GB2120504B - Compression process for a digitalized image - Google Patents
Compression process for a digitalized imageInfo
- Publication number
- GB2120504B GB2120504B GB8215894A GB8215894A GB2120504B GB 2120504 B GB2120504 B GB 2120504B GB 8215894 A GB8215894 A GB 8215894A GB 8215894 A GB8215894 A GB 8215894A GB 2120504 B GB2120504 B GB 2120504B
- Authority
- GB
- United Kingdom
- Prior art keywords
- values
- brightness
- coded
- difference
- compression process
- 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.)
- Expired
Links
- 238000007906 compression Methods 0.000 title 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00007—Time or data compression or expansion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N11/00—Colour television systems
- H04N11/04—Colour television systems using pulse code modulation
- H04N11/042—Codec means
- H04N11/046—DPCM
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
The digital values, Bij, of the brightness of points in the i<th> line undergo differential coding with, as reference, the brightness values, Bi-1,j, Bi-1,j-1 or Bi-1,j+1, of the points in the (i-1)<th> line. They are coded by blocks of consecutive values such that the difference in brightness of each point with respect to its point of reference is identical to within a tolerance 2e. The values, Bij, of a block are all coded with respect to the value Bi-1,j or the values Bi-1,j-1 or the values Bi-1,j+1, chosen in order to minimise the difference in brightness. Each block is coded by its brightness difference value, its length and a binary word indicating whether the respective references are Bi-1,j, Bi-1,j-1 or Bi-1,j+1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8110898A FR2524740B1 (en) | 1981-06-02 | 1981-06-02 | METHOD FOR COMPRESSING A DIGITAL IMAGE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2120504A GB2120504A (en) | 1983-11-30 |
| GB2120504B true GB2120504B (en) | 1985-03-13 |
Family
ID=9259101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8215894A Expired GB2120504B (en) | 1981-06-02 | 1982-06-01 | Compression process for a digitalized image |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3219892A1 (en) |
| FR (1) | FR2524740B1 (en) |
| GB (1) | GB2120504B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4605963A (en) * | 1983-08-15 | 1986-08-12 | Rca Corporation | Reduction of control bits for adaptive sub-nyquist encoder |
| JPS60185469A (en) * | 1984-03-03 | 1985-09-20 | Dainippon Screen Mfg Co Ltd | Reading method of picture signal |
| AU616006B2 (en) * | 1988-04-27 | 1991-10-17 | Bil (Far East Holdings) Limited | Method and system for compressing and decompressing digital color video statistically encoded data |
| US4847677A (en) * | 1988-04-27 | 1989-07-11 | Universal Video Communications Corp. | Video telecommunication system and method for compressing and decompressing digital color video data |
| AU616262B2 (en) * | 1988-04-27 | 1991-10-24 | Bil (Far East Holdings) Limited | Compressing color video data |
| CA1326898C (en) * | 1988-04-27 | 1994-02-08 | John Music | Method and system for decompressing color video encoded data |
| US6512853B2 (en) | 1995-08-14 | 2003-01-28 | Barkfort Limited | Method and apparatus for compressing digital image data |
| WO1997007635A2 (en) * | 1995-08-14 | 1997-02-27 | Barkfort Limited | A method and apparatus for compressing digital image data |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1598343A (en) * | 1977-04-04 | 1981-09-16 | Int Computers Ltd | Display systems |
| FR2450016A1 (en) * | 1979-02-23 | 1980-09-19 | Arnaud Jean | METHOD AND APPARATUS FOR COMPRESSING DATA, ESPECIALLY TELEVISION SIGNALS |
-
1981
- 1981-06-02 FR FR8110898A patent/FR2524740B1/en not_active Expired
-
1982
- 1982-05-27 DE DE19823219892 patent/DE3219892A1/en not_active Withdrawn
- 1982-06-01 GB GB8215894A patent/GB2120504B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2524740A1 (en) | 1983-10-07 |
| GB2120504A (en) | 1983-11-30 |
| DE3219892A1 (en) | 1983-12-01 |
| FR2524740B1 (en) | 1986-09-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |