US5739808A
Expired / Lapsed
US
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Display control method and apparatus
Assignee: Canon Inc
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Filing: 1995-10-25
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Granted: 1998-04-14
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Expires: 2015-10-25
Abstract
Abstract The present invention is to provide a display control method and apparatus which can display a high-quality image excellent in a gradation even if a resolution of a display device is higher than that of an input image. The display control apparatus which displays input image data of a first resolution on a display device of which a second resolution is higher than the first resolution comprises a calculation circuit for calculating a ratio of the first resolution to the second resolution, a determination circuit for determining the number of gradations on the basis of the ratio in case where the display device displays one pixel data of the input image data to a processing circuit for halftone processing the input image data to produce a value of the number of gradations determined by the a determination circuit and a data conversion circuit for converting the halftone-processed image data into data having a form which can be displayed on the display device.
Inventors
- 👤 Kazumi Suga
- 👤 Hiroshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:24
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G3/3629; G09G2340/00; G09G2340/04; G09G2340/0407; G09G3/2007; G09G3/2044; G09G3/2051; G09G3/2059
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
121 words
A display control apparatus which displays input image data of a first resolution on a display having a second resolution higher than the first resolution, comprising: calculation means for calculating a ratio of the first resolution to the second resolution; determination means for determining a number of gradations on the basis of the ratio calculated by said calculation means, in a case where the display device displays one pixel data of the input image data; processing mean for halftone processing the input image data to produce a value of the number of gradations determined by said determination means; and data conversion means for converting the halftone-processed image data into data having a form which can be displayed on the display device.
Claim 2
Dependent Claim
121 words
A display control apparatus which displays input image data of a first resolution on a display having a second resolution higher than the first resolution, comprising: calculation means for calculating a ratio of the first resolution to the second resolution; determination means for determining a number of gradations on the basis of the ratio calculated by said calculation means, in a case where the display device displays one pixel data of the input image data; processing mean for halftone processing the input image data to produce a value of the number of gradations determined by said determination means; and data conversion means for converting the halftone-processed image data into data having a form which can be displayed on the display device.
Claim 3
Dependent Claim
37 words
An apparatus according to claim 1, wherein said determination means determines the number of gradations which can be expressed by plural pixels on the display device, on the basis of the ratio calculated by said calculation means.
Claim 4
Dependent Claim
18 words
An apparatus according to claim 1, wherein the display device can perform a two-level display for one pixel.
Claim 5
Dependent Claim
24 words
An apparatus according to claim 1, wherein the display device can perform a multi-level (equal to or greater than ternary) display for one pixel.
Claim 6
Dependent Claim
22 words
An apparatus according to claim 1, wherein said processing means halftone processes the input image data in a multi-value error diffusion method.
Claim 7
Dependent Claim
21 words
An apparatus according to claim 1, wherein said processing means halftone processes the input image data in a multi-value dither method.
Claim 8
Dependent Claim
16 words
An apparatus according to claim 1, wherein the display device comprises a ferroelectric liquid crystal display.
Claim 9
Dependent Claim
19 words
An apparatus according to claim 1, further comprising input means for inputting image data transmitted from an external device.
Claim 10
Dependent Claim
18 words
An apparatus according to claim 8, wherein said input means inputs image data transmitted from a host computer.
Claim 11
Dependent Claim
15 words
An apparatus according to claim 8, wherein said input means inputs NTSC-type TV image data.
Claim 12
Dependent Claim
81 words
An apparatus according to claim 1, wherein said determination means determines the number of gradations which can be expressed by utilizing N×M pixels of the display device when a horizontal resolution of the display device is N times as large as that of the input image data and a vertical resolution of the display device is M times as large as that of the input image data, and said conversion means converts the halftone-processed image data into data of N×M pixels.
Claim 13
Dependent Claim
27 words
An apparatus according to claim 1, further comprising scanning means for display scanning the display device on the basis of data obtained by said data conversion means.
Claim 14
Dependent Claim
95 words
An apparatus according to claim 12, wherein said determination means determines the number of gradations which can be expressed by utilizing N pixels of the display device when a horizontal resolution of the display device is N times as large as that of the input image data and a vertical resolution of the display device is M times as large as that of the input image data, said conversion means converts the halftone-processed image data into data of N pixels, and said scanning means scans the converted data of N pixels simultaneously for M lines.
