EP0907145A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and equipment for extracting image features from image sequence
Assignee: NTT Inc
•
Filing: 1998-09-28
•
Granted: —
•
Expires: 2018-09-28
Abstract
Abstract A method and an equipment extracts image features from an image sequence in which frames indicating images are time-sequentially arranged with respect to time. The equipment includes a unit for inputting the image sequence, a unit for acquiring a motion trajectory of an image contour of a target included within a region defined by an arbitrary spatial range and time range within the input image sequence, as three-dimensional volume data drawn within a spatiotemporal space in which each of the frames is time-sequentially stacked, a unit for acquiring a plane histogram of one of tangent planes tangent to the motion trajectory and partial planes which may be included in the motion trajectory, and a unit for measuring temporal features and spatial features of the image from the acquired plane histogram. The three-dimensional volume data is obtained by forming difference images among the frames arranged in the time sequence and stacking the formed difference images. The plane histogram is obtained as votes accumulated in a plane parameter space obtained by use of the Hough transform.
Inventors
- 👤 Kazuhiro Nippon Telegr. & Teleph. Corp. Otsuka
- 👤 Tsutomu Nippon Telegr. & Teleph. Corp. Horikoshi
- 👤 Satoshi Nippon Telegr. & Teleph. Corp. Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:08
CPC Classifications
G; G06; G06T; G06T7/00; G06T7/60
Claims Analysis
Total Claims: 57
Claim 1
Independent Claim
115 words
A method for extracting image features
from an image sequence in which frames indicating
images are time-sequentially arranged with respect to
time, characterized in that said method comprising the
steps of: (a) inputting the image sequence; (b) acquiring a motion trajectory of an image
contour of a target included within a region defined
by an arbitrary spatial range and time range within
the image sequence input by said step (a), as three-dimensional
volume data drawn within a spatiotemporal
space in which each of the frames is time-sequentially
stacked; and (c) measuring temporal features and spatial
features of the image from the motion trajectory which
is acquired as the three-dimensional volume data by
said step (b).
Claim 2
Independent Claim
136 words
A method for extracting image features
from an image sequence in which frames indicating
images are time-sequentially arranged with respect to
time, characterized in that said method comprising the
steps of: (a) inputting the image sequence; (b) acquiring a motion trajectory of an image
contour of a target included within a region defined
by an arbitrary spatial range and time range within
the image sequence input by said step (a), as three-dimensional
volume data drawn within a spatiotemporal
space in which each of the frames is time-sequentially
stacked; (c) acquiring a plane histogram of one of
tangent planes tangent to the motion trajectory and
partial planes which may be included in the motion
trajectory; and (d) measuring temporal features and spatial
features of the image from the plane histogram which
is acquired by said step (c).
Claim 3
Independent Claim
179 words
A method for extracting image features
from an image sequence in which frames indicating
images are time-sequentially arranged with respect to
time, characterized in that said method comprising the
steps of: (a) inputting the image sequence; (b) acquiring a motion trajectory of an image
contour of a target included within a region defined
by an arbitrary spatial range and time range within
the image sequence input by said step (a), as three-dimensional
volume data drawn within a spatiotemporal
space in which each of the frames is time-sequentially
stacked; (c) acquiring a plane histogram of tangent
planes tangent to the motion trajectory; (d) estimating a velocity component of the
target which moves within the region from the plane
histogram acquired by said step (c); (e) extracting a distribution of the tangent
planes corresponding to the image contour of the
target which moves at the velocity component estimated
by said step (d), from the plane histogram acquired by
said step (c); and (f) acquiring spatial features of the image from
the distribution of the tangent planes extracted by
said step (e).
Claim 4
Dependent Claim
70 words
The method as claimed in claim 3,
characterized in that said step (d) includes the
substeps of: (d1) acquiring a histogram of intersection lines
of the tangent planes from the plane histogram
acquired by said step (c); and (d2) acquiring, as image features, a most
dominant translational velocity component of the
target which moves within the defined region, from the
histogram of the intersection lines acquired by said
substep (d2).
