JPS57104370A - Shading correcting device - Google Patents

Shading correcting device

Info

Publication number
JPS57104370A
JPS57104370A JP55181071A JP18107180A JPS57104370A JP S57104370 A JPS57104370 A JP S57104370A JP 55181071 A JP55181071 A JP 55181071A JP 18107180 A JP18107180 A JP 18107180A JP S57104370 A JPS57104370 A JP S57104370A
Authority
JP
Japan
Prior art keywords
original
reflection plate
information
shading
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.)
Pending
Application number
JP55181071A
Other languages
Japanese (ja)
Inventor
Yoshiaki Kamimoto
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP55181071A priority Critical patent/JPS57104370A/en
Publication of JPS57104370A publication Critical patent/JPS57104370A/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

Landscapes

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

Abstract

PURPOSE:To achieve shading correction at AD conversion of a video signal, by obtaining a reference voltage through the use of a light outside the scanning region of original plane of a scanner. CONSTITUTION:An original 2 is located on a contact glass 1 and a reflection plate 8 is located outside the scanning region of this original. When a light source 3 scans the reflection plate 8, the reflected light from the reflection plate 8 is inputted to a line image sensor 7. In this case, an analog switch SW1 is opened with a control signal CS1 and a prescribed reference voltage Vref is given to an AD converter A/D. The output of the line image sensor 7 is transmitted to the AD converter A/D through an AMP and stored to a RAM as shading correction information in 4-bit. The video information with good fidelity can be obtained through the correction of shading of the original scanning output with this information.
JP55181071A 1980-12-20 1980-12-20 Shading correcting device Pending JPS57104370A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55181071A JPS57104370A (en) 1980-12-20 1980-12-20 Shading correcting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55181071A JPS57104370A (en) 1980-12-20 1980-12-20 Shading correcting device

Publications (1)

Publication Number Publication Date
JPS57104370A true JPS57104370A (en) 1982-06-29

Family

ID=16094286

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55181071A Pending JPS57104370A (en) 1980-12-20 1980-12-20 Shading correcting device

Country Status (1)

Country Link
JP (1) JPS57104370A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60242772A (en) * 1984-05-17 1985-12-02 Fuji Photo Film Co Ltd Method for correcting picture read sensitivity distribution
JPS61121667A (en) * 1984-11-19 1986-06-09 Canon Inc Picture reading device
JPS61256865A (en) * 1985-05-09 1986-11-14 Ricoh Co Ltd Processing method for digital picture
JPS6387072A (en) * 1986-09-30 1988-04-18 Nec Home Electronics Ltd Picture reading device
EP0407155A2 (en) * 1989-07-07 1991-01-09 Konica Corporation Image reading apparatus
US5267055A (en) * 1988-05-11 1993-11-30 Canon Kabushiki Kaisha Image signal processing apparatus
US6301019B1 (en) * 1994-04-22 2001-10-09 Fujitsu Limited Image reading apparatus, image reading method, whiteness level correcting method and whiteness level generating method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50126132A (en) * 1974-03-23 1975-10-03
JPS5317034A (en) * 1976-07-30 1978-02-16 Sharp Corp Image sensor output correcting system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50126132A (en) * 1974-03-23 1975-10-03
JPS5317034A (en) * 1976-07-30 1978-02-16 Sharp Corp Image sensor output correcting system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60242772A (en) * 1984-05-17 1985-12-02 Fuji Photo Film Co Ltd Method for correcting picture read sensitivity distribution
JPH058620B2 (en) * 1984-05-17 1993-02-02 Fuji Photo Film Co Ltd
JPS61121667A (en) * 1984-11-19 1986-06-09 Canon Inc Picture reading device
JPS61256865A (en) * 1985-05-09 1986-11-14 Ricoh Co Ltd Processing method for digital picture
JPS6387072A (en) * 1986-09-30 1988-04-18 Nec Home Electronics Ltd Picture reading device
US5267055A (en) * 1988-05-11 1993-11-30 Canon Kabushiki Kaisha Image signal processing apparatus
EP0407155A2 (en) * 1989-07-07 1991-01-09 Konica Corporation Image reading apparatus
US5111311A (en) * 1989-07-07 1992-05-05 Konica Corporation Image reading apparatus with black level correction
US6301019B1 (en) * 1994-04-22 2001-10-09 Fujitsu Limited Image reading apparatus, image reading method, whiteness level correcting method and whiteness level generating method

Similar Documents

Publication Publication Date Title
CA2134277A1 (en) Video format conversions systems --
AU551349B2 (en) Conversion of video signals to photographic prints
JPS5748860A (en) Picture synthesizer
JPS57104370A (en) Shading correcting device
CA2034223A1 (en) Image data processing apparatus
AU553635B2 (en) Document scanners
AU4577179A (en) Method for converting a video signal into a black/white signal
JPS5548976A (en) Photoelectric conversion element
JPS55108080A (en) Photo electric conversion unit
TW365666B (en) Image reading device
JPS5620383A (en) Original reader
JPS57130181A (en) Optical character scanner
EP0394999A3 (en) Shading distortion compensating structure of a light convergence reading scanner
JPS5442927A (en) Pickup device
JPS60248066A (en) Quantity-of-light adjusting device for facsimile equipment
JPS574659A (en) Picture signal correcting device
TW357323B (en) Image processing device capable of providing high quality image data without deterioration of the image quality
CN2342418Y (en) Infrared light source scanning device
JPS57143682A (en) Optical character reader
JPS5476008A (en) Shading correcting device
SU120409A1 (en) Method of making contact rasters
JPS5725776A (en) Processing system of picture signal
JPS6481471A (en) Picture information reader
JPS5750173A (en) Transmission signal processing system
JPS53128219A (en) Electronic zooming system