Scalable encoding and decoding

A Method for scalable decoding a digital encoded image including a base layer and at least one enhancement layer comprising an up-sampling step providing at least one part of an enhancement layer, based on a corresponding part of a lower layer having a lower level than the considered enhancement layer, the area of said corresponding parts having a scale factor of 4p (p≧1), the lower layer comprising at least one Largest Coding Unit divisible into Q Coding Units, said units being further divisible into K lower Prediction Units,

• wherein, for a Largest Coding Unit of said lower layer which is not divided into smaller Coding Units and which has lower Prediction Units of different sizes, said at least one part of said enhancement layer is divided into K subdivisions having substantially equivalent proportions as the lower Prediction Units of different sizes.

A non-transitory computer readable carrier medium comprising instructions which, when run on a computer or processor, causes the computer or processor to carry out a method for scalable encoding of a digital image into a base layer and at least one enhancement layer comprising an up-sampling step providing at least one part of an enhancement layer, based on a corresponding part of a lower layer having a lower level than the considered enhancement layer, the area of said corresponding parts having a scale factor of 4p (p≧1), the lower layer comprising at least one Largest Coding Unit divisible into Q Coding Units, said units being further divisible into K lower Prediction Units,

• wherein, for a Largest Coding Unit of said lower layer which is not divided into smaller Coding Units and which has lower Prediction Units of different sizes, the corresponding part of said enhancement layer is divided into K subdivisions having substantially equivalent proportions as the lower Prediction Units of different sizes.

A non-transitory computer readable carrier medium comprising instructions which, when run on a computer or processor, causes the computer or processor to carry out a method for scalable decoding a digital encoded image including a base layer and at least one enhancement layer comprising an up-sampling step providing at least one part of an enhancement layer, based on a corresponding part of a lower layer having a lower level than the considered enhancement layer, the area of said corresponding parts having a scale factor of 4p (p≧1), the lower layer comprising at least one Largest Coding Unit divisible into Q Coding Units, said units being further divisible into K lower Prediction Units,

• wherein, for a Largest Coding Unit of said lower layer which is not divided into smaller Coding Units and which has lower Prediction Units of different sizes, said at least one part of said enhancement layer is divided into K subdivisions having substantially equivalent proportions as the lower Prediction Units of different sizes.

An encoding device for scalable encoding of a digital image into a base layer and at least one enhancement layer comprising an up-sampling unit configured to provide at least one part of an enhancement layer, based on a corresponding part of a lower layer having a lower level than the considered enhancement layer, the area of said corresponding parts having a scale factor of 4p (p≧1), the lower layer comprising at least one Largest Coding Unit divisible into Q Coding Units, said units being further divisible into K Prediction Units, the up-sampling unit comprising

• a dividing unit configured to divide into K subdivisions the corresponding part of said enhancement layer, when a Largest Coding Unit of said lower layer is not divided into smaller Coding Units and has lower Prediction Units of different sizes, said K subdivisions having substantially equivalent proportions as the lower Prediction Units of different sizes.

A decoding device for scalable decoding of an encoded digital image including a base layer and at least one enhancement layer, said device comprising an up-sampling unit configured to provide at least one part of an enhancement layer, based on a corresponding part of a lower layer having a lower level than the considered enhancement layer, the area of said corresponding parts having a scale factor of 4p (p≧1), the lower layer comprising at least one Largest Coding Unit divisible into Q Coding Units, said units being further divisible into K Prediction Units, the up-sampling unit comprising

• a dividing unit configured to divide into K subdivisions the corresponding part of said enhancement layer, when a Largest Coding Unit of said lower layer is not divided into smaller Coding Units and has lower Prediction Units of different sizes, said K subdivisions having substantially equivalent proportions as the lower Prediction Units of different sizes.

(canceled)