CORRECTING COLOR DIFFERENCES BETWEEN SCANNER MODULES

• US 20170359489A1
• Filed: 03/31/2015
• Published: 12/14/2017
• Est. Priority Date: 03/31/2015
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: LOPEZ, Miguel Angel
• Granted Patent: US 10,397,446 B2
• Time in Patent Office: Days
• CPC Class Codes: H04N 1/02805 with photodetectors arranged in a two-dimensional array
• CPC Class Codes: H04N 1/401 Compensating positionally unequal response of the pick-up or reproducing head H04N1/403 takes precedence
• CPC Class Codes: H04N 1/403 Discrimination between the two tones in the picture signal of a two-tone original
• CPC Class Codes: H04N 1/46 Colour picture communication systems
• CPC Class Codes: H04N 1/6019 using look-up tables H04N1/6025 takes precedence
• CPC Class Codes: H04N 1/603 controlled by characteristics of the picture signal generator or the picture reproducer
• CPC Class Codes: H04N 1/6033 using test pattern analysis H04N1/6055 takes precedence
• CPC Class Codes: H04N 1/6055 using test pattern analysis
• CPC Class Codes: H04N 2201/0081 Image reader H04N2201/0091 - H04N2201/0094 take precedence
• CPC Class Codes: H04N 2201/0094 Multifunctional device, i.e. a device capable of all of reading, reproducing, copying, facsimile transception, file transception

Abstract

An example disclosed herein analyzes a first scan of a first target scanned with a first scanner module of a scanner, analyzes second scan of a second target scanned with a second scanner module of the scanner, identifies a color difference greater than a threshold color difference between the first scan and the second scan, and adjusts color settings for the first scanner module to correct the color difference to less than the threshold color difference.

Claims

1. A method comprising:

analyzing a first scan of a first target scanned using a first scanner module of a scanner;

analyzing second scan of a second target scanned using a second scanner module of the scanner;

identifying a color difference greater than a threshold color difference between the first scan and the second scan; and

adjusting color settings for the first scanner module to correct the color difference to less than the threshold color difference.

2. The method as defined in claim 1, further comprising:

determining the color settings of the first scanner module to correct the color difference.

3. The method as defined in claim 1, further comprising determining a transformation to correct the color difference and adjusting the color settings for the first scanner module based on the transformation, the transformation stored in a look-up-table for the scanner.

4. The method as defined in claim 3, wherein the first target and the second target are each a standard color target, the color settings are determined by:

determining a first scanner profile for the first scanner module, the first scanner profile based on a standard color target;

determining a second scanner profile for the second scanner module, the second scanner profile based on the standard color target,

wherein the color settings are based on a transformation from the first scanner profile to the second scanner profile.

5. The method as defined in claim 3, the transformation comprising a red-green-blue to red-green-blue transformation.

6. The method as defined in claim 3, wherein the first and second scanner profile comprise respective universal color coordinates of the standard color target.

7. The method as defined in claim 1, further comprising feeding target media to the scanner, the target media comprising the first target and the second target.

8. An apparatus comprising:

a module analyzer to identify a color difference between a first scanned target and a second scanned target, the first scanned target scanned by a first scanner module of a scanner and the second scanned target scanned by a second scanner module of the scanner;

a module profiler to generate a first color profile based on the first scanned target and a second color profile based on the second scanned target; and

a module color manager to adjust scan settings of the first scanner module based on a transformation determined from the first color profile and the second color profile.

9. The apparatus as defined in claim 8, wherein the first scanner module and the second scanner module are neighboring scanner modules such that they are located adjacent one another in the scanner.

10. The apparatus as defined in claim 8, wherein the module color manager is to adjust the scan settings by storing a color transformation for the first scanner profile in a look-up-table of the scanner.

11. The apparatus as defined in claim 8, wherein the module profiler is to compare the first scanned target and a standard color target to generate the first color profile and compare the second scanned target to the standard color target to generate the second color profile.

12. A non-transitory machine readable storage medium comprising instructions that, when executed, cause a machine to at least:

detect a color difference between a first scan of a first target and a second scan of a second target, the first target scanned by a first scanner module of a scanner and the second target scanned by a second scanner module of the scanner;

determine a first color profile of the first scanner module based on the first scan of the first target and a standard color target;

determine a second color profile for the second scanner module based on the second scan of the second target and the standard color target; and

calculate a transformation based on the first color profile and the second color profile, the transformation to adjust color settings of the first scanner module to correct the color difference.

13. The non-transitory machine readable storage medium of claim 12, wherein the color difference is greater than a threshold color difference and the transformation adjusts the color settings of the first scanner module to correct the color difference to less than the threshold color difference.

14. The non-transitory machine readable storage medium of claim 12, wherein the instructions, when executed, further cause the machine to store the transformation in a look-up-table of the scanner, the look-up-table to control color settings for the first scanner module and the second scanner module of the scanner.

15. The non-transitory machine readable storage medium of claim 12, wherein the second scanner module is a neighbor scanner module of the first scanner module.