CA2064721A1 - Image correction circuit - Google Patents

Image correction circuit

Info

Publication number
CA2064721A1
CA2064721A1 CA2064721A CA2064721A CA2064721A1 CA 2064721 A1 CA2064721 A1 CA 2064721A1 CA 2064721 A CA2064721 A CA 2064721A CA 2064721 A CA2064721 A CA 2064721A CA 2064721 A1 CA2064721 A1 CA 2064721A1
Authority
CA
Canada
Prior art keywords
correction circuit
unit
image correction
correction values
digital
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
CA2064721A
Other languages
French (fr)
Other versions
CA2064721C (en
Inventor
James Scott Houchin
Kenneth Alan Parulski
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.)
Eastman Kodak Co
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2064721A1 publication Critical patent/CA2064721A1/en
Application granted granted Critical
Publication of CA2064721C publication Critical patent/CA2064721C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
    • H04N25/61—Noise processing, e.g. detecting, correcting, reducing or removing noise the noise originating only from the lens unit, e.g. flare, shading, vignetting or "cos4"
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
    • H04N25/67—Noise processing, e.g. detecting, correcting, reducing or removing noise applied to fixed-pattern noise, e.g. non-uniformity of response
    • H04N25/671—Noise processing, e.g. detecting, correcting, reducing or removing noise applied to fixed-pattern noise, e.g. non-uniformity of response for non-uniformity detection or correction
    • H04N25/673—Noise processing, e.g. detecting, correcting, reducing or removing noise applied to fixed-pattern noise, e.g. non-uniformity of response for non-uniformity detection or correction by using reference sources

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Facsimile Heads (AREA)

Abstract

An apparatus for reading and correcting an image including: a sensor which receives light and converts it to electrical signals; a digitizing unit to convert the analog image signal to a digital signal; a calibration unit to capture calibration data for each pixel under known illumination conditions and to produce individual correction values for each pixel and a correction unit comprised of a look-up table addressed by both the digital image signal and the correction values which corrects the digital image data.
CA002064721A 1990-07-31 1991-07-24 Image correction circuit Expired - Fee Related CA2064721C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/561,437 US5047861A (en) 1990-07-31 1990-07-31 Method and apparatus for pixel non-uniformity correction
US561,437 1990-07-31

Publications (2)

Publication Number Publication Date
CA2064721A1 true CA2064721A1 (en) 1992-02-01
CA2064721C CA2064721C (en) 1997-10-14

Family

ID=24241974

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002064721A Expired - Fee Related CA2064721C (en) 1990-07-31 1991-07-24 Image correction circuit

Country Status (6)

Country Link
US (1) US5047861A (en)
EP (1) EP0495045B1 (en)
JP (1) JPH05501793A (en)
CA (1) CA2064721C (en)
DE (1) DE69125472T2 (en)
WO (1) WO1992003009A1 (en)

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Also Published As

Publication number Publication date
WO1992003009A1 (en) 1992-02-20
CA2064721C (en) 1997-10-14
JPH05501793A (en) 1993-04-02
EP0495045A1 (en) 1992-07-22
EP0495045B1 (en) 1997-04-02
US5047861A (en) 1991-09-10
DE69125472T2 (en) 1997-11-06
DE69125472D1 (en) 1997-05-07

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