US5408339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image area discriminating device
Assignee: Ricoh Co Ltd
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Filing: 1994-03-14
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Granted: 1995-04-18
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Expires: 2014-03-14
Abstract
Abstract An image area dicriminating device for a digital copier, facsimile machine, scanner or similar imaging equipment. The device determines whether areas constituting an input image each has undergone dot processing or not automatically.
Inventors
- 👤 Tomio Sasaki
- 👤 Shinji Kobayashi
- 👤 Masahito Obata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:22
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40075; H04N1/40062
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A device for discriminating an image area, comprising: a) density difference detecting means for determining whether or not a difference between: (1) density data of a pixel of interest included in input image data and (2) density data of pixels surrounding said pixel of interest, is greater than a predetermined large value; and b) record dot and non-record dot detecting means including: A) means for comparing, by referencing an output signal of said density difference detecting means: (1) a bi-dimensional pattern of said input image data with (2) a record dot and non-record dot detection pattern; and B) means for producing a result of the comparison.
Claim 2
Independent Claim
106 words
A device for discriminating an image area, comprising: a) density difference detecting means for determining whether or not a difference between: (1) density data of a pixel of interest included in input image data and (2) density data of pixels surrounding said pixel of interest, is greater than a predetermined large value; and b) record dot and non-record dot detecting means including: A) means for comparing, by referencing an output signal of said density difference detecting means: (1) a bi-dimensional pattern of said input image data with (2) a record dot and non-record dot detection pattern; and B) means for producing a result of the comparison.
Claim 3
Independent Claim
145 words
A device for discriminating an image area, comprising: a) density detecting means for determining that, among pixels associated with a pixel of interest of input image data: (1) a pixel having a high density or (2) a pixel having a low density, is to be the pixel of interest; b) density difference detecting means for determining whether or not a difference between: (1) density data output by said density detecting means and (2) density data of pixels which surround said pixel of data, is greater than a predetermined large value; and c) record dot and non-record dot detecting means including: A) means for comparing, by referencing an output signal of said density difference detecting means: (1) a bi-dimensional pattern of said input image data with (2) a predetermined record dot and non-record dot detection pattern; and B) means for outputting a result of the comparison.
Claim 4
Independent Claim
145 words
A device for discriminating an image area, comprising: a) density detecting means for determining that, among pixels associated with a pixel of interest of input image data: (1) a pixel having a high density or (2) a pixel having a low density, is to be the pixel of interest; b) density difference detecting means for determining whether or not a difference between: (1) density data output by said density detecting means and (2) density data of pixels which surround said pixel of data, is greater than a predetermined large value; and c) record dot and non-record dot detecting means including: A) means for comparing, by referencing an output signal of said density difference detecting means: (1) a bi-dimensional pattern of said input image data with (2) a predetermined record dot and non-record dot detection pattern; and B) means for outputting a result of the comparison.
Claim 5
Independent Claim
120 words
A device for discriminating an image area, comprising: a) density difference detecting means for determining whether or not a difference between: (1) density data of a pixel of interest included in input image data and (2) density data of pixels surrounding said pixel of interest, is greater than a plurality of predetermined large values; and b) a plurality of record dot and non-record dot detecting means including: A) means for comparing, by referencing an output signal of said density difference detecting means: (1) a bi-dimensional pattern of said input image data with (2) a plurality of record dot and non-record dot detection patterns; wherein each of the patterns is associated with a respective one of said plurality of predetermined values.
Claim 6
Independent Claim
120 words
A device for discriminating an image area, comprising: a) density difference detecting means for determining whether or not a difference between: (1) density data of a pixel of interest included in input image data and (2) density data of pixels surrounding said pixel of interest, is greater than a plurality of predetermined large values; and b) a plurality of record dot and non-record dot detecting means including: A) means for comparing, by referencing an output signal of said density difference detecting means: (1) a bi-dimensional pattern of said input image data with (2) a plurality of record dot and non-record dot detection patterns; wherein each of the patterns is associated with a respective one of said plurality of predetermined values.
Claim 7
Independent Claim
136 words
A device for discriminating an image area, comprising: a) averaging means for averaging input image density data in a first bi-dimensional arrangement; b) selecting means for selecting a plurality of predetermined large values in response to an output of said averaging means; c) density difference detecting means for determining whether or not a difference between: (1) density data of a pixel of interest included in input image data and (2) density data of pixels surrounding said pixel of interest, is greater than said predetermined large values selected by said selecting means; and d) record dot and non-record dot detecting means including: A) means for comparing: (1) an output signal of said density difference detecting means with (2) a predetermined record dot and non-record dot detection pattern; and B) means for outputting a result of the comparison.
Claim 8
Independent Claim
136 words
A device for discriminating an image area, comprising: a) averaging means for averaging input image density data in a first bi-dimensional arrangement; b) selecting means for selecting a plurality of predetermined large values in response to an output of said averaging means; c) density difference detecting means for determining whether or not a difference between: (1) density data of a pixel of interest included in input image data and (2) density data of pixels surrounding said pixel of interest, is greater than said predetermined large values selected by said selecting means; and d) record dot and non-record dot detecting means including: A) means for comparing: (1) an output signal of said density difference detecting means with (2) a predetermined record dot and non-record dot detection pattern; and B) means for outputting a result of the comparison.
References Cited (Backward Citations)
US4266249A
Cited
US4547811A
Cited
US4495522A
Cited
US4570186A
Cited
US4403257A
Cited
JPS58173975A
Cited
EP0126782A1
Cited
US4729035A
Cited
DE3433493A1
Cited
US4701808A
Cited
JPS60128777A
Cited
US5018024A
Cited
EP0158155A2
Cited
US4607828A
Cited
US4577235A
Cited
US4686579A
Cited
US4901363A
Cited
US4742399A
Cited
US4703513A
Cited
US4827433A
Cited
GB2195859A
Cited
EP0291000A2
Cited
US4984283A
Cited
EP0305246A1
Cited
EP0349234A2
Cited
US4828234A
Cited
EP0362595A2
Cited
US5102105A
Cited
US5145156A
Cited
US5170998A
Cited
US5242158A
Cited
US5180148A
Cited
US5314173A
Cited
US5217211A
Cited
US5150428A
Cited
US5246212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-17 | 1998-10-17 | 1999-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-17 | 2002-10-17 | 2003-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-17 | 2006-10-17 | 2007-04-18 | $7700.00 | Window Closed / Lapsed |