Claim 15
Dependent Claim
138 words
A display control apparatus which displays input image data of a first resolution on a display having a second resolution higher than the first resolution, comprising: determination means for determining a number of gradations which can be expressed by utilizing N pixels of the display device when a horizontal resolution of the display device is N times as large as that of the input image data and a vertical resolution of the display device is M times as large as that of the input image data; processing means for halftone processing the input image data to produce a value of the number of gradations determined by said determination means; and display means for setting one line of the halftone-processed image data as M lines of image data and simultaneously scanning and displaying the M lines of image data.
Claim 16
Dependent Claim
138 words
A display control apparatus which displays input image data of a first resolution on a display having a second resolution higher than the first resolution, comprising: determination means for determining a number of gradations which can be expressed by utilizing N pixels of the display device when a horizontal resolution of the display device is N times as large as that of the input image data and a vertical resolution of the display device is M times as large as that of the input image data; processing means for halftone processing the input image data to produce a value of the number of gradations determined by said determination means; and display means for setting one line of the halftone-processed image data as M lines of image data and simultaneously scanning and displaying the M lines of image data.
Claim 17
Dependent Claim
38 words
An apparatus according to claim 14, further comprising calculation means for calculating a ratio of the first resolution to the second resolution, and wherein said determination means determines the number of gradations in accordance with the calculated ratio.
Claim 18
Dependent Claim
22 words
An apparatus according to claim 14, wherein said processing means halftone processes the input image data in a multi-value error diffusion method.
Claim 19
Dependent Claim
21 words
An apparatus according to claim 14, wherein said processing means halftone processes the input image data in a multi-value dither method.
Claim 20
Dependent Claim
16 words
An apparatus according to claim 14, wherein the display device comprises a ferroelectric liquid crystal display.
Claim 21
Dependent Claim
122 words
A display control method for displaying input image data of a first resolution on a display having a second resolution higher than the first resolution, said method comprising: a calculation step of calculating a ratio of the first resolution to the second resolution; a determination step of determining number of gradations on the basis of the calculated ratio in a case where the display device displays one pixel data of the input image data; a processing step of halftone processing the input image data to produce a value of the number of gradations determined in said determination step; and a data conversion step of converting the halftone-processed image data into data having a form which can be displayed on the display device.
Claim 22
Dependent Claim
122 words
A display control method for displaying input image data of a first resolution on a display having a second resolution higher than the first resolution, said method comprising: a calculation step of calculating a ratio of the first resolution to the second resolution; a determination step of determining number of gradations on the basis of the calculated ratio in a case where the display device displays one pixel data of the input image data; a processing step of halftone processing the input image data to produce a value of the number of gradations determined in said determination step; and a data conversion step of converting the halftone-processed image data into data having a form which can be displayed on the display device.
Claim 23
Dependent Claim
143 words
A display control method for displaying input image data of a first resolution on a display having a second resolution higher than the first resolution, said method comprising: a determination step of determining a number of gradations which can be expressed by utilizing N pixels of the display device when a horizontal resolution of the display device is N times as large as that of the input image data and a vertical resolution of the display device is M times as large as that of the input image data; a processing step of halftone processing the input image data to produce a value of the number of gradations determined in said determination step; and a display step of setting one line of the halftone-processed image data as M lines of image data and simultaneously scanning and displaying the M lines of image data.
Claim 24
Dependent Claim
143 words
A display control method for displaying input image data of a first resolution on a display having a second resolution higher than the first resolution, said method comprising: a determination step of determining a number of gradations which can be expressed by utilizing N pixels of the display device when a horizontal resolution of the display device is N times as large as that of the input image data and a vertical resolution of the display device is M times as large as that of the input image data; a processing step of halftone processing the input image data to produce a value of the number of gradations determined in said determination step; and a display step of setting one line of the halftone-processed image data as M lines of image data and simultaneously scanning and displaying the M lines of image data.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-04-13 | 2001-10-13 | 2002-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-13 | 2005-10-13 | 2006-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-13 | 2009-10-13 | 2010-04-14 | $7700.00 | Window Closed / Lapsed |