Ink thickness rendering for electronic annotations
View Patent ↗A system and method for rendering ink annotations for a displayed image is disclosed. The invention adjusts the thickness of rendered lines for ink annotations when rendered. Ink annotations are created by capturing and connecting a set of data points input by a user. The invention outlines various pixels and weights saturation of anti-aliasing pixels to improve a user's viewing experience.
1. A computer-implemented method for annotating a system having a display for displaying a page, said method comprising the steps of:
receiving an annotation;
applying one of outline pixels and anti-aliased pixels to at least some pixels surrounding said annotation;
applying the other one of said outline pixels and said anti-aliased pixels; and
displaying said annotation with a first displayable thickness and said outline pixels with a second displayable thickness and said anti-aliased pixels with a third displayable thickness on said display, wherein said outline pixels extend beyond said annotation.
2. The computer-implemented method according to claim 1 , further comprising the step of:
applying an anti-aliasing filter so as to create said anti-aliased pixels for said annotation prior to said outline applying step.
3. The computer-implemented method according to claim 2 , wherein the outline applying step further comprises the step of:
adding an outline pixel juxtaposed to one of a pair of anti-aliased pixels, wherein said one of said pair is darker than the other of said pair.
4. The computer-implemented method according to claim 2 , wherein the outline applying step further comprises the step of:
adding an outline pixel to each one of a pair of anti-aliased pixels, when the color of each one of said pair of anti-aliased pixels are equal.
5. The computer-implemented method according to claim 1 , further comprising the step of:
applying an anti-aliasing filter so as to create said anti-aliased pixels for said annotation subsequent to said outline applying step.
6. The computer-implemented method according to claim 5 , wherein the outline applying step further comprises the step of:
adding an outline pixel juxtaposed to one of a pair of anti-aliased pixels, wherein said one of said pair is darker than the other of said pair.
7. The computer-implemented method according to claim 5 , wherein the outline applying step further comprises the step of:
adding an outline pixel to each one of a pair of anti-aliased pixels, when the color of each one of said pair of anti-aliased pixels are equal.
8. The computer-implemented method according to claim 1 , wherein colors resulting from the anti-alias applying step are no lighter than the outline color of said annotation.
9. The computer-implemented method according to claim 1 , wherein said outline applying step further comprises the steps of:
determining an original color of a pixel of said pixels;
determining a color of said annotation;
determining the outline color to which to set said pixel as based on a combination of said original color and said annotation color.
10. The computer-implemented method according to claim 1 , wherein the outline applying step further comprises the step of:
adding at least two outline pixels to each pixel of said annotation.
11. The computer-implemented method according to claim 1 , wherein said receiving step includes capturing an annotation from user input.
12. The computer-implemented method according to claim 1 , wherein said receiving step includes retrieving said annotation from a memory.
13. The computer-implemented method according to claim 1 , wherein at least two of said first displayable thickness, said second displayable thickness, and said third displayable thickness are the same.
14. The computer-implemented method according to claim 1 , wherein said first displayable thickness, said second displayable thickness, and said third displayable thickness are different from each other.
15. A computer-readable medium having a program stored thereon, said program used in conjunction with a system having a display for displaying a page, said program comprising the steps of:
receiving an annotation;
applying one of a group of some pixels forming outline pixels and a group of some pixels forming anti-aliased pixels to at least some pixels surrounding said annotation;
applying the other of said group of some pixels forming outline pixels and said group of some pixels forming anti-aliased pixels; and
displaying said annotation with a first displayable thickness and said outline pixels with a second displayable thickness and said anti-aliased pixels with a third displayable thickness on said display, such that said outline pixels are visible at least next to said annotation.
16. The computer-readable medium having said program according to claim 15 , further comprising the step of:
applying an anti-aliasing filter to said annotation prior to said outline pixel applying step.
17. The computer-readable medium having said program according to claim 16 , wherein the outline applying step further comprises the step of:
adding an outline pixel juxtaposed to one of a pair of anti-aliased pixels, wherein said one of said pair is darker than the other of said pair.
18. The computer-readable medium having said program according to claim 16 , wherein the outline applying step further comprises the step of:
adding an outline pixel to each one of a pair of anti-aliased pixels, when the color of each one of said pair of anti-aliased pixels are equal.
19. The computer-readable medium having said program according to claim 15 , further comprising the step of:
applying an anti-aliasing filter to said annotation subsequent to said outline pixel applying step.
20. The computer-readable medium having said program according to claim 19 , wherein the outline applying step further comprises the step of:
adding an outline pixel juxtaposed to one of a pair of anti-aliased pixels, wherein said one of said pair is darker than the other of said pair.
21. The computer-readable medium having said program according to claim 19 , wherein the outline applying step further comprises the step of:
adding an outline pixel to each one of a pair of anti-aliased pixels, when the color of each one of said pair of anti-aliased pixels are equal.
22. The computer-readable medium having said program according to claim 15 , wherein a color of the anti-aliased pixels to be applied is no lighter than the outline color of said annotation.
23. The computer-readable medium having said program according to claim 15 , wherein said outline applying step further comprises the steps of:
determining an original color of a pixel of said pixels;
determining a color of said annotation;
determining the color of anti-aliased pixels;
determining a color to which to set said anti-aliased pixels as based on a combination of outline color and said annotation color.
24. The computer-readable medium having said program according to claim 23 , wherein the outline applying step further comprises the step of:
adding at least two outline pixels to each pixel of said annotation.
25. The computer-readable medium having said program according to claim 23 , wherein said receiving step includes capturing an annotation from user input.
26. The computer-readable medium having said program according to claim 23 , wherein said receiving step includes retrieving said annotation from a memory.
27. The computer-readable medium having said program according to claim 15 , wherein at least two of said first displayable thickness, said second displayable thickness, and said third displayable thickness are the same.
28. The computer-readable medium having said program according to claim 15 , wherein said first displayable thickness, said second displayable thickness, and said third displayable thickness are different from each other.