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WO2008037812A3 - Image enhancement method and apparatus therefor - Google Patents

Image enhancement method and apparatus therefor Download PDF

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Publication number
WO2008037812A3
WO2008037812A3 PCT/EP2007/060396 EP2007060396W WO2008037812A3 WO 2008037812 A3 WO2008037812 A3 WO 2008037812A3 EP 2007060396 W EP2007060396 W EP 2007060396W WO 2008037812 A3 WO2008037812 A3 WO 2008037812A3
Authority
WO
WIPO (PCT)
Prior art keywords
equivalent
iso value
image enhancement
apparatus therefor
enhancement method
Prior art date
Application number
PCT/EP2007/060396
Other languages
French (fr)
Other versions
WO2008037812A2 (en
Inventor
Vyacheslav Chesnokov
Vladimir Dolzhenko
Konstantin Gorokhovskiy
Original Assignee
Apical Ltd
Vyacheslav Chesnokov
Vladimir Dolzhenko
Konstantin Gorokhovskiy
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 Apical Ltd, Vyacheslav Chesnokov, Vladimir Dolzhenko, Konstantin Gorokhovskiy filed Critical Apical Ltd
Publication of WO2008037812A2 publication Critical patent/WO2008037812A2/en
Publication of WO2008037812A3 publication Critical patent/WO2008037812A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/14—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by means of electrically scanned solid-state devices
    • H04N3/15—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by means of electrically scanned solid-state devices for picture signal generation
    • H04N3/155—Control of the image-sensor operation, e.g. image processing within the image-sensor
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/741—Circuitry for compensating brightness variation in the scene by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/76—Circuitry for compensating brightness variation in the scene by influencing the image signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Image Processing (AREA)

Abstract

An image processing method comprises controlling the gain of pixels of an input image captured at ISO value A or equivalent according to a higher applied ISO value B or equivalent. The gain of each pixel is determined by a spatially- varying image transform, which is restricted such that the maximum gain depends on a relationship between the applied ISO value B or equivalent and the ISO value A or equivalent at which the image was captured.
PCT/EP2007/060396 2006-09-29 2007-10-01 Image enhancement method and apparatus therefor WO2008037812A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0619284.3 2006-09-29
GB0619284A GB2442257A (en) 2006-09-29 2006-09-29 Spatially variable pixel gain

Publications (2)

Publication Number Publication Date
WO2008037812A2 WO2008037812A2 (en) 2008-04-03
WO2008037812A3 true WO2008037812A3 (en) 2008-05-15

Family

ID=37434958

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/060396 WO2008037812A2 (en) 2006-09-29 2007-10-01 Image enhancement method and apparatus therefor

Country Status (2)

Country Link
GB (1) GB2442257A (en)
WO (1) WO2008037812A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8355059B2 (en) * 2009-02-06 2013-01-15 Canon Kabushiki Kaisha Image capturing apparatus and control method thereof
US9077905B2 (en) 2009-02-06 2015-07-07 Canon Kabushiki Kaisha Image capturing apparatus and control method thereof
US20190052803A1 (en) * 2017-08-09 2019-02-14 Canon Kabushiki Kaisha Image processing system, imaging apparatus, image processing apparatus, control method, and storage medium

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997045809A1 (en) * 1996-05-29 1997-12-04 Science And Technology Corp. Method of improving a digital image
WO1999060524A1 (en) * 1997-05-14 1999-11-25 Cirrus Logic, Inc. System and method for enhancing dynamic range in images
WO2002089060A2 (en) * 2001-05-02 2002-11-07 Apical Limited Image enhancement methods and apparatus therefor
US20050025356A1 (en) * 2003-07-31 2005-02-03 Canon Kabushiki Kaisha Image processing method and apparatus
US20050249409A1 (en) * 2004-05-04 2005-11-10 Samsung Electronics Co., Ltd. Apparatus correcting image by luminance histogram
EP1638312A2 (en) * 2004-09-17 2006-03-22 Nikon Corporation Apparatus, program, and method for image tone transformation
US20060182360A1 (en) * 2005-02-11 2006-08-17 Samsung Electronics Co., Ltd. Method and apparatus for darker region details using image global information

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7456868B2 (en) * 2002-02-01 2008-11-25 Calderwood Richard C Digital camera with ISO pickup sensitivity adjustment
JP2006203477A (en) * 2005-01-19 2006-08-03 Fuji Photo Film Co Ltd Photographing apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997045809A1 (en) * 1996-05-29 1997-12-04 Science And Technology Corp. Method of improving a digital image
WO1999060524A1 (en) * 1997-05-14 1999-11-25 Cirrus Logic, Inc. System and method for enhancing dynamic range in images
WO2002089060A2 (en) * 2001-05-02 2002-11-07 Apical Limited Image enhancement methods and apparatus therefor
US20050025356A1 (en) * 2003-07-31 2005-02-03 Canon Kabushiki Kaisha Image processing method and apparatus
US20050249409A1 (en) * 2004-05-04 2005-11-10 Samsung Electronics Co., Ltd. Apparatus correcting image by luminance histogram
EP1638312A2 (en) * 2004-09-17 2006-03-22 Nikon Corporation Apparatus, program, and method for image tone transformation
US20060182360A1 (en) * 2005-02-11 2006-08-17 Samsung Electronics Co., Ltd. Method and apparatus for darker region details using image global information

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GAUCH J: "Image contrast enhancement via blurred weighted adaptive histogram equalization", PROCEEDINGS OF THE SPIE, SPIE, BELLINGHAM, VA, US, vol. 1606, 1991, pages 386 - 399, XP002392279, ISSN: 0277-786X *

Also Published As

Publication number Publication date
WO2008037812A2 (en) 2008-04-03
GB0619284D0 (en) 2006-11-08
GB2442257A (en) 2008-04-02

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