Memory device comprising coefficients for halftoning
AssigneeHewlett-Packard Development Company, L.P.
InventorsTerry M. Nelson, Mark Q. Shaw
Life of this patent
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Abstract
In some examples, a printing device component includes a memory device comprising compressed coefficients that, when decompressed by a printing device, form difference entries, wherein a difference entry of the difference entries represents a difference of a value of a corresponding entry of a halftone table and a value of a corresponding entry of a reference table. The memory device further includes healing parameter values specifying a healing process to apply to a reconstructed halftone table produced using the coefficients.
Claims19
A printing device component comprising:
- a memory device comprising:
- compressed coefficients that, when decompressed by a printing device, form difference entries, wherein a difference entry of the difference entries represents a difference of a value of a corresponding entry of a halftone table and a value of a corresponding entry of a reference table;
- and
- healing parameter values specifying a healing process to apply to a reconstructed halftone table produced using the coefficients,
- wherein the coefficients and the healing parameter values are accessible by the printing device to reconstruct a halftone table used in halftone printing by the printing device.
The printing device component of any preceding claim, wherein the healing process specified by the healing parameter values enforces monotonicity in an increase in PWM values for controlling a pixel.
The printing device of any preceding claim, wherein the memory device further comprises geometry information defining a halftone cell.
The printing device component of any preceding claim, wherein the memory device further comprises a scalar to scale the compressed coefficients to produce scaled compressed coefficients.
A printing device component comprising:
- a memory device comprising:
- compressed coefficients that, when decompressed by a printing device, form difference entries, wherein a difference entry of the difference entries represents a difference of a value of a corresponding entry of a halftone table and a value of a corresponding entry of a reference table;
- a minimum pulse width modulation (PWM) value for a pixel, and a maximum PWM value for a pixel;
- a healing parameter specifying a healing process to apply to a reconstructed halftone table produced using the coefficients, and the healing parameter to specify use of one or both of the minimum PWM value and the maximum PWM value by the healing process,
- wherein the coefficients, the healing parameter, and one or both of the minimum PWM value and the maximum PWM value are accessible by a printing device to reconstruct a halftone table used in halftone printing by the printing device using a print material.
A print cartridge comprising:
- a print material reservoir storing a print material;
- and
- a memory device comprising:
- compressed coefficients that, when decompressed by a printing device, form difference entries, wherein a difference entry of the difference entries represents a difference of a value of a corresponding entry of a halftone table and a value of a corresponding entry of a reference table;
- and
- healing parameter values specifying a healing process to apply to a reconstructed halftone table produced using the coefficients,
- wherein the coefficients and the healing parameter values are accessible by the printing device to reconstruct a halftone table used in halftone printing by the printing device using the print material.
Dependencies are inferred from the claim text.