Resistive fuses are key elements in weak string filters, which smooth out noise while detecting step edges inherent in original data. A resistive fuse is implemented by two pairs of floating-gate metal oxide semiconductor (MOS) transistors in a chip by a standard double poly complementary MOS process.

The weak rod can be realized by a very natural double layer network with feedback. While the second layer is linear, the first layer is significantly nonlinear. Elements associated with the first layer are called “synaptic fuses.” An MRF argument is used to eliminate the line variables. The network makes what is cut transparent when a crease or a step edge is present.