Claim 5
Dependent Claim
131 words
The method as claimed in claim 3,
characterized in that said step (d) includes the
substeps of: (d1) acquiring a histogram of intersection lines
of the tangent planes from the plane histogram
acquired by said step (c); and (d2) detecting a plurality of peaks from the
histogram of the intersection lines acquired by said
substep (d1); (d3) acquiring velocity components of a plurality
of motions within the region corresponding to the
plurality of peaks detected by said substep (d2); and (d4) judging whether or not each of the velocity
components can be represented by a composite velocity
of other velocity components, with respect to the
velocity components acquired by said substep (d3), and
outputting an independent velocity component which
cannot be represented by the composite velocity of the
other velocity components.
Claim 6
Dependent Claim
60 words
The method as claimed in claim 3,
characterized in that said step (e) extracts a
distribution of tangent planes along tangent line
directions to the image contour of the target, and
said step (f) calculates feature values related to a
directionality of the image contour of the target from
the distribution of the tangent planes extracted by
said step (e).
Claim 7
Dependent Claim
50 words
The method as claimed in claim 3;
characterized in that said step (e) extracts a
distribution of tangent planes in directions
perpendicular to a direction of the image contour of
the target, and said step (f) extracts features
related to a spatial arrangement of the image contour
of the target.
Claim 8
Independent Claim
163 words
A method for extracting image features
from an image sequence in which frames indicating
images are time-sequentially arranged with respect to
time, characterized in that said method comprising the
steps of: (a) inputting the image sequence; (b) acquiring a motion trajectory of an image
contour of a target included within a region defined
by an arbitrary spatial range and time range within
the image sequence input by said step (a), as three-dimensional
volume data drawn within a spatiotemporal
space in which each of the frames is time-sequentially
stacked; (c) acquiring a plane histogram of tangent
planes tangent to the motion trajectory; (d) acquiring a histogram of intersection lines
of the tangent planes from the plane histogram
acquired by said step (c); (e) detecting a plurality of peaks from the
histogram of the intersection lines acquired by said
step (d); and (e) acquiring a plurality of velocity components
of motions within the region corresponding to the
plurality of peaks detected by said step (e).
Claim 9
Dependent Claim
71 words
The method as claimed in claim 8,
characterized in that there are further provided the
steps of: (f) judging whether or not each of the velocity
components can be represented by a composite velocity
of other velocity components, with respect to the
plurality of velocity components acquired by said step
(e); and (g) outputting an independent velocity component
which cannot be represented by the composite velocity
of the other velocity components.
Claim 10
Independent Claim
153 words
A method for extracting image features
from an image sequence in which frames indicating
images are time-sequentially arranged with respect to
time, characterized in that said method comprising the
steps of: (a) inputting the image sequence; (b) acquiring a motion trajectory of an image
contour of a target included within a region defined
by an arbitrary spatial range and time range within
the image sequence input by said step (a), as three-dimensional
volume data drawn within a spatiotemporal
space in which each of the frames is time-sequentially
stacked; (c) acquiring a plane histogram of one of
tangent planes tangent to the motion trajectory and
partial planes which may be included in the motion
trajectory; (d) acquiring a normal flow histogram of normal
flows of the image from the plane histogram acquired
by said step (c); and (e) acquiring temporal features of the image
from the normal flow histogram acquired by said step
(d).
Claim 11
Dependent Claim
48 words
The method as claimed in claim 10,
characterized in that said step (d) acquires a normal
flow histogram having direction and velocity of the
normal flows as variables, and said step (e)
calculates spreading of the normal flow histogram as
feature values representing motion uniformity of the
image.
Claim 12
Dependent Claim
64 words
The method as claimed in claim 10,
characterized in that said step (d) acquires a normal
flow histogram having velocity of the normal flows as
a variable, and said step (e) calculates a ratio of
totalled frequency value corresponding to normal flows
having specific velocities with respect to a totalled
frequency value as a whole as feature values
representing the motion of the image.
