Adaptive quantization using code length in image compression

Details Adaptive quantization using code length in image compression Adaptive quantization using code length in image compression

2005-04-19

2005-04-19

Mehta, Bhavesh M. (Department: 2625)

Image analysis

Image compression or coding

Quantization

C038S098000, C038S098000, C038S137000, C375S240240, C375S240200

Reexamination Certificate

active

06882753

ABSTRACT:
A method is adapted for compressing an image data block, and includes the steps of:(a) subjecting the image data block to discrete cosine transformation so as to generate discrete cosine transform data;(b) quantizing the discrete cosine transform data in accordance with a quantizer matrix that consists of an array of quantizing coefficients so as to generate quantized data;(c) encoding the quantized data using an entropy coding algorithm so as to generate an encoded bitstream; and(d) when the length of the encoded bitstream does not fall within a predetermined range, adjusting the quantizing coefficients in the quantizer matrix and repeating steps (b) and (c) until the length of the encoded bitstream falls within the predetermined range.

REFERENCES:
patent: 5530478 (1996-06-01), Sasaki et al.
patent: 5966470 (1999-10-01), Miyashita et al.
patent: 6173012 (2001-01-01), Katta et al.
patent: 20010012397 (2001-08-01), Kato
patent: 20020102027 (2002-08-01), Miyake et al.

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