Abstract: A digital system for removing, from a television signal, the electrical noise generated by faulty isolators from power lines. A thin horizontal segment noise detector locates possible noisy pixels (picture elements), and an image horizontal line verifier prevents false alarms given by the noise detector. An image corrector is provided to remove detected noise. The real time algorithm described in the invention is designed to provide a robust detector pseudo independent of noise waveforms, a memory window of three video delay lines, and a low cost digital hardware system.