So you have these two parameters, shutter speed and aperture size, both of which do essentially the same thing: control how much light gets in.
现在你已经了解了这两个参数——快门速度和光圈大小，他们从本质上来说有同一个功能：控制进入相机的光线总量。
Two configurable parameters control how VPSS operates.
两个可配置参数控制VPSS的运行方式。
But control code on Windows and requests on Linux are defined in such a different way that there is no fixed rule to find the mapping relations between these two parameters, as we discussed earlier.
但是Windows的控制代码和Linux的请求在定义上差别很大，以致没有固定规则能够找出这两个参数的映射关系，如前文所述。
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