JPS5588469A - Coding method for picture signal including intermediate gradation level - Google Patents

Coding method for picture signal including intermediate gradation level

Info

Publication number
JPS5588469A
JPS5588469A JP16380678A JP16380678A JPS5588469A JP S5588469 A JPS5588469 A JP S5588469A JP 16380678 A JP16380678 A JP 16380678A JP 16380678 A JP16380678 A JP 16380678A JP S5588469 A JPS5588469 A JP S5588469A
Authority
JP
Japan
Prior art keywords
case
coding
decided
rll
changing point
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
JP16380678A
Other languages
Japanese (ja)
Inventor
Koichi Ejiri
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 JP16380678A priority Critical patent/JPS5588469A/en
Publication of JPS5588469A publication Critical patent/JPS5588469A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To secure the high-efficiency coding for the gradation picture by giving the run-length coding to the white part for the first line and then deciding the coordinates for the changing point picture element in the subsequent lines based on the changing point of the preceding line for combination with the gradation code to give the coding.
CONSTITUTION: Distance RLl1 of the first changing point picture element on process line L2 is counted, and then RLl1' is decided to first changing point Q1 on preceding line L1. Using the smaller one of those two distance RLl1 and RLl1' as the reference picture element, l1 is decided to carry out the coding through the prescribed code table. In case l1' is selected, the coding is given in the constitution of the RL code featuring a', kind b' of the relative address, density code c' and l1' each. In this case, the kind of the relative address of a' is decided by 10, 11 and 1 in case Q1 is preceding to R1, is next to R1 and they are identical to each other respectively. For the selection between l1 and l1', it starts at the white in case 0 comes first, the selection of l1 is decided in case 0 comes subsequently, the l1' is decided in the case of 1 and 1 respectively. In such way, and high-efficiency coding is ensured for the picture including the gradation.
COPYRIGHT: (C)1980,JPO&Japio
JP16380678A 1978-12-26 1978-12-26 Coding method for picture signal including intermediate gradation level Pending JPS5588469A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16380678A JPS5588469A (en) 1978-12-26 1978-12-26 Coding method for picture signal including intermediate gradation level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16380678A JPS5588469A (en) 1978-12-26 1978-12-26 Coding method for picture signal including intermediate gradation level

Publications (1)

Publication Number Publication Date
JPS5588469A true JPS5588469A (en) 1980-07-04

Family

ID=15781051

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16380678A Pending JPS5588469A (en) 1978-12-26 1978-12-26 Coding method for picture signal including intermediate gradation level

Country Status (1)

Country Link
JP (1) JPS5588469A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5761380A (en) * 1980-09-30 1982-04-13 Ricoh Co Ltd Picture encoding system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5761380A (en) * 1980-09-30 1982-04-13 Ricoh Co Ltd Picture encoding system
JPH0213511B2 (en) * 1980-09-30 1990-04-04 Ricoh Kk

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