Image forming apparatus which forms an image based on bit map da

Details Image forming apparatus which forms an image based on bit map da Image forming apparatus which forms an image based on bit map da

1997-02-25

1999-07-13

Evans, Arthur G.

395114, 395115, B41B 1500

Patent

active

059238283

ABSTRACT:
An image forming apparatus which forms an image based on bit map data. A compressing circuit compresses the bit map data to generate compressed data by reversible compression, and the compressed data is then stored in a first storing unit, such as a frame memory. Then, a decompression circuit reads and decompresses the compressed data. The decompressed data can then be stored in a second memory unit, such as a FIFO memory. An amount of data stored in the second memory is detected and based on the amount of data detected, a controller controls reading of the compressed data by the decompression unit. Based on the detected amount of data stored in the second storing unit, the decompression unit can execute a non-reversible decompression operation in which data is omitted prior to being stored in the second storing unit. An image based on the decompression data from the second storing unit is then recorded. The omitted data can also be reintroduced onto a finally recorded image, so that the recorded image fully corresponds to the original image data.

REFERENCES:
patent: 5771340 (1998-06-01), Nakazato et al.

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