Patent US4782399A successfully refreshed from Google Patents.
US4782399A
Expired / Lapsed
US
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Image processing apparatus with high- and low-resolution image sensors and an edge detector
Assignee: Canon Inc
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Filing: 1985-06-18
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Granted: 1988-11-01
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Expires: 2005-06-18
Abstract
Abstract An image processing apparatus has image input systems for inputting image data at high and low resolutions, a high pass filter for filtering the low-resolution image data, an image property discrimination processor for discriminating an edge in the high-pass filtered low-resolution image data, and a signal selection circuit for selecting the image of high or low resolution in accordance with the discrimination result of the discrimination processor. The apparatus processes image signals so as to reproduce optimum quality images for all types of original images including character and halftone images.
Inventors
- 👤 Hiroaki Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:42
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/409; H04N1/4092; G; G06; G06T; G06T3/00; G06T3/40; G06T3/403; H04N1/40062
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
70 words
An image processing apparatus comprising: first input means for inputting image data of high resolution; second input means for inputting image data of low resolution; discriminating means for discriminating an image content of the image data inputted by said second input means; and selecting means for selecting the image data inputted by one of said first and second input means in accordance with a discrimination result of said discriminating means.
Claim 2
Dependent Claim
70 words
An image processing apparatus comprising: first input means for inputting image data of high resolution; second input means for inputting image data of low resolution; discriminating means for discriminating an image content of the image data inputted by said second input means; and selecting means for selecting the image data inputted by one of said first and second input means in accordance with a discrimination result of said discriminating means.
Claim 3
Dependent Claim
30 words
An apparatus according to claim 1, wherein said discriminating means discriminates the image content on the basis of an edge in the image data inputted by said second input means.
Claim 4
Dependent Claim
36 words
An apparatus according to claim 1, further comprising means for delaying the image data inputted by said first and second input means for a time period required for said discriminating means to perform a discrimination operation.
Claim 5
Dependent Claim
38 words
An apparatus according to claim 1, wherein said first and second input means comprise a line sensor for reading an image at a high resolution and a line sensor for reading an image at a low resolution, respectively.
Claim 6
Dependent Claim
33 words
An apparatus according to claim 1, wherein said discriminating means discriminates the image content by performing a discrimination operation on each of a plurality of blocks of image data of a predetermined size.
Claim 7
Dependent Claim
29 words
An apparatus according to claim 1, wherein said first and second input means simultaneously input said image data of high resolution and said image data of low resolution, respectively.
Claim 8
Dependent Claim
26 words
An apparatus according to claim 1, wherein said image data of high resolution and said image data of low resolution are representative of the same image.
Claim 9
Dependent Claim
98 words
An image processing apparatus comprising: first input means for inputting image data of low resolution; second input means for inputting image data of high resolution; means for detecting an edge candidate point in the image data of low resolution inputted by said first input means; means for discriminating an image content of the image data of low resolution in accordance with a detection result of said detecting means; and selecting means for selecting one of the image data of low resolution and the image data of high resolution in accordance with a discrimination result of said discriminating means.
Claim 10
Dependent Claim
98 words
An image processing apparatus comprising: first input means for inputting image data of low resolution; second input means for inputting image data of high resolution; means for detecting an edge candidate point in the image data of low resolution inputted by said first input means; means for discriminating an image content of the image data of low resolution in accordance with a detection result of said detecting means; and selecting means for selecting one of the image data of low resolution and the image data of high resolution in accordance with a discrimination result of said discriminating means.
Claim 11
Dependent Claim
33 words
An apparatus according to claim 7, wherein said discriminating means discriminates the image content by performing a discrimination operation on each of a plurality of blocks of image data of a predetermined size.
Claim 12
Dependent Claim
38 words
An apparatus according to claim 7, wherein said first and second input means comprise a line sensor for reading an image at a low resolution and a line sensor for reading an image at a high resolution, respectively.
Claim 13
Dependent Claim
26 words
An apparatus according to claim 8, wherein said image data of high resolution and said image data of low resolution are representative of the same image.
Claim 14
Dependent Claim
34 words
An apparatus according to claim 8, wherein said discriminating means comprises means for counting a number of edge candidate points, and discriminates the image content in accordance with the count of said counting means.
Claim 15
Dependent Claim
95 words
An image processing apparatus comprising: input means for inputting image data of low resolution; means for detecting an edge candidate point in the image data inputted by said input means; means for discriminating an image content of the image data in accordance with a detection result of said detecting means; and processing means for performing different processing in accordance with a discrimination result of said discriminating means; wherein said discriminating means comprises means for counting a number of edge candidate points, and discriminates the image content in accordance with the count of said counting means.
Claim 16
Dependent Claim
95 words
An image processing apparatus comprising: input means for inputting image data of low resolution; means for detecting an edge candidate point in the image data inputted by said input means; means for discriminating an image content of the image data in accordance with a detection result of said detecting means; and processing means for performing different processing in accordance with a discrimination result of said discriminating means; wherein said discriminating means comprises means for counting a number of edge candidate points, and discriminates the image content in accordance with the count of said counting means.
References Cited (Backward Citations)
US4004079A
Cited
US4194221A
Cited
US4288821A
Cited
US4554593A
Cited
US4403257A
Cited
JPS58191571A
Cited
US4577235A
Cited
USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |