JPS5726966A - Binary threshold value setting method - Google Patents

Binary threshold value setting method

Info

Publication number
JPS5726966A
JPS5726966A JP10211380A JP10211380A JPS5726966A JP S5726966 A JPS5726966 A JP S5726966A JP 10211380 A JP10211380 A JP 10211380A JP 10211380 A JP10211380 A JP 10211380A JP S5726966 A JPS5726966 A JP S5726966A
Authority
JP
Japan
Prior art keywords
ratio
threshold value
density
circumference
section
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
JP10211380A
Other languages
Japanese (ja)
Inventor
Akira Sakurai
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 JP10211380A priority Critical patent/JPS5726966A/en
Publication of JPS5726966A publication Critical patent/JPS5726966A/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
    • H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original

Landscapes

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

Abstract

PURPOSE:To set optimum threshold value so that excellent binarized picture can be obtained independently of lower or higher background level, by using the ratio of circumference length to density, in a character picture. CONSTITUTION:Density information from a cyclic register 6 storing density information of picture is binarized at a binarizing section 3, and the result is applied to the circumference length ratio (length of circumference/number of black video elements) operation section 2, where binarized video elements are read in through a buffer memory 7 to calculate the length of circumference and the circumference length ratio. When the ratio for a certain density is finished to obtain, the ratio is applied to a threshold value operation section 4 and the binarizing section 3, and the same is made with different density. The section 4 receives the threshold value and density this time together with the ratio from the section 2, to calculate an optimum threshold value from the relation between the circumference length ratio and the density.
JP10211380A 1980-07-25 1980-07-25 Binary threshold value setting method Pending JPS5726966A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10211380A JPS5726966A (en) 1980-07-25 1980-07-25 Binary threshold value setting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10211380A JPS5726966A (en) 1980-07-25 1980-07-25 Binary threshold value setting method

Publications (1)

Publication Number Publication Date
JPS5726966A true JPS5726966A (en) 1982-02-13

Family

ID=14318742

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10211380A Pending JPS5726966A (en) 1980-07-25 1980-07-25 Binary threshold value setting method

Country Status (1)

Country Link
JP (1) JPS5726966A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03121907A (en) * 1989-10-05 1991-05-23 Sumitomo Rubber Ind Ltd Heavy load tire
JPH03169715A (en) * 1989-11-30 1991-07-23 Sumitomo Rubber Ind Ltd Radial tire for heavy load
JPH03178806A (en) * 1989-12-07 1991-08-02 Sumitomo Rubber Ind Ltd Radial tire for heavy load
JPH03189209A (en) * 1989-12-19 1991-08-19 Sumitomo Rubber Ind Ltd Heavy duty radial tire

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03121907A (en) * 1989-10-05 1991-05-23 Sumitomo Rubber Ind Ltd Heavy load tire
JPH03169715A (en) * 1989-11-30 1991-07-23 Sumitomo Rubber Ind Ltd Radial tire for heavy load
JPH03178806A (en) * 1989-12-07 1991-08-02 Sumitomo Rubber Ind Ltd Radial tire for heavy load
JPH03189209A (en) * 1989-12-19 1991-08-19 Sumitomo Rubber Ind Ltd Heavy duty radial tire

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