Claim 13
Independent Claim
139 words
A method for extracting image features
from an image sequence in which frames indicating
images are time-sequentially arranged with respect to
time, characterized in that said method comprising the
steps of: (a) inputting the image sequence; (b) acquiring a motion trajectory of an image
contour of a target included within a region defined
by an arbitrary spatial range and time range within
the image sequence input by said step (a), as three-dimensional
volume data drawn within a spatiotemporal
space in which each of the frames is time-sequentially
stacked; (c) detecting tangent planes tangent to the
motion trajectory; (d) extracting, as an image, a distribution of
the motion trajectory existing on the tangent planes
detected by said step (c); and (e) tracking a motion trajectory on the image
extracted by said step (d) and detecting an occlusion
of the target.
Claim 14
Dependent Claim
45 words
The method as claimed in claim 13,
characterized in that said step (e) includes the
substeps of: (e1) measuring intermittence along a moving
direction of the motion trajectory; and (e2) detecting the occlusion of the target based
on the intermittence measured by said substep (e1).
Claim 15
Dependent Claim
55 words
The method as claimed in claim 13,
characterized in that said step (e) includes the
substeps of: (e1) measuring statistics of a run length along a
moving direction of the motion trajectory; and (e2) detecting a degree of the occlusion of the
target from the statistics of the run length measured
by said substep (e1).
Claim 16
Dependent Claim
49 words
The method as claimed in claim 13,
characterized in that said step (c) detects the
tangent planes in a form of a histogram of the tangent
planes which are represented as a distribution of
votes accumulated in a plane parameter space obtained
by use of a three-dimensional Hough transform.
Claim 17
Dependent Claim
20 words
The method as claimed in claim 13,
characterized in that said step (c) detects tangent
planes corresponding estimated velocity components.
Claim 18
Independent Claim
40 words
The method as claimed in any of claims
1, 2, 3, 8, 10 and 13, characterized in that the
three-dimensional volume data is obtained by forming
difference images among the frames in time sequence,
and stacking the formed difference images.
Claim 19
Independent Claim
37 words
The method as claimed in any of claims
2, 3, 8 and 10, characterized in that the plane
histogram is obtained as votes accumulated in a plane
parameter space obtained by use of a three-dimensional
Hough transform.
Claim 20
Dependent Claim
116 words
An equipment for extracting image
features from an image sequence in which frames
indicating images are time-sequentially arranged with
respect to time, said equipment characterized by: first means for inputting the image sequence; second means for acquiring a motion trajectory of
an image contour of a target included within a region
defined by an arbitrary spatial range and time range
within the image sequence input by said first means,
as three-dimensional volume data drawn within a
spatiotemporal space in which each of the frames is
time-sequentially stacked; and third means for measuring temporal features and
spatial features of the image from the motion
trajectory which is acquired as the three-dimensional
volume data by said second means.
Claim 21
Dependent Claim
139 words
An equipment for extracting image
features from an image sequence in which frames
indicating images are time-sequentially arranged with
respect to time, said equipment characterized by: first means for inputting the image sequence; second means for acquiring a motion trajectory of
an image contour of a target included within a region
defined by an arbitrary spatial range and time range
within the image sequence input by said first means,
as three-dimensional volume data drawn within a
spatiotemporal space in which each of the frames is
time-sequentially stacked; third means for acquiring a plane histogram of
one of tangent planes tangent to the motion trajectory
and partial planes which may be included in the motion
trajectory; and fourth means for measuring temporal features and
spatial features of the image from the plane histogram
which is acquired by said third means.
Claim 22
Dependent Claim
186 words
An equipment for extracting image
features from an image sequence in which frames
indicating images are time-sequentially arranged with
respect to time, said equipment characterized by: first means for inputting the image sequence; second means for acquiring a motion trajectory of
an image contour of a target included within a region
defined by an arbitrary spatial range and time range
within the image sequence input by said first means,
as three-dimensional volume data drawn within a
spatiotemporal space in which each of the frames is
time-sequentially stacked; third means for acquiring a plane histogram of
tangent planes tangent to the motion trajectory; fourth means for estimating a velocity component
of the target which moves within the region from the
plane histogram acquired by said third means; fifth means for extracting a distribution of the
tangent planes corresponding to the image contour of
the target which moves at the velocity component
estimated by said fourth means, from the plane
histogram acquired by said third means; and sixth means for acquiring spatial features of the
image from the distribution of the tangent planes
extracted by said fifth means.
