| 摘要 |
<p>The invention relates to an image processing method and device for removing high-frequency fixed pattern noise from a video sequence, wherein a sequence of incoming frames is saved when the relevant scene moves across the detector of a provided camera and a cumulative image of fixed pattern noise is formed from the saved image sequence and wherein an average is formed (4) from the sequence of incoming saved frames. The device is also capable of removing slowly varying spatio-temporal fixed pattern noise. This is achieved by a method comprising the steps of: (a) spatially high-pass filtering the formed average (7); (b) weighting the spatially high-pass filtered average pixel by pixel temporally with a metric of the difference between incoming saved frames (5, 8, 14); (c) weighting the spatially high-pass filtered average with the value of an edge metric of incoming saved frames (6, 9, 15); (d) storing (11) the weighted, spatially high-pass filtered average and subtracting (20) it from the video sequence.</p> |
