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WO1998018263A3 - Sharpness improvement - Google Patents

Sharpness improvement Download PDF

Info

Publication number
WO1998018263A3
WO1998018263A3 PCT/IB1997/001159 IB9701159W WO9818263A3 WO 1998018263 A3 WO1998018263 A3 WO 1998018263A3 IB 9701159 W IB9701159 W IB 9701159W WO 9818263 A3 WO9818263 A3 WO 9818263A3
Authority
WO
WIPO (PCT)
Prior art keywords
sharpness
sharpness improvement
ctrl
control signal
image signal
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/IB1997/001159
Other languages
French (fr)
Other versions
WO1998018263A2 (en
Inventor
Michel Wouter Nieuwenhuizen
Van Der Leendert Albert Broeke
Van Maarten Wilhelmus Dommelen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Philips Norden AB
Original Assignee
Philips Electronics NV
Philips Norden AB
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 Philips Electronics NV, Philips Norden AB filed Critical Philips Electronics NV
Priority to JP10519146A priority Critical patent/JP2000502548A/en
Priority to KR1019980704844A priority patent/KR19990076726A/en
Priority to EP97940279A priority patent/EP0868817A2/en
Publication of WO1998018263A2 publication Critical patent/WO1998018263A2/en
Publication of WO1998018263A3 publication Critical patent/WO1998018263A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Color Image Communication Systems (AREA)

Abstract

In a sharpness-improving method, the presence of predetermined colors (R, M) in an image signal (y-in, u-in, v-in) is determined (7) to obtain a control signal (CTRL), and a sharpness of the image signal (y-in, u-in, v-in) is enhanced (1-5) in dependence upon the control signal (CTRL).
PCT/IB1997/001159 1996-10-21 1997-09-26 Sharpness improvement Ceased WO1998018263A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP10519146A JP2000502548A (en) 1996-10-21 1997-09-26 Sharpening
KR1019980704844A KR19990076726A (en) 1996-10-21 1997-09-26 Clarity Improvement Methods and Circuits
EP97940279A EP0868817A2 (en) 1996-10-21 1997-09-26 Sharpness improvement

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP96202924 1996-10-21
EP96202924.5 1996-10-21
EP97200705 1997-03-10
EP97200705.8 1997-03-10

Publications (2)

Publication Number Publication Date
WO1998018263A2 WO1998018263A2 (en) 1998-04-30
WO1998018263A3 true WO1998018263A3 (en) 1998-06-18

Family

ID=26143264

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1997/001159 Ceased WO1998018263A2 (en) 1996-10-21 1997-09-26 Sharpness improvement

Country Status (5)

Country Link
EP (1) EP0868817A2 (en)
JP (1) JP2000502548A (en)
KR (1) KR19990076726A (en)
MY (1) MY130988A (en)
WO (1) WO1998018263A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100780724B1 (en) * 2001-11-14 2007-11-30 주식회사 엘지이아이 Digital TV Sharpness Enhancement Device
CN100508625C (en) * 2004-11-01 2009-07-01 晨星半导体股份有限公司 image contrast enhancement device and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0461615A2 (en) * 1990-06-12 1991-12-18 Matsushita Electric Industrial Co., Ltd. Color image pickup apparatus
US5267028A (en) * 1988-08-26 1993-11-30 Canon Kabushiki Kaisha Solid state image pickup apparatus having luminance control
EP0621732A2 (en) * 1993-04-19 1994-10-26 Mitsubishi Denki Kabushiki Kaisha Image quality correction circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5267028A (en) * 1988-08-26 1993-11-30 Canon Kabushiki Kaisha Solid state image pickup apparatus having luminance control
US5563657A (en) * 1988-08-26 1996-10-08 Canon Kabushiki Kaisha Solid state image pickup apparatus having improved luminance control
EP0461615A2 (en) * 1990-06-12 1991-12-18 Matsushita Electric Industrial Co., Ltd. Color image pickup apparatus
EP0621732A2 (en) * 1993-04-19 1994-10-26 Mitsubishi Denki Kabushiki Kaisha Image quality correction circuit

Also Published As

Publication number Publication date
WO1998018263A2 (en) 1998-04-30
JP2000502548A (en) 2000-02-29
MY130988A (en) 2007-07-31
KR19990076726A (en) 1999-10-15
EP0868817A2 (en) 1998-10-07

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