Image analysis – Image compression or coding – Transform coding
Reexamination Certificate
2007-06-19
2007-06-19
Chen, Wenpeng (Department: 2624)
Image analysis
Image compression or coding
Transform coding
Reexamination Certificate
active
10397120
ABSTRACT:
Reduced complexity inverse discrete cosine transform (IDCT) masks and a method for reducing the number of IDCT calculations in video decoding are provided. The method comprises: accepting an n×m matrix of DCT coefficients; performing (n−y) horizontal IDCT operations, where y is greater than 0; performing y scaling operations; and, generating an n×m block of pixel information. Some aspects of the method further comprise: performing (m−z) vertical IDCT operations, where z is in the range between 0 and m/2. In some aspects, performing (n−y) horizontal IDCT operations includes performing IDCT operations for the first (n−y) horizontal rows. Then, performing y scaling operations includes: selecting the DC component from the first position of each horizontal row; scaling the selected DC component; and, copying the scaled DC component into the remaining positions of each of horizontal row.
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Chen et al., “Regulated Complexity Scalable MPEP-2 Video Decoding for Media Processors”, IEEE Transactions on Circuits and Systems for Video Technology, vol. 12, No. 8, Aug. 2002, pp. 678-687.
Lei Shwmin
Sun Shijun
Chen Wenpeng
Ge Yuzhen
Law Office of Gerald Maliszewski
Maliszewski Gerald
Sharp Laboratories of America Inc.
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