当物体上没有零位移区域时，双曝光全息干涉图上便找不到零级条纹。
If there are no areas with zero-displacement on an object, there exist no zero-order fringes on the holographic interferograms.
而这个区域周围的地方则更擅长察觉位移、影子、光亮及黑白对比。
The area around the fovea is better at detecting motion, shadows, and stark, black and white contrasts.
此外，和下边的区域重叠的目的是通过设置不同层次相互垂直位移。
Moreover, overlapping of up and lower side for area is intended by setting vertical displacement with different level mutually.
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