US4860118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image signal processing apparatus with edge emphasis and variable magnification
Assignee: Canon Inc
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Filing: 1988-02-22
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Granted: 1989-08-22
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Expires: 2008-02-22
Abstract
Abstract An image signal processing apparatus may include a line sensor for photoelectrically reading an original image and outputting an image signal, a rotary encoder for setting reproduction magnifications of the original image, an edge emphasis circuit for performing edge emphasis processing for the image signal output from the line sensor, and W- and R-address counters and first and second clock cotnrol signals, all of which cooperate to control a degree of edge emphasis performed by the edge emphasis circuit in accordance with the reproduction magnification set by the rotary encoder. The magnification can preferably be set independently for the main scanning and the sub-scanning directions. A correction signal is used in the edge emphasis processing, and is preferably formed on the basis of image signals of pixels near the particular pixel of interest. The image signal may also be smoothed after edge emphasis.
Inventors
- 👤 Shinobu Arimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:57
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/409; H04N1/4092; G; G06; G06T; G06T3/00; G06T3/40; G06T3/403; H04N1/387; H04N1/393; H04N1/3935
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
124 words
An image signal processing apparatus comprising: reading means for photoelectrically reading an original image and outputting an image signal; means for setting a reproduction magnification of the original image; means for forming a correction signal, for use in an edge emphasis processing of an image signal of a particular pixel of the original image from image signals of a plurality of pixels of the original image near the particular pixel; processing means for performing the edge emphasis processing of the image signal of the particular pixel in accordance with the correction signal formed by said forming means; and control means for varying the level of the correction signal formed by said forming means in accordance with the reproduction magnification set by said setting means.
Claim 2
Dependent Claim
124 words
An image signal processing apparatus comprising: reading means for photoelectrically reading an original image and outputting an image signal; means for setting a reproduction magnification of the original image; means for forming a correction signal, for use in an edge emphasis processing of an image signal of a particular pixel of the original image from image signals of a plurality of pixels of the original image near the particular pixel; processing means for performing the edge emphasis processing of the image signal of the particular pixel in accordance with the correction signal formed by said forming means; and control means for varying the level of the correction signal formed by said forming means in accordance with the reproduction magnification set by said setting means.
Claim 3
Dependent Claim
36 words
An apparatus according to claim 1, further comprising converting means for performing variable magnification processing of the edge-emphasized image signal from said processing means on the basis of the reproduction magnification set by said setting means.
Claim 4
Dependent Claim
29 words
An apparatus according to claim 2, further comprising means for recording an image based on the image signal subjected to the variable magnification processing performed by said converting means.
Claim 5
Dependent Claim
51 words
An apparatus according to claim 1, wherein said reading means reads the original image by scanning the original image in a main scanning direction and in a sub-scanning direction perpendicular to said main scanning direction, and said processing means performs different edge emphasis processings in the main scanning and sub-scanning directions.
Claim 6
Dependent Claim
30 words
An apparatus according to claim 1, wherein said control means has means for outputting a coefficient for varying the level of the correction signal in accordance with the reproduction magnification.
Claim 7
Dependent Claim
34 words
An apparatus according to claim 1, wherein said control means has multiplier means for increasing or decreasing the level of the correction signal formed by said forming means in accordance with the reproduction magnification.
Claim 8
Dependent Claim
26 words
An apparatus according to claim 1, wherein said reading means has a line sensor comprising a plurality of light receiving elements arranged in a line configuration.
Claim 9
Dependent Claim
162 words
An image signal processing apparatus comprising: reading means for photoelectrically reading an original image in a main scanning direction and in a sub-scanning direction perpendicular to said main scanning direction and outputting an image signal; means for setting reproduction magnification of the original image in the main scanning direction and the sub-scanning direction, respectively; means for forming correction signals for use in an edge emphasis processing related to the main scanning and the sub-scanning directions, respectively, from the image signals of a plurality of pixels of the original image near a particular pixel of the original image; processing means for performing the edge emphasis processing on an image signal of the particular pixel in accordance with the correction signals formed by said forming means; and control means for varying the levels of the correction signals formed by said forming means in accordance with the main scanning and sub-scanning reproduction magnifications set by said setting means in the main scanning and sub-scanning directions.
