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Method of background colour removal for porter and duff compositing

A technology of image synthesis and component synthesis, which is applied in 3D image processing, editing/combining graphics or text, image analysis, etc., and can solve the problem that the color of the background image cannot be removed

Inactive Publication Date: 2010-05-05
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when an object in such a group removes color or opacity data from the background image, conventional rendering systems cannot satisfactorily remove the background image color from the representation of the group being composited onto the background.
Thus, a group of objects cannot be composited onto the background image as a whole for all compositing operations to produce an aesthetically pleasing result

Method used

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  • Method of background colour removal for porter and duff compositing
  • Method of background colour removal for porter and duff compositing
  • Method of background colour removal for porter and duff compositing

Examples

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Embodiment Construction

[0122] It should be noted that the description contained in the Background section and the above descriptions of prior art solutions refer to the discussion of documents or devices which by virtue of their disclosure and / or use constitute disclosure. Such discussion should not be construed as a representation by the inventors of the present application that such documents or devices in any way form part of the common general knowledge in the prior art.

[0123] Combine below Figures 7 to 18 A method 700 for compositing a group of graphic objects onto a background image according to an embodiment of the present invention is described (see Figure 7 ). The method 700 allows compositing multiple objects combined onto a background image to produce a result as if each image was individually rendered onto the background image. In particular, the method 700 allows such compositing to be performed when operations are to be performed on multiple objects combined as a whole.

[0124...

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PUM

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Abstract

A method ( 700 ) of compositing a group of graphical objects onto a background image, in accordance with an embodiment of the present invention, is disclosed. The method ( 700 ) allows a grouped plurality of objects to be composited onto a background image to produce the same result as if each of the objects had been rendered separately onto the background image. In particular, the method ( 700 )allows such a composition to be performed when an operation is to be applied to a grouped plurality of objects as a whole. The principles of the method ( 700 ) have general applicability to any rendering system that accepts input graphical objects and generates a final image.

Description

technical field [0001] The present invention relates generally to rendering of graphical objects, and more particularly to a method and apparatus for compositing a set of graphical objects using background color removal, and a computer program product comprising a A computer program for compositing a set of graphical objects. Background technique [0002] A number of computer-implemented graphics rendering systems have been developed to enable creation of graphical images comprising combinations of graphical objects. A typical graphics rendering system accepts many input graphics objects, which are combined to produce a composite image. Such systems typically use a Page Description Language ("Page Description Language (PDL)") to store software-encoded descriptions of graphical objects displayed on a page. A PDL describes each such graphics object, including the attributes of each object. Such properties include the size, properties and color of each object. A PDL also de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/00G06T11/60G09G5/02G06T15/50
CPCG06T11/60G06T15/503G06T7/40G06T3/00
Inventor 克雷格·M.·布朗
Owner CANON KK