Method of compensating for turbulence when recording film sequences

摘要

A method of compensating for atmospheric turbulence when recording film sequences. A frame for an image that is being currently recorded is compared at pixel level with a number of frames recorded earlier. Each pixel value in a current frame is compared with pixel values in earlier frames. A matrix is adjusted upward by one unit at positions where a new value is encountered at the positions. Values adjusted upwards in the matrix are retained for a limited number of frame comparisons. A summing window is drawn over the matrix and movement is deemed to have occurred in areas where a sum from the summing window exceeds a limit value. A compensated frame is created. All pixel values in areas where the summing window exceeds the limit value are derived from the current frame. Other values are derived through a temporal median filtering of a number of earlier frames recorded.