H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/50 (2006.01) G06F 17/14 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01)
Patent
CA 2053844
An image data processing apparatus for fast coding and reconstruction continuous-tone image data parallelly processes DCr 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 ccefficient 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 tranforming result as image data.
Fukuda Masahiro
Noda Tsugio
Fetherstonhaugh & Co.
Fujitsu Limited
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