Image processing apparatus

Details Image processing apparatus Image processing apparatus

2005-08-23

2005-08-23

Wong, Allen (Department: 2613)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240000, C375S240010, C375S240020, C375S240120, C375S240260

Reexamination Certificate

active

06934330

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. Although the dip point of the normalized cumulated value [q] does not clearly exist, when the reliability of data is high, further using a normalized cumulated value [q+2] whose quantizer scale code is different by 2 from 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 used in the preceding encoding process.

REFERENCES:
patent: 5389973 (1995-02-01), Kitamura et al.
patent: 5742342 (1998-04-01), Jung
patent: 6111913 (2000-08-01), Murdock et al.
patent: 6163573 (2000-12-01), Mihara
Patent Abstracts of Japan 6 319112, Nov. 15, 1994.

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