Adaptive contextual filtering

• US 7,821,524 B2
• Filed: 06/26/2007
• Issued: 10/26/2010
• Est. Priority Date: 06/26/2007
• Status: Active Grant

• Current Assignee: Zhigu Holdings Limited
• Original Assignee: Microsoft Corporation
• Inventors: Hitchcock, Gregory C., Wade, Geraldine, Matskewich, Tanya
• Primary Examiner(s): Amini; Javid A
• Application Number:
  US11/768,827
• Publication Number:
  US 20090009529A1
• Time in Patent Office: 1,218 Days
• Field of Search: 345/619, 348/448
• US Class Current: 345/619
• CPC Class Codes: G06T 2207/20012 Locally adaptive
• CPC Class Codes: G06T 5/00 Image enhancement or restoration
• CPC Class Codes: G06T 5/20 using local operators

Abstract

Selectively applying graphical filtering to a portion of an object. One method described herein includes a method including accessing an object to be rendered. At least one characteristic of a portion of the object is determined. A filter is selected that has been pre-specified for the at least one determined characteristic. The filter is applied to the portion of the object, while not applying the filter to at least one other portion of the object.

Claims

1. A method implemented by a computing system having a processor of selectively applying graphical filtering to a portion of a character, the method comprising:

a) accessing a character to be rendered;

b) identifying a limited portion of the character, the limited portion of the character consisting of less than the entire character and being defined by a particular characteristic, the particular characteristic comprising one or more of a structural, chromatic, typographical or geometrical characteristic corresponding to the limited portion of the character;

c) selecting a filter that has been pre-specified for the particular characteristic, based at least in part on a hinting language definition associated with the character;

d) applying the filter to the limited portion of the character, while refraining from applying the filter to the entire character, and

e) applying an additional filter that has been pre-specified for another characteristic of a different limited portion of the character to the different limited portion of the character and while refraining from applying the additional filter to the entire character,

wherein the filter applied to the limited portion of the character comprises a relatively wide gray-scale filter as compared to the additional filter comprising a relatively narrow gray-scale filter.

2. The method of claim 1, wherein the particular characteristic comprises a typographical characteristic.

3. The method recited in claim 2, wherein the particular characteristic is defined as either a stroke, a serif or a counter space corresponding to the character.

4. The method of claim 1, wherein the particular characteristic comprises a geometrical characteristic.

5. The method of claim 4, wherein the geometrical characteristic comprises a distance between strokes.

6. The method of claim 1, wherein the particular characteristic is defined by a user selection.

7. The method of claim 1, wherein identifying the limited portion of the character comprises identifying a zone of the object.

8. The method of claim 1, wherein the filter is pre-selected by human determination.

9. The method of claim 1, wherein the filter is pre-specified in a filter hinting language.

10. The method of claim 9, wherein the filter is specified within the filter hinting language by human interaction.

11. The method of claim 1, further comprising repeating acts b through d for other characteristics before displaying the character to a user.

12. The method of claim 1, wherein the filter includes parameters directed to models of human visual perception.

13. The method of claim 12, wherein the filter includes parameters directed to models of human visual perception that are based on a distinction between dichromatic visual perception and trichromatic visual perception.

14. The method of claim 1, wherein the filter includes parameters directed to human recognition specific to a class of objects.

15. The method recited in claim 1, wherein the limited portion of the character comprises exterior curves of the character, to which the relatively wide gray-scale filter is applied, and wherein the different limited portion of the character comprises interior counter spaces of the character, to which the relatively narrow gray-scale filter is applied.

16. The method recited in claim 1, wherein the particular characteristic is a typographical characteristic comprising one of a serif, a stroke, a stem and a diagonal and such that identifying the limited portion of the character includes distinguishing between at least said serif, stroke, stem or diagonal, and wherein the method further includes selecting the filter to be applied to the limited portion of the character based at least in part on whether the particular characteristic is distinguished to be said serif, stroke, stem or diagonal.

17. In a computing environment, a computer readable medium comprising computer executable instructions that when executed by a processor cause the following to be performed:

a) accessing a character to be rendered;

b) identifying a limited portion of the character, the limited portion of the character consisting of less than the entire character and being defined by a particular characteristic, the particular characteristic comprising one or more of a structural, chromatic, typographical or geometrical characteristic corresponding to the limited portion of the character;

c) selecting a filter that has been pre-specified for the particular characteristic, based at least in part on a hinting language definition associated with the character;

d) applying the filter to the limited portion of the character, while refraining from applying the filter to the entire character, and

e) applying an additional filter that has been pre-specified for another characteristic of a different limited portion of the character to the different limited portion of the character and while refraining from applying the additional filter to the entire character,

wherein the filter applied to the limited portion of the character comprises a relatively wide gray-scale filter as compared to the additional filter comprising a relatively narrow gray-scale filter.

18. A computing system comprising:

a processor;

a memory coupled to the processor, wherein the memory comprises computer executable instructions that when executed by the processor cause the following to be performed;

a) accessing a character to be rendered;

b) identifying a limited portion of the character, the limited portion of the character consisting of less than the entire character and being defined by a particular characteristic, the particular characteristic comprising one or more of a structural, chromatic, typographical or geometrical characteristic corresponding to the limited portion of the character;

c) selecting a filter that has been pre-specified for the particular characteristic, based at least in part on a hinting language definition associated with the character;

d) applying the filter to the limited portion of the character, while refraining from applying the filter to the entire character, and

e) applying an additional filter that has been pre-specified for another characteristic of a different limited portion of the character to the different limited portion of the character and while refraining from applying the additional filter to the entire character,

wherein the filter applied to the limited portion of the character comprises a relatively wide gray-scale filter as compared to the additional filter comprising a relatively narrow gray-scale filter.