Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2006-07-11
2006-07-11
Wong, Allen (Department: 2621)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240000, C375S240010, C375S240020, C375S240120, C375S240260
Reexamination Certificate
active
07075983
ABSTRACT:
A quantizer scale value is detected with high accuracy. The number of effective samples of results of which DCT coefficients are quantized with each of quantizer scale values Q=1 to 31 is counted. In addition, fractional parts of quantized values are cumulated. When the number of effective samples of a cumulated value does not satisfy a predetermined value, the cumulated value is not used. When a dip point of a considered normalized cumulated value [q] quantized with the number of effective samples corresponding to each of the quantizer scale values Q clearly exists, using the relation between the normalized cumulated value [q] and normalized cumulated values [q−1] and [q+1] whose quantizer scale codes are immediately preceded and immediately followed by the quantizer scale code of the normalized cumulated value [q], it is determined whether or not the quantizer scale value Q corresponding to the normalized cumulated value [q] is a quantizer scale value Q used in the preceding encoding process.
REFERENCES:
patent: 5389973 (1995-02-01), Kitamura et al.
patent: 5742342 (1998-04-01), Jung
patent: 6091767 (2000-07-01), Westerman
patent: 6111913 (2000-08-01), Murdock et al.
patent: 6163573 (2000-12-01), Mihara
Kuramura Izumi
Sugiyama Akira
Frommer William S.
Frommer & Lawrence & Haug LLP
Sony Corporation
Wong Allen
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