Compared with union inversion of amplitude and phase, similar results can be obtained with the single inversion of amplitude or phase.

与使用复电阻率幅值和相位的联合反演相比，单独考虑幅值或者相位的反演也能够取得相近的效果。

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But among the tasks the machine can perform in a single step are edge detection, inversion, the identification of lines and shapes of different orientations, and the filling-in of concave shapes all things that are useful in image-processing, and not all of which can be managed by digital technology.

ECONOMIST: Analogue computing