Reconstruction device for compressed binary image data

Details Reconstruction device for compressed binary image data Reconstruction device for compressed binary image data

1996-10-16

1999-09-14

Coles, Edward L.

Image analysis

Histogram processing

For setting a threshold

395115, 395114, 382232, 358432, 358433, B41B 1500, G06K 936, H04N 1415

Patent

active

059535016

ABSTRACT:
A CPU converts data received from a host device into binary image data and compresses the data, and thereafter writes the compressed data into an image buffer in a RAM. In this compression, a method is employed in which, in a manner similar to the Huffman code compression method, an attention-directed byte is compressed on the basis of a correlation between the byte and a preceding byte. The compressed image data are DMA-transferred to a reconstruction/smoothing circuit. The reconstruction/smoothing circuit is configured by adding logic circuits for reconstruction to a smoothing circuit known in the conventional device, and reconstructs the compressed data by using a circuit which is in the smoothing circuit and which holds a preceding byte, or by referencing the held preceding byte.

REFERENCES:
patent: 3992572 (1976-11-01), Nakagome et al.
patent: 4058674 (1977-11-01), Komura
patent: 4315318 (1982-02-01), Kato et al.
patent: 5452405 (1995-09-01), Vondran, Jr.

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