System for producing pixel image data from CCITT encoded pixel d

Details System for producing pixel image data from CCITT encoded pixel d System for producing pixel image data from CCITT encoded pixel d

1989-10-10

1990-11-06

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

3582613, H04N 100, H04N 141

Patent

active

049681354

ABSTRACT:
An image decoding apparatus including a Huffman decoder for decoding CCITT-encoded image information encoded in both one-dimensional and two-dimensional encoding to sequentially generate individual symbols each associated with a pixel run. A relative address decoder receives each symbol from the Huffman decoder and generates, in response thereto, an item of run length information and a color value representing the color of the pixel run. Finally, a run length decoder sequentially receives the successive items of run length information and uses them in generating sequential words for transmission to, for example, a display device. The run-length decoder iteratively receives run-length information comprising a length value and a data value and generates in response thereto a series of fixed-length data words of predetermined length. The run-length decoding apparatus includes a run pointer control circuit and a data word creator circuit. The pointer control circuit generates, in response to each item of run-length information, a pointer identifying the end, within the data word, of a run. In response to each pointer, the data word creator circuit inserts into the word data bits representative of the data value. The pointer control circuit and data word creator circuit operate iteratively to generate successive data words as the sequential items of run-length information are received.

REFERENCES:
patent: 4212036 (1980-01-01), Nakagome et al.
patent: 4571634 (1986-01-01), Caneschi
patent: 4626921 (1986-01-01), Ohtani et al.
patent: 4716471 (1987-01-01), Yokomizo

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