1. An apparatus comprising at least one processor and at least one memory including computer program code the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: for decoding an encoded signal configured to:
divide the encoded signal received for a first time period into at least a mono encoded signal, a mid side information and an intensity stereo information, wherein the mono encoded signal, the mid side information and the intensity stereo information represent an encoded first and second channels of a multichannel audio signal;
generate a mono decoded signal dependent on the mono encoded signal part;
generate the first and second channels of the multichannel audio signal dependent on the mono decoded signal, and at least one of the mid side information and the intensity stereo information of the encoded signal, and wherein the mid side information of the encoded signal comprises at least one side channel value, and wherein the intensity stereo information part of the encoded signal comprises at least one intensity side channel encoded value; and
determine at least one characteristic of the encoded signal associated with at least one sub band of the first and second channels of the multi-channel audio signal, wherein the apparatus comprises a spectral post processor configured to determine whether or not post-processing of the encoded signal is required dependent on the at least one characteristic, and when it is determined that post processing of the encoded signal is not required the apparatus is configured to generate spectral coefficients for the first and second channels for the at least one sub band of the multi-channel audio signal dependent on the side channel value for the at least one sub band from the mid side information.
2. The apparatus as claimed in claim 1, wherein the characteristic comprises at least one of:
an auditory gain greater than a threshold value;
an auditory scene being wholly located in at least one of the encoded first and second channels; and
the second part not being null.
3. The apparatus as claimed in claim 1, wherein the mono decoded signal comprises at least one combined channel frequency domain representation, and wherein the at least one combined channel frequency domain representation comprises at least two combined channel spectral coefficient sub bands, each combined channel spectral sub band comprising at least one spectral coefficient value.
4. The apparatus as claimed in claim 1, wherein the at least one side channel value is dependent on a difference between a first channel spectral coefficient value and the second encoded channel spectral coefficient value.
5. The apparatus as claimed in claim 1 wherein each intensity side channel encoded value comprises an encoded energy ratio between the maximum of a sub band of the first encoded channel spectral coefficients and a sub band of the second encoded channel spectral coefficients, and the minimum of the sub band of the first encoded channel spectral coefficients and the sub band of the second encoded channel spectral coefficients.
6. The apparatus as claimed in claim 1 wherein the mono encoded signal is an encoded combined channel time domain audio signal.
7. A method comprising:
dividing an encoded signal received for a first time period into at least a mono encoded signal, a mid side information and an intensity stereo information, wherein the mono encoded signal, the mid side information and the intensity stereo information represent an encoded first and second channels of a multichannel audio signal;
generating a mono decoded signal dependent on the mono encoded signal part; and
generating the first and second channels of the multichannel audio signal dependent on the mono decoded signal, and at least one of the mid side information and the intensity stereo information of the encoded signal, and wherein the mid side information of the encoded signal comprises at least one side channel value, and wherein the intensity stereo information part of the encoded signal comprises at least one intensity side channel encoded value; and
determining at least one characteristic of the encoded signal associated with at least one sub band of the first and second channels of the multi-channel audio signal, wherein the apparatus comprises a spectral post processor configured to determine whether or not post-processing of the encoded signal is required dependent on the at least one characteristic, and when it is determined that post processing of the encoded signal is not required the apparatus is configured to generate spectral coefficients for the first and second channels for the at least one sub band of the multi-channel audio signal dependent on the side channel value for the at least one sub band from the mid side information.
8. The method as claimed in claim 7, wherein the characteristic comprises at least one of:
an auditory gain greater than a threshold value;
an auditory scene being wholly located in at least one of the encoded first and second channels; and
the second part not being null.
9. The method as claimed in claim 7, wherein the mono decoded signal comprises at least one combined channel frequency domain representation, and wherein each combined channel frequency domain representation comprises at least two combined channel spectral coefficient sub bands, each combined channel spectral sub band portion comprising at least one spectral coefficient value.
10. The method as claimed in claim 7, wherein each side channel value is dependent on a difference between a first channel spectral coefficient value and the second encoded channel spectral coefficient value.
11. The method as claimed in claim 7, wherein each intensity side channel encoded value comprises an encoded energy ratio between the maximum of a sub band of the first encoded channel spectral coefficients and a sub band of the second encoded channel spectral coefficients, and the minimum of the sub band of the first encoded channel spectral coefficients and the sub band of the second encoded channel spectral coefficients.
12. The method as claimed in claim 7, wherein the mono encoded signal is an encoded combined channel time domain audio signal.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of reconstructing an image from measured line-integrals of an object, the method comprising the steps of: binning of the measured line-integrals into a plurality of temporal bins; determining a plurality of motion fields for the plurality of temporal bins; selecting first data from a selected bin of the plurality of temporal bins; forward-projecting an intermediate image for forming second data by using a motion field of the plurality of motion fields that belongs to the selected temporal bin; determining a difference between the first data and the second data; up-dating the intermediate image on the basis of the difference.
2. The method according to claim 1, wherein the intermediate image is up-dated on the basis of a back-projection performed by using the motion field that belongs to the selected temporal bin.
3. The method according to claim 1, wherein the plurality of motion fields contains information with respect to a location shift and a local deformation of basis functions of the intermediate image with regard to the measured line-integrals.
4. The method according to claim 1, wherein the steps of claim 1 are iteratively performed until an end criterion has been fulfilled.
5. The method according to claim 1, wherein the plurality of motion fields describes at least one of a motion and deformation of the object with respect to a reference grid of the intermediate image.
6. The method according to claim 1, wherein the plurality of motion fields is determined from a set of images where each image is reconstructed using data from one temporal bin of the plurality of temporal bins only.
7. An image processing device for reconstructing an image from measured line-integrals, comprising: a storage for storing the positron emission data; and an image processor for reconstructing the image from the measured line-integrals; wherein the image processor is adapted to performs the following operation: binning of the measured line-integrals into a plurality of temporal bins; determining a plurality of motion fields for the plurality of temporal bins; selecting first data from a selected bin of the plurality of temporal bins; forward-projecting an intermediate image for forming second data by using a motion field of the plurality of motion fields that belongs to the selected temporal bin; determining a difference between the first data and the second data; and up-dating the intermediate image on the basis of the difference.
8. A positron emission tomography system, wherein the positron emission tomography system includes a storage for storing measured line-integrals and an image processor, wherein the image processor performs the following operation: binning of the measured line-integrals into a plurality of temporal bins; determining a plurality of motion fields for the plurality of temporal bins; selecting first data from a selected bin of the plurality of temporal bins; forward-projecting an intermediate image for forming second data by using a motion field of the plurality of motion fields that belongs to the selected temporal bin; determining a difference between the first data and the second data; up-dating the intermediate image on the basis of the difference.
9. A computer program stored on a computer readable medium comprising computer program means to cause a processor to execute the following steps when the computer program means are executed on the processor: binning of the measured line-integrals into a plurality of temporal bins; determining a plurality of motion fields for the plurality of temporal bins; selecting first data from a selected bin of the plurality of temporal bins; forward-projecting an intermediate image for forming second data by using a motion field of the plurality of motion fields that belongs to the selected temporal bin; determining a difference between the first data and the second data; up-dating the intermediate image on the basis of the difference.