EP0635981A1
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EP
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Feature-region extraction method and feature-region extraction circuit
Assignee: Sharp Corp
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Filing: 1994-07-05
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Granted: —
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Expires: 2014-07-05
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(1) is sent to a small region eliminating circuit (2) whereby an erroneously extracted small region is detected and eliminated as an erroneously extracted noisy portion. The small region eliminating circuit(2) compares a small region with four 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 (2) is sent to a blank filling circuit (3) which compares its input with four 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
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:51
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: 11
Claim 1
Independent Claim
78 words
A method of feature-region extraction which comprises extracting a feature-region of an image when processing the image according to its feature, characterized by the step of determining a small color difference region including a feature color difference component of a feature-region within a color difference coordinate system defined by two axes representing two respective color difference signals and extracting an image region having a color difference component in the small color difference region mentioned above as the feature-region.
Claim 2
Dependent Claim
36 words
A method of feature-region extraction according to claim 1, characterized by the small color difference region is a common region of two color difference signals binarized by respective specified thresholds where the feature-region is extracted therefrom.
Claim 3
Independent Claim
28 words
A method of feature-region extraction according to any one of claims 1 and 2, characterized by the feature-region is extracted from a plurality of small color difference regions.
Claim 4
Independent Claim
52 words
A method of feature-region extraction with comprises extracting a feature-region of an image when processing the image according to its feature, characterized by the step of extracting a feature-region along its contour line together with a feature lacking region sandwiched in between the feature contour line of the feature-region as a feature-region.
Claim 5
Independent Claim
63 words
A method of feature-region extraction which comprises extracting a feature-region of an image when processing the image according to its feature, characterized by a feature-region is extracted from a common region of two color difference signals of an image, said signals being binarized by specified thresholds, and a lacking region within the feature-region is filled up by using detection patterns weighted by distance.
Claim 6
Independent Claim
81 words
A method of feature-region extraction which comprises extracting a feature-region of an image when processing the image according to its feature, characterized by the step of extracting a feature-region by using a means for extracting it and a memory means for storing the feature-region extraction signal, uses a criterion provided with a hysteresis characteristic depending upon whether a pixel of a frame backed by L frames (L is a positive integer) and/or the adjoining pixel relates to a feature-region or not.
Claim 7
Independent Claim
62 words
A method of feature-region extraction with comprises extracting a feature-region of an image when processing the image according to its feature, characterized by the step of extracting a feature-region by using its characteristic; generates the feature-region extraction signals of frames from a memory of M frames (M is a positive integer), weights the frame feature-region extraction signals and extracts a weighted feature-region.
Claim 8
Dependent Claim
71 words
A feature-region extraction circuit with comprises extracting a feature-region of an image when processing the image according to its feature, characterized by a feature-region main-portion extracting circuit(1) for extracting an image region having a feature color difference component of a feature-region and a blank filling circuit(3) for filling a feature color lacking region which is a part of the feature-region and includes a color difference component other than the feature one.
Claim 9
Dependent Claim
57 words
A feature-region extraction circuit according to claim 8, characterized by the feature-region main-portion extracting circuit(1) comprising a comparison circuit(5),(6),(7),(8) for comparing two color difference signals with an upper limit threshold and a lower limit threshold, and an AND gate(9) circuit for determining the logical product of outputs of the comparison circuit(5),(6),(7),(8) and for extracting a common region.
Claim 10
Dependent Claim
142 words
A feature-region extraction circuit according to claim 8, characterized by the feature-region main-portion extracting circuit(1) is comprising a first comparison circuit(10),(11),(12),(13) for comparing two color difference signals with a first upper limit threshold and a first lower limit threshold; a first AND gate circuit(14) for determining the logical product of the outputs of the first comparison circuit(10),(11),(12),(13) and for extracting a common region; a second comparison circuit(15),(16),(17),(18) for comparing two color difference signals with a second upper limit threshold and a second lower limit threshold; a second AND gate circuit(19) for determining a logical product of the outputs of the second comparison circuit(15),(16),(17),(18) and for extracting a common region; and an OR gate circuit(20) for determining the logical sum of the first comparison circuit's output and the second comparison circuit's output and for extracting feature region distributed to a plurality of regions.
Claim 11
Independent Claim
89 words
A method of identifying a feature region in a video image comprising processing colour component signals (U,V) derived from a video signal representing said video image so as to detect a said feature region as a region in which the image colour produces for each said colour component signal a signal value lying within a predetermined range (C LU -C HU ,C LV -C HV ) or ranges (C LU1 -C HU1 /C LU2 -C HU2 ,C LV1 -C HV1 /C LV2 -C HV2 ) associated with that component.
References Cited (Backward Citations)
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