Claim 23
Dependent Claim
71 words
The equipment as claimed in claim 22,
characterized in that said fourth means includes: seventh means for acquiring a histogram of
intersection lines of the tangent planes from the
plane histogram acquired by said third means; and eighth means for acquiring, as image features, a
most dominant translational velocity component of the
target which moves within the defined region, from the
histogram of the intersection lines acquired by said
seventh means.
Claim 24
Dependent Claim
136 words
The equipment as claimed in claim 22,
characterized in that said fourth means includes: seventh means for acquiring a histogram of
intersection lines of the tangent planes from the
plane histogram acquired by said third means; and eighth means for detecting a plurality of peaks
from the histogram of the intersection lines acquired
by said seventh means; ninth means for acquiring velocity components of
a plurality of motions within the region corresponding
to the plurality of peaks detected by said eighth
means; and tenth means for judging whether or not each of
the velocity components can be represented by a
composite velocity of other velocity components, with
respect to the velocity components acquired by said
ninth means, and outputting an independent velocity
component which cannot be represented by the composite
velocity of the other velocity components.
Claim 25
Dependent Claim
60 words
The equipment as claimed in claim 22,
characterized in that said fifth means extracts a
distribution of tangent planes along tangent line
directions to the image contour of the target, and
said sixth means calculates feature values related to
a directionality of the image contour of the target
from the distribution of the tangent planes extracted
by said fifth means.
Claim 26
Dependent Claim
50 words
The equipment as claimed in claim 22,
characterized in that said fifth means extracts a
distribution of tangent planes in directions
perpendicular to a direction of the image contour of
the target, and said sixth means extracts features
related to a spatial arrangement of the image contour
of the target.
Claim 27
Dependent Claim
170 words
An equipment for extracting image
features from an image sequence in which frames
indicating images are time-sequentially arranged with
respect to time, said equipment characterized by: first means for inputting the image sequence; second means for acquiring a motion trajectory of
an image contour of a target included within a region
defined by an arbitrary spatial range and time range
within the image sequence input by said first means,
as three-dimensional volume data drawn within a
spatiotemporal space in which each of the frames is
time-sequentially stacked; third means for acquiring a plane histogram of
tangent planes tangent to the motion trajectory; fourth means for acquiring a histogram of
intersection lines of the tangent planes from the
plane histogram acquired by said third means; fifth means for detecting a plurality of peaks
from the histogram of the intersection lines acquired
by said fourth means; and sixth means for acquiring a plurality of velocity
components of motions within the region corresponding
to the plurality of peaks detected by said fifth
means.
Claim 28
Dependent Claim
68 words
The equipment as claimed in claim 27,
further characterized by: seventh means for judging whether or not each of
the velocity components can be represented by a
composite velocity of other velocity components, with
respect to the plurality of velocity components
acquired by said fifth means; and eighth means for outputting an independent
velocity component which cannot be represented by the
composite velocity of the other velocity components.
Claim 29
Dependent Claim
158 words
An equipment for extracting image
features from an image sequence in which frames
indicating images are time-sequentially arranged with
respect to time, said equipment characterized by: first means for inputting the image sequence; second means for acquiring a motion trajectory of
an image contour of a target included within a region
defined by an arbitrary spatial range and time range
within the image sequence input by said first means,
as three-dimensional volume data drawn within a
spatiotemporal space in which each of the frames is
time-sequentially stacked; third means for acquiring a plane histogram of
one of tangent planes tangent to the motion trajectory
and partial planes which may be included in the motion
trajectory; fourth means for acquiring a normal flow
histogram of normal flows of the image from the plane
histogram acquired by said third means; and fifth means for acquiring temporal features of
the image from the normal flow histogram acquired by
said fourth means.
Claim 30
Dependent Claim
48 words
The equipment as claimed in claim 29,
characterized in that said fourth means acquires a
normal flow histogram having direction and velocity of
the normal flows as variables, and said fifth means
calculates spreading of the normal flow histogram as
feature values representing motion uniformity of the
image.
Claim 31
Dependent Claim
64 words
The equipment as claimed in claim 29,
characterized in that said fourth means acquires a
normal flow histogram having velocity of the normal
flows as a variable, and said fifth means calculates a
ratio of totalled frequency value corresponding to
normal flows having specific velocities with respect
to a totalled frequency value as a whole as feature
values representing the motion of the image.
