Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1997-09-30
2000-02-29
Rogers, Scott
Facsimile and static presentation processing
Static presentation processing
Attribute control
358535, 358457, 358459, 358298, H04N 1405, H04N 152
Patent
active
060316276
ABSTRACT:
In a printer for printing an image by a distribution of dots having different densities per unit area or dots having different hues, the structure of the present invention accurately determines the on/off state of the different dots and ensuring high quality of printing. Recording ratios Rn and Rt of deep dots and light dots corresponding to input tone data DS in a target pixel are read from a map representing the relationship between the recording ratios and the tone data. The systematic dither method is adopted to determine formation or non-formation of a deep dot in the target pixel. This method compares the recording ratio Rn of deep dots with a threshold value Dref corresponding to the target pixel and read from a threshold matrix TM. In case that a deep dot is not formed, the recording ratio Rt of light dots is corrected by adding the recording ratio Rn of deep dots and subsequently compared with the same threshold value Dref to determine formation or non-formation of a light dot in the target pixel. The structure of the present invention uses only one threshold matrix to realize desired recording ratios without causing any over lap of deep dots with light dots. This structure is also applicable to dots having different hues. In this case, one threshold matrix is used to determine the on/off state of dots having different hues without causing any interference of the different hues.
REFERENCES:
patent: 4604654 (1986-08-01), Sakurada et al.
Rogers Scott
Seiko Epson Corporation
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