| 摘要 |
<p>The invention relates to a device and a method for estimating the noise level of a video signal representing image sequences. The device comprises: movement compensated interpolation means (2), a recursive filter (1) designed to receive on a first input the output (r(x,y,t)) of the recursive filter movement compensated by the movement compensated interpolation means (2) and on a second input the video signal (10), means (9) of calculating the difference between the video signal (10) and the output (r(x,y,t)) of the recursive filter (1) movement compensated by the movement compensated interpolation means (2). <??>According to the invention, the device comprises means (4) of estimating the noise level ( sigma ) of the video signal (10) according to said difference and a maximum threshold (Sc) delimiting this difference. <??>Application to pre-video compression noise reduction devices. <IMAGE></p> |
