US5379129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for compositing a source and destination image using a mask image
Assignee: Apple Inc
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Filing: 1992-05-08
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Granted: 1995-01-03
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Expires: 2012-05-08
Abstract
Abstract This invention provides a method for compositing a source image and a destination image using a mask image to produce a result image in a digital image processing system. The method is, on a pixel-by-pixel basis, using the mask image to select between the source and destination images: where a black color value for a mask pixel selects the color value of the corresponding pixel of the source image; and a white color value for a mask pixel selects the color value of the corresponding pixel of the destination image; and where an intermediate color value for a mask pixel selects a weighted average between source and destination pixel color values. The calculations of the weighted average color value are done in color space, such as on a color component by color component basis. The result image can be displayed or stored for further use. This method can be described in boolean expression according to the formula: result=((1-mask)*source)+(mask*destination).
Inventors
- 👤 Konstantin Othmer
- 👤 Bruce A. Leak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:29
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/387; H04N1/3872
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A method for compositing a source image and a destination image using a mask image to produce a result image in a digital image processing system comprising: on a pixel-by-pixel basis, using the mask image to select between the source and destination images, where a black color value for a mask pixel selects the color value of the corresponding pixel of the source image, and a white color value for a mask pixel selects the color value of the corresponding pixel of the destination image, and where an intermediate color value for a mask pixel selects a weighted average between source and destination pixel color values, and writing said selected color values to corresponding pixels of the result image.
Claim 2
Independent Claim
119 words
A method for compositing a source image and a destination image using a mask image to produce a result image in a digital image processing system comprising: on a pixel-by-pixel basis, using the mask image to select between the source and destination images, where a black color value for a mask pixel selects the color value of the corresponding pixel of the source image, and a white color value for a mask pixel selects the color value of the corresponding pixel of the destination image, and where an intermediate color value for a mask pixel selects a weighted average between source and destination pixel color values, and writing said selected color values to corresponding pixels of the result image.
Claim 3
Dependent Claim
25 words
A method as in claim 1 wherein for each pixel, the selections are done in color space on a color component by color component basis.
Claim 4
Dependent Claim
12 words
A method as in claim 1 further comprising displaying the result image.
Claim 5
Dependent Claim
29 words
A method as in claim 1 wherein said method is applied during an operation of a copy procedure for copying pixels from said source image to said destination image.
Claim 6
Dependent Claim
25 words
A method as in claim 4 wherein said copy procedure also includes changing the pixel depth, image size, and visible regions of said destination image.
Claim 7
Dependent Claim
33 words
A method as in claim 1 wherein said method produces patterned text in said destination image by performing the method with the source image being a pattern and the mask image being text.
Claim 8
Dependent Claim
34 words
A method as in claim 1 wherein said method produces anti-aliased text in said destination image by performing the method with the source image being a pattern and the mask image being anti-aliased text.
Claim 9
Independent Claim
67 words
A method for compositing a source image and a destination image using a mask image to produce a result image in a digital image processing system comprising: on a pixel-by-pixel basis, combining images using boolean expression according to the formula; result=((1-mask)*source)+(mask*destination); wherein for each said pixel, said combining is done in a color space on a color component by color component basis; and displaying the result image.
Claim 10
Independent Claim
67 words
A method for compositing a source image and a destination image using a mask image to produce a result image in a digital image processing system comprising: on a pixel-by-pixel basis, combining images using boolean expression according to the formula; result=((1-mask)*source)+(mask*destination); wherein for each said pixel, said combining is done in a color space on a color component by color component basis; and displaying the result image.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-02 | 1998-07-04 | 1999-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-02 | 2002-07-04 | 2003-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-02 | 2006-07-04 | 2007-01-03 | $7700.00 | Window Closed / Lapsed |