US5333064A
Expired / Lapsed
US
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Apparatus & method for descreening
Assignee: Kodak IL Ltd
•
Filing: 1991-08-27
•
Granted: 1994-07-26
•
Expires: 2011-08-27
Abstract
Abstract Apparatus and method for descreening and for performing resolution changes on a half-tone image in order to produce a continuous tone image. The apparatus includes filter apparatus for removing screen information from the half-tone image including a plurality of different filters each providing interpolation and screen removal functions and a controller for selecting per pixel of the continuous tone image and as a function of desired resolution changes, one of the filters for operation on a neighborhood of the pixel.
Inventors
- 👤 Daniel Seidner
- 👤 Dan Eylon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:56
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/40; G06T3/4007; H; H04; H04N; H04N1/00; H04N1/40; H04N1/40075; H04N1/46; H04N1/56; H04N1/58
Claims Analysis
Total Claims: 70
Claim 1
Independent Claim
76 words
Apparatus for descreening and for performing resolution changes on a half-tone image in order to produce a continuous tone image comprising: filter means for removing screen information from said half-tone image comprising a plurality of different filters each providing interpolation and screen removal functions; and a controller for selecting per pixel of said continuous tone image and as a function of desired output resolution, one of said filters for operation on a neighborhood of said pixel.
Claim 2
Dependent Claim
76 words
Apparatus for descreening and for performing resolution changes on a half-tone image in order to produce a continuous tone image comprising: filter means for removing screen information from said half-tone image comprising a plurality of different filters each providing interpolation and screen removal functions; and a controller for selecting per pixel of said continuous tone image and as a function of desired output resolution, one of said filters for operation on a neighborhood of said pixel.
Claim 3
Dependent Claim
20 words
Apparatus according to claim 1 and wherein said interpolation functions are provided by a plurality of frequency domain phase shifts.
Claim 4
Dependent Claim
19 words
Apparatus according to claim 1 and wherein said interpolation functions are provided by a plurality of sampled interpolation functions.
Claim 5
Dependent Claim
17 words
Apparatus according to claim 1 and wherein each of said filters is applied in a spatial domain.
Claim 6
Dependent Claim
39 words
Apparatus according to claim 1 and wherein said screen removal functions are provided by screen removal filter means for removing the entirety of frequencies at and above a predetermined frequency, wherein said frequency is a function of screen parameters.
Claim 7
Dependent Claim
12 words
Apparatus according to claim 5 and wherein said filter means are circular.
Claim 8
Dependent Claim
34 words
Apparatus according to claim 6 and wherein said screen removal filter means are low pass filters calculated according to a window method selected from the group of Hamming, Blackman, Dolph-Chebyshev and Blackman-Harris window methods.
Claim 9
Dependent Claim
19 words
Apparatus according to claim 5 and wherein said screen removal filter means are aligned with a predetermined screen angle.
Claim 10
Dependent Claim
27 words
Apparatus according to claim 5 and wherein said screen parameters are calculated on-the-fly and said screen removal functions are adjusted in accordance with the calculated screen parameters.
Claim 11
Dependent Claim
34 words
Apparatus according to claim 5 and wherein said screen removal filter means are low pass filters calculated according to a window method selected from the group of Hamming, Blackman, Dolph-Chebyshev or Blackman-Harris window methods.
Claim 12
Dependent Claim
26 words
Apparatus according to claim 1 and wherein said screen removal functions are provided by screen removal filter means for removing a screen frequency and its harmonics.
Claim 13
Dependent Claim
12 words
Apparatus according to claim 11 and wherein said filter means are circular.
Claim 14
Dependent Claim
19 words
Apparatus according to claim 11 and wherein said screen removal filter means are aligned with a predetermined screen angle.
Claim 15
Dependent Claim
27 words
Apparatus according to claim 11 and wherein said screen parameters are calculated on-the-fly and said screen removal functions are adjusted in accordance with the calculated screen parameters.
