Method and apparatus for writing and protecting against random a

Details Method and apparatus for writing and protecting against random a Method and apparatus for writing and protecting against random a

1995-06-07

1998-07-07

Elmore, Reba I.

Excavating

371 371, H03M 1300

Patent

active

057780110

ABSTRACT:
A method and apparatus for encoding and detecting data which can be represented in a physical array of modules recorded on a medium. Information is encoded in "image-blocks". An image-block comprises a plurality of "sub-blocks". Sub-blocks comprise a plurality of "modules". A module is the smallest unit of information within the image-block. Discrete contiguous portions of each sub-block of an image-block taken together are encoded into an outer codeword. A plurality of these outer codewords are generated and recorded across each sub-block. A portion of the information that is to be recorded within each sub-block is encoded in a plurality of inner error detection and correction codewords, each preferably stored entirely within one corresponding sub-block. Accordingly, small scattered random errors can be corrected locally by using information entirely contained within the sub-block. If a large area within a sub-block is corrupted, the information contained in each other sub-block may be used to reconstruct the data that was recorded in the corrupted sub-block. The inner codewords are "interleaved" to provide a maximum distance between parts of the same codeword.

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Pavlidis, "Information Encoding with Two-Dimensional bar Codes", IEE, Computer, Jun. 1992.

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