EP0899685B1
Expired / Lapsed
EP
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Image processing apparatus for discriminating image field of original document plural times and method therefor
Assignee: Toshiba Corp
•
Filing: 1998-08-19
•
Granted: 2002-10-23
•
Expires: 2018-08-19
Abstract
No abstract record available.
Inventors
- 👤 Naofumi Yamamoto
- 👤 Haruko Kawakami
- 👤 Gururaj Rao
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 10:26
CPC Classifications
G; G06; G06T; G06T7/00; G06T7/10; G06T7/11; G06V; G06V30/00; G06V30/10; G06V30/16; G06V30/162; G06V30/18; G06V30/18105; G06V30/40; G06V30/41; G06V30/414; G06T2207/00; G06T2207/10; G06T2207/10004; G06T2207/10008; G06T2207/30; G06T2207/30176
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
148 words
An image processing apparatus, comprising field separating means (1201) for separating an original
image into fields of a plurality of different types in response
to a first image signal obtained at a first resolution of the
original image, characteristic value calculating means (1202, 1311) for
calculating a characteristic value of the original image in
response to a second image signal of the original image
obtained at a second resolution which is higher than the first
resolution, discrimination means (1312, 1313) for discriminating an
image field of the original image in accordance with the
characteristic value calculated by the characteristic value calculating means and the type
of the image field as separated by the field separating means,
and an image processing means (1004) for performing a
predetermined image processing corresponding to the result of
discrimination of the image field performed by the
discrimination means, on the second image signal.
Claim 2
Dependent Claim
46 words
An image processing apparatus according to claim 1, characterized in that each of the field separation means and
the characteristic value calculating means further includes
scanning means (1001) for scanning the original image at the
first resolution and then scanning the same at the second
resolution.
Claim 3
Dependent Claim
45 words
An image processing apparatus according to claim 1 or
2, characterized in that the field separating means includes means (1201) for separating the original image into at
least a usual character field, characters on a background, a
continuous gradation field and a dot gradation field.
Claim 4
Dependent Claim
52 words
An image processing apparatus according to one of
claims 1 to 3, characterized by means for deleting a gradation
image existing in a field which has not been discriminated by
the field separating means as a gradation field and a gradation
image existing in a field discriminated as a continuous
gradation field.
Claim 5
Dependent Claim
68 words
An image processing apparatus according to one of
claims 1 to 4, characterized in that the characteristic value
calculating means (1202, 1311) includes means (1311a-c) for
calculating a change in the density, an average
density and chroma which are characteristic values of
the original image in response to the second image signal of
the original image obtained at the second resolution which is
higher than the first resolution.
Claim 6
Dependent Claim
73 words
An image processing apparatus according to one of
claims 1 to 5, characterized in that the characteristic value
calculating means (1202, 1311) includes means for calculating a characteristic value of the
original image in each of unit regions having different lengths
in a main scanning direction and a sub-scanning direction in
response to the second image signal of the original image
obtained at the second resolution which is higher than the
first resolution.
Claim 7
Dependent Claim
63 words
An image processing apparatus according to one of
claims 1 to 6, characterized in that the discrimination means
includes second discrimination means (1312, 1313) for
discriminating the image field of the original image by means
of comparing the characteristic value calculated by the
characteristic value calculating means with a threshold value
corresponding to the type of the field separated by the
separating means.
Claim 8
Dependent Claim
74 words
An image processing apparatus according to one of
claims 1 to 4, characterized in that the characteristic value
calculating means includes a second characteristic value calculating means (2201,
2202) for calculating a segment component of the original image
in a main scanning direction and a sub-scanning direction as
the characteristic value in response to the second image signal
of the original image obtained at the second resolution which
is higher than the first resolution.
Claim 9
Dependent Claim
150 words
An image processing method comprising: a field separating step (S1, S2, S3) for separating an
original image into fields of a plurality of different types in
response to a first image signal obtained at a first resolution
of the original image; a characteristic value calculating step (S9) for
calculating a characteristic value of the original image in
response to a second image signal of the original image
obtained at a second resolution which is higher than the first
resolution; a discrimination step (S10) for discriminating an image
field of the original image in accordance with the
characteristic value calculated in the characteristic value
calculating step and the type of the image field as
separated in the field separating step; and an image processing step for performing a predetermined
image processing corresponding to the result of discrimination
of the image field performed by the discrimination step, on
the second image signal.
Claim 10
Dependent Claim
47 words
An image processing method according to claim 9, characterized in that each of the field separation step and
characteristic value calculating step further includes a
scanning step (S1, S7) for scanning the original image at the
first resolution and then scanning the same at the second
resolution.
Claim 11
Dependent Claim
48 words
An image processing method according to claim 9 or 10, characterized in that the field separating step includes a step (S1, S2, S3) for separating the original image into
at least a usual character field, characters on a background, a
continuous gradation field and a dot gradation field.
Claim 12
Dependent Claim
56 words
An image processing method according to one of claims
9 to 11, characterized by a step (S401 to S409) of deleting a
gradation image existing in a field which has not been
discriminated in the field separating step as a gradation field
and a gradation image existing in a field discriminated as a
continuous gradation field.
Claim 13
Dependent Claim
68 words
An image processing method according to one of claims
9 to 12, characterized in that the characteristic value
calculating steps includes a step (S9) for calculating a change in a density
, an average density and chroma which are
characteristic values of the original image in response to the
second image signal of the original image obtained at the
second resolution which is higher than the first resolution.
Claim 14
Dependent Claim
73 words
An image processing method according to one of claims
9 to 13, characterized in that the characteristic value
calculating step includes a step (S9) for calculating a characteristic value of the
original image in each of unit regions having different lengths
in a main scanning direction and a sub-scanning direction in
respond to the second image signal of the original image
obtained at the second resolution which is higher than the
first resolution.
Claim 15
Dependent Claim
63 words
An image processing method according to one of claims
9 to 14, characterized in that the discrimination step includes a second discrimination step (S10) for
discriminating the image field of the original image by means
of comparing the characteristic value calculated by the
characteristic value calculating step with a threshold value
corresponding to the type of the field separated by the
separating step.
Claim 16
Dependent Claim
75 words
An image processing method according to one of claims
1 to 12, characterized in that the characteristic value
calculating step includes a second characteristic value calculating step (S9) for
calculating a segment component of the original image in a main
scanning direction and a sub-scanning direction as the
characteristic value in response to the second image signal of
the original image obtained at the second pixel density which
is higher than the first pixel density.
References Cited (Backward Citations)
US4782399A
Cited
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