Mask producing method, image outputting device and computer readable recording medium
AssigneeRicoh Company, Ltd.
InventorsMasanori Hirano, Satoshi Ohuchi
Life of this patent
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Abstract
A mask is produced for converting multi-level image data into a halftone image through comparison with a threshold for each pixel. For this purpose, a dot pattern is determined on each of predetermined gray scale levels, and, the mask is created by the dot patterns obtained at the step, where the respective dot patterns are determined independently for every gray scale level.
Claims25
A method of producing a mask comprising threshold data for converting multi-level image data into a halftone image through comparison with a threshold for each pixel, comprising the steps of:
- a) determining a dot pattern on each of predetermined gray scale levels;
- and
- b) creating the mask by the dot patterns obtained at the step a),
- wherein said step a) determines the respective dot patterns independently for every gray scale level.
A method of producing a mask comprising threshold data for converting multi-level image data into a halftone image through comparison with a threshold for each pixel, comprising the steps of:
- a) determining a dot pattern on each of predetermined gray scale levels;
- and
- b) creating the mask by the dot patterns obtained at the step a),
- wherein said step a) comprises the step a1) of evaluating a distance between on-dots in the dot pattern,
- wherein said step a1) performs the evaluation on a specific direction with a weight applied thereto.
Dependencies are inferred from the claim text.