FR2293011A1 - Image processor normalising and enhancing image contrast - uses programme statistical pipe-line processor to calculate new brightness for each point in image - Google Patents

Image processor normalising and enhancing image contrast - uses programme statistical pipe-line processor to calculate new brightness for each point in image

Info

Publication number
FR2293011A1
FR2293011A1 FR7431174A FR7431174A FR2293011A1 FR 2293011 A1 FR2293011 A1 FR 2293011A1 FR 7431174 A FR7431174 A FR 7431174A FR 7431174 A FR7431174 A FR 7431174A FR 2293011 A1 FR2293011 A1 FR 2293011A1
Authority
FR
France
Prior art keywords
image
processor
point
pipe
statistical
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
FR7431174A
Other languages
French (fr)
Other versions
FR2293011B1 (en
Inventor
Claude Roche
Jean-Paul Caillou
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.)
Etat Francais
Original Assignee
Etat Francais
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 Etat Francais filed Critical Etat Francais
Priority to FR7431174A priority Critical patent/FR2293011A1/en
Publication of FR2293011A1 publication Critical patent/FR2293011A1/en
Application granted granted Critical
Publication of FR2293011B1 publication Critical patent/FR2293011B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/20—Image enhancement or restoration using local operators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H04N1/4072—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original
    • H04N1/4074—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original using histograms

Landscapes

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

Abstract

The image processor normalises and enhances the contrast of an image using a pipe-line processor programmed to perform a statistical function on each image poit to yield a new value. For each image point the mean amplitude and the variance of the immediately neighbouring points are calculated in two processors. A histogram of mean amplitudes is stored, as is a histogram of amplitude variance, above a threshold. For each image point these histograms are combined in a statistical function whose form is determined by a read-only-memory. From the results of this process a look up table is derived which is used to transform each incoming image point into an enhanced point.
FR7431174A 1974-09-16 1974-09-16 Image processor normalising and enhancing image contrast - uses programme statistical pipe-line processor to calculate new brightness for each point in image Granted FR2293011A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7431174A FR2293011A1 (en) 1974-09-16 1974-09-16 Image processor normalising and enhancing image contrast - uses programme statistical pipe-line processor to calculate new brightness for each point in image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7431174A FR2293011A1 (en) 1974-09-16 1974-09-16 Image processor normalising and enhancing image contrast - uses programme statistical pipe-line processor to calculate new brightness for each point in image

Publications (2)

Publication Number Publication Date
FR2293011A1 true FR2293011A1 (en) 1976-06-25
FR2293011B1 FR2293011B1 (en) 1977-11-04

Family

ID=9143102

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7431174A Granted FR2293011A1 (en) 1974-09-16 1974-09-16 Image processor normalising and enhancing image contrast - uses programme statistical pipe-line processor to calculate new brightness for each point in image

Country Status (1)

Country Link
FR (1) FR2293011A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2452836A1 (en) * 1979-03-29 1980-10-24 Philips Nv SYSTEM FOR MODIFYING REAL-TIME HISTOGRAM
EP0249922A2 (en) * 1986-06-16 1987-12-23 Kabushiki Kaisha Toshiba Method for realizing high-speed statistic operation processing and image data processing apparatus for embodying the method
EP0342549A2 (en) * 1988-05-16 1989-11-23 Ezel Inc. Image processing method
EP0366099A2 (en) * 1988-10-24 1990-05-02 Hughes Aircraft Company Computationally efficient technique of image contrast enhancement
EP0383269A2 (en) * 1989-02-14 1990-08-22 Adler Research Associates Regionally adaptive imaging techniques
FR2647918A1 (en) * 1989-06-01 1990-12-07 France Etat Armement Method of image processing by analysis of scale contrast
EP0639818A1 (en) * 1993-08-16 1995-02-22 Agfa-Gevaert N.V. Method of monitoring the sensitivity of a system for reading a radiation image stored in a photostimulable phosphor screen
EP0785668A1 (en) * 1996-01-18 1997-07-23 Konica Corporation Method and apparatus for analyzing and correcting the gradation of an original
EP0848545A2 (en) * 1996-12-10 1998-06-17 Eastman Kodak Company Method for estimating and adjusting digital image contrast

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2452836A1 (en) * 1979-03-29 1980-10-24 Philips Nv SYSTEM FOR MODIFYING REAL-TIME HISTOGRAM
EP0249922A3 (en) * 1986-06-16 1991-04-24 Kabushiki Kaisha Toshiba Method for realizing high-speed statistic operation processing and image data processing apparatus for embodying the method
EP0249922A2 (en) * 1986-06-16 1987-12-23 Kabushiki Kaisha Toshiba Method for realizing high-speed statistic operation processing and image data processing apparatus for embodying the method
EP0342549A2 (en) * 1988-05-16 1989-11-23 Ezel Inc. Image processing method
EP0342549A3 (en) * 1988-05-16 1991-10-09 Ezel Inc. Image processing method
JPH02163882A (en) * 1988-10-24 1990-06-25 Hughes Aircraft Co Method effective for calculation for
EP0366099A3 (en) * 1988-10-24 1991-01-23 Hughes Aircraft Company Computationally efficient technique of image contrast enhancement
EP0366099A2 (en) * 1988-10-24 1990-05-02 Hughes Aircraft Company Computationally efficient technique of image contrast enhancement
EP0383269A2 (en) * 1989-02-14 1990-08-22 Adler Research Associates Regionally adaptive imaging techniques
EP0383269A3 (en) * 1989-02-14 1992-02-26 Adler Research Associates Regionally adaptive imaging techniques
FR2647918A1 (en) * 1989-06-01 1990-12-07 France Etat Armement Method of image processing by analysis of scale contrast
EP0639818A1 (en) * 1993-08-16 1995-02-22 Agfa-Gevaert N.V. Method of monitoring the sensitivity of a system for reading a radiation image stored in a photostimulable phosphor screen
US5684888A (en) * 1993-08-16 1997-11-04 Agfa-Gevaert Method of monitoring the sensitivity of a system for reading a radiation image stored in a photostimulable phosphor screen
EP0785668A1 (en) * 1996-01-18 1997-07-23 Konica Corporation Method and apparatus for analyzing and correcting the gradation of an original
US5949962A (en) * 1996-01-18 1999-09-07 Konica Corporation Method for calculating color correction conditions, a method for determining an exposure amount for printing, an image processing apparatus, a printing exposure apparatus and a storage medium
EP0848545A2 (en) * 1996-12-10 1998-06-17 Eastman Kodak Company Method for estimating and adjusting digital image contrast
EP0848545A3 (en) * 1996-12-10 2000-08-02 Eastman Kodak Company Method for estimating and adjusting digital image contrast

Also Published As

Publication number Publication date
FR2293011B1 (en) 1977-11-04

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