Claim 16
Dependent Claim
34 words
Apparatus according to claim 11 and wherein said screen removal filter means are low pass filters calculated according to a window method selected from the group of Hamming, Blackman, Dolph-Chebyshev or Blackman-Harris window methods.
Claim 17
Dependent Claim
24 words
Apparatus according to claim 1 and wherein said screen removal functions are provided by screen removal filter means for removing a screen frequency only.
Claim 18
Dependent Claim
12 words
Apparatus according to claim 16 and wherein said filter means are circular.
Claim 19
Dependent Claim
19 words
Apparatus according to claim 16 and wherein said screen removal filter means are aligned with a predetermined screen angle.
Claim 20
Dependent Claim
27 words
Apparatus according to claim 16 and wherein said screen parameters are calculated on-the-fly and said screen removal functions are adjusted in accordance with the calculated screen parameters.
Claim 21
Dependent Claim
34 words
Apparatus according to claim 16 and wherein said screen removal filter means are low pass filters calculated according to a window method selected from the group of Hamming, Blackman, Dolph-Chebyshev or Blackman-Harris window methods.
Claim 22
Dependent Claim
139 words
Apparatus for descreening and for performing resolution changes on a half-tone image in order to produce a continuous tone image comprising: filter means for removing screen information from said half-tone image comprising a plurality of different filters each providing interpolation and screen removal functions; and a controller for selecting per pixel of said continuous tone image and as a function of desired resolution changes, one of said filters for operation on a neighborhood of said pixel, and wherein said controller comprises: means for calculating the location of a next pixel in said continuous tone image; means for choosing a location on a predefined grid closest to said location of said next pixel, said predefined grid being defined on said continuous tone image; and means for selecting one of said filters in accordance with said location on said predefined grid.
Claim 23
Dependent Claim
139 words
Apparatus for descreening and for performing resolution changes on a half-tone image in order to produce a continuous tone image comprising: filter means for removing screen information from said half-tone image comprising a plurality of different filters each providing interpolation and screen removal functions; and a controller for selecting per pixel of said continuous tone image and as a function of desired resolution changes, one of said filters for operation on a neighborhood of said pixel, and wherein said controller comprises: means for calculating the location of a next pixel in said continuous tone image; means for choosing a location on a predefined grid closest to said location of said next pixel, said predefined grid being defined on said continuous tone image; and means for selecting one of said filters in accordance with said location on said predefined grid.
Claim 24
Dependent Claim
111 words
Apparatus for descreening and for performing resolution changes on a color printed image thereby to produce a color continuous tone image, said color printed image being separated into a plurality of input color separations and said continuous tone image being separated into output color separations, said apparatus comprising: filter means for removing screen information from each of said input color separations, said filter means comprising a plurality of different filters each providing interpolation and screen removal functions; and a controller for selecting, per pixel of each of said output color separations and as a function of desired output resolution, one of said filters for operation on a neighborhood of said pixel.
Claim 25
Dependent Claim
111 words
Apparatus for descreening and for performing resolution changes on a color printed image thereby to produce a color continuous tone image, said color printed image being separated into a plurality of input color separations and said continuous tone image being separated into output color separations, said apparatus comprising: filter means for removing screen information from each of said input color separations, said filter means comprising a plurality of different filters each providing interpolation and screen removal functions; and a controller for selecting, per pixel of each of said output color separations and as a function of desired output resolution, one of said filters for operation on a neighborhood of said pixel.
Claim 26
Dependent Claim
20 words
Apparatus according to claim 22 and wherein said interpolation functions are provided by a plurality of frequency domain phase shifts.
Claim 27
Dependent Claim
19 words
Apparatus according to claim 22 and wherein said interpolation functions are provided by a plurality of sampled interpolation functions.
Claim 28
Dependent Claim
17 words
Apparatus according to claim 22 and wherein each of said filters is applied in a spatial domain.
Claim 29
Dependent Claim
39 words
Apparatus according to claim 22 and wherein said screen removal functions are provided by screen removal filter means for removing the entirety of frequencies at and above a predetermined frequency, wherein said frequency is a function of screen parameters.
