Image analysis – Image enhancement or restoration – Image filter
Reexamination Certificate
2003-08-13
2008-09-30
Patel, Kanji (Department: 2624)
Image analysis
Image enhancement or restoration
Image filter
C382S275000, C375S240290
Reexamination Certificate
active
07430335
ABSTRACT:
Methods for pre-processing video sequences prior to compression to provide data reduction of the video sequence. Also, 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 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 video frame. This method includes identifying pixel locations having pixel values matching characteristics of human skin and determining a bounding shape for each contiguous grouping of matching pixel locations. The foreground region is comprised of pixel locations contained in a bounding shape and the background region is comprised of all other pixel locations.
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Dumitras Adriana
Normile James Oliver
Salsbury Ryan R.
Adeli & Tollen LLP
Apple Inc
Patel Kanji
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