Claim 32
Dependent Claim
144 words
An equipment for extracting image
features from an image sequence in which frames
indicating images are time-sequentially arranged with
respect to time, said equipment characterized by: first means for inputting the image sequence; second means for acquiring a motion trajectory of
an image contour of a target included within a region
defined by an arbitrary spatial range and time range
within the image sequence input by said first means,
as three-dimensional volume data drawn within a
spatiotemporal space in which each of the frames is
time-sequentially stacked; third means for detecting tangent planes tangent
to the motion trajectory; fourth means for extracting, as an image, a
distribution of the motion trajectory existing on the
tangent planes detected by said third means; and fifth means for tracking a motion trajectory on
the image extracted by said fourth means and detecting
an occlusion of the target.
Claim 33
Dependent Claim
46 words
The equipment as claimed in claim 32,
characterized in that said fifth means includes: sixth means for measuring intermittence along a
moving direction of the motion trajectory; and seventh means for detecting the occlusion of the
target based on the intermittence measured by said
sixth means.
Claim 34
Dependent Claim
56 words
The equipment as claimed in claim 32,
characterized in that said fifth means includes: sixth means for measuring statistics of a run
length along a moving direction of the motion
trajectory; and seventh means for detecting a degree of the
occlusion of the target from the statistics of the run
length measured by said sixth means.
Claim 35
Dependent Claim
49 words
The equipment as claimed in claim 32,
characterized in that said third means detects the
tangent planes in a form of a histogram of the tangent
planes which are represented as a distribution of
votes accumulated in a plane parameter space obtained
by use of a three-dimensional Hough transform.
Claim 36
Dependent Claim
20 words
The equipment as claimed in claim 32,
characterized in that said third means detects tangent
planes corresponding estimated velocity components.
Claim 37
Dependent Claim
40 words
The equipment as claimed in any of
claims 20, 21, 22, 27, 29 and 32, characterized in
that the three-dimensional volume data is obtained by
forming difference images among the frames in time
sequence, and stacking the formed difference images.
Claim 38
Dependent Claim
37 words
The equipment as claimed in any of
claims 21, 22, 23 and 29, characterized in that the
plane histogram is obtained as votes accumulated in a
plane parameter space obtained by use of a three-dimensional
Hough transform.
Claim 39
Dependent Claim
141 words
A computer-readable recording medium
recorded with a program for causing a computer to
extract image features from an image sequence in which
frames indicating images are time-sequentially
arranged with respect to time, said program
characterized by: a first code for causing the computer to input
the image sequence; a second code for causing the computer to acquire
a motion trajectory of an image contour of a target
included within a region defined by an arbitrary
spatial range and time range within the image sequence
input by said first code, as three-dimensional volume
data drawn within a spatiotemporal space in which each
of the frames is time-sequentially stacked; and a third code for causing the computer to measure
temporal features and spatial features of the image
from the motion trajectory which is acquired as the
three-dimensional volume data by said second code.
Claim 40
Dependent Claim
169 words
A computer-readable recording medium
recorded with a program for causing a computer to
extract image features from an image sequence in which
frames indicating images are time-sequentially
arranged with respect to time, said program
characterized by: a first code for causing the computer to input
the image sequence; a second code for causing the computer to acquire
a motion trajectory of an image contour of a target
included within a region defined by an arbitrary
spatial range and time range within the image sequence
input by said first code, as three-dimensional volume
data drawn within a spatiotemporal space in which each
of the frames is time-sequentially stacked; a third code for causing the computer to acquire
a plane histogram of one of tangent planes tangent to
the motion trajectory and partial planes which may be
included in the motion trajectory; and a fourth code for causing the computer to measure
temporal features and spatial features of the image
from the plane histogram which is acquired by said
third code.
