Digital coding apparatus

Details Digital coding apparatus Digital coding apparatus

1996-01-11

2000-02-15

Moore, David K.

Image analysis

Image compression or coding

341 67, 348403, G06K 936, H03M 740, H04N 712

Patent

active

060261919

ABSTRACT:
A digital coding apparatus of the present invention consists of a transform circuit, a variable-length coding circuit, and a fixed-length data generating circuit. The transform circuit performs a discrete cosine transform with respect to inputted image data and generates a DCT coefficient from a DC coefficient and AC coefficients. The variable-length coding circuit codes the DC coefficient and AC coefficients to a DC code and AC codes. The fixed-length data generating circuit generates a leading item of fixed-length data from the above DC code and a leading portion of the above AC codes, while sequentially generating items of fixed-length data other than the leading one from the remaining portion of the above AC codes. Consequently, the process of storing the DC code in the fixed-length data and the process of storing the AC codes in the fixed-length data can be performed collectively by pipeline processing.

REFERENCES:
patent: 4593267 (1986-06-01), Kuroda et al.
patent: 5162795 (1992-11-01), Shirota

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