Claim 30
Dependent Claim
26 words
Apparatus according to claim 22 and wherein said screen removal functions are provided by screen removal filter means for removing a screen frequency and its harmonics.
Claim 31
Dependent Claim
24 words
Apparatus according to claim 22 and wherein said screen removal functions are provided by screen removal filter means for removing a screen frequency only.
Claim 32
Dependent Claim
59 words
Apparatus according to claim 22 and wherein said printed image is produced from a plurality of half-tone images each having its respective screen frequency and wherein said screen removal functions are provided by circular screen removal filter means for removing the entirety of frequencies at and above a given frequency which is a function of said respective screen frequencies.
Claim 33
Dependent Claim
34 words
Apparatus according to claim 29 and wherein said screen removal filter means are low pass filters calculated according to a window method selected from the group of Hamming, Blackman, Dolph-Chebyshev or Blackman-Harris window methods.
Claim 34
Dependent Claim
174 words
Apparatus for descreening and for performing resolution changes on a color printed image thereby to produce a color continuous tone image, said color printed image being separated into a plurality of input color separations and said continuous tone image being separated into output color separations, said apparatus comprising: filter means for removing screen information from each of said input color separations, said filter means comprising a plurality of different filters each providing interpolation and screen removal functions; and a controller for selecting, per pixel of each of said output color separations and as a function of desired resolution changes, one of said filters for operations on a neighborhood of said pixel, and wherein said controller comprises: means for calculating the location of a next pixel in said continuous tone image; means for choosing a location on a predefined grid closest to said location of said next pixel, said predefined grid being defined on said continuous tone image; and means for selecting one of said filters in accordance with said location on said predefined grid.
Claim 35
Dependent Claim
174 words
Apparatus for descreening and for performing resolution changes on a color printed image thereby to produce a color continuous tone image, said color printed image being separated into a plurality of input color separations and said continuous tone image being separated into output color separations, said apparatus comprising: filter means for removing screen information from each of said input color separations, said filter means comprising a plurality of different filters each providing interpolation and screen removal functions; and a controller for selecting, per pixel of each of said output color separations and as a function of desired resolution changes, one of said filters for operations on a neighborhood of said pixel, and wherein said controller comprises: means for calculating the location of a next pixel in said continuous tone image; means for choosing a location on a predefined grid closest to said location of said next pixel, said predefined grid being defined on said continuous tone image; and means for selecting one of said filters in accordance with said location on said predefined grid.
Claim 36
Independent Claim
81 words
A method for descreening and for performing resolution changes on a half-tone image in order to produce a continuous tone image including the step of: removing screen information from said half-tone image via a plurality of different filters each providing interpolation and screen removal functions; said step of removing including the step of selecting, per pixel of said continuous tone image and as a function of desired output resolution, one of said filters for operation on a neighborhood of said pixel.
Claim 37
Independent Claim
81 words
A method for descreening and for performing resolution changes on a half-tone image in order to produce a continuous tone image including the step of: removing screen information from said half-tone image via a plurality of different filters each providing interpolation and screen removal functions; said step of removing including the step of selecting, per pixel of said continuous tone image and as a function of desired output resolution, one of said filters for operation on a neighborhood of said pixel.
Claim 38
Dependent Claim
21 words
A method according to claim 32 and wherein said interpolation functions are provided by a plurality of frequency domain phase shifts.
Claim 39
Dependent Claim
20 words
A method according to claim 32 and wherein said interpolation functions are provided by a plurality of sampled interpolation functions.
Claim 40
Dependent Claim
20 words
A method according to claim 32 and wherein said step of removing screen information is performed in a spatial domain.
Claim 41
Dependent Claim
41 words
A method according to claim 32 and wherein said screen removal functions are provided by screen removal filter means for removing the entirety of frequencies at and above a predetermined frequency, wherein said frequency is a function of said screen frequency.
Claim 42
Dependent Claim
13 words
A method according to claim 36 and wherein said filter means are circular.
