EP0469882A2
Expired / Lapsed
EP
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Image processing apparatus
Assignee: Canon Inc
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Filing: 1991-07-31
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Granted: —
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Expires: 2011-07-31
Abstract
Abstract An image processing apparatus having a process of binarizing a multi-value image data includes a unit for inputting a multi-value image data and first pattern information for a binarization process; a first memory (24) for storing the first pattern information; and a binarizing unit for binarizing the inputted multi-value image data using the first pattern information stored in the first memory. The apparatus further includes a second memory (25) for storing in advance second pattern information, wherein the apparatus has a first mode during which the inputted multi-value image data is binarized using the first pattern information, and a second mode during which the inputted multi-value image data is binarized using the second pattern information.
Inventors
- 👤 Shuichi C/O Canon Kabushiki Kaisha Kumada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 22:49
CPC Classifications
G; G06; G06K; G06K15/00; G06V; G06V30/00; G06V30/10; G06V30/16; G06V30/162; H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4055; G06K2215/00; G06K2215/0082; G06K2215/0094
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
59 words
An image processing apparatus having a process of binarizing a multi-value image data comprising: means for inputting a multi-value image data and first pattern information for a binarization process; first storage means for storing said first pattern information; and binarizing means for binarizing said inputted multi-value image data using said first pattern information stored in said first storage means.
Claim 2
Dependent Claim
57 words
An apparatus according to claim 1, further comprising second storage means for storing in advance second pattern information, wherein said apparatus has a first mode during which said inputted multi-value image data is binarized using said first pattern information, and a second mode during which said inputted multi-value image data is binarized using said second pattern information.
Claim 3
Dependent Claim
14 words
An apparatus according to claim 2, wherein said second storage means is a ROM.
Claim 4
Dependent Claim
26 words
An apparatus according to claim 1, wherein said first and second pattern information includes patterns in correspondence with the gradations represented by said multi-value image data.
Claim 5
Dependent Claim
31 words
An apparatus according to claim 4, wherein said binarizing means reads a pattern corresponding to a gradation represented by said inputted multi-value image data from said first or second storage means.
Claim 6
Dependent Claim
19 words
An apparatus according to claim 2, further comprising selecting means for selecting one of said first and second modes.
Claim 7
Dependent Claim
19 words
An apparatus according to claim 6, wherein said selecting means manually selects one of said first and second modes.
Claim 8
Dependent Claim
24 words
An apparatus according to claim 6, wherein said selecting means selects one of said first and second modes in accordance with an external command.
Claim 9
Dependent Claim
31 words
An apparatus according to claim 2, wherein in a test printing said apparatus prints the same multi-value image data on the same print sheet using both said first and second modes.
Claim 10
Dependent Claim
34 words
An apparatus according to claim 2, wherein said first storage means stores said first pattern information having a pattern size different from that of said second pattern information stored in said second storage means.
Claim 11
Dependent Claim
15 words
An apparatus according to claim 2, further comprising display means for displaying a current mode.
Claim 12
Dependent Claim
24 words
An apparatus according to claim 2, wherein said apparatus prints an image on a predetermined area of a print sheet in a particular mode.
Claim 13
Dependent Claim
19 words
An apparatus according to claim 12, wherein said predetermined area or said specific mode is designated by an operator.
Claim 14
Dependent Claim
24 words
An apparatus according to claim 12, further comprising means for detecting, as said predetermined area, an edge portion of an image to be printed.
Claim 15
Dependent Claim
29 words
An apparatus according to claim 1, wherein said apparatus is a color image processing apparatus, and said first storage means stores said pattern information of a plurality of colors.
Claim 16
Dependent Claim
22 words
An apparatus according to claim 1, wherein said apparatus stores said first pattern information having a pattern size different from each color.
Claim 17
Dependent Claim
126 words
A printing apparatus for printing a multi-value image supplied from an external apparatus by binarizing the multi-value image data, comprising: a RAM for storing first pattern information including a first binarization pattern corresponding to each gradation of said multi-value image data, said first pattern information being supplied from said external apparatus; and a ROM for storing in advance second pattern information including a second binarization pattern corresponding to each value of said multi-value image data, wherein said apparatus includes a first mode during which said apparatus prints an image by reading said first binarization pattern corresponding to a value of said multi-value image data supplied from said external apparatus and a second mode during which said apparatus prints an image by reading said second binarization pattern.
Claim 18
Dependent Claim
27 words
An apparatus according to claim 17, wherein said apparatus is a color printer, and at least said RAM stores said first pattern information different for each color.
Claim 19
Dependent Claim
22 words
An apparatus according to claim 18, wherein said RAM stores said first pattern information having a pattern size different for each color.
Claim 20
Dependent Claim
70 words
Apparatus for printing predetermined patterns, comprising means for generating an array of multi-bit pixels defining an image, and means for processing said multi-bit pixels to produce a binarised image, said processing means being arranged to execute either dither matrix processing or error diffusion matrix processing, in accordance with a predetermined binarisation matrix, characterised in that it includes means for storing predetermined binarisation matrices corresponding to predetermined patterns to be printed.
Claim 21
Dependent Claim
27 words
Apparatus according to claim 20, further comprising means for storing a default binarisation matrix, and means for selecting between said predetermined stored matrices and said default matrix.
Claim 22
Dependent Claim
27 words
A colour printer including binarisation matrix processing means for binarising multi-bit image data, characterised in that said processing means is arranged to binarise different coloured data differently.
Claim 23
Independent Claim
69 words
A method of printing predetermined characters on a printer having a predetermined number of output density levels, comprising generating image data in a higher number of output levels and quantising said image data to said predetermined number of output levels for printing, characterised in that said quantisation is performed in dependence upon the identity of an image portion (e.g. character) to be printed, so as to optimise said quantisation.
Claim 24
Dependent Claim
26 words
An apparatus according to claim 6, wherein said selecting means selects said second mode when the first pattern information is stored in the first storage means.
Claim 25
Dependent Claim
37 words
A printing apparatus according to claim 17, further comprising means for selecting either one of first and second modes, wherein said selection means selects said second mode when the first pattern information is stored in said RAM.
References Cited (Backward Citations)
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