MY118136A - Image quality correction circuit for video signals - Google Patents

Image quality correction circuit for video signals

Info

Publication number
MY118136A
MY118136A MYPI98000933A MYPI9800933A MY118136A MY 118136 A MY118136 A MY 118136A MY PI98000933 A MYPI98000933 A MY PI98000933A MY PI9800933 A MYPI9800933 A MY PI9800933A MY 118136 A MY118136 A MY 118136A
Authority
MY
Malaysia
Prior art keywords
correction circuit
video signals
tone
image quality
histogram
Prior art date
Application number
MYPI98000933A
Inventor
Minoru Kawabata
Masahiro Takeshima
Atsuhisa Kageyama
Hiroko Sugimoto
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of MY118136A publication Critical patent/MY118136A/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/90—Dynamic range modification of images or parts thereof
    • G06T5/92—Dynamic range modification of images or parts thereof based on global image properties
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/40—Image enhancement or restoration using histogram techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10016—Video; Image sequence
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/20—Special algorithmic details
    • G06T2207/20004—Adaptive image processing
    • G06T2207/20012—Locally adaptive
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30196—Human being; Person
    • G06T2207/30201—Face

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

THE TONE OF VIDEO SIGNALS IS CORRECTED WITHOUT DEGRADING THE TONE OF CERTAIN IMAGE FEATURES, SUCH AS A HUMAN FACE. A GAIN CONTROLLER (2) OPERATES AND OUTPUTS AN ADJUSTMENT VALUE USING A HISTOGRAM OUTPUT PRODUCED BY A HISTOGRAM GENERATOR (1). AN AVERAGE VALUE OF PICTURE LEVELS ON A SCREEN IS DETECTED BY AN AVERAGE PICTURE LEVEL DETECTOR (5). A HISTOGRAM CORRECTION CIRCUIT (3) CALCULATES A LOOK-UP TABLE, AND A VIDEO SIGNAL CORRECTION CIRCUIT (4) CORRECTS THE TONE OF THE VIDEO SIGNALS USING THE LOOK-UP TABLE. (FIGURE 1)
MYPI98000933A 1997-03-06 1998-03-04 Image quality correction circuit for video signals MY118136A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5133497 1997-03-06

Publications (1)

Publication Number Publication Date
MY118136A true MY118136A (en) 2004-09-30

Family

ID=12884035

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI98000933A MY118136A (en) 1997-03-06 1998-03-04 Image quality correction circuit for video signals

Country Status (9)

Country Link
US (1) US6373533B1 (en)
EP (1) EP0910917A1 (en)
JP (1) JP4011122B2 (en)
KR (1) KR100512542B1 (en)
CN (1) CN1121114C (en)
BR (1) BR9805930A (en)
CZ (1) CZ294352B6 (en)
MY (1) MY118136A (en)
WO (1) WO1998039914A1 (en)

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Also Published As

Publication number Publication date
KR20000065211A (en) 2000-11-06
BR9805930A (en) 1999-08-31
US6373533B1 (en) 2002-04-16
WO1998039914A1 (en) 1998-09-11
CZ294352B6 (en) 2004-12-15
CZ354198A3 (en) 1999-04-14
JP2000513907A (en) 2000-10-17
KR100512542B1 (en) 2005-10-21
JP4011122B2 (en) 2007-11-21
CN1121114C (en) 2003-09-10
EP0910917A1 (en) 1999-04-28
CN1216192A (en) 1999-05-05

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