EP0500375A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Information recording apparatus
Assignee: Canon Inc
•
Filing: 1992-02-20
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Granted: —
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Expires: 2012-02-20
Abstract
Abstract There is disclosed an information recording apparatus capable of contour smoothing by modifying the data of an object pixel, referring to a surrounding area. There is employed a wide reference area, for example 11 x 9 pixels, divided into plural reference areas, all of which are referred to in the modification of the object pixel, and the modification of the object pixel is achieved by dividing the object pixel into plural sub pixels. In this manner the contour smoothing can be achieved in more natural manner, also in consideration of the curvature of the contour. Also the modification of the object pixel is inhibited if the original image is identified as a halftone image or certain characters, in order to avoid image blurring by such smoothing.
Inventors
- 👤 Kaoru C/O Canon Kabushiki Kaisha Seto
- 👤 Kiyoshi C/O Canon Kabushiki Kaisha Kanaiwa
- 👤 Michio C/O Canon Kabushiki Kaisha Itoh
- 👤 Hiroshi C/O Canon Kabushiki Kaisha Mano
- 👤 Hiromichi C/O Canon Kabushiki Kaisha Yamada
- 👤 Atsushi C/O Canon Kabushiki Kaisha Kashihara
- 👤 Takashi C/O Canon Kabushiki Kaisha Kawana
- 👤 Tetsuo C/O Canon Kabushiki Kaisha Saito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 10:01
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/20; G06K; G06K15/00; G06K15/02; G06K15/18; G06K15/1867; G06K15/1872; G06K15/1873; G06K15/1874
Claims Analysis
Total Claims: 60
Claim 1
Independent Claim
114 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; means for extracting predetermined plural areas, each consisting of plural bit information, from said stored bit information; feature extracting for extracting feature of bit information from each of said plural areas; feature matching means for detecting whether the feature of each of said extracted plural areas coincides with one of predetermined plural features; and information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature matching means detects the coincidence with one of predetermined plural features.
Claim 2
Dependent Claim
114 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; means for extracting predetermined plural areas, each consisting of plural bit information, from said stored bit information; feature extracting for extracting feature of bit information from each of said plural areas; feature matching means for detecting whether the feature of each of said extracted plural areas coincides with one of predetermined plural features; and information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature matching means detects the coincidence with one of predetermined plural features.
Claim 3
Dependent Claim
63 words
An apparatus according to claim 1, further comprising: modulation means for modulating a light beam according to a modification signal from said information modifying means; scanning means for scanning a recording medium by deflecting the light beam from said modulation means; and developing means for developing an electrostatic latent image, formed by said scanning means on said recording medium, into a visible image.
Claim 4
Dependent Claim
47 words
An apparatus according to claim 1, wherein the modified pixel corresponding to the object pixel is composed of sub pixels which are composed of constant pulse width units with a resolution of 4 or 8 times of the sub scanning resolution, which is 300 or 600 dot/inch.
Claim 5
Dependent Claim
31 words
An apparatus according to claim 3, wherein the resolution in the sub scanning direction is 600 dot/inch, while the resolution of the information stored in said memory means is 300 dot/inch.
Claim 6
Dependent Claim
18 words
An apparatus according to claim 1, wherein said feature matching means is composed of an exclusive logic circuit.
Claim 7
Dependent Claim
40 words
An apparatus according to claim 1, wherein said temporary memory means is composed of a matrix of M x N dots, and said feature matching means is adapted to match the feature on the dot information in the entire matrix.
Claim 8
Dependent Claim
48 words
An apparatus according to claim 1, wherein said feature matching means includes means for detecting whether the image belongs to an image concentrated area, and, in case the image is identified to belong to such concentrated area, said information modifying means inhibits the modification of the object pixel.
Claim 9
Dependent Claim
32 words
An apparatus according to claim 1, wherein the modification of said object pixel by said information modifying means is to effect smoothing on the image, thereby printing an image of high quality.
Claim 10
Dependent Claim
100 words
An apparatus according to claim 7, wherein the modification of said object pixel by said information modifying means is conducted on a contour portion consisting of continuous same information, by positioning at least a sub pixel containing information differentfrom said continuous information, in an area where the boundary of said contour portion has an angle smaller than 45° to the main scanning direction, or by positioning a sub pixel containing information same as said continuous information, in an area where the boundary of said contour portion has an angle equal to or larger than 45° to the main scanning direction.
