Image analysis – Image compression or coding – Gray level to binary coding
Patent
1996-01-11
1999-02-02
Lee, Thomas D.
Image analysis
Image compression or coding
Gray level to binary coding
382254, 382260, 358455, 358456, G06K 936, G06K 946, H04N 140
Patent
active
058675990
ABSTRACT:
A system for converting continuous tone values to output values controls adjacency effects by implementing a look up table which represents the continuous tone values as addresses in order to provide output patterns to a marking device. The output patterns, when rendered, have substantially the same densities as the corresponding continuous tone values. Alternatively, the look up table may store filter values of a filter which is used to filter the output values produced during conversion of continuous tone values to output values. The filter values are accessed by representing, as addresses, the output values corresponding to input values surrounding the input value undergoing filtering. As another alternative, the look up table may include a predetermined set of look up tables. Output values relating to previously converted continuous tone values neighboring a continuous tone value undergoing conversion are used to select one of the look up tables, and the continuous tone value undergoing conversion is used to address the selected look up table to retrieve an output value to which the continuous tone value undergoing conversion is converted.
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Michaelis A. John
Shively J. Thomas
Lee Thomas D.
R.R. Donnelley & Sons
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