JPS6482782A - Image encoding system - Google Patents
Image encoding systemInfo
- 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
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.
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) |
-
1987
- 1987-09-24 JP JP62240453A patent/JPH0628444B2/en not_active Expired - Fee Related
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 |