Automated icon accessibility assessment algorithm and tool

Patent metadata

Field	Value
Publication number	US-11216982-B2
Application number	US-201916705840-A
Country	US
Kind code	B2
Filing date	Dec 6, 2019
Priority date	Dec 29, 2017
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

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:
receive an image containing an icon;
determine a risk level of the icon for a background color;
determine a composite score for the icon, the composite score considering an area score, a border score, and a grid score for the icon to evaluate the risk of the icon being inaccessible when placed upon the corresponding background color round; and

upon receiving a user interaction with a threshold of the risk level, provide an indication highlighting which part of the icon is at risk of being inaccessible.

2. The system of claim 1 , further comprising converting the image containing the icon into arrays of red green blue alpha (RGBA) values.

3. The system of claim 1 , further comprising determining an area score for the icon for each background color, the area score being a percentage of identified opaque pixels with a relative luminance above a minimum contrast ratio.

4. The system of claim 1 , further comprising determining a border score for the icon, the border score being a percentage of identified opaque border pixels with a relative luminance above a minimum contrast ratio.

5. The system of claim 1 , further comprising determining a grid score for the icon, the grid score being a percentage of grid squares that have a percentage of opaque pixels greater than an area threshold.

6. The system of claim 1 , wherein a border threshold, an area threshold, a minimum contrast ratio, an opaque alpha threshold, and a transparent alpha threshold are defined by a user.

7. A computerized method for providing an icon accessibility tool, the method comprising:
receiving an image containing an icon;
determining a risk level of the icon for a background color;
determining a composite score for the icon, the composite score considering an area score, a border score, and a grid score for the icon to evaluate the risk of the icon being inaccessible when placed upon the corresponding background color round; and
upon receiving a user interaction with a threshold of the risk level, providing an indication highlighting which part of the icon is at risk of being inaccessible.

8. The method of claim 7 , further comprising converting the image containing the icon into arrays of red green blue alpha (RGBA) values.

9. The method of claim 7 , further comprising determining an area score for the icon for each background color, the area score being a percentage of identified opaque pixels with a relative luminance above a minimum contrast ratio.

10. The method of claim 7 , further comprising determining a border score for the icon, the border score being a percentage of identified opaque border pixels with a relative luminance above a minimum contrast ratio.

11. The method of claim 7 , further comprising determining a grid score for the icon, the grid score being a percentage of grid squares that have a percentage of opaque pixels greater than an area threshold.

12. The method of claim 7 , wherein a border threshold, an area threshold, a minimum contrast ratio, an opaque alpha threshold, and a transparent alpha threshold are defined by a user.

13. 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:
receiving an image containing an icon;
determining an area score for the icon, the area score being a percentage of identified opaque pixels with relative luminance above a minimum contrast ratio;
determining a border score for the icon, the border score being a percentage of identified opaque border pixels with relative luminance above the minimum contrast ratio;
determining a grid score, the grid score being a percentage of grid squares that have a percentage of opaque pixels greater than an area threshold; and
providing a composite score to a user for one or more backgrounds, the composite score enabling the user to select a most accessible icon in accordance with the background having a lowest risk composite score, wherein the composite score considers the area score, the border score, and the grid score for the icon.

14. The media of claim 13 , further comprising converting the image containing the icon into arrays of red green blue alpha (RGBA) values.

15. The media of claim 13 , further comprising dividing the image into arrays of RBGA values corresponding to grid squares.

16. The media of claim 13 , wherein determining the area score comprises:
determining an array of coordinates for opaque pixels of the icon;
excluding all pixels below an opaque alpha threshold; and
identifying a relative luminance between opaque pixels and a background color.

17. The media of claim 13 , wherein determining the border score comprises:
an array of coordinates of border pixels by finding pixels that are not transparent and an outer pixel or have a transparent neighboring pixel, wherein pixels that are not transparent are pixels that have an alpha value that is above a transparent alpha threshold; and
identifying a relative luminance between opaque border pixels and a background color.

18. The media of claim 13 , wherein determining the grid score comprises:
filtering out grid squares that are entirely composed of transparent pixels; and
for any remaining grid squares, identifying a percentage of opaque pixels greater than an area threshold.

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

• G06T11/10 Primary

  Texturing; Colouring; Generation of textures or colours (retouching, inpainting or scratch removal G06T5/77) · CPC title

• G06T2207/20021

  Dividing image into blocks, subimages or windows · CPC title