Method of rendering an overlapping region

• US 9,514,555 B2
• Filed: 09/26/2013
• Issued: 12/06/2016
• Est. Priority Date: 09/28/2012
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Fraser, Thomas Grant, Belbin, Joseph Leigh
• Primary Examiner(s): Richer, Joni
• Application Number:
  US14/037,762
• Publication Number:
  US 20140118368A1
• Time in Patent Office: 1,167 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06T 11/60 Editing figures and text; Combining figures or text
• CPC Class Codes: G06T 15/503 Blending, e.g. for anti-aliasing
• CPC Class Codes: G06T 2210/62 Semi-transparency
• CPC Class Codes: G09G 2340/10 Mixing of images, i.e. displayed pixel being the result of an operation, e.g. adding, on the corresponding input pixels
• CPC Class Codes: G09G 5/026 Control of mixing and/or overlay of colours in general G09G5/022 and G09G5/024 take precedence
• CPC Class Codes: G09G 5/377 for mixing or overlaying two or more graphic patterns G09G5/02, G09G5/397 take precedence

Abstract

Disclosed is a method of modifying a graphics command. The method receives a graphics command comprising a drawing operation and a pattern (ROP3) of the region and obtains spatial frequencies of the pattern. The method determines if the obtained spatial frequencies of the pattern in the graphics command define a transparency attribute of the region to be rendered and replaces at least the pattern in the graphics command with a transparency coefficient based on the obtained spatial frequencies.

Claims

1. A method of modifying a graphics command, the method comprising:

receiving from a computerized graphical interface a graphics command comprising a drawing operation in a region and a pattern of the region;

obtaining transparency characteristics from a frequency representation of the pattern;

determining if the obtained transparency characteristics satisfy a set of transparency criteria; and

replacing at least the pattern with a transparency coefficient based on the frequency representation if the obtained transparency characteristics satisfy the set of transparency criteria.

2. The method according to claim 1 further comprising rendering the region using the transparency coefficient.

3. The method according to claim 1, wherein the replacing comprises replacing the graphics command with a binary raster operation where a fill has a determined transparency value applied.

4. The method according to claim 1, where the frequency representation is calculated using a Discrete Cosine Transform.

5. The method according to claim 1, wherein the replacing comprises determining that the transparency coefficient is transparent, and then removing the graphics command.

6. The method according to claim 1, wherein the replacing comprises determining that said transparency coefficient is opaque, and then removing the pattern thus modifying the object to be an opaque shape.

7. A method of modifying a graphics command, said method comprising:

receiving from a computerized graphical interface a graphics command comprising a drawing operation in a region and a raster operation pattern of the region;

obtaining alternation characteristics from a frequency representation of the pattern;

determining if the obtained alternation characteristics satisfy a set of alternation criteria; and

replacing the pattern with a glyph if the obtained alternation characteristics satisfy the set of alternation criteria.

8. The method according to claim 7, further comprising rendering the region using the glyph.

9. The method according to claim 7, where the frequency representation is calculated using a Discrete Cosine Transform.

10. The method according to claim 7 wherein the replacing comprises determining a transparency attribute of the pattern and selecting the glyph having a corresponding transparency from a set of glyphs having a range of transparencies.

11. A method of rendering a region, the method comprising:

receiving from a computerized graphical interface a graphics command comprising a drawing operation containing raster data;

obtaining tiling characteristics from a frequency representation of the raster data;

determining if the obtained tiling characteristics satisfy a set of tiling criteria; and

replacing the raster data with smaller raster data and tiling information if the obtained tiling characteristics satisfy the set of tiling criteria.

12. The method according to claim 11, where the frequency representation is calculated using a Discrete Cosine Transform.

13. The method according to claim 11, where the smaller raster data is formed by a tile having equal height and width.

14. A method of rendering a region, the method comprising:

receiving from a computerized graphical interface a graphics command comprising a drawing operation in a region and a pattern of the region defined by a ternary raster operation;

obtaining a frequency representation of the pattern using a Discrete Cosine Transform;

determining replication characteristics from the frequency representation;

determining if the determined replication characteristics satisfy a set of replication criteria;

replacing at least the pattern with a binary raster operation based on the determined replication characteristics to form a modified graphics command; and

rendering at least the region using the modified graphics command.

15. The method according to claim 14 wherein the determined replication characteristics comprises a constant transparency attribute.

16. The method according to claim 14 wherein the determined replication characteristics comprise a tiling pattern, and the replacing comprises replacing the pattern with one of a glyph or a raster region having a size smaller than the region.