Method allowing compression and protection parameters to be determined for the transmission of multimedia data over a wireless data channel
AssigneeThales
InventorsCatherine Lamy-Bergot, Cyril Bergeron
Life of this patent
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Abstract
A method allowing operating parameters, such as the compression ratio and/or the protection ratio for a multimedia data transmission channel to be determined, wherein it includes at least one step during which several values of sensitivity are determined for pairs of values fixed source bit-rate, desired compression ratio, a step where the different values obtained for an operating point of the fixed channel are compared with one another, and a step where the optimum sensitivity value is selected, the sensitivity value being defined taking the desired source bit-rate and the compression ratio into account.
Claims18
A method of determining operating parameters for a multimedia data transmission channel, comprising the steps of:
- receiving information about a state of the channel;
- utilizing the received information to determine sensitivity values for a plurality of predetermined pairs of compression ratio and protection ratio, for a given overall fixed source bit-rate of the channel;
- comparing the sensitivity values obtained for the given overall fixed source bit-rate of the channel;
- and
- selecting a preferred sensitivity value, the preferred sensitivity value taking into account a desired source bit-rate and a compression ratio;
- wherein the sensitivity value is determined according to the following relationship:
- D
- ^
- gop
- =
- ∏
- i
- =
- 0
- N
-
-
- (
- 1
- -
- P
- e
- )
- β
- i
-
- n
- i
- ·
- D
- o
- +
- ∑
- i
- =
- 0
- N
-
- [
- ∏
- j
- =
- 0
- i
- -
- 1
-
- (
- 1
- -
-
- P
- e
- )
- β
- j
- ·
- n
- j
- ·
- (
- 1
- -
- (
- 1
- -
-
- P
- e
- )
- β
- i
- ·
- n
- i
- )
- ·
- D
- loss
- i
- ]
- wherein {circumflex over (D)}gop is a distortion of a group of pictures, Pe is a probability of error for a bit, βi is a correction factor for an ith frame, βj is a correction factor for an jth frame, N is a number of frames, ni is a size of an ith frame, nj is a size of an jth frame, Do is distortion observed when a frame is correct, and Dlossi is distortion observed when an ith frame is lost.
A method of determining operating parameters for a multimedia data transmission channel, comprising the steps of:
- receiving information about a state of the channel;
- determining sensitivity values for a plurality of predetermined pairs of compression ratio and protection ratio, for a given overall fixed source bit-rate of the channel;
- comparing the sensitivity values obtained for the given overall fixed source bit-rate of the channel;
- selecting a preferred sensitivity value, the preferred sensitivity value taking into account a desired source bit-rate and a compression ratio;
- separating the data into partitions;
- and
- determining preferred compression and protection ratios for at least a portion of the partitions according to the following relationship:
- D
- ^
- gop
- DP
- =
- ∏
- i
- =
- 0
- N
-
-
- ∏
- k
- =
- 1
- 3
-
-
- (
- 1
- -
- P
- e
- )
- (
- 1
- -
- β
- i
- ,
- k
- )
- ·
- n
- i
- ,
- k
- ·
- D
- o
- +
- ∑
- i
- =
- 0
- N
-
- ∑
- k
- =
- 1
- 3
-
- [
- ∏
- j
- =
- 0
- N
-
-
- ∏
- l
- =
- 1
- k
- -
- 1
-
-
- (
- 1
- -
- P
- e
- )
- β
- j
- ,
- l
-
- n
- j
- ,
- l
-
- ∏
- j
- =
- 0
- i
- -
- 1
-
-
- (
- 1
- -
- P
- e
- )
- β
- j
- ,
- k
-
- n
- j
- ,
- k
-
- (
- 1
- -
- (
- 1
- -
-
- P
- e
- )
- (
- 1
- -
- β
- i
- ,
- k
- )
- ·
- n
- i
- ,
- k
- )
- ·
- D
- loss
- l
- ,
- k
- ]
- ,
- wherein {circumflex over (D)}gopDP is a distortion of a group of pictures for the partitions, Pe is a probability of error for a bit, βi,k is a correction factor for an ith frame of a kth partition, βj,l is a correction factor for a jth frame of an lth partition, βj,k is a correction factor for a jth frame of an kth partition, N is a number of frames, Do is distortion observed when a frame is correct, ni,k is a length of an ith frame of a kth partition, nj,l is a length of an jth frame of an lth partition, nj,k is a length of an jth frame of an kth partition, Dlossi,k is a distortion observed if an ith frame of a kth partition is lost, and
- n
- i
- =
- ∑
- k
- =
- 1
- 3
-
-
- n
- i
- ,
- k
- .
A method of determining operating parameters for a multimedia data transmission channel, comprising the steps of:
- receiving information about a state of the channel;
- determining sensitivity values for a plurality of predetermined pairs of compression ratio and protection ratio, for a given overall fixed source bit-rate of the channel;
- comparing the sensitivity values obtained for the given overall fixed source bit-rate of the channel;
- selecting a preferred sensitivity value, the preferred sensitivity value taking into account a desired source bit-rate and a compression ratio;
- separating the data into partitions;
- and
- determining the compression ratio and the protection ratio for at least a portion of the partitions according to the following relationship:
- D
- ^
- gop
- =
- ∏
- i
- =
- 0
- N
-
-
- (
- 1
- -
- P
- e
- )
- β
- i
-
- n
- i
- ·
- D
- o
- +
- ∑
- i
- =
- 0
- N
-
- [
- ∏
- j
- ,
- j
- ∈
- FS
- i
-
- (
- 1
- -
-
- P
- e
- )
- β
- j
- ·
- n
- j
- ·
- (
- 1
- -
- (
- 1
- -
-
- P
- e
- )
- β
- i
-
- n
- i
- )
- ·
- D
- loss
- i
- ]
- wherein {circumflex over (D)}gop is a distortion of a group of pictures, Pe is a probability of error for a bit, βi is a correction factor for an ith frame, βj is a correction factor for a jth frame, N is a number of frames, ni is a size of an ith frame, nj is a size of an jth frame, Do is distortion observed when a frame is correct, and Dlossi is distortion observed when an ith frame is lost, and wherein data are shuffled by a frame shuffle process of a frame shuffle mode;
- and FSi is a set of the frames on which a frame i depends, the set being defined by a shuffle matrix of the frame shuffle mode.
Dependencies are inferred from the claim text.