JPS6482782A - Image encoding system - Google Patents

Image encoding system

Info

Publication number
JPS6482782A
JPS6482782A JP62240453A JP24045387A JPS6482782A JP S6482782 A JPS6482782 A JP S6482782A JP 62240453 A JP62240453 A JP 62240453A JP 24045387 A JP24045387 A JP 24045387A JP S6482782 A JPS6482782 A JP S6482782A
Authority
JP
Japan
Prior art keywords
insignificant
block
threshold value
encoded
coefficients
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
JP62240453A
Other languages
Japanese (ja)
Other versions
JPH0628444B2 (en
Inventor
Yoshihiko Tokunaga
Akira Yasuda
Hiroyoshi Yuasa
Hisataka Fujii
Hiroshi Hamada
Yoshitaka Morikawa
Nobumoto Yamane
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 Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP62240453A priority Critical patent/JPH0628444B2/en
Priority to GB8821600A priority patent/GB2210229B/en
Priority to US07/248,915 priority patent/US5054103A/en
Priority to FR8812454A priority patent/FR2621146A1/en
Priority to DE19883832476 priority patent/DE3832476A1/en
Publication of JPS6482782A publication Critical patent/JPS6482782A/en
Publication of JPH0628444B2 publication Critical patent/JPH0628444B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To reduce distortion due to sudden variation in the light-shade level of a reproduced image by lowering a threshold value for deciding an insignificant coefficient or significant coefficient more and more as there are more and more insignificant blocks at the periphery of a block to be encoded. CONSTITUTION:The threshold value T is adjusted by using a storage part 17 and a threshold value setting part 18. Namely, it is decided whether a block which is already encoded and positioned nearby the block to be encoded is the significant block containing significant coefficients or insignificant block consisting of only insignificant coefficients, and the threshold value T is set smaller and smaller as there are more and more insignificant blocks nearby the block to be encoded. Thus, the frequency of the generation of insignificant blocks consisting of only insignificant coefficients is reduced. Consequently, distortion due to sudden variation in the light-shade level of the reproduced image is reduced.
JP62240453A 1987-09-24 1987-09-24 Image coding method Expired - Fee Related JPH0628444B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP62240453A JPH0628444B2 (en) 1987-09-24 1987-09-24 Image coding method
GB8821600A GB2210229B (en) 1987-09-24 1988-09-15 Picture encoding system
US07/248,915 US5054103A (en) 1987-09-24 1988-09-22 Picture encoding system
FR8812454A FR2621146A1 (en) 1987-09-24 1988-09-23 IMAGE ENCODING SYSTEM
DE19883832476 DE3832476A1 (en) 1987-09-24 1988-09-23 IMAGE CODING SYSTEM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62240453A JPH0628444B2 (en) 1987-09-24 1987-09-24 Image coding method

Publications (2)

Publication Number Publication Date
JPS6482782A true JPS6482782A (en) 1989-03-28
JPH0628444B2 JPH0628444B2 (en) 1994-04-13

Family

ID=17059724

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62240453A Expired - Fee Related JPH0628444B2 (en) 1987-09-24 1987-09-24 Image coding method

Country Status (1)

Country Link
JP (1) JPH0628444B2 (en)

Also Published As

Publication number Publication date
JPH0628444B2 (en) 1994-04-13

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees