GB1526801A - Compensating interference from solid state image sensing devices - Google Patents

Compensating interference from solid state image sensing devices

Info

Publication number
GB1526801A
GB1526801A GB2194/75A GB219475A GB1526801A GB 1526801 A GB1526801 A GB 1526801A GB 2194/75 A GB2194/75 A GB 2194/75A GB 219475 A GB219475 A GB 219475A GB 1526801 A GB1526801 A GB 1526801A
Authority
GB
United Kingdom
Prior art keywords
signal
output
subtractor
store
converter
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.)
Expired
Application number
GB2194/75A
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.)
British Broadcasting Corp
Original Assignee
British Broadcasting Corp
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 British Broadcasting Corp filed Critical British Broadcasting Corp
Priority to GB2194/75A priority Critical patent/GB1526801A/en
Publication of GB1526801A publication Critical patent/GB1526801A/en
Expired 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
    • H04N25/63—Noise processing, e.g. detecting, correcting, reducing or removing noise applied to dark current
    • H04N25/633—Noise processing, e.g. detecting, correcting, reducing or removing noise applied to dark current by using optical black pixels

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

1526801 Television BRITISH BROADCASTING CORP 8 Jan 1976 [17 Jan 1975] 2194/75 Heading H4F A method of compensating for undesired signal components in the output of a solid state image sensing device 10, comprises shielding said device from all incident light and storing in a store 20 the output signal obtained by scanning the device to provide a first stored signal, subjecting device 10 to a maximum illumination from a lamp 44, subtracting the first stored signal from the output signal obtained by scanning the device, and storing in a store 30 a second stored signal dependent upon the resultant of the subtraction, the output signal from the device, in normal use, having the first stored signal subtracted therefrom and being modified by the signal from store 30 to produce a signal representative of the resultant of the subtraction divided by the value represented by the second stored signal. The method therefore reduces the effects of a first signal component caused by variations in dark current or breakthrough from clock pulses and which is present in the output of the device 10, and of a second signal component caused by sensitivity variations or by varying transfer efficiencies and which is a linear function of signal level. The signal from device 10, which consists of an array of photosensitive cells, is passed through an analogue-to-digital converter 16 to a subtractor 24, which also receives the signal from store 20. The subtractor 24 is coupled to a logarithmic converter 28 and to a subtractor 34, which also receives the signal from store 30. An antilogarithmic converter 36 is connected to the output of subtractor 34 and has its own output connected to a digital-to-analogue converter 38. A dividing circuit may be used in place of subtractor 34 and converters 28, 36. The stores may apply the average of several scans to subtractors 24, 34 to reduce the effect of random noise in the output of device 10. A sequencer 42 connected to scanning circuits 12 of device 10, to lamp 44, and to switches 22, 32 for stores 20, 30 respectively may control the procedure for storing the desired signals.
GB2194/75A 1976-01-08 1976-01-08 Compensating interference from solid state image sensing devices Expired GB1526801A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2194/75A GB1526801A (en) 1976-01-08 1976-01-08 Compensating interference from solid state image sensing devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2194/75A GB1526801A (en) 1976-01-08 1976-01-08 Compensating interference from solid state image sensing devices

Publications (1)

Publication Number Publication Date
GB1526801A true GB1526801A (en) 1978-10-04

Family

ID=9735248

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2194/75A Expired GB1526801A (en) 1976-01-08 1976-01-08 Compensating interference from solid state image sensing devices

Country Status (1)

