Patent ID: 7477298

Claim:
A correction circuit for an image pixel, comprising: a signal circuit, said signal circuit comprising a signal generator for generating a correction signal and a switch for controllably supplying said correction signal to an output of said pixel; and a detection circuit for detecting a predetermined low voltage condition in a reset signal component of said output of said pixel and for controlling said switch to cause said switch to supply said correction signal to said output of said pixel only when said predetermined low voltage condition is detected by said detection circuit, said detection circuit comprising: a comparator having a first input coupled to said output of said pixel and a second input coupled to a reference voltage, said comparator outputting a first control signal in a first state when a voltage of said reset signal component is less than said reference voltage; and a logic gate having one input accepting said first control signal and another input accepting a second control signal, said logic gate outputting a third control signal for controlling a state of said switch.