Image processing system

Details Image processing system Image processing system

1990-10-15

1992-10-13

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358135, H04N 7133

Patent

active

051555921

ABSTRACT:
An image signal (V1) is transform coded in a Discrete cosine Transform Coder (DCT) and the output coefficients thus provided are encoded in a zonal encoder (QZ). The output of QZ is inversely coded (IQZ) and substracted from the coefficients of the DCT. The resulting error is encoded in an entropy encoder. Both the zonal coder and the entropy encoder have quality inputs (TZQ, TEQ) controlling the compression factor, and have their outputs combined in a single compressed data stream (TXD3).

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Wang et al, "Progressive Image Transmission by Transform Coefficient Residual Error Quantization", IEEE Trans Communications, vol. 36 #1, Jan. 1988, pp. 75-87.
Gonsalves et al, "Bounded-error coding of cosine transformed images", Proc Soc Photo-Optical Instr Engrs (SPIE) vol. 207, Aug. 1979, pp. 291-298.
Shri K. Goval et al: "Entropy Coded Differential Pulse-Code Modulation Systems for Television" IEEE Transactions on Communications Jun. 1975, pp. 660-666.
Wen-Chen et al: "Adaptive coding of Monchrome and Color Images", IEEE Transactions on Communications, vol. Com-25, No. 11, Nov. 1977.

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