US5767978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image segmentation system
Assignee: Xerox Corp
•
Filing: 1997-01-21
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Granted: 1998-06-16
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Expires: 2017-01-21
Abstract
Abstract An adaptable image segmentation system for differentially rendering black and white and/or color images using a plurality of imaging techniques. An image is segmented according to classes of regions that may be rendered according to the same imaging techniques. Image regions may be rendered according to a three class system (such as traditional text, graphic and picture systems), or according to more than three image classes. In addition, only two image classes may be required to render high quality draft or final output images. The image characteristics that may be rendered differently from class to class may include halftoning, colorization and other image attributes.
Inventors
- 👤 Shriram V. Revankar
- 👤 Zhigang Fan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:28
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40062
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
151 words
An image rendering system for processing a stream of data in a document processing system, said stream of data including segmentable imaging data for rendering an output image, said output image capable of being differentially rendered according to a plurality of image classes, said image rendering system comprising: a segmentor for dividing the imaging data into a plurality of image regions; a selector for assigning said regions to each image class; and a processor, responsive to said selector, for differentially rendering the output image according to at least one of the plurality of image classes; said segmentor including, a transition intensity detector for determining a set of edges of each segmented region, and an image intensity detector for determining an image edge intensity of each image region in the set of edges of each region wherein the image edge intensity is used to assign each image region to each image class.
Claim 2
Dependent Claim
151 words
An image rendering system for processing a stream of data in a document processing system, said stream of data including segmentable imaging data for rendering an output image, said output image capable of being differentially rendered according to a plurality of image classes, said image rendering system comprising: a segmentor for dividing the imaging data into a plurality of image regions; a selector for assigning said regions to each image class; and a processor, responsive to said selector, for differentially rendering the output image according to at least one of the plurality of image classes; said segmentor including, a transition intensity detector for determining a set of edges of each segmented region, and an image intensity detector for determining an image edge intensity of each image region in the set of edges of each region wherein the image edge intensity is used to assign each image region to each image class.
Claim 3
Dependent Claim
26 words
The system of claim 1, wherein the image classes include a text class image type, a graphic class image type and a pictorial class image type.
Claim 4
Dependent Claim
35 words
The system of claim 1, wherein at least one image class includes at least two image types selected from the group of: a text image type; a graphic image type; and a pictorial image type.
Claim 5
Dependent Claim
32 words
The system of claim 1, wherein said transition intensity detector labels each region according to a plurality of predetermined intensity ranges for assignment with to one of the plurality of image classes.
Claim 6
Dependent Claim
22 words
The system of claim 4, wherein predetermined intensity ranges include a strong edge pixels, weak edge pixels and very weak edge pixels.
Claim 7
Dependent Claim
26 words
The system of claim 1, wherein at least one first image class is determined and wherein at least one second image class is selected by default.
Claim 8
Dependent Claim
22 words
The system of claim 6, wherein the at least one second image class selected by default is a graphical type image class.
Claim 9
Dependent Claim
16 words
The system of claim 1, wherein each image region includes a selected block size of pixels.
Claim 10
Dependent Claim
13 words
The system of claim 8, wherein the block size of pixels is predetermined.
Claim 11
Dependent Claim
13 words
The system of claim 8, wherein the block size of pixels is variable.
Claim 12
Dependent Claim
15 words
The system of claim 1, wherein a halftoning sheme is assigned to each image class.
Claim 13
Dependent Claim
15 words
The system of claim 1, wherein a colorization scheme is assigned to each image class.
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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) | 2001-06-15 | 2001-12-15 | 2002-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-15 | 2005-12-15 | 2006-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-15 | 2009-12-15 | 2010-06-16 | $7700.00 | Window Closed / Lapsed |