JPS6424687A - Image encoder - Google Patents

Image encoder

Info

Publication number
JPS6424687A
JPS6424687A JP62181520A JP18152087A JPS6424687A JP S6424687 A JPS6424687 A JP S6424687A JP 62181520 A JP62181520 A JP 62181520A JP 18152087 A JP18152087 A JP 18152087A JP S6424687 A JPS6424687 A JP S6424687A
Authority
JP
Japan
Prior art keywords
output
evaluation function
difference
change
value
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
JP62181520A
Other languages
Japanese (ja)
Inventor
Yoriyasu Takeguchi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP62181520A priority Critical patent/JPS6424687A/en
Priority to EP88306679A priority patent/EP0300775B1/en
Priority to DE3853899T priority patent/DE3853899T2/en
Priority to US07/222,171 priority patent/US4953214A/en
Priority to KR1019880009095A priority patent/KR920003860B1/en
Publication of JPS6424687A publication Critical patent/JPS6424687A/en
Pending legal-status Critical Current

Links

Landscapes

  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

PURPOSE:To obtain a large compression rate in a natural image from a small- sized circuit scale by comparing a change in an image signal with an evaluation function decreased monotonously and outputting a distance between samples and a code in the changing direction as transmission values when a large change exists. CONSTITUTION:An input signal is A/D-converted by an A/D converter. A subtractor 6 calculates a difference between an initial value of an input signal and each sample. An output of a counter 4 is given to a ROM 8 as an address. An evaluation function decreased monotonously defined in a range in the unit of sample value is recorded in the ROM 8, a comparator 8 compares the said difference and the evaluation function and generates an output when the difference exceeds the evaluation function. A register 5 rewrites the initial value of the image signal by the output. The counter 4 counts the number of samples and is reset by the output of the comparator 9 and outputs the code of the result of the difference with the count value just before resetting as a transmission value. Thus, the part having a rapid change is finely sampled and the part of slow change is coarsely sampled.
JP62181520A 1987-07-21 1987-07-21 Image encoder Pending JPS6424687A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP62181520A JPS6424687A (en) 1987-07-21 1987-07-21 Image encoder
EP88306679A EP0300775B1 (en) 1987-07-21 1988-07-20 Signal encoding and decoding method and device
DE3853899T DE3853899T2 (en) 1987-07-21 1988-07-20 Method and device for coding and decoding a signal.
US07/222,171 US4953214A (en) 1987-07-21 1988-07-21 Signal encoding and decoding method and device
KR1019880009095A KR920003860B1 (en) 1987-07-21 1988-07-21 Coding decoding circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62181520A JPS6424687A (en) 1987-07-21 1987-07-21 Image encoder

Publications (1)

Publication Number Publication Date
JPS6424687A true JPS6424687A (en) 1989-01-26

Family

ID=16102194

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62181520A Pending JPS6424687A (en) 1987-07-21 1987-07-21 Image encoder

Country Status (1)

Country Link
JP (1) JPS6424687A (en)

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