CORRECTING ARTIFACTS ON A DISPLAY

• US 20160335744A1
• Filed: 05/15/2015
• Published: 11/17/2016
• Est. Priority Date: 05/15/2015
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Nelson, Marvin D., Bohan, David G., Kothari, Rakshit Sunil, Saber, Eli, Stauffer, Michael A.
• Granted Patent: US 9,620,082 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06T 2207/10024 Color image
• CPC Class Codes: G06T 5/77 Retouching; Inpainting; Scratch removal
• CPC Class Codes: G06T 7/0004 Industrial image inspection
• CPC Class Codes: G09G 2330/10 Dealing with defective pixels
• CPC Class Codes: G09G 2340/0457 Improvement of perceived resolution by subpixel rendering
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

An example involves identifying a first artifact in an image on a display, the first artifact caused by a first subpixel of a first pixel, determining a type of the first artifact based on a location of the first artifact relative to content of the image, and correcting the first artifact to remove the appearance of the first artifact from the display based on the type of the first artifact.

Claims

1. A method comprising:

identifying a first artifact in an image on a display, the first artifact caused by a first subpixel of a first pixel;

determining a type of the first artifact based on a location of the first artifact relative to content of the image, wherein determining the type of the first artifact comprises determining the type of the first artifact is a single artifact when the location of the first artifact is greater than a threshold distance from a second artifact, the second artifact caused by a first subpixel of a second pixel; and

correcting the first artifact to remove the appearance of the first artifact from the display based on the type of the first artifact, wherein correcting the first artifact to remove the appearance of the first artifact comprises correcting, when the type of the first artifact is a singlet artifact the first artifact using a singlet correction that adjusts an intensity of a neighboring subpixel adjacent the first subpixel of the first pixel proportional to an intensity of a second subpixel of the first pixel when the first.

3. The method as defined in claim 1, wherein determining the type of the first artifact comprises determining the type of the first artifact is a doublet artifact when the location of the first artifact is less than a threshold distance from a second artifact, the second artifact caused by a first subpixel of a second pixel;

and

wherein correcting the first artifact to remove the appearance of the first artifact comprises correcting, when the type of the first artifact is a doublet artifact, the first artifact and the second artifact using a double correction that adjusts an intensity of a first subpixel of a first neighboring pixel and an intensity of a first subpixel of a second neighboring pixel, the first subpixel of the first neighboring pixel being adjacent to the first subpixel of the first pixel and the first subpixel of the second neighboring pixel being adjacent to the first subpixel of the second pixel.

4. The method as defined in claim 1, wherein determining the type of the first artifact comprises determining the type of the first artifact is a triplet artifact when:

the location of the first artifact is less than a threshold distance from a second artifact cause by a first subpixel of a second pixel, and

the location of the first artifact is less than a threshold distance from a third artifact caused by a first subpixel of a third pixel; and

wherein correcting the first artifact to remove the appearance of the first artifact comprises correcting, when the type of the first artifact is a triplet artifact, the first artifact the second artifact, and the third artifact using a triplet correction that adjusts an intensity of neighboring subpixels respectively adjacent to the first subpixel of the first pixel, the first subpixel of the second pixel, and the first subpixel of the third pixel.

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

identifying the first artifact in the image based on an intensity of the subpixel component satisfying a threshold.

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

identifying the first artifact based on a second derivative gradient of a vector of the image, the vector comprising a mapping of spatial dimensions of the image to color dimensions of the image.

7. The method as defined in claim 1, wherein the first pixel comprises a red subpixel, a green subpixel, and a blue subpixel, the first subpixel of the first pixel comprising the red subpixel.

8. The method as defined in claim 1, wherein the first artifact is a fringe artifact caused by the first subpixel of the first pixel being located on an edge of the content.

2. (canceled)

9. An apparatus comprising:

an artifact identifier to identify artifacts in an image presented on the display, the artifacts caused by artifact pixels, wherein the artifact identifier to identify the artifacts in the image comprises the artifact classifier to;

identify potential artifact pixels corresponding to the artifacts;

determine that intensities of the potential artifact pixels satisfies a threshold; and

identify the artifact pixels as artifacts when the potential artifact pixels are in a dark neighborhood of the image;

an artifact classifier to classify the artifacts in the image as singlet artifacts, doublet artifacts, or triplet artifacts based on locations of the artifact pixels; and

an artifact corrector to correct the artifacts to remove the artifacts from the display based on whether the artifacts are singlet artifacts, doublet artifacts, or triplet artifacts.

11. The apparatus of claim 9, wherein the artifact classifier classifies the artifacts as singlet artifacts when the artifacts are not diagonally adjacent other artifacts.

12. The apparatus of claim 9, wherein the artifact classifier classifies the artifacts as double artifacts when the artifacts are diagonally adjacent to one other artifact.

13. The apparatus of claim 9, wherein the artifact classifier classifies the artifacts as triplet artifacts when the artifacts are diagonally adjacent to two other artifacts.

10. (canceled)

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

identify a subpixel of as pixel causing an artifact in a display;

determine the type of artifact caused by the subpixel based at least in part on whether the artifact is diagonally adjacent other artifacts; and

correct the artifact to remove the appearance of the artifact based on the type of the artifact by adjusting an intensity of a subpixel of a neighboring pixel adjacent the subpixel.

15. The non-transitory machine readable storage medium of claim 14, wherein the instructions cause the machine to:

determine whether the type of artifact caused by the subpixel is a singlet artifact, a doublet artifact, or a triplet artifact.

16. The non-transitory machine-readable storage medium of claim 14, wherein the instructions to determine the type of artifact caused by the subpixel comprise instructions to determine that the artifact is a singlet artifact when the artifact is not diagonally adjacent at least one other artifact.

17. The non-transitory machine-readable storage medium of claim 14, wherein the instructions to determine the type of artifact caused by the subpixel comprise instructions to determine that the artifact is a doublet artifact when the artifact is diagonally adjacent to one other artifact.

18. The non-transitory machine-readable storage medium of claim 14, wherein the instructions to determine the type of artifact caused by the subpixel comprise instructions to determine that the artifact is a triplet artifact when the artifact is diagonally adjacent to two other artifacts.