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1. WO2004098195 - PROCEDE DE CODAGE D'IMAGE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims:

1. A method for encoding pictures into a bitstream, comprising:
- defining a first value for use at a decoding phase to arrange decoded encoded pictures;
- defining a second value indicating an expected value of the first value;
- calculating at least one parameter indicative of the difference between the first value and the second value; and
- coding said at least one parameter into the bitstream.
2. The method according to the claim 1 further comprising encoding one or more independently decodable pictures, one or more reference pictures, and one or more predicted pictures into the bitstream.

3. The method according to the claim 1 further comprising a transmission step for transmitting said encoded pictures to a decoder.

4. The method according to the claim 1 further comprising VLC coding the calculated parameter, and transmitting the VLC coded parameter.

5. A method for decoding pictures from a bitstream, wherein an ordering value is formed indicating an order of pictures, comprising:

- forming a first value indicating an expected value of the
ordering value;
- decoding at least one parameter from the bitstream to obtain a second value, the at least one decoded parameter being indicative of the difference between the ordering value and the first value; and
- using the first value and the second value to obtain the
ordering value.

6. The method according to the claim 5 further comprising using the ordering value for arranging decoded encoded pictures.

7. The method according to the claim 6 further comprising a decoding step for decoding the encoded pictures for forming decoded pictures, and using the ordering value to arrange the decoded encoded pictures in a presentation order.

8. The method according to the claim 5 further comprising using the ordering value for motion compensation.
9. The method according to the claim 5 further comprising indicating the expected value by multiplying a frame number by the second value.

10. An encoder for encoding pictures into a bitstream, comprising:
- a first value for use at a decoding phase to arrange decoded encoded pictures;
- a second value indicating an expected value of the first value;

- calculating means for calculating at least one parameter indicative of the difference between the first value and the second value; and
- a coder for coding said at least one parameter into the
bitstream.
11. A transmitting device comprising an encoder for encoding pictures into a bitstream, comprising:
- a first value for use at a decoding phase to arrange decoded encoded pictures;
- a second value indicating an expected value of the first value;

- calculating means for calculating at least one parameter indicative of the difference between the first value and the second value; and
- a coder for coding said at least one parameter into the
bitstream.
12. The transmitting device according to claim 11 , comprising means for including said second value in a sequence parameter set.

13. The transmitting device according to claim 11 , wherein said calculating means are arranged to inform the expected value of the first value in respect of an increment of a frame number.
14. The transmitting device according to claim 11 , comprising means for including said at least one parameter in a slice header.

15. The device according to the claim 11 , the coder comprising a VLC coder for VLC coding the calculated parameter, and the device further comprising a transmitter for transmitting the VLC coded parameter.
16. A decoder for decoding pictures from a bitstream, wherein an ordering value is formed indicating an order of pictures, the decoder comprising:
- a first value indicating an expected value of the ordering value;

- means for decoding at least one parameter from the bitstream to obtain a second value, the at least one decoded parameter being indicative of the difference between the ordering value and the first value; and
- means for using the first value and the second value to obtain the ordering value.
17. A receiving device comprising a decoder for decoding pictures from a bitstream, wherein an ordering value is formed indicating an order of pictures, the decoder comprising:
- a first value indicating an expected value of the ordering value;

- means for decoding at least one parameter from the bitstream to obtain a second value, the at least one decoded parameter being indicative of the difference between the ordering value and the first value; and
- means for using the first value and the second value to obtain the ordering value.
18. A client comprising a decoder for decoding pictures from a bitstream, wherein an ordering value is formed indicating an order of pictures, the decoder comprising:
- a first value indicating an expected value of the ordering value;

- a decoder for decoding at least one parameter from the
bitstream to obtain a second value, the at least one decoded parameter being indicative of the difference between the ordering value and the first value; and
- means for using the first value and the second value to obtain the ordering value.
19. A system comprising:
- an encoder for encoding pictures into a bitstream, comprising:

- a first value for use at a decoding phase to arrange
decoded encoded pictures;
- a second value indicating an expected value of the first value;
- calculating means for calculating at least one parameter indicative of the difference between the first value and the second value; and
- a coder for coding said at least one parameter into the
bitstream,
- a transmitter for transmitting the bitstream to a transmission channel,
- a receiver for receiving the bitstream from the transmission channel,
- a decoder for decoding pictures from a bitstream, wherein an ordering value is formed indicating an order of pictures, the decoder comprising:
- a first value indicating an expected value of the ordering value;
- means for decoding at least one parameter from the
bitstream to obtain a second value, the at least one
decoded parameter being indicative of the difference
between the ordering value and the first value; and
- means for using the first value and the second value to obtain the ordering value.

20. A carrier wave comprising encoded pictures in a bitstream, comprising:
- a first value for use at a decoding phase to arrange decoded encoded pictures;

- a second value indicating an expected value of the first value;

- at least one parameter indicative of the difference between the first value and the second value coded into the bitstream.

21. The carrier wave according to claim 20, comprising delivering said second value in a sequence parameter set.
22. The carrier wave according to claim 20, wherein said second value is used to inform the expected value of the first value in respect of an increment of a frame number.
23. The carrier wave according to claim 20, comprising delivering said at least one parameter in a slice header.
24. A software program comprising machine executable steps for encoding pictures into a bitstream:
- defining a first value for use at a decoding phase to arrange decoded encoded pictures;
- defining a second value indicating an expected value of the first value;
- calculating at least one parameter indicative of the difference between the first value and the second value; and
- coding said at least one parameter into the bitstream.
25. A software program comprising machine executable steps for decoding, wherein an ordering value is formed indicating an order of pictures, comprising:
- forming a first value indicating an expected value of the
ordering value;
- decoding at least one parameter from the bitstream to obtain a second value, the at least one decoded parameter being indicative of the difference between the ordering value and the first value; and
- using the first value and the second value to obtain the
ordering value.

26. A storage medium for storing a software program comprising machine executable steps for decoding, wherein an ordering value is formed indicating an order of pictures, comprising:
- forming a first value indicating an expected value of the
ordering value;
- decoding at least one parameter from the bitstream to obtain a second value, the at least one decoded parameter being indicative of the difference between the ordering value and the first value; and
- using the first value and the second value to obtain the
ordering value.