Image data compression

Details Image data compression Image data compression

2005-11-08

2005-11-08

Kelley, Chris (Department: 2613)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

Reexamination Certificate

active

06963609

ABSTRACT:
A method and a device are provided, in which a signal is encoded to obtain a bit-stream. Blocks of quantized transform coefficients are provided. Transform coefficients corresponding to higher frequencies are attenuated more than coefficients corresponding to lower frequencies. For attenuating higher-frequency coefficients, the invention provides a curve (QC) with higher quantization step-size (QADD) for transform coefficients (Ci) corresponding to higher frequencies. Because this additional quantization step size (QADD) is put in the resulting bit-stream, the reconstruction is performed with an original quantization step-size, without taking the additional quantizing into account. Therefore, a reconstructed coefficient will have a lower value than an original coefficient (Ci). Bit rates can easily be regulated by shifting the curve (QC) to lower or higher frequencies and/or multiplying the curve (QC).

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patent: 6567562 (2003-05-01), Nakayama et al.
patent: 6763070 (2004-07-01), Lee

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