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US5748776A
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Feature-region extraction method and feature-region extraction circuit
Assignee: Sharp Corp
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Filing: 1996-07-05
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Granted: 1998-05-05
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Expires: 2016-07-05
Abstract
Abstract The present invention is intended to exactly extract a feature-region along its contour line without erroneously extracting any moving object other than the feature-region. An extraction signal from a feature-region main-portion extracting circuit is sent to a small region eliminating circuit whereby an erroneously extracted small region is detected and eliminated as an erroneously extracted noisy portion. The small region eliminating circuit compares a small region with four predetermined detection patterns, discriminates it as a region other than the feature (face)-region if no match is found and causes a center pixel of a window of 3×3 pixels to have a logical value of zero. An output of the small region eliminating circuit is sent to a blank filling circuit which compares its input with four predetermined detection patterns, discriminates it as a face-region if a match is found and makes a central pixel of a window of 13×13 pixels have a logical value of 1. The above-mentioned extraction method can reliably extract features of the face-region and is free from the erroneous extraction of any moving object other than the face.
Inventors
- 👤 Shigeo Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:17
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/14; H04N7/141; H04N7/148; G; G06; G06T; G06T7/00; G06T7/10; G06T7/11; G06T7/90; G06V; G06V10/00; G06V10/20; G06V10/26; G06V10/267; G06V10/40; G06V10/42; G06V10/421; G06V40/00; G06V40/10; G06V40/16; G06V40/161; G06V40/162; G06T2207/00; G06T2207/10; G06T2207/10016; G06T2207/10024; G06T2207/30; G06T2207/30196; G06T2207/30201; H04N19/00; H04N19/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
153 words
A method of extracting a feature-region from a color image for purposes of image transmission in a transmission system having finite transmission capacity, comprising the steps of: defining a color difference coordinate system having two axes, and representing each pixel of said color image by two respective color difference signals in said system; identifying at least one region of contiguous pixels, based on whether their color difference signal values fall within a predetermined value range, as a small color difference region defined within said color difference coordinate system; extracting an image region having color difference signals within said color difference region as the feature-region to which to apply preferential treatment, compared to a remaining portion of said color image; and allocating a greater part of said finite information transmission capacity to said extracted feature-region as said preferential treatment, and a remaining part of said capacity to a non-extracted portion of said color image.
Claim 2
Independent Claim
153 words
A method of extracting a feature-region from a color image for purposes of image transmission in a transmission system having finite transmission capacity, comprising the steps of: defining a color difference coordinate system having two axes, and representing each pixel of said color image by two respective color difference signals in said system; identifying at least one region of contiguous pixels, based on whether their color difference signal values fall within a predetermined value range, as a small color difference region defined within said color difference coordinate system; extracting an image region having color difference signals within said color difference region as the feature-region to which to apply preferential treatment, compared to a remaining portion of said color image; and allocating a greater part of said finite information transmission capacity to said extracted feature-region as said preferential treatment, and a remaining part of said capacity to a non-extracted portion of said color image.
Claim 3
Dependent Claim
60 words
A method according to claim 1 which predetermines a small color difference region including feature color difference signals of a feature-region within a color difference coordinate system having two axes, each axis representing a respective color difference signal, and extracts, as the feature-region, an image region having a color difference component in the predetermined small color difference region mentioned above.
Claim 4
Dependent Claim
47 words
A method of extracting a feature-region from a color image, according to claim 2, wherein the predetermined small color difference region is a common region of two color difference signals, which are respectively binary signals, digitized by respective specified thresholds and wherein the feature-region is extracted therefrom.
Claim 5
Dependent Claim
37 words
A method according to claim 1, which extracts a feature-region along its contour line, together with dropout regions, which do not satisfy said predetermined criteria, but which are enclosed within the feature contour line of the feature-region.
Claim 6
Dependent Claim
31 words
A method according to claim 3, wherein any dropout regions within the feature-region are filled in by applying predetermined detection patterns which consist of nearby pixels, and are weighted by distance.
Claim 7
Dependent Claim
28 words
A method of extracting a feature-region from a color image, according to claim 2, wherein the feature-region is extracted from a plurality of predetermined small color difference regions.
Claim 8
Dependent Claim
28 words
A method of extracting a feature-region from a color image, according to claim 3, wherein the feature-region is extracted from a plurality of predetermined small color difference regions.
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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) | 2001-05-04 | 2001-11-03 | 2002-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-04 | 2005-11-03 | 2006-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-04 | 2009-11-03 | 2010-05-05 | $7700.00 | Window Closed / Lapsed |