Claim 43
Dependent Claim
35 words
A method according to claim 37 and wherein said screen removal filter means are low pass filters calculated according to a window method selected from the group of Hamming, Blackman, Dolph-Chebyshev or Blackman-Harris window methods.
Claim 44
Dependent Claim
20 words
A method according to claim 36 and wherein said screen removal filter means are aligned with a predetermined screen angle.
Claim 45
Dependent Claim
35 words
A method according to claim 36 and wherein said screen removal filter means are low pass filters calculated according to a window method selected from the group of Hamming, Blackman, Dolph-Chebyshev or Blackman-Harris window methods.
Claim 46
Dependent Claim
27 words
A method according to claim 32 and wherein said screen removal functions are provided by screen removal filter means for removing a screen frequency and its harmonics.
Claim 47
Dependent Claim
13 words
A method according to claim 41 and wherein said filter means are circular.
Claim 48
Dependent Claim
20 words
A method according to claim 41 and wherein said screen removal filter means are aligned with a predetermined screen angle.
Claim 49
Dependent Claim
35 words
A method according to claim 41 and wherein said screen removal filter means are low pass filters calculated according to a window method selected from the group of Hamming, Blackman, Dolph-Chebyshev or Blackman-Harris window methods.
Claim 50
Dependent Claim
25 words
A method according to claim 32 and wherein said screen removal functions are provided by screen removal filter means for removing a screen frequency only.
Claim 51
Dependent Claim
13 words
A method according to claim 45 and wherein said filter means are circular.
Claim 52
Dependent Claim
20 words
A method according to claim 45 and wherein said screen removal filter means are aligned with a predetermined screen angle.
Claim 53
Dependent Claim
35 words
A method according to claim 45 and wherein said screen removal filter means are low pass filters calculated according to a window method selected from the group of Hamming, Blackman, Dolph-Chebyshev or Blackman-Harris window methods.
Claim 54
Independent Claim
111 words
A method for descreening and for performing resolution changes on a color printed image thereby to produce a color continuous tone image, said color printed image being separated into a plurality of color separations and said continuous tone image being separated into output color separations, said method comprising the step of: removing screen information from each of said color separations via a plurality of different filters each providing interpolation and screen removal functions; said step of removing including the step of selecting, per pixel of each of said output color separations and as a function of desired output resolution, one of said filters for operation on a neighborhood of said pixel.
Claim 55
Independent Claim
111 words
A method for descreening and for performing resolution changes on a color printed image thereby to produce a color continuous tone image, said color printed image being separated into a plurality of color separations and said continuous tone image being separated into output color separations, said method comprising the step of: removing screen information from each of said color separations via a plurality of different filters each providing interpolation and screen removal functions; said step of removing including the step of selecting, per pixel of each of said output color separations and as a function of desired output resolution, one of said filters for operation on a neighborhood of said pixel.
Claim 56
Dependent Claim
21 words
A method according to claim 49 and wherein said interpolation functions are provided by a plurality of frequency domain phase shifts.
Claim 57
Dependent Claim
20 words
A method according to claim 49 and wherein said interpolation functions are provided by a plurality of sampled interpolation functions.
Claim 58
Dependent Claim
20 words
A method according to claim 49 and wherein said step of removing screen information is performed in a spatial domain.
Claim 59
Dependent Claim
41 words
A method according to claim 49 and wherein said screen removal functions are provided by screen removal filter means for removing the entirety of frequencies at and above a predetermined frequency, wherein said frequency is a function of said screen frequency.
Claim 60
Dependent Claim
27 words
A method according to claim 49 and wherein said screen removal functions are provided by screen removal filter means for removing a screen frequency and its harmonics.
Claim 61
Dependent Claim
25 words
A method according to claim 49 and wherein said screen removal functions are provided by screen removal filter means for removing a screen frequency only.
Claim 62
Dependent Claim
60 words
A method according to claim 49 and wherein said printed image is produced from a plurality of half-tone images each having its respective screen frequency and wherein said screen removal functions are provided by circular screen removal filter means for removing the entirety of frequencies at and above a given frequency which is a function of said respective screen frequencies.
Claim 63
Dependent Claim
20 words
A method according to claim 56 and wherein said screen removal filter means are aligned with a predetermined screen angle.
Claim 64
Dependent Claim
35 words
A method according to claim 56 and wherein said screen removal filter means are low pass filters calculated according to a window method selected from the group of Hamming, Blackman, Dolph-Chebyshev or Blackman-Harris window methods.
Claim 65
Independent Claim
143 words
A method for descreening and for performing resolution changes on a half-tone image in order to produce a continuous tone image including the step of: removing screen information from said half-tone image via a plurality of different filters each providing interpolation and screen removal functions; said step of removing including the step of selecting, per pixel of said continuous tone image and as a function of desired resolution changes, one of said filters for operation on a neighborhood of said pixel, and wherein said step of selecting includes the steps of: calculating the location of a next pixel in said continuous tone image; choosing a location on a predefined grid closest to said location of said next pixel, said predefined grid being defined on said continuous tone image; and selecting one of said filters in accordance with said location on said predefined grid.
Claim 66
Independent Claim
143 words
A method for descreening and for performing resolution changes on a half-tone image in order to produce a continuous tone image including the step of: removing screen information from said half-tone image via a plurality of different filters each providing interpolation and screen removal functions; said step of removing including the step of selecting, per pixel of said continuous tone image and as a function of desired resolution changes, one of said filters for operation on a neighborhood of said pixel, and wherein said step of selecting includes the steps of: calculating the location of a next pixel in said continuous tone image; choosing a location on a predefined grid closest to said location of said next pixel, said predefined grid being defined on said continuous tone image; and selecting one of said filters in accordance with said location on said predefined grid.
Claim 67
Independent Claim
173 words
A method for descreening and for performing resolution changes on a color printed image thereby to produce a color continuous tone image, said color printed image being separated into a plurality of color separations and said continuous tone image being separated into output color separations, said method comprising the step of: removing screen information from each of said color separations via a plurality of different filters each providing interpolation and screen removal functions; said step of removing including the step of selecting, per pixel of each of said output color separations and as a function of desired resolution changes, one of said filters for operation on a neighborhood of said pixel, and wherein said step of selecting includes the steps of: calculating the location of a next pixel in said continuous tone image; choosing a location on a predefined grid closest to said location of said next pixel, said predefined grid being defined on said continuous tone image; and selecting one of said filters in accordance with said location on said predefined grid.
Claim 68
Independent Claim
173 words
A method for descreening and for performing resolution changes on a color printed image thereby to produce a color continuous tone image, said color printed image being separated into a plurality of color separations and said continuous tone image being separated into output color separations, said method comprising the step of: removing screen information from each of said color separations via a plurality of different filters each providing interpolation and screen removal functions; said step of removing including the step of selecting, per pixel of each of said output color separations and as a function of desired resolution changes, one of said filters for operation on a neighborhood of said pixel, and wherein said step of selecting includes the steps of: calculating the location of a next pixel in said continuous tone image; choosing a location on a predefined grid closest to said location of said next pixel, said predefined grid being defined on said continuous tone image; and selecting one of said filters in accordance with said location on said predefined grid.
Claim 69
Dependent Claim
49 words
Apparatus for descreening comprising: filter means for removing screen information from an image comprising anti-aliasing filter means and screen removal filter means, wherein said anti-aliasing filter means comprises means for changing resolution of the image and wherein said anti-aliasing filter means comprises means for accommodating misregistration of the image.
Claim 70
Dependent Claim
49 words
Apparatus for descreening comprising: filter means for removing screen information from an image comprising anti-aliasing filter means and screen removal filter means, wherein said anti-aliasing filter means comprises means for changing resolution of the image and wherein said anti-aliasing filter means comprises means for accommodating misregistration of the image.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-07-25 | 1998-01-24 | 1998-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-25 | 2002-01-24 | 2002-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-25 | 2006-01-24 | 2006-07-26 | $7700.00 | Window Closed / Lapsed |