Method for coding facsimiles
AssigneeSiemens Aktiengesellschaft
InventorWolfgang Postl
Life of this patent
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Abstract
A method for coding facsimiles which are acquired when scanning originals containing halftone areas. In order to eliminate moire and/or for the purpose of a data compression, a coding of the halftone areas corresponding to an unsharper imaging in comparison to the original is executed such that the so-called halftone raster is suppressed. The method provides that a detail area is defined with a respective halftone area and is coded with a "detail code". At least a remaining area of the halftone area is coded with an "unsharp code". The method offers the advantage of the possibility of an improved detail reproduction given simultaneous suppression of a moire and given a good data compression.
Claims55
A method for coding a facsimile acquired when scanning an original and which contains halftone areas H.sub.i where i is a running number of a respective halftone area within the facsimile to be coded, comprising the steps of:
- in order to substantially reduce moire and to achieve data compression, executing a coding of the halftone areas corresponding to an unsharp imaging in comparison to the original such that a so-called halftone raster is suppressed;
- defining a detail area Di within a respective halftone area H.sub.i and coding it with a detail code in a detail coding step;
- and
- at least a remaining area of the halftone area H.sub.i being coded with an unsharp code in an unsharp coding step.
A method for coding a facsimile acquired when scanning an original, halftone areas H.sub.i resulting where i is a running number of a respective halftone area within the facsimile to be coded, comprising the steps of:
- executing a coding of the halftone areas corresponding to an unsharp imaging in comparison to the original such that a so-called halftone raster is suppressed to substantially reduce moire;
- defining a detail area D.sub.i within a respective halftone area H.sub.i and coding it with a detail code;
- and
- at least a remaining area of the halftone area H.sub.i being coded with an unsharp code.
Dependencies are inferred from the claim text.