US5448654A
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Image reduction apparatus
Assignee: Canon Inc
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Filing: 1994-03-03
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Granted: 1995-09-05
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Expires: 2014-03-03
Abstract
Abstract An image reduction apparatus includes a smoothing unit for smoothing binary image data, a binarization unit for binarizing an output from the smoothing unit, a detection unit for detecting an attribute of the binary image data smoothed by the smoothing unit, a plurality of correction units corresponding to a plurality of attributes, and a selector for selecting one of the correction units in accordance with the attribute detected by the detection unit. An output from the binarization unit is corrected by the correction unit selected by the selector.
Inventors
- 👤 Akihiro Katayama
- 👤 Mitsuru Maeda
- 👤 Yasuji Hirabayashi
- 👤 Tadashi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:08
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/41; H04N1/411; H04N1/413; H04N1/417; H04N1/4172; H04N1/40; H04N1/40062; H04N1/40068; H04N1/409; H04N1/4105
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
163 words
An image reduction apparatus comprising: input means for inputting image data representing an image; and processing means for executing a reduction process on the image data input by input means and outputting reduced image data, wherein said processing means further comprises: reduction means for executing a reduction process on the image data; discrimination means for discriminating as to whether a pattern of an image represented by the image data corresponds to one of a plurality of predetermined patterns, the plurality of predetermined patterns comprising a plurality of black patterns representing a black image with a white background and a plurality of white patterns representing a white image with a black background; and correction means for correcting the reduction process by said reduction means when said discrimination means discriminates that the pattern of the image represented by the image data corresponds to one of the plurality of predetermined patterns, wherein a number of the black patterns is larger than that of the white patterns.
Claim 2
Dependent Claim
163 words
An image reduction apparatus comprising: input means for inputting image data representing an image; and processing means for executing a reduction process on the image data input by input means and outputting reduced image data, wherein said processing means further comprises: reduction means for executing a reduction process on the image data; discrimination means for discriminating as to whether a pattern of an image represented by the image data corresponds to one of a plurality of predetermined patterns, the plurality of predetermined patterns comprising a plurality of black patterns representing a black image with a white background and a plurality of white patterns representing a white image with a black background; and correction means for correcting the reduction process by said reduction means when said discrimination means discriminates that the pattern of the image represented by the image data corresponds to one of the plurality of predetermined patterns, wherein a number of the black patterns is larger than that of the white patterns.
Claim 3
Dependent Claim
38 words
An apparatus according to claim 1, wherein said discrimination means discriminates as to whether the pattern of an image within an image block consisting of a plurality of pixels corresponds to one of the plurality of predetermined patterns.
Claim 4
Dependent Claim
22 words
An apparatus according to claim 1, wherein said correction means is adapted to reverse reduced image data obtained by the reduction process.
Claim 5
Dependent Claim
31 words
An apparatus according to claim 1, wherein said reduction means includes smoothing means for smoothing the image data by filter-processing the image data of peripheral pixels of a pixel of interest.
Claim 6
Dependent Claim
18 words
An apparatus according to claim 4, further comprising binarization means for binarizing an output from said smoothing means.
Claim 7
Dependent Claim
18 words
An apparatus according to claim 5, further comprising sub-sampling means for sub-sampling an output from said binarization means.
Claim 8
Dependent Claim
131 words
An image reduction apparatus comprising: input means for inputting image data representing an image; and processing means for executing a reduction process on the image data input by the input means and outputting the reduced image data, wherein said processing means comprises: reduction means for executing a reduction process for image data representing a positive image; entering means for entering an attribute indicating whether an image represented by the image data is a positive image or a negative image; and conversion means for converting the image data representing a negative image into image data representing a positive image, wherein said reduction means executes the reduction process for the image data converted by said converting means when the attribute entered by said entering means indicates that the image is a negative image.
Claim 9
Dependent Claim
131 words
An image reduction apparatus comprising: input means for inputting image data representing an image; and processing means for executing a reduction process on the image data input by the input means and outputting the reduced image data, wherein said processing means comprises: reduction means for executing a reduction process for image data representing a positive image; entering means for entering an attribute indicating whether an image represented by the image data is a positive image or a negative image; and conversion means for converting the image data representing a negative image into image data representing a positive image, wherein said reduction means executes the reduction process for the image data converted by said converting means when the attribute entered by said entering means indicates that the image is a negative image.
Claim 10
Dependent Claim
34 words
An apparatus according to claim 7, wherein said processing means includes second conversion means for reversing the image data from said reduction means so as to convert a positive image into a negative image.
