Patent EP0199502A2 successfully refreshed from Google Patents.
EP0199502A2
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EP
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Method and apparatus for improving the quality of an image produced by a raster display device
Assignee: International Business Machines Corp
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Filing: 1986-04-10
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Granted: —
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Expires: 2006-04-10
Abstract
Abstract The present invention relates to a method and apparatus for improving the quality of an image (13) produced by raster display device, which forms an image by a plurality of picture elements (pels), comprising modifying the intensity of selected pels in the image so as to tend to smooth an edge of the image. The method of the invention is characterised by selecting a plurality of arrays of pels from the pels forming at least one edge of the image the quality of which is to be improved, comparing the pattern of pels in each array with a stored set of patterns, each of which represents a pattern of pels forming at least tone edge of an image and has rules associated with it relating to modifying the intensity of at least one pel of the pattern, so as to determine a matching pattern for each array, and modifying the intensity of at least one pel of each array in accordance with the rules relating to the matching stored pattern. The invention also relates to apparatus for performing a method as above.
Inventors
- 👤 William Mark Doumas
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 22:27
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/20; G06; G06K; G06K15/00; G06K15/02; G06K2215/00; G06K2215/0002; G06K2215/004; G06K2215/0054; G06K2215/0057
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
154 words
A method of improving the quality of an image - (13) produced by a raster display device, which forms an image by a plurality of picture elements - (pels), comprising modifying the intensity of selected pels in said image so as to tend to smooth an edge of said image, characterised by selecting a plurality of arrays of pels from the pels forming at least one edge of said image, comparing the pattern of pels in each array with a stored set of patterns, each of which represents a pattern of pels forming at least one edge of an image and has rules associated with it relating to modifying the intensity of at least one pel of the pattern, so as to determine a matching pattern for each array, and modifying the intensity of at least one pel - (P2,2) of each array in accordance with the rules relating to the matching stored pattern.
Claim 2
Independent Claim
154 words
A method of improving the quality of an image - (13) produced by a raster display device, which forms an image by a plurality of picture elements - (pels), comprising modifying the intensity of selected pels in said image so as to tend to smooth an edge of said image, characterised by selecting a plurality of arrays of pels from the pels forming at least one edge of said image, comparing the pattern of pels in each array with a stored set of patterns, each of which represents a pattern of pels forming at least one edge of an image and has rules associated with it relating to modifying the intensity of at least one pel of the pattern, so as to determine a matching pattern for each array, and modifying the intensity of at least one pel - (P2,2) of each array in accordance with the rules relating to the matching stored pattern.
Claim 3
Dependent Claim
82 words
A method as claimed in Claim 1 characterised in that each selected array of pels represents part of an edge (16) of said image, each stored pattern of pels represents an edge of an image defined by a line (22), and the rules associated with each stored pattern state that the centre pel (P2,2) of the pattern is to be modified by changing its intensity to a level corresponding to the position of said line as it passes through said centre pel.
Claim 4
Dependent Claim
24 words
A method as claimed in Claim 2 characterised in that the line defined in each pattern extends at a predetermined angle to the horizontal.
Claim 5
Dependent Claim
27 words
A method as claimed in Claim 3 characterised in that each line extends at an angle to the horizontal which is 0° or a multiple of 22.5°.
Claim 6
Independent Claim
24 words
A method as claimed in any one of the preceding claims characterised in that each array is a 3 x 3 array of pels.
Claim 7
Dependent Claim
10 words
A method as claimed in Claim 1 characterised in that
Claim 8
Dependent Claim
16 words
each array represents part of a pair of edges defining a narrow line in said image,
Claim 9
Dependent Claim
16 words
each array represents part of a pair of edges defining a narrow line in said image,
Claim 10
Dependent Claim
18 words
each stored pattern of pels represents the edges of a narrow line forming part of an image, and
Claim 11
Dependent Claim
18 words
each stored pattern of pels represents the edges of a narrow line forming part of an image, and
Claim 12
Dependent Claim
39 words
the rules associated with each stored pattern state that the centre pel of the pattern is to be modified by changing its intensity to a level corresponding to the amount by which said narrow line occupies said centre pel.
Claim 13
Dependent Claim
39 words
the rules associated with each stored pattern state that the centre pel of the pattern is to be modified by changing its intensity to a level corresponding to the amount by which said narrow line occupies said centre pel.
Claim 14
Dependent Claim
25 words
A method as claimed in Claim 6 characterised in that the narrow line defined in each pattern extends at a predetermined angle to the horizontal.
Claim 15
Dependent Claim
172 words
Apparatus for improving the quality of an image (13) produced by a raster display device, which forms an image by a plurality of picture elements - (pels), comprising means for modifying the intensity of selected pels in said image so as to tend to smooth an edge of said image, characterised in that said modifying means comprises means for storing a set of patterns of pels each of which represents a pattern of pels forming at least one edge of an image and has rules associated with it relating to modifying the intensity of at least one pel of the pattern, means for selecting a plurality of arrays of pels from the pels forming at least one edge of said image, means for comparing the pattern of pels in each array with said stored set of patterns, so as to determine a matching pattern for each array, and means for modifying the intensity of at least one pel of each array in accordance with the rules relating to the matching stored pattern.
Claim 16
Dependent Claim
172 words
Apparatus for improving the quality of an image (13) produced by a raster display device, which forms an image by a plurality of picture elements - (pels), comprising means for modifying the intensity of selected pels in said image so as to tend to smooth an edge of said image, characterised in that said modifying means comprises means for storing a set of patterns of pels each of which represents a pattern of pels forming at least one edge of an image and has rules associated with it relating to modifying the intensity of at least one pel of the pattern, means for selecting a plurality of arrays of pels from the pels forming at least one edge of said image, means for comparing the pattern of pels in each array with said stored set of patterns, so as to determine a matching pattern for each array, and means for modifying the intensity of at least one pel of each array in accordance with the rules relating to the matching stored pattern.
Claim 17
Dependent Claim
9 words
Apparatus as claimed in Claim 8 characterised in that
Claim 18
Dependent Claim
66 words
each array represents an edge (16) of said image, each stored pattern of pels represents an edge of an image defined by a line (22), and the rules associated with each pattern state that the centre pel (P2,2) of the pattern is to be modified by changing its intensity to a level corresponding to the position of said line as it passes through said centre pel.
Claim 19
Dependent Claim
66 words
each array represents an edge (16) of said image, each stored pattern of pels represents an edge of an image defined by a line (22), and the rules associated with each pattern state that the centre pel (P2,2) of the pattern is to be modified by changing its intensity to a level corresponding to the position of said line as it passes through said centre pel.
Claim 20
Dependent Claim
55 words
Apparatus as claimed in Claim 8 or Claim 9 characterised in that said modifying means comprises a plurality of registers (40, 42, 44) for storing said arrays of pels, and a Read Only Memory device - (46, 48) for storing said set of patterns and for comparing each array with said stored set of patterns.
References Cited (Backward Citations)
No citation records indexed.
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