Bit rate control through selective modification of DCT...

Details Bit rate control through selective modification of DCT... Bit rate control through selective modification of DCT...

2005-06-28

2005-06-28

Diep, Nhon (Department: 2613)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

Reexamination Certificate

active

06912255

ABSTRACT:
An encoder including a DCT transformator for receiving an image or video frame and performing DCT transformation upon a pixel block in a macroblock of the frame, thereby providing a matrix of DCT coefficients, a zig-zag matrix-to-vector converter for receiving the matrix of DCT coefficients from the DCT transformator and creating a one-dimensional vector of DCT coefficients, an analyzer for receiving the one-dimensional vector of DCT coefficients and classifying the macroblock according to a level of detail and edginess, a rate controller for receiving the classification information from the analyzer and selecting DCT filtering parameters, a DCT filter for receiving the DCT filtering parameters selection from the rate controller and implementing the DCT filtering parameters upon the frame, thereby providing a filtered DCT coefficient vector, a quantizer for quantizing the filtered DCT coefficient vector, and a compressor for compressing the quantized results.

REFERENCES:
patent: 5005076 (1991-04-01), Stroppina et al.
patent: 5686962 (1997-11-01), Chung et al.
patent: 5990955 (1999-11-01), Koz
patent: 6026190 (2000-02-01), Astle
patent: 6788347 (2004-09-01), Kim et al.

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