Compensating for defects in human vision while displaying text and computer graphics objects on a computer output device

• US 7,517,086 B1
• Filed: 03/16/2006
• Issued: 04/14/2009
• Est. Priority Date: 03/16/2006
• Status: Active Grant

• Current Assignee: Adobe Inc.
• Original Assignee: Adobe Systems Incorporated (Adobe Inc.)
• Inventors: Kurkure, Uday
• Primary Examiner(s): Harrington; Alicia M
• Application Number:
  US11/377,717
• Time in Patent Office: 1,125 Days
• Field of Search: 351/246, 351/223, 351/239, 351/241
• US Class Current: 351/246
• CPC Class Codes: A61B 3/032 Devices for presenting test symbols or characters, e.g. test chart projectors A61B3/036 takes precedence
• CPC Class Codes: G09B 21/008 using visual presentation of the information for the partially sighted
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/045 Zooming at least part of an image, i.e. enlarging it or shrinking it
• CPC Class Codes: G09G 5/227 Resolution modifying circuits, e.g. variable screen formats, resolution change between memory contents and display screen
• CPC Class Codes: G09G 5/26 for modifying the character dimensions, e.g. double width, double height

Abstract

One embodiment of the present invention provides a system that facilitates selecting a magnification scale factor based on an optometric prescription. The system operates by receiving an optometric prescription from a user. Next, the system selects the magnification scale factor for an output based on the user'"'"'s optometric prescription, and renders the text and other graphics objects with the selected magnification so that the document becomes legible to the user with or without corrective lenses. Finally, the system displays the scaled output.

Claims

1. A computer-implemented method, comprising:

receiving predetermined optometric correction information for a user;

subsequent to said receiving, adjusting a magnification scale factor for an output based on the predetermined optometric correction information and based on at least one font characteristic of the output, wherein the font characteristic includes one or more of;

smallest font size in the output, average font size in the output, most frequently used font size in the document, and font type in the output, wherein the output includes textual content and graphical content, and wherein the magnification scale factor is configured to enlarge the output;

generating a transformation matrix for the output according to the magnification scale factor;

rendering the output with the transformation matrix to create an enlarged output, wherein the enlarged output includes enlarged textual content and enlarged graphical content; and

displaying the enlarged output, wherein the displayed enlarged output is not used to determine the optometric correction information.

2. The method of claim 1, further comprising determining, prior to said receiving, the optometric correction information, wherein said determining the optometric correction information comprises:

presenting an eye chart to the user;

receiving a selection of a smallest legible line on the eye chart from the user; and

determining the optometric correction information from the selected legible line.

3. The method of claim 1, wherein displaying the enlarged output includes:

displaying the enlarged output on a CRT or LCD display;

or

printing the enlarged output on paper.

4. The method of claim 1, wherein the optometric correction information is specified as diopters.

5. The method of claim 1, wherein the optometric correction information is specified as a distance correlation.

6. The method of claim 1, wherein the optometric correction information is specified as a Jaeger Number.

7. The method of claim 1, wherein the optometric correction information is specified as a font point size.

8. The method of claim 1, wherein the optometric correction information is specified as a visual efficiency percentage.

9. A computer-readable storage medium storing instructions that when executed by a computer cause the computer to perform a method comprising:

receiving predetermined optometric correction information for a user;

subsequent to said receiving, adjusting a magnification scale factor for an output based on the predetermined optometric correction information and based on at least one font characteristic of the output, wherein the font characteristic includes one or more of;

smallest font size in the output, average font size in the output, most frequently used font size in the document, and font type in the output, wherein the output includes textual content and graphical content, and wherein the magnification scale factor is configured to enlarge the output;

generating a transformation matrix for the output according to the magnification scale factor;

rendering the output with the transformation matrix to create an enlarged output, wherein the enlarged output includes enlarged textual content and enlarged graphical content; and

displaying the enlarged output, wherein the displayed enlarged output is not used to determine the optometric correction information.

10. The computer-readable storage medium of claim 9, wherein the method further comprises determining, prior to said receiving, the optometric correction information, wherein said determining the optometric correction information comprises:

presenting an eye chart to the user;

receiving a selection of a smallest legible line on the eye chart from the user; and

determining the optometric correction information from the selected legible line.

11. The computer-readable storage medium of claim 9, wherein displaying the enlarged output includes:

displaying the enlarged output on a CRT or LCD display;

or

printing the enlarged output on paper.

12. The computer-readable storage medium of claim 9, wherein the optometric correction information is specified as diopters.

13. The computer-readable storage medium of claim 9, wherein the optometric correction information is specified as a distance correlation.

14. The computer-readable storage medium of claim 9, wherein the optometric correction information is specified as a Jaeger Number.

15. The computer-readable storage medium of claim 9, wherein the optometric correction information is specified as a font point size.

16. The computer-readable storage medium of claim 9, wherein the optometric correction information is specified as a visual efficiency percentage.

17. An apparatus, comprising:

a receiving mechanism configured to receive predetermined optometric correction information for a user;

a magnification mechanism configured to;

adjust a magnification scale factor for an output based on the predetermined optometric correction information and based on at least one font characteristic of the output, wherein the font characteristic includes one or more of;

smallest font size in the output, average font size in the output, most frequently used font size in the document, and font type in the output, wherein the output includes textual content and graphical content, and wherein the magnification scale factor is configured to enlarge the output; and

generate a transformation matrix for the output according to the magnification scale factor;

a rendering mechanism configured to render the output with the transformation matrix to create an enlarged output, wherein the enlarged output includes enlarged textual content and enlarged graphical content; and

a display mechanism configured to display the enlarged output, wherein the displayed enlarged output is not used to determine the optometric correction information.

18. The apparatus of claim 17, further comprising:

a presentation mechanism configured to present an eye chart to the user;

wherein the apparatus is further configured to receive a selection of a smallest legible line on the eye chart from the user, to determine the optometric correction information from the selected legible line, and to provide the optometric correction information to the receiving mechanism as the predetermined optometric correction information.

19. The apparatus of claim 17, wherein the display mechanism is configured to:

display the enlarged output on a CRT or LCD display;

or

print the enlarged output on paper.

20. The apparatus of claim 17, wherein the optometric correction information is specified as diopters.