Method and device for compression by blocks of digital data
AssigneeCanon Kabushiki Kaisha
InventorEric Nguyen
Life of this patent
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Abstract
A method of compression by blocks of digital data representing physical quantities comprises a coding configuration step (E3) in which there is associated with each block of digital data a coding technique chosen from amongst a set (E) of acceptable coding techniques as a function of a criterion. The choice criterion is a function of optimization of the rate or distortion characterizing the coding configuration under the constraint of a given computational resource. Use notably in a transmission videophone system.
Claims26
A method of compression by blocks of digital data representing physical quantities, comprising the steps of:
- a coding configuration step in which there is associated, with each block of digital data, a coding technique chosen from amongst a set of acceptable coding techniques according to a criterion, said choice criterion being a function of optimization of the rate or distortion characterizing the coding configuration under the constraint of a given computational resource, and
- a calculation step for each block of digital data and for each coding technique for a constituent consumed computational resource by means of the coding technique expressed in calculation time,
- wherein the computational resource incorporates the calculation time for obtaining said constituent consumed computational resource and the consumed computational resource for resolution of the optimisation function.
A device for compression by blocks of digital data representing physical quantities, comprising:
- coding configuration means adapted to associate, with each block of digital data, a coding technique chosen from amongst a set of acceptable coding techniques as a function of a criterion, wherein said choice criterion is a function of optimisation of the rate or distortion characterising the coding configuration under the constraint of a given computational resource, and
- calculation means for each block of digital data and for each technique of coding a constituent consumed computational resource by said coding technique expressed in calculation time,
- wherein the computational resource incorporates the calculation time for obtaining said constituent consumed computational resource and the consumed computational resource for resolution of the optimisation function.
Dependencies are inferred from the claim text.