Country Link
GB (1) GB1526801A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0016629A2 (en) * 1979-03-26 1980-10-01 Xerox Corporation System and method for restoring image signal levels and setting signal gain for image-viewing devices
EP0024470A2 (en) * 1979-08-21 1981-03-11 Ball Corporation Method and apparatus for compensating for sensitivity variations in an image sensor
US4343021A (en) 1979-08-21 1982-08-03 Ball Corporation Image sensor sensitivity variation compensator
FR2525844A1 (en) * 1982-04-27 1983-10-28 Thomson Csf METHOD AND APPARATUS FOR CORRECTING TELEVISION VIEWING SIGNALS
GB2126825A (en) * 1982-09-09 1984-03-28 Link Electronics Ltd Black shading correction
GB2126829A (en) * 1982-09-09 1984-03-28 Link Electronics Ltd Image correction
GB2149260A (en) * 1983-11-04 1985-06-05 Marconi Avionics Image processing
DE3507933A1 (en) * 1984-03-08 1985-09-19 Dainippon Screen Manufacturing Co., Ltd., Kyoto IMAGE RECORDING DEVICE
GB2163620A (en) * 1984-08-24 1986-02-26 Dainippon Screen Mfg Output correction in image reproduction
DE3636658A1 (en) * 1985-10-29 1987-04-30 Canon Kk DEVICE FOR PROCESSING COLOR IMAGE INFORMATION
EP0396045A2 (en) * 1989-05-03 1990-11-07 Robert Bosch Gmbh Image pickup device
EP0748113A2 (en) * 1995-06-05 1996-12-11 Eastman Kodak Company Smear correction of CCD imager using active pixels

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0016629A2 (en) * 1979-03-26 1980-10-01 Xerox Corporation System and method for restoring image signal levels and setting signal gain for image-viewing devices
EP0016629A3 (en) * 1979-03-26 1980-10-15 Xerox Corporation System and method for restoring image signal levels and setting signal gain for image-viewing devices
EP0024470A2 (en) * 1979-08-21 1981-03-11 Ball Corporation Method and apparatus for compensating for sensitivity variations in an image sensor
EP0024470A3 (en) * 1979-08-21 1981-05-06 Ball Corporation Method and apparatus for compensating for sensitivity variations in an image sensor
US4343021A (en) 1979-08-21 1982-08-03 Ball Corporation Image sensor sensitivity variation compensator
FR2525844A1 (en) * 1982-04-27 1983-10-28 Thomson Csf METHOD AND APPARATUS FOR CORRECTING TELEVISION VIEWING SIGNALS
EP0094851A1 (en) * 1982-04-27 1983-11-23 Thomson-Csf Correction apparatus for television image pick-up signals
GB2126825A (en) * 1982-09-09 1984-03-28 Link Electronics Ltd Black shading correction
GB2126829A (en) * 1982-09-09 1984-03-28 Link Electronics Ltd Image correction
GB2149260A (en) * 1983-11-04 1985-06-05 Marconi Avionics Image processing
DE3507933A1 (en) * 1984-03-08 1985-09-19 Dainippon Screen Manufacturing Co., Ltd., Kyoto IMAGE RECORDING DEVICE
GB2163620A (en) * 1984-08-24 1986-02-26 Dainippon Screen Mfg Output correction in image reproduction
DE3527237A1 (en) * 1984-08-24 1986-03-06 Dainippon Screen Mfg. Co., Ltd., Kyoto METHOD AND DEVICE FOR CORRECTING THE OUTPUT SIGNAL OF AN IMAGE SCANNER
US4660082A (en) * 1984-08-24 1987-04-21 Dainippon Screen Mfg. Co., Ltd. Output correction in image reproduction
DE3636658A1 (en) * 1985-10-29 1987-04-30 Canon Kk DEVICE FOR PROCESSING COLOR IMAGE INFORMATION
US4907076A (en) * 1985-10-29 1990-03-06 Canon Kabushiki Kaisha Color balance processing apparatus wherein color component signals are corrected through comparison with a reference value
EP0396045A2 (en) * 1989-05-03 1990-11-07 Robert Bosch Gmbh Image pickup device
EP0396045A3 (en) * 1989-05-03 1992-03-04 Robert Bosch Gmbh Image pickup device
EP0748113A2 (en) * 1995-06-05 1996-12-11 Eastman Kodak Company Smear correction of CCD imager using active pixels
EP0748113A3 (en) * 1995-06-05 1999-04-14 Eastman Kodak Company Smear correction of CCD imager using active pixels

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee