US5771313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for and method of detecting dotted image area using two types of judging areas
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1995-11-02
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Granted: 1998-06-23
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Expires: 2015-11-02
Abstract
Abstract An apparatus for and a method of detecting a dotted image area in an image. It is judged on the basis of image data corresponding to pixels in a first judging area which includes a predetermined number of pixels including a target pixel whether or not the target pixel is a peculiar point pixel (a peak pixel or a dip pixel). Further, it is judged on the basis of image data corresponding to pixels in a second judging area which is larger than the first judging area whether or not the target pixel is a peculiar point pixel. The dotted image area in the image is detected on the basis of the results of judgment related to the first judging area and the second judging area.
Inventors
- 👤 Shinji Hayashi
- 👤 Masaya Fujimoto
- 👤 Hidechika Kumamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:02
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40062
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
289 words
A dotted image area detecting apparatus for successively processing pixels constituting an image as a target pixel on the basis of image data representing densities of the pixels to detect a dotted image area in the image, the apparatus comprising: first judging means including means for setting a first judging area which has a predetermined number of pixels including a target pixel, and means for judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the first judging area; second judging means including means for setting a second judging area which has a predetermined number of pixels including a target pixel and is larder than the first judging area, and means for judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the second judging area; and dotted image area detecting means for detecting a dotted image area in the image on the basis of a result of judgment by the first judging means and a result of judgment by the second judging means, wherein the dotted image area detecting means includes coarseness detecting means for detecting a coarseness of a dotted image area, selecting means, to which the result of judgment by the first judging means and the result of judgment by the second judging means are given, for selecting either one of the two results of judgment and outputting the selected result of judgment depending on the coarseness of the dotted image area detected by the coarseness detecting means, and means for detecting a dotted image area in the image on the basis of the result of judgment selected by the selecting means.
Claim 2
Dependent Claim
289 words
A dotted image area detecting apparatus for successively processing pixels constituting an image as a target pixel on the basis of image data representing densities of the pixels to detect a dotted image area in the image, the apparatus comprising: first judging means including means for setting a first judging area which has a predetermined number of pixels including a target pixel, and means for judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the first judging area; second judging means including means for setting a second judging area which has a predetermined number of pixels including a target pixel and is larder than the first judging area, and means for judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the second judging area; and dotted image area detecting means for detecting a dotted image area in the image on the basis of a result of judgment by the first judging means and a result of judgment by the second judging means, wherein the dotted image area detecting means includes coarseness detecting means for detecting a coarseness of a dotted image area, selecting means, to which the result of judgment by the first judging means and the result of judgment by the second judging means are given, for selecting either one of the two results of judgment and outputting the selected result of judgment depending on the coarseness of the dotted image area detected by the coarseness detecting means, and means for detecting a dotted image area in the image on the basis of the result of judgment selected by the selecting means.
Claim 3
Dependent Claim
91 words
A dotted image area detecting apparatus according to claim 1, wherein the coarseness detecting means includes attribute detecting means for giving an attribute to each of the pixels depending on whether or not a density of the target pixel is higher than an average value of densities of the pixels in predetermined positions around the target pixel, and dot pitch judging means for judging whether or not a pitch between dots is large on the basis of a pitch between change points of the attribute given by the attribute detecting means.
Claim 4
Dependent Claim
40 words
A dotted image area detecting apparatus according to claim 2, further comprising means for judging that an area where the pitch between the change points of the attribute has no predetermined periodicity does not belong to a dotted image area.
Claim 5
Dependent Claim
49 words
A dotted image area detecting apparatus according to claim 1, further comprising storing means for storing image data in units of a predetermined number of lines, and wherein the second judging area extends the first judging area in the direction of a line without changing the number of lines.
Claim 6
Dependent Claim
49 words
A dotted image area detecting apparatus according to claim 1, further comprising storing means for storing image data in units of a predetermined number of lines, and wherein the second judging area extends the first judging area in the direction of a line without changing the number of lines.
Claim 7
Dependent Claim
281 words
A dotted image area detecting apparatus for successively processing pixels constituting an image as a target pixel on the basis of image data representing densities of the pixels to detect a dotted image area in the image, the apparatus comprising: first judging means including means for setting a first judging area which has a predetermined number of pixels including a target pixel, and means for judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the first judging area; second judging means including means for setting a second judging area which has a predetermined number of pixels including a target pixel and is larger than the first judging area, and means for judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the second judging area; and dotted image area detecting means for detecting a dotted image area in the image on the basis of a result of judgment by the first judging means and a result of judgment by the second judging means, wherein the dotted image area detecting means includes first detecting means for detecting a dotted image area on the basis of the result of judgment by the first judging means, second detecting means for detecting a dotted image area on the basis of the result of judgment by the second judging means, and judging means for judging whether or not a predetermined detecting area belongs to a dotted image area on the basis of a result of detection by the first detecting means and a result of detection by the second detecting means.
Claim 8
Dependent Claim
281 words
A dotted image area detecting apparatus for successively processing pixels constituting an image as a target pixel on the basis of image data representing densities of the pixels to detect a dotted image area in the image, the apparatus comprising: first judging means including means for setting a first judging area which has a predetermined number of pixels including a target pixel, and means for judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the first judging area; second judging means including means for setting a second judging area which has a predetermined number of pixels including a target pixel and is larger than the first judging area, and means for judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the second judging area; and dotted image area detecting means for detecting a dotted image area in the image on the basis of a result of judgment by the first judging means and a result of judgment by the second judging means, wherein the dotted image area detecting means includes first detecting means for detecting a dotted image area on the basis of the result of judgment by the first judging means, second detecting means for detecting a dotted image area on the basis of the result of judgment by the second judging means, and judging means for judging whether or not a predetermined detecting area belongs to a dotted image area on the basis of a result of detection by the first detecting means and a result of detection by the second detecting means.
Claim 9
Dependent Claim
275 words
A dotted image area detecting method for successively processing pixels constituting an image as a target pixel on the basis of image data representing each of densities of the pixels to detect a dotted image area in the image, the method comprising the steps of: setting a first Judging area which includes a predetermined number of pixels including a target pixel; judging whether the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the first judging area; setting a second judging area which includes a predetermined number of pixels including a target pixel and is larger than the first judging area; judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the second judging area; and detecting a dotted image area in the image on the basis of a result of judgment based on the image data corresponding to the pixels in the first judging area and a result of judgment based on the image data corresponding to the pixels in the second judging area, wherein the step of detecting a dotted image area includes the steps of detecting a coarseness of a dotted image area, selecting either one of the result of judgment based on the image data corresponding to the pixels in the first judging area and the result of judgment based on the image data corresponding to the pixels in the second judging area depending on the detected coarseness of a dotted image area, and detecting a dotted image area in the image on the basis of the selected result of judgment.
Claim 10
Dependent Claim
275 words
A dotted image area detecting method for successively processing pixels constituting an image as a target pixel on the basis of image data representing each of densities of the pixels to detect a dotted image area in the image, the method comprising the steps of: setting a first Judging area which includes a predetermined number of pixels including a target pixel; judging whether the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the first judging area; setting a second judging area which includes a predetermined number of pixels including a target pixel and is larger than the first judging area; judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the second judging area; and detecting a dotted image area in the image on the basis of a result of judgment based on the image data corresponding to the pixels in the first judging area and a result of judgment based on the image data corresponding to the pixels in the second judging area, wherein the step of detecting a dotted image area includes the steps of detecting a coarseness of a dotted image area, selecting either one of the result of judgment based on the image data corresponding to the pixels in the first judging area and the result of judgment based on the image data corresponding to the pixels in the second judging area depending on the detected coarseness of a dotted image area, and detecting a dotted image area in the image on the basis of the selected result of judgment.
Claim 11
Dependent Claim
82 words
A method according to claim 7, wherein the step of detecting a coarseness of a dotted image area includes the steps of giving an attribute to each of the pixels depending on whether or not a density of the target pixel is higher than an average value of densities of pixels in predetermined positions around the target pixel, and judging whether or not a pitch between dots is large on the basis of a pitch between change points of the given attribute.
Claim 12
Dependent Claim
37 words
A method according to claim 8, further comprising the step of judging that an area where the pitch between the change points of the attribute has no predetermined periodicity does not belong to a dotted image area.
Claim 13
Dependent Claim
31 words
A method according to claim 7, wherein the second judging area is obtained by extending the first judging area in the direction of a line without changing the number of lines.
Claim 14
Dependent Claim
300 words
A dotted image area detecting method for successively processing pixels constituting an image as a target pixel on the basis of image data representing each of densities of the pixels to detect a dotted image area in the image, the method comprising the steps of: setting a first Judging area which includes a predetermined number of pixels including a target pixel; judging whether the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the first judging area; setting a second Judging area which includes a predetermined number of pixels including a target pixel and is larger than the first judging area; judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the second judging area; and detecting a dotted image area in the image on the basis of a result of judgment based on the image data corresponding to the pixels in the first judging area and a result of judgment based on the image data corresponding to the pixels in the second judging area, wherein the step of detecting a dotted image area includes a first detecting step for detecting a dotted image area on the basis of the result of judgment based on the image data corresponding to the pixels in the first judging area, a second detecting step of detecting a dotted image area on the basis of the result of judgment based on the image data corresponding to the pixels in the second judging area, and a step of judging whether or not a predetermined detecting area belongs to a dotted image area on the basis of a result of detection in the first detecting step and a result of detection in the second detecting step.
Claim 15
Dependent Claim
300 words
A dotted image area detecting method for successively processing pixels constituting an image as a target pixel on the basis of image data representing each of densities of the pixels to detect a dotted image area in the image, the method comprising the steps of: setting a first Judging area which includes a predetermined number of pixels including a target pixel; judging whether the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the first judging area; setting a second Judging area which includes a predetermined number of pixels including a target pixel and is larger than the first judging area; judging whether or not the target pixel is a peculiar point pixel on the basis of image data corresponding to pixels in the second judging area; and detecting a dotted image area in the image on the basis of a result of judgment based on the image data corresponding to the pixels in the first judging area and a result of judgment based on the image data corresponding to the pixels in the second judging area, wherein the step of detecting a dotted image area includes a first detecting step for detecting a dotted image area on the basis of the result of judgment based on the image data corresponding to the pixels in the first judging area, a second detecting step of detecting a dotted image area on the basis of the result of judgment based on the image data corresponding to the pixels in the second judging area, and a step of judging whether or not a predetermined detecting area belongs to a dotted image area on the basis of a result of detection in the first detecting step and a result of detection in the second detecting step.
Claim 16
Dependent Claim
31 words
A method according to claim 11, wherein the second judging area is obtained by extending the first judging area in the direction of a line without changing the number of lines.
References Cited (Backward Citations)
US4403257A
Cited
EP0236594A1
Cited
EP0291000A2
Cited
US5025481A
Cited
US5617485A
Cited
US5193122A
Cited
US5341227A
Cited
US5587808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-22 | 2001-12-22 | 2002-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-22 | 2005-12-22 | 2006-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-22 | 2009-12-22 | 2010-06-23 | $7700.00 | Window Closed / Lapsed |