EP0898414A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Image area judging apparatus
Assignee: Sharp Corp
•
Filing: 1998-07-20
•
Granted: —
•
Expires: 2018-07-20
Abstract
Abstract The read out image data is stored in the mask memory in a predetermined mask unit, and binarized into binary value with a predetermined threshold in the binarizing circuit. The binarized image data is output to the main scanning direction-black pixel counting circuit and the sub scanning direction-black pixel counting circuit, respectively, to count black pixels in the main scanning direction and in the sub scanning direction, respectively. The largest value is determined by the comparator, and designated as the linkage degree. With the judging circuit, the area judgement of the character area, the photograph area and the dot area is performed based on the linkage degree.
Inventors
- 👤 Mihoko Tanimura
- 👤 Mitsuru Tokuyama
- 👤 Masatsugu Nakamura
- 👤 Masaaki Ohtsuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 10:03
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40062
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
114 words
An area judging apparatus for judging multiple
areas including character portions, photograph portions and
dot portions, comprising: binarizing means which designates a block of a
predetermined number of pixels centering around target
pixels among the image data as a mask, and compares the pixels
in said mask with a threshold to binarize it into binary value; linkage degree-calculating means for calculating the
linkage degree indicating the linking condition of black
pixels, based on the number of black pixels for each line
in each direction in said binarizing mask; and area judging means for designating said linkage degree
as a characteristic value, and judging an area of said target
pixels based on the characteristic value.
Claim 2
Dependent Claim
137 words
An area judging apparatus for judging multiple
areas including character portions, photograph portions and
dot portions, comprising: binarizing means which designates a block of a
predetermined number of pixels centering around target
pixels among the image data as a mask, and compares the pixels
in said mask with a threshold to binarize it into binary
values; linkage degree-calculating means for calculating the
linkage degree indicating the linking condition of black
pixels, based on the number of black pixels for each line
in each direction in said binarizing mask; density parameter-calculating means for calculating
the density parameter from the density of the black pixels
in said binarizing mask; and area judging means for designating said linkage degree
and said density parameter as the characteristic value, and
judging an area of said target pixels based on the
characteristic value.
Claim 3
Dependent Claim
31 words
An area judging apparatus according to claim 2,
wherein said density parameter-calculating means designates
(maximum value - minimum value) of the density of pixels in
said mask as the density parameter.
Claim 4
Dependent Claim
53 words
An area judging apparatus according to claim 2,
wherein said density parameter-calculating means calculates
the sum total of the difference in the density of successive
2 pixels, with respect to the main scanning direction and
in the sub scanning direction in said mask, respectively,
and designates the smaller one as the density parameter.
Claim 5
Dependent Claim
66 words
An area judging apparatus according to claim 2,
wherein said density parameter-calculating means calculates
(maximum value - minimum value) of the density of pixels in
said mask, and the sum total of the difference in the density
of successive 2 pixels, with respect to the main scanning
direction and the sub scanning direction in said mask,
respectively, and designates the smaller one as the density
parameter.
Claim 6
Dependent Claim
23 words
An area judging apparatus according to claim 1,
wherein said threshold is the mean value of the density of
pixels in said mask.
Claim 7
Dependent Claim
23 words
An area judging apparatus according to claim 2,
wherein said threshold is the mean value of the density of
pixels in said mask.
Claim 8
Dependent Claim
44 words
An area judging apparatus according to claim 1,
wherein said threshold is a value which is varied so that
there is a difference between the linkage degree for each
area, with respect to the mean value of the density of pixels
in said mask.
Claim 9
Dependent Claim
44 words
An area judging apparatus according to claim 2,
wherein said threshold is a value which is varied so that
there is a difference between the linkage degree for each
area, with respect to the mean value of the density of pixels
in said mask.
Claim 10
Dependent Claim
53 words
An area judging apparatus according to claim 1,
wherein said linkage degree-calculating means counts the
number of black pixels in each line both in the main scanning
direction and in the sub scanning direction from the results
of binarization in said mask, and designates the largest
value among them as the linkage degree.
