Automated icon accessibility assessment algorithm and tool

Patent metadata

Field	Value
Publication number	US-10565739-B2
Application number	US-201715858133-A
Country	US
Kind code	B2
Filing date	Dec 29, 2017
Priority date	Dec 29, 2017
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

Systems, methods, and computer-readable media for providing tools to validate color contrast are provided. To do so, three discrete color check processes are performed to ensure a user is able to identify when an icon is at risk of being inaccessible by some users. A border score considers each pixel at the edge of an icon compared to the background in which it is placed. An area score considers each discrete pixel of an icon compared to the background in which it is placed. A grid score considers a subdivision of an icon compared to the background in which it is placed. Using each of these three independent process, a summative score is provided. The summative score categories the icon into a risk level. Depending on the risk level, the icon may need to be refined to ensure it becomes more accessible.

First claim

The invention claimed is:

1. A system for providing an icon accessibility tool, the system comprising:
a processor; and
a computer storage medium storing computer-usable instructions that, when used by the processor, cause the processor to:
convert an image containing an icon into arrays of red green blue alpha (RGBA) values;
determine an area score the icon for each background color;
determine a border score for the icon;
divide the image into arrays of RBGA values corresponding to grid squares; and
determine a grid score for each grid square of the image.

2. The system of claim 1 , further comprising determining an array of coordinates for opaque pixels of the icon.

3. The system of claim 2 , further comprising excluding all pixels below an opaque alpha threshold.

4. The system of claim 3 , further comprising identifying a relative luminance between opaque pixels and a background color.

5. The system of claim 4 , wherein the area score is a percentage of identified opaque pixels with the relative luminance above a minimum contrast ratio.

6. The system of claim 5 , further comprising determining an array of coordinates of border pixels by finding pixels that are not transparent and an outer pixel or have a transparent neighboring pixel.

7. The system of claim 6 , further comprising identifying a relative luminance between opaque border pixels and a background color.

8. The system of claim 7 , further comprising providing a border score, the border score being the percentage of identified opaque border pixels with the relative luminance above a minimum contrast ratio.

9. The system of claim 6 , wherein pixels that are not transparent are pixels that have an alpha value that is above a transparent alpha threshold.

10. The system of claim 9 , further comprising filtering out grid squares that are entirely composed of transparent pixels.

11. The system of claim 10 , further comprising, for any remaining grid squares, identifying a percentage of opaque pixels greater than an area threshold.

12. The system of claim 11 , further comprising providing a grid score, the grid score being the percentage of grid squares that have the percentage of opaque pixels greater than the area threshold.

13. The system of claim 12 , wherein the border threshold, the area threshold, the minimum contrast ratio, the opaque alpha threshold, and the transparent alpha threshold are defined by a user.

14. The system of claim 13 , further comprising providing a weight score that provides weights to the number of border pixels compared to area pixels.

15. The system of claim 13 , further comprising providing a composite score to a user, the composite score considering the area score, the border score, and the grid score for the icon to evaluate a risk of the icon not being accessible when placed upon the corresponding background color round.

16. A computerized method for providing an icon accessibility tool, the method comprising:
converting an image containing an icon into arrays of red blue green alpha (RGBA) values;
determining an area score for the icon for each background color;
determining a border score for the icon;
dividing the image into arrays of RBGA values corresponding to grid squares;
determining a grid score for each grid square of the image; and
providing a composite score to a user, the composite score considering the area score, the border score, and the grid score for the icon to evaluate a risk of the icon not being accessible when placed upon the corresponding background color.

17. The method of claim 16 , further comprising:
determining an array of coordinates for opaque pixels of an icon;
excluding all pixels below an opaque alpha threshold;
identifying a relative luminance between opaque pixels and a background color; and
providing an area score, the area score being a percentage of identified opaque pixels with the relative luminance above a minimum contrast ratio.

18. The method of claim 17 , further comprising:
determining an array of coordinates of border pixels by finding pixels that are not transparent and an outer pixel or have a transparent neighboring pixel;
identifying a relative luminance between opaque border pixels and a background color; and
providing a border score, the border score being the percentage of identified opaque border pixels with the relative luminance above a minimum contrast ratio, wherein pixels that are not transparent are pixels that have an alpha value that is above an transparent alpha threshold.

19. The method of claim 18 , further comprising:
filtering out grid squares that are entirely composed of transparent pixels;
for any remaining grid squares, identifying a percentage of opaque pixels greater than an area threshold; and
providing a grid score, the grid score being the percentage of grid squares that have the percentage of opaque pixels greater than the area threshold.

20. One or more computer storage media having computer-executable instructions embodied thereon that, when executed by a computer, causes the computer to perform operations to provide an icon accessibility tool, the operations comprising:
converting an image containing an icon into arrays of red green blue alpha (RGBA) values;
dividing the image into arrays of RBGA values corresponding to grid squares;
determining an array of coordinates for opaque pixels of an icon;
excluding all pixels below an opaque alpha threshold;
identifying a relative luminance between opaque pixels and a background color;
providing an area score, the area score being a percentage of identified opaque pixels with the relative luminance above a minimum contrast ratio;
determining an array of coordinates of border pixels by finding pixels that are not transparent and an outer pixel or have a transparent neighboring pixel;
identifying a relative luminance between opaque border pixels and a background color;
providing a border score, the border score being the percentage of identified opaque border pixels with the relative luminance above a minimum contrast ratio, wherein pixels that are not transparent are pixels that have an alpha value that is above an transparent alpha threshold;
filtering out grid squares that are entirely composed of transparent pixels;
for any remaining grid squares, identifying a percentage of opaque pixels greater than an area threshold;
providing a grid score, the grid score being the percentage of grid squares that have the percentage of opaque pixels greater than the area threshold; and
providing a composite score to a user, the composite score considering the area score, the border score, and the grid score for the icon to evaluate a risk of the icon not being accessible when placed upon the corresponding background color.

Assignees

• Cerner Innovation Inc

Inventors

• Noll Aaron
• Wilson Eric
• Rajendran Mayur
• Lende Alex
• Fowler Anna-Therese
• Vaglio Jay

Classifications

• G06V10/56

  relating to colour · CPC title

• G06V10/25

  Determination of region of interest [ROI] or a volume of interest [VOI] · CPC title

• G06T7/90 Primary

  Determination of colour characteristics · CPC title

• G06F3/048

  Interaction techniques based on graphical user interfaces [GUI] · CPC title

• G06T2200/24

  involving graphical user interfaces [GUIs] · CPC title