EP1107166A2
Expired / Lapsed
EP
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Device and method for face image extraction, and recording medium having recorded program for the method
Assignee: Panasonic Corp
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Filing: 2000-11-29
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Granted: —
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Expires: 2020-11-29
Abstract
Abstract In a broadly-applicable face image extraction device and method for defining a face by position and size in target images varied in type for face image extraction at high speed, an edge extraction part (1) extracts an edge part from a target image and generates an edge image. A template storage part (2) previously stores a template composed of a plurality of concentric shapes varied in size. A voting result storage part (3) has voting storage regions for each size of the concentric shapes of the template so as to store the result obtained by voting processing carried out by a voting part (4). The voting part (4) carries out the voting processing utilizing the template at each pixel in the edge image, and stores the result obtained thereby in the corresponding voting storage region. After the voting processing, an analysis part (5) performs cluster evaluation based on the voting results stored in the voting storage regions, and then defines the face in the target image by position and size.
Inventors
- 👤 Hideaki Matsuo
- 👤 Kazuyuki Imagawa
- 👤 Yuji Takata
- 👤 Naruatsu Baba
- 👤 Toshiaki Ejima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:10
CPC Classifications
G; G06; G06V; G06V40/00; G06V40/10; G06V40/16; G06V40/161; G06V40/162; G06V10/00; G06V10/40; G06V10/48
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
179 words
A face image extraction device for defining a face
in a target image by position and size for extraction, comprising: an edge extraction part (1) for extracting an edge part
(pixels outlining a person or face) from said target image, and
generating an image having only the edge part (hereinafter, edge
image) ; a template storage part (2) for storing a template composed
of a plurality of predetermined concentric shapes equal in shape
but varied in size; a voting result storage part (3) for storing, in a
interrelating manner, voting values and coordinates of pixels on
said edge image for every size of the concentric shapes of said
template; a voting part (4) for increasing or decreasing said voting
values of every pixel, specified by the coordinates, outlining
each of said concentric shapes every time a center point of said
template moves on the pixels in said edge part; and an analysis part (5) for defining the face in said target
image by position and size based on said voting values stored in
said voting result storage part (3).
Claim 2
Dependent Claim
17 words
The face image extraction device according to claim 1,
wherein said predetermined concentric shape is a circle.
Claim 3
Dependent Claim
17 words
The face image extraction device according to claim 1,
wherein said predetermined concentric shape is an ellipse.
Claim 4
Dependent Claim
17 words
The face image extraction device according to claim 1,
wherein said predetermined concentric shape is a polygon.
Claim 5
Dependent Claim
32 words
The face image extraction device according to claim 1,
wherein said edge extraction part (1) extracts said edge part from
said target image by using a filter for a high frequency component.
Claim 6
Dependent Claim
57 words
The face image extraction device according to claim 1,
wherein, when said target image is structured by a plurality of
successive images, said edge extraction part (1) extracts said
edge part by comparing a current image with another image
temporally before, and with after to calculate a difference
therebetween, respectively, for every image structuring said
target image.
Claim 7
Dependent Claim
52 words
The face image extraction device according to claim 1,
wherein said edge extraction part (1) detects, with respect to
pixels extracted in every predetermined box, one pixel located
far-left end or far-right end in the box on a scanning line basis,
and regards only the pixels detected thereby as said edge part.
Claim 8
Dependent Claim
46 words
The face image extraction device according to claim 1,
wherein said analysis part (5) performs clustering with respect
to said voting values stored in each of said voting result storage
parts (3) , and narrows down position and size of the face in said
target image.
Claim 9
Dependent Claim
47 words
The face image extraction device according to claim 1,
further comprising an image editing part (6) for editing said
target image in a predetermined manner by distinguishing a face
region defined by position and size in said analysis part (5) from
the rest in the target image.
Claim 10
Dependent Claim
36 words
The face image extraction device according to claim
1, further comprising an image editing part (6) for replacing an
image of the face region defined by position and size by said
analysis part (5) with another.
Claim 11
Dependent Claim
168 words
A face image extraction method for defining a face in
a target image by position and size for extraction, comprising: an extraction step of extracting an edge part (pixels
outlining a person or face) from said target image, and generating
an image having only the edge part (hereinafter, edge image) ; a first storage step of storing a template composed of a
plurality of predetermined concentric shapes equal in shape but
varied in size; a second storage step of storing, in a interrelating manner,
voting values and coordinates of pixels on said edge image for
every size of the concentric shapes of said template; a voting step of increasing or decreasing said voting values
of every pixel, specified by the coordinates, outlining each of
said concentric shapes every time a center point of said template
moves on the pixels in said edge part; and an analysis step of defining, after said voting step, the
face in said target image by position and size based on said voting
values.
Claim 12
Dependent Claim
17 words
The face image extraction method according to claim
11, wherein said predetermined concentric shape is a circle.
Claim 13
Dependent Claim
17 words
The face image extraction method according to claim
11, wherein said predetermined concentric shape is an ellipse.
Claim 14
Dependent Claim
17 words
The face image extraction method according to claim
11, wherein said predetermined concentric shape is a polygon.
Claim 15
Dependent Claim
32 words
The face image extraction device according to claim
11, wherein, in said extraction step, said edge part is extracted
from said target image by using a filter for a high frequency
component.
Claim 16
Dependent Claim
57 words
The face image extraction method according to claim
11, wherein, in said extraction step, when said target image is
structured by a plurality of successive images, said edge part
is extracted by comparing a current image with another image
temporally before, and with after to calculate a difference
therebetween, respectively, for every image structuring said
target image.
Claim 17
Dependent Claim
53 words
The face image extraction method according to claim
11, wherein, in said extraction step, with respect to pixels
extracted in every predetermined box, one pixel located far-left
end or far-right end in the box is detected on a scanning line
basis, and only the pixels detected thereby is regarded as said
edge part.
Claim 18
Dependent Claim
46 words
The face image extraction method according to claim
11, wherein, in said analysis step, clustering is performed with
respect to said voting values stored in each of said voting result
storage parts, and position and size of the face is narrowed down
in said target image.
Claim 19
Dependent Claim
178 words
A recording medium having recorded a face image
extraction method for defining a face in a target image by position
and size as a program executable on a computer device, the program
at least comprising: a extraction step of extracting an edge part (pixels
outlining a person or face) from said target image, and generating
an image having only the edge part (hereinafter, edge image); a first storage step of storing a template composed of a
plurality of predetermined concentric shapes equal in shape but
varied in size; a second storage part of storing, in a interrelating manner,
voting values and coordinates of pixels on said edge image for
every size of the concentric shapes of said template; a voting step of increasing or decreasing said voting values
of every pixel outlining each of said concentric shapes every time
a center point of said template moves on the pixel in said edge
part; and an analysis step of defining, after said voting step, the
face in said target image by position and size based on said voting
values.
References Cited (Backward Citations)
No citation records indexed.
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