Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1991-10-18
1994-04-12
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
3582612, 3582613, 358430, 358433, H04N 1415, H04N 1417
Patent
active
053030583
ABSTRACT:
An image data processing apparatus for fast coding and reconstructing continuous-tone image data, parallelly processes DCT coefficients in pipelined quantization and dequantization. An image data compressing apparatus comprises an orthogonally transformer for obtaining a transform coefficient matrix by two-dimensionally orthogonally transforming continuous-tone image data, a quantizer for quantizing respective elements of a coefficient matrix, a signal producer for outputting the serial quantized coefficients by attaching a termination signal to the tail end, and a coder for outputting codes corresponding to significant coefficients. An image data reconstructing apparatus comprises a decoder for decoding input codes to the coefficient codes and succession length codes, a coefficient code reverter for reverting the coefficient codes into significant coefficients, a succession length code reverter for reverting the succession length codes into insignificant coefficient succession length, a memory for storing a data pair of a significant coefficient and an insignificant coefficient succession length, a dequantizer for obtaining appropriate transform coefficients by dequantizing significant coefficients in data pairs, and an inverse orthogonally transformer for two-dimensionally inverse-orthogonally transforming the transform coefficient matrix and for outputting the transforming result as image data.
REFERENCES:
patent: 5184229 (1993-02-01), Saito et al.
Fukuda Masahiro
Noda Tsugio
Coles Sr. Edward L.
Fujitsu Limited
Rogers Scott A.
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