WO2001037248A2 - Reproduction de caracteres - Google Patents

Reproduction de caracteres Download PDF

Info

Publication number
WO2001037248A2
WO2001037248A2 PCT/EP2000/011415 EP0011415W WO0137248A2 WO 2001037248 A2 WO2001037248 A2 WO 2001037248A2 EP 0011415 W EP0011415 W EP 0011415W WO 0137248 A2 WO0137248 A2 WO 0137248A2
Authority
WO
WIPO (PCT)
Prior art keywords
pixel density
image
increased
horizontal pixel
characters
Prior art date
Application number
PCT/EP2000/011415
Other languages
English (en)
Other versions
WO2001037248A3 (fr
Inventor
Albertus A. S. Sluyterman
Michiel A. Klompenhouwer
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to EP00979588A priority Critical patent/EP1196911A2/fr
Priority to KR1020017008868A priority patent/KR20010101509A/ko
Priority to JP2001539264A priority patent/JP2003515195A/ja
Publication of WO2001037248A2 publication Critical patent/WO2001037248A2/fr
Publication of WO2001037248A3 publication Critical patent/WO2001037248A3/fr

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/22—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of characters or indicia using display control signals derived from coded signals representing the characters or indicia, e.g. with a character-code memory
    • G09G5/24—Generation of individual character patterns
    • G09G5/28—Generation of individual character patterns for enhancement of character form, e.g. smoothing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/22—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of characters or indicia using display control signals derived from coded signals representing the characters or indicia, e.g. with a character-code memory
    • G09G5/24—Generation of individual character patterns
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0421—Horizontal resolution change

Definitions

  • the invention relates to a method and device for character reproduction.
  • the invention provides a method, a device, a computer, and a monitor as defined in the independent claims.
  • the dependent claims define advantageous embodiments.
  • Fig. 1 shows a prior art display of an italic character /, using a square pixel grid
  • Fig. 2 shows a reduction of the staircase effect by increasing the horizontal pixel density
  • Fig. 3 shows an increase of the horizontal pixel density while maintaining the thickness in accordance with the present invention
  • Fig. 4 shows a first embodiment of the invention
  • Fig. 5 shows a second embodiment of the invention
  • Fig. 6 shows a third embodiment of the invention.
  • the invention is based on the recognition that, for example, doubling only the horizontal pixel density would solve the problem, as can be seen in Fig. 2.
  • Fig. 2. One can see that the wavelength of the stairs, measured along the character is halved.
  • Fig. 3 This is not the purpose of doubling the horizontal pixel density, and will also not happen in case of true type fonts.
  • Fig. 3. In order to see if this would also be true in practice, we took a PC with a special video card, and programmed that video card to display 600 lines with 1600 (instead of 800) pixels per line. Initially this resulted in a doubled number of characters, which was not the goal. Then we horizontally stretched the text to regain the original character width.
  • a simple embodiment of the invention can be summarized as follows.
  • the reproduction of characters, in particular italic characters and characters like A,V,WNA, on a CRT display can be improved by using non-square addressable pixels.
  • the horizontal addressable pixel density is increased without increasing the number of scanned lines by a same factor.
  • the impact of this invention is that improved character quality can be obtained at very limited cost. It provides extra opportunities for video card manufacturers.
  • By display driving with pixels that are smaller than they are high a better picture quality can be realized at lower cost.
  • the pixel width is halved, the characters are doubled in width by means of software, e.g. by means of the driver software of the video graphics card. This allows for an improved display of the characters, especially of italic characters. In this embodiment, this improvement can be realized without requiring more expensive monitors that have higher scan frequencies and larger video bandwidths.
  • the invention can be used in video graphics cards, and in driver software for video graphics cards.
  • Fig. 4 shows a monitor Mon, the hardware HW of which is not changed by the invention.
  • the monitor Mon is driven by a personal computer PC comprising an application program AP, a software driver of the video card DVc, and a video card Nc.
  • the software SW of the application program AP is not changed by the invention.
  • the video card driver software and the video card hardware are changed by the invention.
  • the video card driver software is changed in that the character fonts are characterized as large in the horizontal direction.
  • the video card hardware is changed in that the ratio between the horizontal pixel number to the vertical scan line number is substantially larger (e.g.
  • the mouse driver software is changed as well to prevent the mouse from being less sensitive for horizontal movements as for vertical movements as a result of the video card hardware and video card driver software adaptations.
  • Fig. 5 shows an embodiment Nc' of a video card that has the advantage that no adaptation in the video card driver software is required.
  • a first frame memory buffer FM-4x that is four times as large as a reference size
  • the number of pixels is doubled both horizontally as vertically, whereby the character magnitude is set at 200%.
  • the line number that has been doubled as a result of this vertical pixel number doubling is halved to the original line number by means of a vertical sealer VS.
  • the result is applied to a second frame memory buffer FM-2x that is two times as large as the reference size, and thereafter to a digital-to analog converter DAC.
  • the first frame memory buffer FM-4x and the second frame memory buffer FM-2x may be part of a single memory unit.
  • Fig. 6 shows a modification of the embodiment of Fig. 4. The differences are as follows: in the PC, the video card driver software DVc (SW) is set at 200% magnitude, just like in Fig. 5; in the PC, the video card hardware Vc-4x (HW) is arranged for handling data that is four times enlarged as compared to the reference magnitude; and in the monitor Mon', the vertical sealer NS is present, while in the Fig. 5 embodiment, the vertical sealer VS was part of the video card Nc' in the PC.
  • the vertical sealer NS is placed between an analog-to-digital converter ADC and a digital-to-analog converter DAC. An output of the DAC is applied to the analog remainder (remaining analog circuitry R and a display D) of the monitor circuitry. Any other digital monitor circuitry would be placed between the vertical sealer VS and the DAC.
  • the step of increasing a horizontal pixel density of the image to obtain an intermediate image having an increased horizontal pixel density without increasing a number of scanning lines (at all or by a same factor), may very well be carried out by first increasing both the horizontal pixel density and the vertical pixel density, followed by a reduction of the vertical pixel density.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Image Processing (AREA)

