CA2030142A1 - White balance adjusting apparatus for automatically adjusting white balance in response to color information signal obtained from image sensing device - Google Patents

White balance adjusting apparatus for automatically adjusting white balance in response to color information signal obtained from image sensing device

Info

Publication number
CA2030142A1
CA2030142A1 CA2030142A CA2030142A CA2030142A1 CA 2030142 A1 CA2030142 A1 CA 2030142A1 CA 2030142 A CA2030142 A CA 2030142A CA 2030142 A CA2030142 A CA 2030142A CA 2030142 A1 CA2030142 A1 CA 2030142A1
Authority
CA
Canada
Prior art keywords
white balance
image sensing
evaluating values
response
sensing device
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.)
Granted
Application number
CA2030142A
Other languages
French (fr)
Other versions
CA2030142C (en
Inventor
Toshinobu Haruki
Kenichi Kikuchi
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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
Priority claimed from JP1337352A external-priority patent/JP2532956B2/en
Priority claimed from JP2047915A external-priority patent/JP2523036B2/en
Priority claimed from JP2058652A external-priority patent/JP2532962B2/en
Priority claimed from JP2080102A external-priority patent/JPH0828878B2/en
Priority claimed from JP2090902A external-priority patent/JPH0828879B2/en
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Publication of CA2030142A1 publication Critical patent/CA2030142A1/en
Application granted granted Critical
Publication of CA2030142C publication Critical patent/CA2030142C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04N9/64—Circuits for processing colour signals
    • H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
    • H04N23/88—Camera processing pipelines; Components thereof for processing colour signals for colour balance, e.g. white-balance circuits or colour temperature control

Abstract

64 regions are set on an image sensed picture of a video camera, where evaluating values r ij, b ij, and y ij are obtained by averaging color difference signals R-Y and B-Y
and luminance signal Y obtained from an image sensing signal for over 1 field period by each region. When determination is made that the difference in the evaluating values between two continuing regions do not exceed a predetermined value according to the obtained evaluating values, that is, when determination is made that continuing regions have the same color, the weighing amount of the color evaluating values of a corresponding region is reduced in producing gain control signals regarding the color difference signals. As a result, the effect of objects of the same color towards white balance adjustment is reduced.
CA002030142A 1989-11-17 1990-11-16 White balance adjusting apparatus for automatically adjusting white balance in response to color information signal obtained from image sensing device Expired - Lifetime CA2030142C (en)

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
JP30023989 1989-11-17
JP1-300239 1989-11-17
JP1337352A JP2532956B2 (en) 1989-12-26 1989-12-26 Color video camera
JP1-337352 1989-12-26
JP2047915A JP2523036B2 (en) 1990-02-28 1990-02-28 Color video camera
JP2-47915 1990-02-28
JP2-58652 1990-03-09
JP2058652A JP2532962B2 (en) 1990-03-09 1990-03-09 Color video camera
JP2-80102 1990-03-28
JP2080102A JPH0828878B2 (en) 1989-11-17 1990-03-28 White balance adjuster
JP2090902A JPH0828879B2 (en) 1990-04-05 1990-04-05 White balance adjuster
JP2-90902 1990-04-05

Publications (2)

Publication Number Publication Date
CA2030142A1 true CA2030142A1 (en) 1991-05-18
CA2030142C CA2030142C (en) 1999-02-23

Family

ID=27550294

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002030142A Expired - Lifetime CA2030142C (en) 1989-11-17 1990-11-16 White balance adjusting apparatus for automatically adjusting white balance in response to color information signal obtained from image sensing device

Country Status (6)

Country Link
US (3) US5442408A (en)
EP (3) EP0711082B1 (en)
KR (1) KR100196305B1 (en)
CA (1) CA2030142C (en)
DE (3) DE69033744T2 (en)
ES (1) ES2091784T3 (en)

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EP0519761A2 (en) * 1991-06-20 1992-12-23 Matsushita Electric Industrial Co., Ltd. Devices for judging quality of an image
EP0519761A3 (en) * 1991-06-20 1993-03-03 Matsushita Electric Industrial Co., Ltd Devices for judging quality of an image
US5448502A (en) * 1991-06-20 1995-09-05 Matsushita Electric Industrial Co., Ltd. Devices for judging image on the basis of gray world assumption, discriminating color chart, deducing light source and regulating color

Also Published As

Publication number Publication date
DE69033744T2 (en) 2002-02-28
DE69027751D1 (en) 1996-08-14
EP0711082A2 (en) 1996-05-08
EP0708569A2 (en) 1996-04-24
DE69033743T2 (en) 2002-02-07
EP0708569A3 (en) 1998-07-08
DE69033744D1 (en) 2001-07-05
US5442408A (en) 1995-08-15
ES2091784T3 (en) 1996-11-16
CA2030142C (en) 1999-02-23
DE69027751T2 (en) 1997-03-06
KR100196305B1 (en) 1999-06-15
EP0433672B1 (en) 1996-07-10
DE69033743D1 (en) 2001-07-05
EP0711082A3 (en) 1998-07-08
EP0433672A3 (en) 1992-07-08
US5555022A (en) 1996-09-10
EP0711082B1 (en) 2001-05-30
KR910011059A (en) 1991-06-29
EP0708569B1 (en) 2001-05-30
EP0433672A2 (en) 1991-06-26
US5489939A (en) 1996-02-06

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKEC Expiry (correction)

Effective date: 20121202