FI920202A - encoding method - Google Patents
encoding method Download PDFInfo
- Publication number
- FI920202A FI920202A FI920202A FI920202A FI920202A FI 920202 A FI920202 A FI 920202A FI 920202 A FI920202 A FI 920202A FI 920202 A FI920202 A FI 920202A FI 920202 A FI920202 A FI 920202A
- Authority
- FI
- Finland
- Prior art keywords
- image
- pixel
- difference
- receiver
- binary
- Prior art date
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Abstract
The invention concerns a coding method, in particular for coding a live video signal for a narrow transmission channel, by which method each image of the video signal which is to be transmitted is taken for successive processing in such a way that a reference image previously recorded in the image memory is retrieved from the memory and the images are compared with each other and only the changed image areas are transmitted via the transmission channel to the receiver. According to the invention - every image is processed in pixel form (n x m); - the image and the reference image are compared pixel by pixel and on the basis of the differences in their grey tones a difference image is created; - the difference image, which consists of a continual grey tone scale, is quantized in accordance with a pre-set grey tone scale into a number of sub-difference images where each sub-difference image is a binary image, where each pixel has the binary value 1 or 0 depending upon whether or not there is a grey tone in that pixel according to a particular grey tone scale; - all sub-difference images are coded by utilizing the binary image's coding method and transmitted via the transmission channel to the receiver; - the binary images are received in the receiver and decoded by a corresponding binary image decoding method, after which the image information obtained from the image memory of the receiver is updated by the received difference information pixel by pixel and retrieved from the image memory as a video signal for further processing. <IMAGE>
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI920202A FI92271C (en) | 1992-01-16 | 1992-01-16 | encoding method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI920202A FI92271C (en) | 1992-01-16 | 1992-01-16 | encoding method |
FI920202 | 1992-01-16 |
Publications (4)
Publication Number | Publication Date |
---|---|
FI920202A0 FI920202A0 (en) | 1992-01-16 |
FI920202A true FI920202A (en) | 1993-07-17 |
FI92271B FI92271B (en) | 1994-06-30 |
FI92271C FI92271C (en) | 1994-10-10 |
Family
ID=8534034
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI920202A FI92271C (en) | 1992-01-16 | 1992-01-16 | encoding method |
Country Status (1)
Country | Link |
---|---|
FI (1) | FI92271C (en) |
-
1992
- 1992-01-16 FI FI920202A patent/FI92271C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
FI92271B (en) | 1994-06-30 |
FI920202A0 (en) | 1992-01-16 |
FI92271C (en) | 1994-10-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FG | Patent granted |
Owner name: VISTA COMMUNICATION INSTRUMENTS OY/INC. |
|
BB | Publication of examined application | ||
MM | Patent lapsed |