Claim 11
Dependent Claim
105 words
An information recording apparatus comprising: temporary memory for temporarily storing a part of bit information signals generated by information signal generating means; and dot modifying means for modifying an object pixel in a reference area, based on said stored bit information, thereby smoothing the image and achieving high image quality; wherein said dot modifying means is adapted to obtain binary signals for sub pixels which are formed by dividing the recording time corresponding to said bit information in the main scanning direction into n portions (n a 3), and to modify at least six continuous pixels in response to a dot signal of continuous level.
Claim 12
Dependent Claim
105 words
An information recording apparatus comprising: temporary memory for temporarily storing a part of bit information signals generated by information signal generating means; and dot modifying means for modifying an object pixel in a reference area, based on said stored bit information, thereby smoothing the image and achieving high image quality; wherein said dot modifying means is adapted to obtain binary signals for sub pixels which are formed by dividing the recording time corresponding to said bit information in the main scanning direction into n portions (n a 3), and to modify at least six continuous pixels in response to a dot signal of continuous level.
Claim 13
Dependent Claim
63 words
An apparatus according to claim 10, further comprising: modulation means for modulating a light beam according to a modification signal from said information modifying means; scanning means for scanning a recording medium by deflecting the light beam from said modulation means; and developing means for developing an electrostatic latent image, formed by said scanning means on said recording medium, into a visible image.
Claim 14
Dependent Claim
112 words
An information recording apparatus comprising: information signal generating means for generating information signal; temporary memory means for temporarily storing a part of bit information signals generated by said information signal generating means; and modifying means for image smoothing by modifying an object dot in a reference area by referring to said stored bit information; wherein said modifying means is adapted to obtain binary signals for sub pixels which are formed by dividing the recording time corresponding to said bit information in the main scanning direction into n portions (n a 3), and the recording time of the laserforsaid sub pixel is rendered variable according to the recording density and the print speed.
Claim 15
Dependent Claim
112 words
An information recording apparatus comprising: information signal generating means for generating information signal; temporary memory means for temporarily storing a part of bit information signals generated by said information signal generating means; and modifying means for image smoothing by modifying an object dot in a reference area by referring to said stored bit information; wherein said modifying means is adapted to obtain binary signals for sub pixels which are formed by dividing the recording time corresponding to said bit information in the main scanning direction into n portions (n a 3), and the recording time of the laserforsaid sub pixel is rendered variable according to the recording density and the print speed.
Claim 16
Dependent Claim
42 words
An apparatus according to claim 12, having a record density of 300 dot/inch in the sub scanning direction, a print speed of 8 sheet/min., and a recording time of said sub pixel by the laserwithin a range from 180 to 4 nanoseconds.
Claim 17
Dependent Claim
42 words
An apparatus according to claim 12, having a record density of 300 dot/inch in the sub scanning direction, a print speed of 16 sheet/min., and a recording time of said sub pixel by the laserwithin a range from 90 to 4 nanoseconds.
Claim 18
Dependent Claim
42 words
An apparatus according to claim 12, having a record density of 600 dot/inch in the sub scanning direction, a print speed of 8 sheet/min., and a recording time of said sub pixel by the laserwithin a range from 45 to 4 nanoseconds.
Claim 19
Dependent Claim
42 words
An apparatus according to claim 12, having a record density of 600 dot/inch in the sub scanning direction, a print speed of 16 sheet/min., and a recording time of said sub pixel by the laserwithin a range from 23 to 4 nanoseconds.
Claim 20
Dependent Claim
63 words
An apparatus according to claim 12, further comprising: modulation means for modulating a light beam according to a modification signal from said information modifying means; scanning means for scanning a recording medium by deflecting the light beam from said modulation means; and developing means for developing an electrostatic latent image, formed by said scanning means on said recording medium, into a visible image.