Claim 41
Dependent Claim
226 words
A computer-readable recording medium
recorded with a program for causing a computer to
extract image features from an image sequence in which
frames indicating images are time-sequentially
arranged with respect to time, said program
characterized by: a first code for causing the computer to input
the image sequence; a second code for causing the computer to acquire
a motion trajectory of an image contour of a target
included within a region defined by an arbitrary
spatial range and time range within the image sequence
input by said first code, as three-dimensional volume
data drawn within a spatiotemporal space in which each
of the frames is time-sequentially stacked; a third code for causing the computer to acquire
a plane histogram of tangent planes tangent to the
motion trajectory; a fourth code for causing the computer to
estimate a velocity component of the target which
moves within the region from the plane histogram
acquired by said third code; a fifth code for causing the computer to extract
a distribution of the tangent planes corresponding to
the image contour of the target which moves at the
velocity component estimated by said fourth code, from
the plane histogram acquired by said third code; and a sixth code for causing the computer to acquire
spatial features of the image from the distribution of
the tangent planes extracted by said fifth code.
Claim 42
Dependent Claim
82 words
The computer-readable recording medium
as claimed in claim 41, characterized in that said
fourth code includes: seventh code for causing the computer to acquire
a histogram of intersection lines of the tangent
planes from the plane histogram acquired by said third
code; and an eighth code for causing the computer to
acquire, as image features, a most dominant
translational velocity component of the target which
moves within the defined region, from the histogram of
the intersection lines acquired by said seventh code.
Claim 43
Dependent Claim
157 words
The computer-readable recording medium
as claimed in claim 41, characterized in that said
fourth code includes: a seventh code for causing the computer to
acquire a histogram of intersection lines of the
tangent planes from the plane histogram acquired by
said third code; and an eighth code for causing the computer to detect
a plurality of peaks from the histogram of the
intersection lines acquired by said seventh code; a ninth code for causing the computer to acquire
velocity components of a plurality of motions within
the region corresponding to the plurality of peaks
detected by said eighth code; and a tenth code for causing the computer to judge
whether or not each of the velocity components can be
represented by a composite velocity of other velocity
components, with respect to the velocity components
acquired by said ninth code, and output an independent
velocity component which cannot be represented'by the
composite velocity of the other velocity components.
Claim 44
Dependent Claim
70 words
The computer-readable recording medium
as claimed in claim 41, characterized in that said
fifth code causes the computer to extract a
distribution of tangent planes along tangent line
directions to the image contour of the target, and
said sixth code causes the computer to calculate
feature values related to a directionality of the
image contour of the target from the distribution of
the tangent planes extracted by said fifth code.
Claim 45
Dependent Claim
60 words
The computer-readable recording medium
as claimed in claim 41, characterized in that said
fifth code causes the computer to extract a
distribution of tangent planes in directions
perpendicular to a direction of the image contour of
the target, and said sixth code causes the computer to
extract features related to a spatial arrangement of
the image contour of the target.
Claim 46
Dependent Claim
210 words
A computer-readable recording medium
recorded with a program for causing a computer to
extract image features from an image sequence in which
frames indicating images are time-sequentially
arranged with respect to time, said program
characterized by: a first code for causing the computer to input
the image sequence; a second code for causing the computer to acquire
a motion trajectory of an image contour of a target
included within a region defined by an arbitrary
spatial range and time range within the image sequence
input by said first code, as three-dimensional volume
data drawn within a spatiotemporal space in which each
of the frames is time-sequentially stacked; a third code for causing the computer to acquire
a plane histogram of tangent planes tangent to the
motion trajectory; a fourth code for causing the computer to acquire
a histogram of intersection lines of the tangent
planes from the plane histogram acquired by said third
code; a fifth code for causing the computer to detect a
plurality of peaks from the histogram of the
intersection lines acquired by said fourth code; and a sixth code for causing the computer to acquire
a plurality of velocity components of motions within
the region corresponding to the plurality of peaks
detected by said fifth code.
Claim 47
Dependent Claim
84 words
The computer-readable recording medium
as claimed in claim 46, characterized in that said
program further comprises: a seventh code for causing the computer to judge
whether or not each of the velocity components can be
represented by a composite velocity of other velocity
components, with respect to the plurality of velocity
components acquired by said fifth code; and an eighth code for causing the computer to output
an independent velocity component which cannot be
represented by the composite velocity of the other
velocity components.
