分条纹具有较高的对比度。
It is proposed that when using a five-hole shear camera to develop the second-order differential field, the first-order differential streaks in the second-order differential streaks can be eliminated by using two full-field filtering techniques so that the second-order differential streaks have higher contrast .