Claim 21
Dependent Claim
91 words
An information recording apparatus of image exposure system comprising: information signal generating means for generating information signal; temporary memory means for temporarily storing a part of bit information signals generated by said information signal generating means; and modifying means for image smoothing by modifying an object dot in a reference area, by referring to said stored bit information; wherein said modifying means is adapted to effect smoothing, in the smoothing of a nearly vertical line, in such a manner that the width of said line becomes narrower than one dot width.
Claim 22
Dependent Claim
91 words
An information recording apparatus of image exposure system comprising: information signal generating means for generating information signal; temporary memory means for temporarily storing a part of bit information signals generated by said information signal generating means; and modifying means for image smoothing by modifying an object dot in a reference area, by referring to said stored bit information; wherein said modifying means is adapted to effect smoothing, in the smoothing of a nearly vertical line, in such a manner that the width of said line becomes narrower than one dot width.
Claim 23
Dependent Claim
52 words
An apparatus according to claim 18, wherein said modifying means is adapted to effect smoothing, in the smoothing of a line with an inclination equal to or larger than 45°, in such a manner that the width of said line becomes narrower by 5 to 35% than one of dot line width.
Claim 24
Dependent Claim
63 words
An apparatus according to claim 18, further comprising: modulation means for modulating a light beam according to a modification signal from said information modifying means; scanning means for scanning a recording medium by deflecting the light beam from said modulation means; and developing means for developing an electrostatic latent image, formed by said scanning means on said recording medium, into a visible image.
Claim 25
Dependent Claim
93 words
An information recording apparatus of background exposure system, comprising: information signal generating means for generating information signal; temporary memory means for temporarily storing a part of bit information signals generated by said information signal generating means; and modifying means for image smoothing by modifying an object dot in a reference area by referring to said stored bit information; wherein said modifying means is adapted to effect smoothing, in the smoothing of a nearly vertical line, in such a manner that the width of said line becomes broader than the one dot line width.
Claim 26
Dependent Claim
93 words
An information recording apparatus of background exposure system, comprising: information signal generating means for generating information signal; temporary memory means for temporarily storing a part of bit information signals generated by said information signal generating means; and modifying means for image smoothing by modifying an object dot in a reference area by referring to said stored bit information; wherein said modifying means is adapted to effect smoothing, in the smoothing of a nearly vertical line, in such a manner that the width of said line becomes broader than the one dot line width.
Claim 27
Dependent Claim
52 words
An apparatus according to claim 21, wherein said modifying means is adapted to effect smoothing, in the smoothing of a line with an inclination equal to or larger than 45°, in such a manner that the width of said line becomes broader by 5 to 35% than the one dot line width.
Claim 28
Dependent Claim
63 words
An apparatus according to claim 21, further comprising: modulation means for modulating a light beam according to a modification signal from said information modifying means; scanning means for scanning a recording medium by deflecting the light beam from said modulation means; and developing means for developing an electrostatic latent image, formed by said scanning means on said recording medium, into a visible image.
Claim 29
Dependent Claim
163 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of the predetermined plural features; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to the modified signal obtained from said information modifying means, thereby achieving recording of higher image quality; wherein said information modifying means is adapted to delete an image portion corresponding to a signal duration, equal to that of the image portion added to the left- or right-hand edge of a line image, from the right- or left-hand edge of said line image.
Claim 30
Dependent Claim
163 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of the predetermined plural features; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to the modified signal obtained from said information modifying means, thereby achieving recording of higher image quality; wherein said information modifying means is adapted to delete an image portion corresponding to a signal duration, equal to that of the image portion added to the left- or right-hand edge of a line image, from the right- or left-hand edge of said line image.
Claim 31
Dependent Claim
27 words
An apparatus according to claim 24, wherein said line image is a vertical line having an inclination equal to or larger than 45° to the horizontal direction.
Claim 32
Dependent Claim
39 words
An apparatus according to claim 24, wherein said modified pixels corresponding to the object pixel are composed of constant units of pulse duration, with a resolution of 8 or 4 times of the resolution in the sub scanning direction.
Claim 33
Dependent Claim
19 words
An apparatus according to claim 26, wherein said resolution in the sub scanning direction is 300 or 600 dot/inch.
Claim 34
Dependent Claim
43 words
An apparatus according to claim 24, wherein said temporary memory means is composed of a matrix of M x N dots, and said feature detecting means is adapted to detect the feature on the dot information of the entire area of said matrix.
