METHOD AND SYSTEM FOR PRE-PROCESSING OF VIDEO SEQUENCES TO ACHIEVE BETTER COMPRESSION

摘要

Methods for pre-processing video sequences prior to compression to provide data reduction of the video sequence. After compression of the pre-processed video sequence, the bit rate of the pre-processed and compressed video sequence will be lower than the bit rate of the video sequence after compression but without pre-processing. Pre-processing may include temporal filtering where pixel values of successive frames are filtered when the difference in the pixel values between the successive frames are within high and low threshold values. The high and low threshold values are determined adaptively depending on the illumination level of a frame. Pre-processing may include spatial anisotropic diffusion filtering such as Perona-Malik filtering, Fallah-Ford filtering, or omni-directional filtering that extends Perona-Malik filtering to perform filtering in at least one diagonal direction. Pre-processing may also include performing filtering differently on a foreground region than on a background region of a frame.