Logarithmic pre-amplifiers are
consistent with the |
where perception is constant for features having constant ΔI/I.
Aneuran IsInvariant is a circuit for logarithmic pre-amplification of
The latest IsInvariant pre-amplifier draws no significant current
and has no amplified noise.
Monochromatic cameras with IsInvariant pre-amplified pixels
will have contrast invariant HDR (High Dynamic Range).
Additional IsInvariant technology will enable
logarithmic color invariant HDR (color constancy).
Traces are from a variant on the circuit shown in Patent 7,796,173
and Patent Application (PDF Fig. 13)
SPICE trace from an Aneuran™ IsInvariant™ pre-amplifier|