Claim 35
Dependent Claim
71 words
An apparatus according to claim 24, wherein the modification of the object pixel in said recording means is achieved by conversion into binary signals in the unit of sub pixels formed by dividing the recording time corresponding to said bit information in the main scanning direction into n (n a 3), and the recording time for said sub pixel by the laser is within a range from 180 to 4 nanoseconds.
Claim 36
Dependent Claim
43 words
An apparatus according to claim 29, having a record density of 300 dot/inch in the sub scanning direction, a print speed of 8 sheet/min., and a recording time of said sub pixel by the laser within a range from 180 to 4 nanoseconds.
Claim 37
Dependent Claim
43 words
An apparatus according to claim 29, having a record density of 300 dot/inch in the sub scanning direction, a print speed of 16 sheet/min., and a recording time of said sub pixel by the laser within a range from 90 to 4 nanoseconds.
Claim 38
Dependent Claim
43 words
An apparatus according to claim 29, having a record density of 600 dot/inch in the sub scanning direction, a print speed of 8 sheet/min., and a recording time of said sub pixel by the laser within a range from 45 to 4 nanoseconds.
Claim 39
Dependent Claim
43 words
An apparatus according to claim 29, having a record density of 600 dot/inch in the sub scanning direction, a print speed of 16 sheet/min., and a recording time of said sub pixel by the laser within a range from 23 to 4 nanoseconds.
Claim 40
Dependent Claim
230 words
An information recording apparatus for forming an electrostatic latent image on a recording medium by means of information generating means for generating information signal, modulation means for modulating a light beam according to said information signal, and scanning means for deflecting said light beam thereby scanning said recording medium, and developing said electrostatic latent image on the recording medium into a visible image, comprising: temporary memory means for temporarily storing a part of bit information signals generated by said information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of predetermined plural features; and recording means for modulating said light beam into signals corresponding to sub pixels smaller than said bit information, according to the modifying signal obtained from said information modifying means, thereby effecting recording of higher image quality; wherein said information modifying means is adapted to add, to a line image, said sub pixel to the left- or right-hand edge of said line image across a non-exposure period, and the duration of signal corresponding to said added sub pixel is equal to the duration of signal corresponding to said non-exposure period.
Claim 41
Dependent Claim
230 words
An information recording apparatus for forming an electrostatic latent image on a recording medium by means of information generating means for generating information signal, modulation means for modulating a light beam according to said information signal, and scanning means for deflecting said light beam thereby scanning said recording medium, and developing said electrostatic latent image on the recording medium into a visible image, comprising: temporary memory means for temporarily storing a part of bit information signals generated by said information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of predetermined plural features; and recording means for modulating said light beam into signals corresponding to sub pixels smaller than said bit information, according to the modifying signal obtained from said information modifying means, thereby effecting recording of higher image quality; wherein said information modifying means is adapted to add, to a line image, said sub pixel to the left- or right-hand edge of said line image across a non-exposure period, and the duration of signal corresponding to said added sub pixel is equal to the duration of signal corresponding to said non-exposure period.
Claim 42
Dependent Claim
23 words
An apparatus according to claim 34, wherein said line image is lateral line with an inclination not exceeding 45° to the horizontal direction.
Claim 43
Dependent Claim
161 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of predetermined plural features; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to the modifying signal obtained from said information modifying means; wherein said information modifying means inhibits the modification of said object pixel on a line image, in case the dot arrangement on a right- or left-hand contour constitutes a rectangular portion with two or more dots in the main scanning direction and two or more dots in the sub scanning direction.
Claim 44
Dependent Claim
161 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of predetermined plural features; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to the modifying signal obtained from said information modifying means; wherein said information modifying means inhibits the modification of said object pixel on a line image, in case the dot arrangement on a right- or left-hand contour constitutes a rectangular portion with two or more dots in the main scanning direction and two or more dots in the sub scanning direction.
Claim 45
Dependent Claim
167 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of predetermined plural features; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to the modifying signal obtained from said information modifying means; wherein said information modifying means is adapted to discriminate, on a line of one bit width, whether the line width in a flexed portion of said line is at least one bit width or less than said one bit width, and to vary the algorithm for modifying said object pixel according to the result of said discrimination.
