JPS5795758A - Picture signal processor - Google Patents

Picture signal processor

Info

Publication number
JPS5795758A
JPS5795758A JP55171879A JP17187980A JPS5795758A JP S5795758 A JPS5795758 A JP S5795758A JP 55171879 A JP55171879 A JP 55171879A JP 17187980 A JP17187980 A JP 17187980A JP S5795758 A JPS5795758 A JP S5795758A
Authority
JP
Japan
Prior art keywords
picture signal
digital
analog
picture
circuit
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.)
Pending
Application number
JP55171879A
Other languages
Japanese (ja)
Inventor
Yoshikazu Yokomizo
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP55171879A priority Critical patent/JPS5795758A/en
Priority to US06/326,269 priority patent/US4589034A/en
Priority to DE3153280A priority patent/DE3153280C2/de
Priority to DE3148129A priority patent/DE3148129C2/en
Priority to GB8136687A priority patent/GB2091967B/en
Publication of JPS5795758A publication Critical patent/JPS5795758A/en
Priority to GB08420007A priority patent/GB2142802B/en
Priority to US06/789,839 priority patent/US4748677A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head

Abstract

PURPOSE:To enable the control up to an accuracy of a lower rank 1 bit, by converging a picture digital value to an analog picture signal of a specified level to data, in a picture signal processor converting analog picture signals into digital signals. CONSTITUTION:A set value of white level peak of a picture signal to be converged is stored in a preset switch 63, and in an automatic gain control AGC circuit, a closed loop comprises an analog-to-digital conversion circuit 52, comparison circuit 62, digital processing circuit 64, digital-to-analog conversion circuit 66, and multiplier 51. Thus, picture digital values b0-b5 converting an input analog picture signal (c) of a specified level can be converged into data of the set value of a preset switch 63, and the input analog picture signal (c) can be amplified stably at all times.
JP55171879A 1980-12-05 1980-12-05 Picture signal processor Pending JPS5795758A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP55171879A JPS5795758A (en) 1980-12-05 1980-12-05 Picture signal processor
US06/326,269 US4589034A (en) 1980-12-05 1981-12-01 Image processing apparatus
DE3153280A DE3153280C2 (en) 1980-12-05 1981-12-04
DE3148129A DE3148129C2 (en) 1980-12-05 1981-12-04 Image processing device
GB8136687A GB2091967B (en) 1980-12-05 1981-12-04 Facsimile image processor
GB08420007A GB2142802B (en) 1980-12-05 1984-08-06 Facsimile image processor
US06/789,839 US4748677A (en) 1980-12-05 1985-10-21 Image processing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55171879A JPS5795758A (en) 1980-12-05 1980-12-05 Picture signal processor

Publications (1)

Publication Number Publication Date
JPS5795758A true JPS5795758A (en) 1982-06-14

Family

ID=15931480

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55171879A Pending JPS5795758A (en) 1980-12-05 1980-12-05 Picture signal processor

Country Status (1)

Country Link
JP (1) JPS5795758A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156070A (en) * 1983-02-25 1984-09-05 Canon Inc Picture processing device
JPS59202769A (en) * 1983-05-04 1984-11-16 Fuji Xerox Co Ltd Automatic adjusting circuit of background level
JPS6027272A (en) * 1983-07-25 1985-02-12 Canon Inc Picture information reader
JPS61123361A (en) * 1984-11-20 1986-06-11 Matsushita Electric Ind Co Ltd Image read device
JPS61277269A (en) * 1985-05-31 1986-12-08 Matsushita Electric Ind Co Ltd Color picture reader
JPS61295762A (en) * 1985-06-24 1986-12-26 Photo Composing Mach Mfg Co Ltd Image reading system
JPS62189872A (en) * 1986-02-17 1987-08-19 Murata Mach Ltd Picture signal correcting device for facsimile equipment
JPS62268269A (en) * 1986-05-16 1987-11-20 Fuji Xerox Co Ltd Output correction circuit for image sensor
JPS6326160A (en) * 1986-07-18 1988-02-03 Shinko Electric Co Ltd Picture reader
JPS63250276A (en) * 1987-04-06 1988-10-18 Matsushita Graphic Commun Syst Inc Image signal processor
JPS63290465A (en) * 1987-05-22 1988-11-28 Matsushita Graphic Commun Syst Inc Picture reader
JPH01162074A (en) * 1987-12-18 1989-06-26 Murata Mach Ltd Automatic gain control method in facsimile
JPH01320869A (en) * 1988-06-22 1989-12-26 Matsushita Electric Ind Co Ltd Picture processing device
JPH0531461U (en) * 1992-08-05 1993-04-23 村田機械株式会社 Image signal correction device for faximili

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156070A (en) * 1983-02-25 1984-09-05 Canon Inc Picture processing device
JPS59202769A (en) * 1983-05-04 1984-11-16 Fuji Xerox Co Ltd Automatic adjusting circuit of background level
JPS6027272A (en) * 1983-07-25 1985-02-12 Canon Inc Picture information reader
JPS61123361A (en) * 1984-11-20 1986-06-11 Matsushita Electric Ind Co Ltd Image read device
JPS61277269A (en) * 1985-05-31 1986-12-08 Matsushita Electric Ind Co Ltd Color picture reader
JPS61295762A (en) * 1985-06-24 1986-12-26 Photo Composing Mach Mfg Co Ltd Image reading system
JPS62189872A (en) * 1986-02-17 1987-08-19 Murata Mach Ltd Picture signal correcting device for facsimile equipment
JPS62268269A (en) * 1986-05-16 1987-11-20 Fuji Xerox Co Ltd Output correction circuit for image sensor
JPS6326160A (en) * 1986-07-18 1988-02-03 Shinko Electric Co Ltd Picture reader
JPS63250276A (en) * 1987-04-06 1988-10-18 Matsushita Graphic Commun Syst Inc Image signal processor
JPS63290465A (en) * 1987-05-22 1988-11-28 Matsushita Graphic Commun Syst Inc Picture reader
JPH01162074A (en) * 1987-12-18 1989-06-26 Murata Mach Ltd Automatic gain control method in facsimile
JPH0578229B2 (en) * 1987-12-18 1993-10-28 Murata Machinery Ltd
JPH01320869A (en) * 1988-06-22 1989-12-26 Matsushita Electric Ind Co Ltd Picture processing device
JPH0531461U (en) * 1992-08-05 1993-04-23 村田機械株式会社 Image signal correction device for faximili

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