Patent ID: 7705918

Claim:
A noise reduction apparatus comprising: a frame delay module configured to, upon receiving an input video signal in frame units from outside, delay the input video signal by one frame to obtain a frame delay video signal; a first impulse noise detector configured to generate a frame difference signal by subtracting the frame delay video signal from the input video signal and detect an impulse noise component in the frame difference signal; a second impulse noise detector configured to generate a frame difference signal by subtracting the input video signal from the frame delay video signal and detect an impulse noise component in the frame difference signal; a first impulse noise reducer configured to generate a current frame video signal by reducing the impulse noise component in the input video signal based on a detection result obtained by the first impulse noise detector; a second impulse noise reducer configured to generate a previous frame video signal by reducing the impulse noise component in the frame delay video signal based on a detection result obtained by the second impulse noise detector; a motion detector configured to detect motion in video from the current frame video signal and the previous frame video signal to obtain a motion amount indicating an amount of the motion; and a noise reducer configured to perform noise reduction on the current frame video signal to reduce noise components other than the impulse noise component with intensity corresponding to the motion amount to generate a noise-reduced video signal.