Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2008-07-22
2008-07-22
Philippe, Gims (Department: 2621)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C382S261000
Reexamination Certificate
active
10640734
ABSTRACT:
Methods for pre-processing video sequences prior to compression to provide data reduction of the video sequence. In addition, 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. A temporal filtering method is provided for pre-processing of video frames of a video sequence. In the method, 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 video frame to provide variability of filtering strength depending on the illumination levels of a video frame.
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Dumitras Adriana
Normile James Oliver
Salsbury Ryan R.
Adeli & Tollen LLP
Apple Inc.
Philippe Gims
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