Claim 46
Dependent Claim
167 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of predetermined plural features; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to the modifying signal obtained from said information modifying means; wherein said information modifying means is adapted to discriminate, on a line of one bit width, whether the line width in a flexed portion of said line is at least one bit width or less than said one bit width, and to vary the algorithm for modifying said object pixel according to the result of said discrimination.
Claim 47
Dependent Claim
133 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of predetermined plural features; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to the modifying signal obtained from said information modifying means; wherein said information modifying means is adapted to inhibit the modification of said object pixel ona white line with one bit line width.
Claim 48
Dependent Claim
133 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of predetermined plural features; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to the modifying signal obtained from said information modifying means; wherein said information modifying means is adapted to inhibit the modification of said object pixel ona white line with one bit line width.
Claim 49
Dependent Claim
23 words
An apparatus according to claim 38, wherein said line is a lateral line with an inclination not exceeding 45° to the horizontal direction.
Claim 50
Dependent Claim
170 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; first feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; second feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; third feature detecting means for detecting that said first feature detecting means detects the coincidence with one of said predetermined plural features and that said second feature detecting means does not detect the coincidence with any of said predetermined plural features; information modifying means for modifying the print information of an object pixel specified in the information stored in said temporary memory means, according to the result of detection by said third feature detecting means; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to a modifying signal obtained from said information modifying means.
Claim 51
Dependent Claim
170 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; first feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; second feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; third feature detecting means for detecting that said first feature detecting means detects the coincidence with one of said predetermined plural features and that said second feature detecting means does not detect the coincidence with any of said predetermined plural features; information modifying means for modifying the print information of an object pixel specified in the information stored in said temporary memory means, according to the result of detection by said third feature detecting means; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to a modifying signal obtained from said information modifying means.
Claim 52
Dependent Claim
18 words
An apparatus according to claim 40, wherein said information signal generating means includes means for generating Kanji characters.
Claim 53
Dependent Claim
148 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of predetermined plural features; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to the modifying signal obtained from said information modifying means; wherein said feature detecting means is provided, as the predetermined plural features, with a pair of pairs of features symmetrical in the main scanning direction and a pair or parts of features symmetrical in the sub scanning direction.
Claim 54
Dependent Claim
148 words
An information recording apparatus comprising: temporary memory means for temporarily storing a part of bit information signals generated by information signal generating means; feature detecting means for detecting whether the feature of said stored bit information coincides with one of predetermined plural features; information modifying means for modifying the print information of a specified object pixel in the information stored in said temporary memory means, in case said feature detecting means detects the coincidence with one of predetermined plural features; and recording means for modulating a light beam into signals corresponding to sub pixels smaller than said bit information, according to the modifying signal obtained from said information modifying means; wherein said feature detecting means is provided, as the predetermined plural features, with a pair of pairs of features symmetrical in the main scanning direction and a pair or parts of features symmetrical in the sub scanning direction.
Claim 55
Independent Claim
60 words
A method of modifying pixel data characterised by, storing a block of said data (Figure 11A) including a pixel (5F) of interest; dividing said block into a plurality of regions (Y1, Y2; X1, X2); assessing a feature of said regions; comparing said assessed features with predetermined feature values; and, modifying the pixel of interest on the basis of said comparison.
Claim 56
Independent Claim
60 words
A method of modifying pixel data characterised by, storing a block of said data (Figure 11A) including a pixel (5F) of interest; dividing said block into a plurality of regions (Y1, Y2; X1, X2); assessing a feature of said regions; comparing said assessed features with predetermined feature values; and, modifying the pixel of interest on the basis of said comparison.
Claim 57
Dependent Claim
12 words
A method according to claim 43, wherein some of said regions overlap.
Claim 58
Dependent Claim
21 words
A method according to claim 43 or claim 44, wherein the pixel of interest is at the centre of the block.
Claim 59
Independent Claim
22 words
A method according to any of claims 43 to 45, wherein said block consists of a matrix of 9 X 11 pixels.
Claim 60
Independent Claim
31 words
A method according to any of claims 43 to 46, wherein the feature for a region identifies whether all pixels within said region have the same value or have different values.
References Cited (Backward Citations)
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