JPS5595480A - Gradation picture processing system - Google Patents

Gradation picture processing system

Info

Publication number
JPS5595480A
JPS5595480A JP123779A JP123779A JPS5595480A JP S5595480 A JPS5595480 A JP S5595480A JP 123779 A JP123779 A JP 123779A JP 123779 A JP123779 A JP 123779A JP S5595480 A JPS5595480 A JP S5595480A
Authority
JP
Japan
Prior art keywords
gradation value
gradation
reproduction
conversion difference
difference
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
JP123779A
Other languages
Japanese (ja)
Other versions
JPS6026346B2 (en
Inventor
Yoshiharu Okino
Kazuo Nakano
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP54001237A priority Critical patent/JPS6026346B2/en
Publication of JPS5595480A publication Critical patent/JPS5595480A/en
Publication of JPS6026346B2 publication Critical patent/JPS6026346B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To increase transmission efficiency by limiting the amplitude of reproduction gradation on a transmission side within a certain fixed range.
CONSTITUTION: Subtracter 20 calculates a difference between gradation value Sa of an input picture signal and reproduction gradation value Sj of a preceding picture element to output gradation value Sk. Differential converting ROM21 having tapered-dode quantization characteristics converts gradation value Sk into conversion difference Sl. Adder 22 obtains the sum of conversion difference Sl and gradation value Sj to output reproduction gradation value Sm. Clamping circuit 23 clamps gradation value Sm, when less than 0 or not less than 15, to a gradation value of 0 or 15 within the range of gradation value Sa to make reproduction gradation value Sn approximate to gradation value Sa. This gradation value Sn is stored in gradation memory 24 as reproduction gradation Sj so as to forecast a picture element of a following line. On the other hand, conversion difference Sl is inputted to coder circuit 25 and converted there into transmission code So.
COPYRIGHT: (C)1980,JPO&Japio
JP54001237A 1979-01-12 1979-01-12 Gradation image processing method Expired JPS6026346B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54001237A JPS6026346B2 (en) 1979-01-12 1979-01-12 Gradation image processing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54001237A JPS6026346B2 (en) 1979-01-12 1979-01-12 Gradation image processing method

Publications (2)

Publication Number Publication Date
JPS5595480A true JPS5595480A (en) 1980-07-19
JPS6026346B2 JPS6026346B2 (en) 1985-06-22

Family

ID=11495848

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54001237A Expired JPS6026346B2 (en) 1979-01-12 1979-01-12 Gradation image processing method

Country Status (1)

Country Link
JP (1) JPS6026346B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6222343U (en) * 1985-07-26 1987-02-10

Also Published As

Publication number Publication date
JPS6026346B2 (en) 1985-06-22

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