The diagram does not consider additional constraints: decreased resolution due to diffraction and increased susceptibility to fixed pattern noise with longer exposures.
图表没有考虑其他限制因素：衍射造成的低分辨率，长时间曝光带来的对固定图形噪声的敏感性。
For infrared optical systems a point spread function is calculated in terms of the spot diagram obtained through geometrical ray trace or the theory of Kirchhoff diffraction.
对红外光学系统，用几何光线追迹得到点列图或用基尔霍夫衍射理论计算得到点扩散函数。
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