Claim 11
Dependent Claim
32 words
An apparatus according to claim 7, wherein said entering means includes said detection means for detecting whether the image represented by the image data is a negative image or a positive image.
Claim 12
Dependent Claim
31 words
An apparatus according to claim 7, wherein said reduction means includes smoothing means for smoothing the image data by filter-processing the image data of peripheral pixels of a pixel of interest.
Claim 13
Dependent Claim
18 words
An apparatus according to claim 10, further comprising binarization means for binarizing an output from said smoothing means.
Claim 14
Dependent Claim
18 words
An apparatus according to claim 11, further comprising sub-sampling means for sub-sampling an output from said binarization means.
Claim 15
Dependent Claim
124 words
An image reduction method comprising the steps of: executing a reduction process for image data representing an image; providing a plurality of predetermined patterns, the plurality of predetermined patterns comprising a plurality of black patterns representing a black image with a white background and a plurality of white patterns representing a white image with a black background; discriminating as to whether a pattern of an image represented by the image data corresponds to one of a plurality of predetermined patterns; and correcting the reduction process when said discrimination step discriminates that the pattern of the image represented by the image data corresponds to one of the plurality of predetermined patterns, wherein the number of black patterns is larger than that of the white patterns.
Claim 16
Dependent Claim
124 words
An image reduction method comprising the steps of: executing a reduction process for image data representing an image; providing a plurality of predetermined patterns, the plurality of predetermined patterns comprising a plurality of black patterns representing a black image with a white background and a plurality of white patterns representing a white image with a black background; discriminating as to whether a pattern of an image represented by the image data corresponds to one of a plurality of predetermined patterns; and correcting the reduction process when said discrimination step discriminates that the pattern of the image represented by the image data corresponds to one of the plurality of predetermined patterns, wherein the number of black patterns is larger than that of the white patterns.
Claim 17
Dependent Claim
38 words
An apparatus according to claim 13, wherein said discrimination step discriminates as to whether the pattern of an image within an image block consisting of a plurality of pixels corresponds to one of the plurality of predetermined patterns.
Claim 18
Dependent Claim
22 words
A method according to claim 13, wherein said correction step is adapted to reverse reduced image data obtained by the reduction process.
Claim 19
Dependent Claim
32 words
A method according to claim 13, wherein said executing step includes a smoothing step for smoothing the image data by filter-processing the image data of peripheral pixels of a pixel of interest.
Claim 20
Dependent Claim
20 words
A method according to claim 16, further comprising a binarization step for binarizing an output obtained by said smoothing step.
Claim 21
Dependent Claim
20 words
A method according to claim 17, further comprising a sub-sampling step for sub-sampling an output obtained by said binarization step.
Claim 22
Dependent Claim
85 words
An image reduction method comprising the steps of: executing a reduction process on image data representing a positive image; inputting an attribute indicating whether an image represented by the image data is a positive image or a negative image; and converting the image data representing a negative image into image data representing a positive image, wherein said reduction executing step executes the reduction process for the image data converted by said converting step when the input attribute indicates that the image is a negative image.
Claim 23
Dependent Claim
85 words
An image reduction method comprising the steps of: executing a reduction process on image data representing a positive image; inputting an attribute indicating whether an image represented by the image data is a positive image or a negative image; and converting the image data representing a negative image into image data representing a positive image, wherein said reduction executing step executes the reduction process for the image data converted by said converting step when the input attribute indicates that the image is a negative image.
Claim 24
Dependent Claim
29 words
A method according to claim 19, further comprising a second conversion step for reversing the reduced image data so as to convert a positive image into a negative image.
Claim 25
Dependent Claim
32 words
A method according to claim 19, wherein said input step includes a detection step for detecting whether the image represented by the image data is a negative image or a positive image.
Claim 26
Dependent Claim
32 words
A method according to claim 19, wherein said reduction step includes a smoothing step for smoothing the image data by filter-processing the image data of peripheral pixels of a pixel of interest.
Claim 27
Dependent Claim
20 words
A method according to claim 22, further comprising a binarization step for binarizing an output obtained by said smoothing step.
Claim 28
Dependent Claim
24 words
A method according to claim 19, wherein said discrimination step discriminates as to whether the image disappears as a result of the reduction process.
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| 3.5 Years (Year 4) | 1998-09-04 | 1999-03-06 | 1999-09-05 | $2000.00 | Window Closed / Lapsed |
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