# US 11,305,550 B2 · Ink deposition uniformity compensation mechanism

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- Number: US 11,305,550 B2
- Document ID: US11305550B2
- Status: Granted
- Kind: B2
- Application number: 16/286,883
- Filed: 2019-02-27
- Published: 2020-08-27
- Granted: 2022-04-19
- Earliest claimed: 2019-02-27
- Assignees: Ricoh Company, Ltd.
- Applicants: Mikel Stanich; Nikita Gurudath; Walter F. Kailey; Larry M. Ernst
- Inventors: Mikel Stanich; Nikita Gurudath; Walter F. Kailey; Larry M. Ernst
- Web page: https://patentgrep.com/patent/US11305550B2

## CPC

- B41J 2/2054: {by the variation of dot disposition or characteristics, e.g. dot number density, dot shape}
- H04N 1/603: {controlled by characteristics of the picture signal generator or the picture reproducer}
- B41J 2/2052: {by dot superpositioning, e.g. multipass doubling}
- B41J 2/2132: {Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding (methods for local corrections by dot omission, image edge enhancement, or multi-pass mask selection G06K15/102; colour conversion H04N1/40)}
- B41J 29/393: Devices for controlling or analysing the entire machine {; Controlling or analysing mechanical parameters involving printing of test patterns}
- H04N 1/405: Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N 1/4055: {producing a clustered dots or a size modulated halftone pattern}
- H04N 1/52: Circuits or arrangements for halftone screening
- H04N 1/6038: {for controlling interaction among colorants}
- B41J 2029/3935: {by means of printed test patterns}
- G06K 15/105: {Multipass or interlaced printing}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS

## Abstract

A printing system is disclosed. The printing system includes at least one physical memory device to store halftone calibration logic and one or more processors coupled with the at least one physical memory device to execute the halftone calibration logic determine an uncalibrated deposition distribution for each of a plurality of pel forming elements, determine a calibrated deposition distribution for each of the plurality of pel forming elements and determine calibration values for each of the plurality of pel forming elements.

## Claims

### Claim 1

A system comprising:
at least one physical memory device to store halftone calibration logic; and
one or more processors coupled with the at least one physical memory device to execute the halftone calibration logic to determine an uncalibrated ink deposition distribution for each of a plurality of pel forming elements based on measured data, determine a calibrated ink deposition distribution for each of the plurality of pel forming elements based on a target response including generating a total ink deposition based on an ink sum contributed by each of the plurality of pel forming elements and determining calibrated average peak values for each of the plurality of pel forming elements to achieve the target ink deposition, and determine calibration values for each of the plurality of pel forming elements, wherein the target response comprises a target ink deposition.

### Claim 2 (depends on 1)

The system of claim 1, wherein the calibration values for each of the plurality of pel forming elements are included in a calibrated halftone design.

### Claim 3 (depends on 2)

The system of claim 2, wherein the calibrated halftone design comprises a calibrated threshold array.

### Claim 4 (depends on 3)

The system of claim 3, wherein the calibrated threshold array is generated from an uncalibrated threshold array and an inverse transform function associated with each of the plurality of pel forming elements.

### Claim 5 (depends on 4)

The system of claim 4, wherein the inverse transform functions are generated using the uncalibrated ink deposition distribution for each of a plurality of pel forming elements and the calibrated ink_deposition distribution for each of the plurality of pel forming elements.

### Claim 6 (depends on 1)

The system of claim 1, wherein the at least one physical memory device to further store interpreter logic, wherein the processor executes the interpreter logic to process print job data and determine print image data using the calibration values for the pel forming elements.

### Claim 7 (depends on 6)

The system of claim 6, wherein the at least one physical memory device to store halftone calibration logic, wherein the processor executes the halftoning logic to generate a print image using the calibration values for the pel forming elements.

### Claim 8 (depends on 7)

The system of claim 7, further comprising a printer to apply colorant to a medium via the pel forming elements based on the print image.

### Claim 9

A non-transitory computer-readable medium having stored thereon instructions that, when executed by one or more processors, cause the one or more processors to:
determine an uncalibrated ink deposition distribution for each of a plurality of pel forming elements based on measured data;
determine a calibrated ink deposition distribution for each of the plurality of pel forming elements based on a target response, including:
generating a total ink deposition based on an ink sum contributed by each of the plurality of pel forming elements; and
determining calibrated average peak values for each of the plurality of pel forming elements to achieve the target ink response, wherein the target response comprises a target ink deposition; and
determine calibration values for each of the plurality of pel forming elements.

### Claim 10 (depends on 9)

The machine-readable medium of claim 9, wherein the calibration values for each of the plurality of pel forming elements are included in a calibrated halftone design.

### Claim 11 (depends on 10)

The machine-readable medium of claim 10, wherein the calibrated halftone design comprises a calibrated threshold array.

### Claim 12 (depends on 11)

The machine-readable medium of claim 11, wherein the calibrated threshold array is generated from an uncalibrated threshold array and an inverse transform function associated with each of the plurality of pel forming elements.

### Claim 13 (depends on 12)

The machine-readable medium of claim 12, wherein the inverse transform functions are generated using the uncalibrated ink deposition distribution for each of a plurality of pel forming elements and the calibrated ink_deposition distribution for each of the plurality of pel forming elements.

### Claim 14 (depends on 9)

The machine-readable medium of claim 9, comprising a machine-readable medium including data that, when accessed by a machine, further cause the machine to:
process print job data; and
determine print image data using the calibration values for the pel forming elements; and
generate a print image using the calibration values for the pel forming elements.

### Claim 15

A method comprising:
determining an uncalibrated ink deposition distribution for each of a plurality of pel forming elements based on measured data;
determining a calibrated ink deposition distribution for each of the plurality of pel forming elements based on a target response including:
generating a total ink deposition based on an ink sum contributed by each of the plurality of pel forming elements; and
determining calibrated average peak values for each of the plurality of pel forming elements to achieve a target ink deposition, wherein the target response comprises a target ink deposition; and
determining calibration values for each of the plurality of pel forming elements.

### Claim 16 (depends on 15)

The method of claim 15, wherein the calibration values for each of the plurality of pel forming elements are included in a calibrated halftone design.

### Claim 17 (depends on 16)

The method of claim 16, wherein the calibrated halftone design comprises a calibrated threshold array.

### Claim 18 (depends on 17)

The method of claim 17, wherein the calibrated threshold array is generated from an uncalibrated threshold array and an inverse transform function associated with each of the plurality of pel forming elements.

### Claim 19 (depends on 18)

The method of claim 18, wherein the inverse transform functions are generated using the uncalibrated ink deposition distribution for each of a plurality of pel forming elements and the calibrated ink deposition distribution for each of the plurality of pel forming elements.

### Claim 20 (depends on 15)

The method of claim 15, further comprising:
processing print job data; and
determining print image data using the calibration values for the pel forming elements; and
generating a print image using the calibration values for the pel forming elements.