Patent EP0552770A2 successfully refreshed from Google Patents.
EP0552770A2
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Apparatus for extracting facial image characteristic points
Assignee: Panasonic Holdings Corp
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Filing: 1993-01-21
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Granted: —
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Expires: 2013-01-21
Abstract
Abstract A facial image picture data is processed by an edge extraction part 2, which performs edge-stressing on the inputted image picture. And then the processed data is converted by a binary level conversion part 3 for each preestimated point of facial elements. The binary converted data is stored in a shape data-base part 4. The stored shape data is updated by an updating part 6. An image picture arithmetic processing part 5 performs time-to-time arithmetic computation of correspondence factors between the data of the binary-leveled edged image picture and the data stored in the shape data-base part 4, and issues an output including extracted data of image characteristic points.
Inventors
- 👤 Yoshiyasu Kado
- 👤 Masamichi Nakagawa
- 👤 Fumio Maehara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:55
CPC Classifications
G; G06; G06T; G06T9/00; A; A61; A61B; A61B5/00; A61B5/117; A61B5/1171; A61B5/1176; G06V; G06V40/00; G06V40/10; G06V40/16; G06V40/168; H; H04; H04N; H04N19/00; H04N19/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
174 words
An apparatus for extracting facial image characteristic points comprising: an image picture input part (1, 101, 102, 104A) wherethrough the facial image data are inputted, an edge extraction part (2, 103, 104B) for performing edge-stressing process on edge parts included in said facial image data to make an edged-image data, a binary level conversion part (3, 103, 104C) for performing conversion of the edged-image data into binary-leveled edged-image data on each preestimated region of facial elements, a shape data-base part (4, 105) which stores a plurality of shape data as reference data-base of the facial elements, a shape data updating part (6, 103) for updating the data in the shape data-base part, an image picture arithmetic processing part (5, 103, 106) for performing the arithmetic computation of the magnitudes of correspondence factors between the binary-leveled edged-image data and said shape data stored in the shape data-base part, and an output part (7, 107) for issuing output data including an information of image characteristic points extracted based on said correspondence factors and said shape data.
Claim 2
Dependent Claim
62 words
An apparatus for extracting facial image characteristic points in accordance with claim 1 which further comprises: a region determination part (8, 103) for fixing a searching region of a facial element wherefrom the first extraction process is performed, the region determination for rest facial elements being carried out based on the position information of the facial element which has been extracted previously.
Claim 3
Dependent Claim
38 words
An apparatus for extracting facial image characteristic points in accordance with claim 2 wherein in the characteristic points extraction process, positions of irises are taken to be an item wherefrom the first characteristic extraction process is carried out.
Claim 4
Dependent Claim
47 words
An apparatus for extracting facial image characteristic points in accordance with claim 2 which further comprises: a process selection part (10, 103) and a binary level conversion part (11, 103) for performing said binary level conversion process in advance to said edge extraction for particular facial elements.
Claim 5
Dependent Claim
66 words
An apparatus for extracting facial image characteristic points in accordance with claim 4 which further comprises: a binary level conversion part (11, 103) in which a preestimated region, wherein the binary level conversion is to be processed, is divided into a plural number of smaller sub-regions, and binary level conversion threshold value for each smaller sub-region is determined from the brightness distribution of each smaller sub-region.
Claim 6
Dependent Claim
51 words
An apparatus for extracting facial image characteristic points in accordance with claim 1 which further comprises: an adoption/rejection part (9, 103) whereby, after obtaining preexpected positions of all the facial elements, said image characteristic points of image picture are extracted by discarding those erroneously extracted facial elements using said adoption/rejection part.
References Cited (Backward Citations)
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