Image recording method and apparatus with reduced error propagat

Details Image recording method and apparatus with reduced error propagat Image recording method and apparatus with reduced error propagat

1993-08-19

1996-12-31

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Record copying

360 53, G11B 586, G11B 509

Patent

active

055899943

ABSTRACT:
According to a first aspect of the invention, digital image data are recorded in the form of compressed codewords with check information and flags. The flags indicate codewords containing uncorrected errors. Each time the data are copied, error detection and correction are performed and the flags are updated to indicate any new uncorrectable errors that are detected. The flags can be used for error concealment, to avoid error miscorrection, and to permit the check information to be regenerated each time the data are copied. According to a second aspect of the invention, when image data are copied, the same check information is used to perform error detection and correction twice. Flags identifying uncorrected errors can be transferred from the first error-detecting-and-correcting process to the second.

REFERENCES:
patent: 5084788 (1992-01-01), Hatanaka et al.
patent: 5267094 (1993-11-01), Aoki
patent: 5299208 (1994-03-01), Blaum et al.
patent: 5309292 (1994-05-01), Takakura

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