AUTOMATIC COLOR CONTRAST ANALYZER

• US 20090263016A1
• Filed: 04/18/2008
• Published: 10/22/2009
• Est. Priority Date: 04/18/2008
• Status: Active Grant

• Current Assignee: Sap France (SAP SE)
• Original Assignee: Sap France (SAP SE)
• Inventors: Kuo, Heng-Chun Scott
• Granted Patent: US 8,144,979 B2
• Time in Patent Office: Days
• US Class Current: 382/167
• CPC Class Codes: G06T 2207/30168 Image quality inspection
• CPC Class Codes: G06T 7/0002 Inspection of images, e.g. flaw detection
• CPC Class Codes: G09B 21/008 using visual presentation of the information for the partially sighted
• CPC Class Codes: H04N 1/6027 Correction or control of colour gradation or colour contrast H04N1/6058 takes precedence

Abstract

A computerized method and apparatus to analyze color contrast are provided. In an example embodiment, a computer readable storage medium is provided that comprises executable instructions. When executed, the instructions access data associated with a visual representation including text and perform optical character recognition on the visual representation to identify at least one character of the text. Further color data is extracted from a first area and a second area, the first area forming part of the at least one character and the second area external to the at least one character; and calculate a color contrast value based on the first and second areas. The instructions to access the data, perform the optical character recognition, extract the color data and calculate the color contrast are performed sequentially and automatically by a processor without human intervention.

Claims

1. A computer-readable storage medium, comprising executable instructions to:

access data associated with a visual representation including text;

perform optical character recognition on the visual representation to identify at least one character of the text;

extract color data from a first area and a second area, the first area forming part of the at least one character and the second area external to the at least one character; and

calculate a color contrast value based on the first and second areas.

2. The computer-readable storage medium of claim 1, wherein the instructions to access the data, perform the optical character recognition, extract the color data and calculate the color contrast are performed sequentially and automatically by a processor without human intervention.

3. The computer-readable storage medium of claim 1, further comprising executable instructions to return the color contrast value.

4. The computer-readable storage medium of claim 1, wherein the instructions to access data comprise obtaining a screenshot of the visual representation rendered on a display screen.

5. The computer-readable storage medium of claim 1, wherein the instructions to extract the color data comprise executable instructions to:

identify a plurality of intersection points between the first area and the second area, the plurality of intersection points including at least a first intersection point, a second intersection point and a third intersection point;

extract character color data at a first color data point between the first intersection point and the second intersection point;

extract external color data at a second color data point between the second intersection point and the third intersection point; and

calculate the color contrast value based on the character color data and the external color data.

6. The computer-readable storage medium of claim 5, wherein the plurality of intersection points are along a straight line intersecting a plurality of characters of the text.

7. The computer-readable storage medium of claim 6, further comprising executable instructions to:

calculate a plurality of color contrast values from the plurality of intersections points;

compare each color contrast value of the plurality of color contrast values to a reference color contrast value; and

selectively return a notification based on the comparison.

8. The computer-readable storage medium of claim 6, further comprising executable instructions to:

calculate a plurality of color contrast values along at least two spaced apart lines extending through characters in the text;

compare each color contrast value of the plurality of color contrast values to a reference color contrast value; and

selectively return a notification based on the comparison.

9. The computer-readable storage medium of claim 1, further comprising executable instructions to:

compare the color contrast value with a reference contrast value; and

provide a notification based on the comparison.

10. The computer-readable storage medium of claim 9, further comprising executable instructions to:

calculate a plurality of contrast values using one or more characters in the text; and

provide a display notification when a result of the comparison is less than a reference contrast value.

11. The computer-readable storage medium of claim 1, wherein the instructions to extract the color data comprise executable instructions to:

extract a first set of color data from the first area, and a second set of color data from the second area;

identify a first luminosity value of the first set of color data, and a second luminosity of the second set of color data;

adjust the luminosity of at least one of the first set of color data and the second set of color data so that the color contrast value for an adjusted set meets a reference color contrast value; and

return suggested color data on, wherein the suggested color data is based on the adjusted set.

12. The computer-readable storage medium of claim 11, further comprising executable instructions to automatically modify the visual representation based on the adjusted set.

13. The computer-readable storage medium of claim 1, further comprising executable instructions to generate a graphical user interface component that displays the color contrast value.

14. The computer-readable storage medium of claim 1, wherein the instructions are integrated within an application program for creating graphic representations.

15. An apparatus comprising:

memory to store executable instructions; and

a processor to execute the instructions, the instructions to;

access data associated with a visual representation including text;

perform optical character recognition on the visual representation to identify at least one character of the text;

extract color data from a first area and a second area, the first area forming part of the at least one character and the second area external to the at least one character; and

calculate a color contrast value based on the first and second areas.

16. The apparatus of claim 15, wherein the instructions to access the data, perform the optical character recognition, extract the color data and calculate the color contrast are performed sequentially and automatically by a processor without human intervention.

17. The apparatus of claim 15, wherein the instructions display the color contrast value on a display screen.

18. The apparatus of claim 15, wherein the instructions to access data comprise obtaining a screenshot of the visual representation rendered on a display screen.

19. The apparatus of claim 15, wherein the instructions to extract the color data comprise instructions to:

identify a plurality of intersection points between the first area and the second area, the plurality of intersection points including at least a first intersection point, a second intersection point and a third intersection point;

extract character color data at a first color data point between the first intersection point and the second intersection point;

extract external color data at a second color data point between the second intersection point and the third intersection point; and

calculate the color contrast value based on the character color data and the external color data.

20. The apparatus of claim 15, wherein the plurality of intersection points are selected to be along a straight line intersecting a plurality of characters of the text.