Claim 10
Dependent Claim
162 words
An image signal processing apparatus comprising: reading means for photoelectrically reading an original image in a main scanning direction and in a sub-scanning direction perpendicular to said main scanning direction and outputting an image signal; means for setting reproduction magnification of the original image in the main scanning direction and the sub-scanning direction, respectively; means for forming correction signals for use in an edge emphasis processing related to the main scanning and the sub-scanning directions, respectively, from the image signals of a plurality of pixels of the original image near a particular pixel of the original image; processing means for performing the edge emphasis processing on an image signal of the particular pixel in accordance with the correction signals formed by said forming means; and control means for varying the levels of the correction signals formed by said forming means in accordance with the main scanning and sub-scanning reproduction magnifications set by said setting means in the main scanning and sub-scanning directions.
Claim 11
Dependent Claim
40 words
An apparatus according to claim 8, further comprising converting means for performing main scanning variable magnification processing of the edge-emphasized image signal from said processing means on the basis of the main scanning reproduction magnification set by said setting means.
Claim 12
Dependent Claim
29 words
An apparatus according to claim 9, further comprising means for recording an image based on the image signal subjected to the variable magnification processing performed by said converting means.
Claim 13
Dependent Claim
36 words
An apparatus according to claim 8, wherein said reading means changes a rate at which it reads the original image in the sub-scanning direction in accordance with the sub-scanning reproduction magnification set by said setting means.
Claim 14
Dependent Claim
38 words
An apparatus according to claim 8, wherein said control means has means for outputting respective coefficients as to the main scanning and sub-scanning directions for varying the levels of the correction signals in accordance with the reproduction magnifications.
Claim 15
Dependent Claim
34 words
An apparatus according to claim 8, wherein said control means has multiplier means for increasing or decreasing the levels of the correction signals formed by said forming means in accordance with the reproduction magnifications.
Claim 16
Dependent Claim
25 words
An apparatus according to claim 8, wherein said reading means has a line sensor comprising a plurality of light-receiving elements arranged in a line configuration.
Claim 17
Dependent Claim
67 words
An image signal processing apparatus comprising: reading means for photoelectrically reading an original image and outputting an image signal; setting means for setting a reproduction magnification of the original image; processing means for performing smoothing processing of the image signal from said reading means; and control means for controlling the smoothing processing of said processing means in accordance with the reproduction magnification set by said setting means.
Claim 18
Dependent Claim
67 words
An image signal processing apparatus comprising: reading means for photoelectrically reading an original image and outputting an image signal; setting means for setting a reproduction magnification of the original image; processing means for performing smoothing processing of the image signal from said reading means; and control means for controlling the smoothing processing of said processing means in accordance with the reproduction magnification set by said setting means.
Claim 19
Dependent Claim
36 words
An apparatus according to claim 15, further comprising converting means for performing variable magnification processing of the smoothed image signal from said processing means on the basis of the reproduction magnification set by said setting means.
Claim 20
Dependent Claim
29 words
An apparatus according to claim 16, further comprising means for recording an image based on the image signal subjected to the variable magnification processing performed by said converting means.
Claim 21
Dependent Claim
18 words
An apparatus according to claim 15, wherein said processing means can perform a plurality of different smoothing operations.
Claim 22
Dependent Claim
32 words
An apparatus according to claim 15, wherein said control means determines whether the smoothing processing performed by said processing means is to be carried out or not in accordance with reproduction magnification.
Claim 23
Dependent Claim
25 words
An apparatus according to claim 15, wherein said reading means has a line sensor comprising a plurality of light-receiving elements arranged in a line configuration.
