Method and apparatus for compressing image signals
AssigneeFUJIFILM Corporation
InventorTakeshi Funahashi
Life of this patent
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Abstract
A plurality of radiation image signals respectively representing a plurality of radiation images of an object, which radiation images have been formed with several kinds of radiation having different energy distributions, are obtained. An energy subtraction image signal, which has been formed from the plurality of the radiation image signals, is also obtained. Compression processing is performed on the plurality of the radiation image signals and the energy subtraction image signal. The energy subtraction image signal is compressed with a compressibility higher than the compressibility with respect to each of the radiation image signals.
Claims11
A method of compressing image signals, comprising the steps of:
- i) obtaining a plurality of radiation image signals respectively representing a plurality of radiation images of an object, which radiation images have been formed with several kinds of radiation having different energy distributions,
- ii) obtaining an energy subtraction image signal, which has been formed from the plurality of the radiation image signals, and
- iii) performing reversible compression processing on the plurality of the radiation image signals and irreversible compression processing on the energy subtraction signal,
- wherein the energy subtraction image signal is compressed with a compressibility higher than the compressibility with respect to each of the radiation image signals.
An apparatus for compressing image signals wherein:
- a plurality of radiation image signals respectively representing a plurality of radiation images of an object, which radiation images have been formed with several kinds of radiation having different energy distributions, are obtained,
- an energy subtraction image signal, which has been formed from the plurality of the radiation image signals, is obtained, and
- compression processing is performed on the plurality of the radiation image signals and the energy subtraction image signal are compressed,
- the apparatus comprising;
- a) radiation image signal compressing means for performing compression processing on each of the radiation image signals with a reversible first compressing process, and
- b) energy subtraction image signal compressing means for performing compression processing on the energy subtraction image signal with a an irreversible second compressing process,
- a compressibility in the second compressing process being higher than the compressibility in the first compressing process.
Dependencies are inferred from the claim text.