Claim 11
Dependent Claim
53 words
An area judging apparatus according to claim 2,
wherein said linkage degree-calculating means counts the
number of black pixels in each line both in the main scanning
direction and in the sub scanning direction from the results
of binarization in said mask, and designates the largest
value among them as the linkage degree.
Claim 12
Dependent Claim
54 words
An area judging apparatus according to claim 1,
wherein said linkage degree-calculating means counts the
number of successive black pixels in each line both in the
main scanning direction and in the sub scanning direction
from the results of binarization in said mask, and designates
the largest value among them as the linkage degree.
Claim 13
Dependent Claim
54 words
An area judging apparatus according to claim 2,
wherein said linkage degree-calculating means counts the
number of successive black pixels in each line both in the
main scanning direction and in the sub scanning direction
from the results of binarization in said mask, and designates
the largest value among them as the linkage degree.
Claim 14
Dependent Claim
61 words
An area judging apparatus according to claim 1,
wherein said linkage degree-calculating means counts the
number of successive black pixels in each line both in the
main scanning direction and in the sub scanning direction
from the results of binarization in said mask, adds the
results for successive plural lines, and designates the
largest value among them as the linkage degree.
Claim 15
Dependent Claim
61 words
An area judging apparatus according to claim 2,
wherein said linkage degree-calculating means counts the
number of successive black pixels in each line both in the
main scanning direction and in the sub scanning direction
from the results of binarization in said mask, adds the
results for successive plural lines, and designates the
largest value among them as the linkage degree.
Claim 16
Dependent Claim
66 words
An area judging apparatus according to claim 1,
wherein said linkage degree-calculating means counts the
number of successive black pixels in each line in the main
scanning direction, in the sub scanning direction, and in
two diagonal directions at 45° from the results of
binarization in said mask, adds the results for successive
plural lines, and designates the largest value among them
as the linkage degree.
Claim 17
Dependent Claim
66 words
An area judging apparatus according to claim 2,
wherein said linkage degree-calculating means counts the
number of successive black pixels in each line in the main
scanning direction, in the sub scanning direction, and in
two diagonal directions at 45° from the results of
binarization in said mask, adds the results for successive
plural lines, and designates the largest value among them
as the linkage degree.
Claim 18
Dependent Claim
59 words
An area judging apparatus according to claims 16
and 17, wherein when the number of the successive black pixels
in each line is counted in the main scanning direction, in
the sub scanning direction, and in two diagonal directions
at 45°, normalization is performed according to the
difference in the total pixel number to be counted in each
direction.
Claim 19
Dependent Claim
83 words
An area judging apparatus according to claim 1,
wherein said linkage degree-calculating means counts the
number of successive black pixels in each line both in the
main scanning direction and in the sub scanning direction
from the results of binarization in said mask, adds the
results for successive plural lines, and further determines
(maximum value - minimum value) of the added results in the
main scanning direction and in the sub scanning direction,
respectively, and designates the largest value as the linkage
degree.
Claim 20
Dependent Claim
83 words
An area judging apparatus according to claim 2,
wherein said linkage degree-calculating means counts the
number of successive black pixels in each line both in the
main scanning direction and in the sub scanning direction
from the results of binarization in said mask, adds the
results for successive plural lines, and further determines
(maximum value - minimum value) of the added results in the
main scanning direction and in the sub scanning direction,
respectively, and designates the largest value as the linkage
degree.
Claim 21
Dependent Claim
34 words
An area judging apparatus according to claim 1,
wherein when the number of pixels in said mask differs in
the main scanning direction and in the sub scanning direction,
said characteristic value is normalized.
Claim 22
Dependent Claim
34 words
An area judging apparatus according to claim 2,
wherein when the number of pixels in said mask differs in
the main scanning direction and in the sub scanning direction,
said characteristic value is normalized.
Claim 23
Dependent Claim
27 words
An area judging apparatus according to claim 1,
wherein when conforming to the predetermined conditions, the
judgement according to the characteristic value can be
corrected and controlled.
Claim 24
Dependent Claim
27 words
An area judging apparatus according to claim 2,
wherein when conforming to the predetermined conditions, the
judgement according to the characteristic value can be
corrected and controlled.
References Cited (Backward Citations)
No citation records indexed.
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