Abstract

Selon l'invention, la reproduction de caractères, en particulier de caractères en italique et de caractères comme A, V, W, VA, sur un affichage à tube cathodique peut être améliorée par l'utilisation de pixels adressables non carrés. La densité de pixels adressables horizontaux est augmentée sans augmentation, d'un même facteur, du nombre de lignes de balayage.
PCT/EP2000/011415 1999-11-16 2000-11-15 Reproduction de caracteres WO2001037248A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP00979588A EP1196911A2 (fr) 1999-11-16 2000-11-15 Reproduction de caracteres
KR1020017008868A KR20010101509A (ko) 1999-11-16 2000-11-15 글자체 재생 방법 및 장치
JP2001539264A JP2003515195A (ja) 1999-11-16 2000-11-15 文字再生

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
EP99203818 1999-11-16
EP99203818.2 1999-11-16
EP99204221.8 1999-12-09
EP99204221 1999-12-09
EP00200528.8 2000-02-17
EP00200528 2000-02-17

Publications (2)

Publication Number Publication Date
WO2001037248A2 true WO2001037248A2 (fr) 2001-05-25
WO2001037248A3 WO2001037248A3 (fr) 2002-01-17

Family

ID=27223236

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/011415 WO2001037248A2 (fr) 1999-11-16 2000-11-15 Reproduction de caracteres

Country Status (4)

Country Link
EP (1) EP1196911A2 (fr)
JP (1) JP2003515195A (fr)
KR (1) KR20010101509A (fr)
WO (1) WO2001037248A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003034380A2 (fr) * 2001-10-19 2003-04-24 Koninklijke Philips Electronics N.V. Unite de traitement d'affichage et procede associe permettant d'afficher une image, et dispositif d'affichage comprenant une telle unite
CN101572050B (zh) * 2008-04-30 2011-08-24 佳能株式会社 图像处理装置及图像处理方法
CN101290742B (zh) * 2007-04-17 2011-09-14 瑞萨电子株式会社 图像输出设备和图像显示设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2250276B1 (de) * 1972-10-13 1974-04-18 Institut Fuer Rundfunktechnik Gmbh, 8000 Muenchen System zur digitalelektronischen Erzeugung alphanumerischer Zeichen als äquivalentes Videosignal
US4250502A (en) * 1978-05-02 1981-02-10 Siemens Aktiengesellschaft Resolution for a raster display
US5581358A (en) * 1993-06-14 1996-12-03 Canon Kabushiki Kaisha Information recording apparatus with smoothing processing via pixel feature detection and recording density variation and toner conservation
US5684933A (en) * 1995-08-01 1997-11-04 Kyocera Corporation Method and apparatus for forming images using a pre and post smoothing bit thinning down process
WO2000067247A1 (fr) * 1999-04-29 2000-11-09 Microsoft Corp Procedes, dispositifs et structures de donnees permettant de determiner des parametres de glyphes pour assurer le rendu de textes sur visuel a bandes horizontales

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2737711B2 (ja) * 1995-07-14 1998-04-08 日本電気株式会社 ポインティングデバイスカーソル移動量調節機能

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2250276B1 (de) * 1972-10-13 1974-04-18 Institut Fuer Rundfunktechnik Gmbh, 8000 Muenchen System zur digitalelektronischen Erzeugung alphanumerischer Zeichen als äquivalentes Videosignal
US4250502A (en) * 1978-05-02 1981-02-10 Siemens Aktiengesellschaft Resolution for a raster display
US5581358A (en) * 1993-06-14 1996-12-03 Canon Kabushiki Kaisha Information recording apparatus with smoothing processing via pixel feature detection and recording density variation and toner conservation
US5684933A (en) * 1995-08-01 1997-11-04 Kyocera Corporation Method and apparatus for forming images using a pre and post smoothing bit thinning down process
WO2000067247A1 (fr) * 1999-04-29 2000-11-09 Microsoft Corp Procedes, dispositifs et structures de donnees permettant de determiner des parametres de glyphes pour assurer le rendu de textes sur visuel a bandes horizontales

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 06, 30 June 1997 (1997-06-30) & JP 09 034430 A (NEC CORP), 7 February 1997 (1997-02-07) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003034380A2 (fr) * 2001-10-19 2003-04-24 Koninklijke Philips Electronics N.V. Unite de traitement d'affichage et procede associe permettant d'afficher une image, et dispositif d'affichage comprenant une telle unite
WO2003034380A3 (fr) * 2001-10-19 2003-12-04 Koninkl Philips Electronics Nv Unite de traitement d'affichage et procede associe permettant d'afficher une image, et dispositif d'affichage comprenant une telle unite
CN101290742B (zh) * 2007-04-17 2011-09-14 瑞萨电子株式会社 图像输出设备和图像显示设备
CN101572050B (zh) * 2008-04-30 2011-08-24 佳能株式会社 图像处理装置及图像处理方法

Also Published As

Publication number Publication date
JP2003515195A (ja) 2003-04-22
EP1196911A2 (fr) 2002-04-17
KR20010101509A (ko) 2001-11-14
WO2001037248A3 (fr) 2002-01-17

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