| 摘要 |
<p>This specification discloses a motion detection method for detecting with high accuracy only true motion from an input video signal (101) of a moving image with reduced effects of noise and flicker, and also discloses a noise reducer for reducing noise with little after image by using the above-mentioned motion detection method. The motion detection method according to the present invention comprises the steps of determining motion by comparing a difference signal between an input video signal (101) and a video signal of the previous frame with a predetermined threshold value and/or detecting motion by using said difference signal for a target pixel and surrounding pixels around the target pixel, correcting an error of a result of motion detection, and detecting a motion-to-still transition period of motion from a motion detection result of the corresponding pixel of the previous frame. By using the above-mentioned motion detection method, the noise reducer of this invention has a motion detection circuit (106) for deciding the still image mode, the moving image mode or the motion-to-still transition period mode for data of each pixel in the input video signal (101), and performs adaptive control of a non-linear circuit (109) according to the mode decided. By this control method, noise reduction can be achieved with reduced after image in the moving image part. <IMAGE></p> |