Claim 48
Dependent Claim
193 words
A computer-readable recording medium
recorded with a program for causing a computer to
extract image features from an image sequence in which
frames indicating images are time-sequentially
arranged with respect to time, said program
characterized by: a first code for causing the computer to input
the image sequence; a second code for causing the computer to acquire
a motion trajectory of an image contour of a target
included within a region defined by an arbitrary
spatial range and time range within the image sequence
input by said first code, as three-dimensional volume
data drawn within a spatiotemporal space in which each
of the frames is time-sequentially stacked; a third code for causing the computer to acquire
a plane histogram of one of tangent planes tangent to
the motion trajectory and partial planes which may be
included in the motion trajectory; a fourth code for causing the computer to acquire
a normal flow histogram of normal flows of the image
from the plane histogram acquired by said third code;
and a fifth code for causing the computer to acquire
temporal features of the image from the normal flow
histogram acquired by said fourth code.
Claim 49
Dependent Claim
58 words
The computer-readable recording medium
as claimed in claim 48, characterized in that said
fourth code causes the computer to acquire a normal
flow histogram having direction and velocity of the
normal flows as variables, and said fifth code causes
the computer to calculate spreading of the normal flow
histogram as feature values representing motion
uniformity of the image.
Claim 50
Dependent Claim
74 words
The computer-readable recording medium
as claimed in claim 48, characterized in that said
fourth code causes the computer to acquire a normal
flow histogram having velocity of the normal flows as
a variable, and said fifth code causes the computer to
calculate a ratio of totalled frequency value
corresponding to normal flows having specific
velocities with respect to a totalled frequency value
as a whole as feature values representing the motion
of the image.
Claim 51
Dependent Claim
179 words
A computer-readable recording medium
recorded with a program for causing a computer to
extract image features from an image sequence in which
frames indicating images are time-sequentially
arranged with respect to time, said program
characterized by: a first code for causing the computer to input
the image sequence; a second code for causing the computer to acquire
a motion trajectory of an image contour of a target
included within a region defined by an arbitrary
spatial range and time range within the image sequence
input by said first code, as three-dimensional volume
data drawn within a spatiotemporal space in which each
of the frames is time-sequentially stacked; a third code for causing the computer to detect
tangent planes tangent to the motion trajectory; a fourth code for causing the computer to
extract, as an image, a distribution of the motion
trajectory existing on the tangent planes detected by
said third code; and a fifth code for causing the computer to track a
motion trajectory on the image extracted by said
fourth code and detecting an occlusion of the target.
Claim 52
Dependent Claim
58 words
The computer-readable recording medium
as claimed in claim 51, characterized in that said
fifth code includes: a sixth code for causing the computer to measure
intermittence along a moving direction of the motion
trajectory; and a seventh code for causing the computer to detect
the occlusion of the target based on the intermittence
measured by said sixth code.
Claim 53
Dependent Claim
68 words
The computer-readable recording medium
as claimed in claim 51, characterized in that said
fifth code includes: a sixth code for causing the computer to measure
statistics of a run length along a moving direction of
the motion trajectory; and a seventh code for causing the computer to detect
a degree of the occlusion of the target from the
statistics of the run length measured by said sixth
code.
Claim 54
Dependent Claim
55 words
The computer-readable recording medium
as claimed in claim 51, characterized in that said
third code causes the computer to detect the tangent
planes in a form of a histogram of the tangent planes
which are represented as a distribution of votes
accumulated in a plane parameter space obtained by use
of a three-dimensional Hough transform.
Claim 55
Dependent Claim
26 words
The computer-readable recording medium
as claimed in claim 51, characterized in that said
third code causes the computer to detect tangent
planes corresponding estimated velocity components.
Claim 56
Dependent Claim
42 words
The computer-readable recording medium
as claimed in any of claims 39, 40, 41, 46, 48 and 51,
characterized in that the three-dimensional volume
data is obtained by forming difference images among
the frames in time sequence, and stacking the formed
difference images.
Claim 57
Dependent Claim
40 words
The computer-readable recording medium
as claimed in any of claims 40, 41, 42, 46 and 48,
characterized in that the plane histogram is obtained
as votes accumulated in a plane parameter space
obtained by use of a three-dimensional Hough
transform.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.