our multichannel filter

Conclusions: In this Letter, I have presented a resistive network using a feedback mechanism able to extract phase information from an image for depth evaluation. The information, related to a single frequency, can be properly organised by a further network, or the resistive network itself can be tuned to a more complex behaviour (e.g. regularisation of data). The design of this network makes sense if we can integrate the acquisition and elaboration processes on the same substrate (i.e. analogue VLSI implementation). To this end, the complexity of the operations has been reduced to a small number of primitives that can be implemented, as a first approximation, by low-power analogue VLSI techniques 141.