JPS57124969A - Noise rejecting method - Google Patents

Noise rejecting method

Info

Publication number
JPS57124969A
JPS57124969A JP56009899A JP989981A JPS57124969A JP S57124969 A JPS57124969 A JP S57124969A JP 56009899 A JP56009899 A JP 56009899A JP 989981 A JP989981 A JP 989981A JP S57124969 A JPS57124969 A JP S57124969A
Authority
JP
Japan
Prior art keywords
circuit
video
output
average level
elements
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
JP56009899A
Other languages
Japanese (ja)
Other versions
JPH0224067B2 (en
Inventor
Hirokawa Hayashi
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 JP56009899A priority Critical patent/JPS57124969A/en
Publication of JPS57124969A publication Critical patent/JPS57124969A/en
Publication of JPH0224067B2 publication Critical patent/JPH0224067B2/ja
Granted 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
    • H04N1/409—Edge or detail enhancement; Noise or error suppression

Landscapes

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

Abstract

PURPOSE:To reject noise such as background dirt from an input picture, by detecting an average level of a video element density of the input picture and eliminating the video elements of a density less than this average level. CONSTITUTION:An analog input video signal (a) read in by a scanner is inputted to a preprocessing circuit 10 to detect an average level of the video element density and the video elements of a density less than the average level are rejected and the result is applied to a skelton video pickup circuit 20. Further, the output of the circuit 10 is given to a profile video pickup circuit 40 via a differentiation binary circuit 30 and it is processed together with the output of the circuit 20. The arrangement of video elements is corrected at a correction circuit 50 and open profile line is corrected at a correction circuit 60, and the result is synthesized with an output of the circuit 20 at a video synthesis processing circuit 70. Thus, a binary video output where noise such as background dirt of a document is rejected is obtained.
JP56009899A 1981-01-26 1981-01-26 Noise rejecting method Granted JPS57124969A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56009899A JPS57124969A (en) 1981-01-26 1981-01-26 Noise rejecting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56009899A JPS57124969A (en) 1981-01-26 1981-01-26 Noise rejecting method

Publications (2)

Publication Number Publication Date
JPS57124969A true JPS57124969A (en) 1982-08-04
JPH0224067B2 JPH0224067B2 (en) 1990-05-28

Family

ID=11732957

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56009899A Granted JPS57124969A (en) 1981-01-26 1981-01-26 Noise rejecting method

Country Status (1)

Country Link
JP (1) JPS57124969A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02284272A (en) * 1989-04-26 1990-11-21 Sharp Corp Character image data generating system
US5799108A (en) * 1994-10-20 1998-08-25 Sharp Kabushiki Kaisha Image decorative processing apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583372A (en) * 1978-12-20 1980-06-23 Toshiba Corp Character read system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583372A (en) * 1978-12-20 1980-06-23 Toshiba Corp Character read system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02284272A (en) * 1989-04-26 1990-11-21 Sharp Corp Character image data generating system
US5799108A (en) * 1994-10-20 1998-08-25 Sharp Kabushiki Kaisha Image decorative processing apparatus

Also Published As

Publication number Publication date
JPH0224067B2 (en) 1990-05-28

Similar Documents

Publication Publication Date Title
US4850029A (en) Adaptive threshold circuit for image processing
KR890005512A (en) Method and apparatus for detecting and evaluating surface cracks of workpieces
US4549213A (en) System for reduction of noise in a television signal
US4615598A (en) Method of extracting automatic-focusing information
JPS57124969A (en) Noise rejecting method
JPS6484147A (en) Internal quality inspecting method for metal piece
KR870000456B1 (en) Apparatus of detecting shape
KR890011446A (en) Adaptive Y / C Separation Circuit Using Horizontal and Vertical Correlation in Television Receivers
JPS5753179A (en) Picture processing
JPS5725076A (en) Method for binary-coding of video signal
US4414582A (en) Multiple line processing of video signals in a scanning type document reader
JPS57163805A (en) Method and device for inspecting thickness of tablet
JPS57159177A (en) Signal processing circuit for television receiver
JPS5742275A (en) Dark current correcting method for ccd sensor
CA2015162A1 (en) Method of and apparatus for increasing the processing speed in the scanning inspection of circuit boards and other objects
JPH0247974A (en) Picture signal binarizing circuit
JPS57185770A (en) Noise rejecting method
JPS57125577A (en) Binarized tonal processing method for analog video signal
JPS6258443B2 (en)
JPS57133342A (en) Detector for contamination
JPH0273473A (en) Inspecting method
JPS6482276A (en) Image processor
JPS57125584A (en) Profile emphasizing circuit
JPS643783A (en) Picture signal processor
JPS5738068A (en) Video processing system