Claim 24
Dependent Claim
95 words
An image signal processing apparatus comprising: reading means for photoelectrically reading an original image and outputting an image signal; setting means for setting a reproduction magnification of the original image; first processing means for performing smoothing processing of the image signal from said reading means; second processing means for performing edge emphasis processing of the image signal from said reading means; and control means for controlling the smoothing processing by said first processing means and the edge emphasis processing by said second processing means in accordance with the reproduction magnification set by said setting means.
Claim 25
Dependent Claim
95 words
An image signal processing apparatus comprising: reading means for photoelectrically reading an original image and outputting an image signal; setting means for setting a reproduction magnification of the original image; first processing means for performing smoothing processing of the image signal from said reading means; second processing means for performing edge emphasis processing of the image signal from said reading means; and control means for controlling the smoothing processing by said first processing means and the edge emphasis processing by said second processing means in accordance with the reproduction magnification set by said setting means.
Claim 26
Dependent Claim
25 words
An apparatus according to claim 21, wherein said second processing means performs edge emphasis processing of the image signal smoothed by said first processing means.
Claim 27
Dependent Claim
46 words
An apparatus according to claim 21, further comprising third processing means for performing variable magnification processing of the image signal subjected to smoothing processing and edge emphasis processing by said first and second processing means in accordance with the reproduction magnification set by said setting means.
Claim 28
Dependent Claim
30 words
An apparatus according to claim 23, further comprising means for recording an image based on the image signal subjected to the variable magnification processing performed by said third processing means.
Claim 29
Dependent Claim
26 words
An apparatus according to claim 21, wherein said control means changes the smoothing processing performed by said first processing means in accordance with the reproduction magnification.
Claim 30
Dependent Claim
29 words
An apparatus according to claim 21, wherein said control means varies a degree of edge emphasis processing performed by said second processing means in accordance with the reproduction magnification.
Claim 31
Dependent Claim
26 words
An apparatus according to claim 21, wherein said reading means has a line sensor comprising a plurality of light receiving elements arranged in a line configuration.
Claim 32
Dependent Claim
115 words
An image signal processing apparatus comprising: reading means for photoelectrically reading an original image and outputting an image signal; means for setting a reproduction magnification of the original image; means for forming a processing signal, for use in processing an image signal of a particular pixel, of the original image, from image signals of a plurality of pixels of the original image near the particular pixel; processing means for processing the image signal of the particular pixel in accordance with the processing signal formed by said forming means; and control means for varying the level of the processing signal formed by said forming means in accordance with the reproduction magnification set by said setting means.
Claim 33
Dependent Claim
115 words
An image signal processing apparatus comprising: reading means for photoelectrically reading an original image and outputting an image signal; means for setting a reproduction magnification of the original image; means for forming a processing signal, for use in processing an image signal of a particular pixel, of the original image, from image signals of a plurality of pixels of the original image near the particular pixel; processing means for processing the image signal of the particular pixel in accordance with the processing signal formed by said forming means; and control means for varying the level of the processing signal formed by said forming means in accordance with the reproduction magnification set by said setting means.
Claim 34
Dependent Claim
35 words
An apparatus according to claim 28, further comprising converting means for performing variable magnification processing of the image signal from said processing means on the basis of the reproduction magnification set by said setting means.
Claim 35
Dependent Claim
29 words
An apparatus according to claim 29, further comprising means for recording an image based on the image signal subjected to the variable magnification processing performed by said converting means.
Claim 36
Dependent Claim
28 words
An apparatus according to claim 28, wherein said processing means performs edge emphasis processing on the image signal of the particular pixel in accordance with the processing signal.
Claim 37
Dependent Claim
30 words
An apparatus according to claim 28, wherein said control means has means for outputting a coefficient for varying the level of the processing signal in accordance with the reproduction magnification.
Claim 38
Dependent Claim
29 words
An apparatus according to claim 28, wherein said control means has multiplier means for increasing or decreasing the level of the processing signal in accordance with the reproduction magnification.
Claim 39
Dependent Claim
26 words
An apparatus according to claim 28, wherein said reading means has a line sensor comprising a plurality of light receiving elements arranged in a line configuration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |