US Patent 7705918 Noise reduction apparatus and noise reduction method

According to one embodiment, a noise reduction apparatus includes a frame delay module, first and second impulse noise detectors, first and second impulse noise reducers, a motion detector, and a noise reducer. The frame delay module delays a video signal by one frame to obtain a frame delay video signal. The first and second impulse noise detectors detect impulse noise in the video signal and the frame delay video signal. The first impulse noise reducer generates a current frame video signal by reducing the impulse noise in the video signal. The second impulse noise reducer generates a previous frame video signal by reducing the impulse noise in the frame delay video signal. The motion detector detects motion amount from the current and previous frame video signals. The noise reducer reduces noise other than the impulse noise in the current frame video signal based on the motion amount.