Loading patent…
AssigneeCanon Kabushiki Kaisha
InventorsAtsushi IWASHITA, Sota TORII, Takeshi NODA, Kosuke TERUI, Akira TSUKUDA, Ryuichi FUJIMOTO
Estimating the term…
An image processing apparatus generates a plurality of attenuation rate images using a plurality of radiation images corresponding to a plurality of different radiation energies obtained by irradiating an object with radiation, corrects the radiation images or the attenuation rate images so as to reduce an error of an attenuation rate caused depending on at least one of a dose of the radiation, a thickness of the object, and energy of the radiation, and generates a material characteristic image by energy subtraction processing using the plurality of attenuation rate images after the correction.
An image processing apparatus comprising:
An image processing apparatus comprising:
An image processing apparatus comprising a processing unit configured to perform energy subtraction processing (a) using a radiation spectrum obtained by performing correction based on a plurality of attenuation rates corresponding to a plurality of different radiation energies obtained by irradiating an object with radiation and a difference between a pixel value obtained by calculation and a pixel value obtained by actual measurement, or (b) using at least one attenuation rate obtained by performing correction so as to reduce an error of at least one attenuation rate caused depending on at least one of a dose of the radiation, a thickness of the object, and energy of the radiation.
An image processing method comprising performing energy subtraction processing (a) using a radiation spectrum obtained by performing correction based on a plurality of attenuation rates corresponding to a plurality of different radiation energies obtained by irradiating an object with radiation and a difference between a pixel value obtained by calculation and a pixel value obtained by actual measurement, or (b) using at least one attenuation rate obtained by performing correction so as to reduce an error of at least one attenuation rate caused depending on at least one of a dose of the radiation, a thickness of the object, and energy of the radiation.
Dependencies are inferred from the claim text.