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US 10,475,181 B2Granted
Image processing apparatus, image processing method, and image processing program
AssigneeFUJIFILM Corporation
InventorTakahiro Kawamura
Life of this patent
Estimating the term…
Abstract
An image acquisition unit acquires first and second radiation images from first and second radiation detectors. A first frequency analysis unit generates a first high-frequency component and a first low-frequency component of the first radiation image, and a second frequency analysis unit generates a second low-frequency component of the second radiation image. A subtraction processing unit generates a subtraction low-frequency component from the first low-frequency component and the second low-frequency component, and a synthesis unit synthesizes the subtraction low-frequency component and the first high-frequency component to generate a processed image.
Claims5
An image processing apparatus comprising:
- a storage device, storing information on corresponding relationships between different imaging portions of a subject and a plurality of frequency bands, wherein each corresponding relationship includes a predetermined range of frequency bands for extracting a specific structure in an imaging portion of the subject;
- and
- a processor configured to,
- acquire two radiation images obtained by radiation rays passed through an imaging portion of the subject, having different energy distributions and different amounts of radiation,
- generate a first high-frequency component and a first low-frequency component which are a high-frequency component and a low-frequency component of a first radiation image acquired by radiation having a large amount of radiation among the two radiation images,
- generate a second low-frequency component which is a low-frequency component of a second radiation image acquired by radiation having a small amount of radiation among the two radiation images,
- perform weighting and subtraction between corresponding pixels with respect to the first low-frequency component and the second low-frequency component to generate a subtraction low-frequency component obtained by extracting a specific structure of the subject, and
- synthesize the subtraction low-frequency component and the first high-frequency component to generate a processed image,
- wherein the first high-frequency component and the first low-frequency component are generated to have different frequency bands according to one of the corresponding relationships stored in the storage device, wherein the first high-frequency component has a highest frequency band in a predetermined range of frequency bands for extracting the specific structure in the imaging portion of the subject, and the first low-frequency component has a lowest frequency band in the predetermined range of frequency bands, and
- wherein the second low-frequency component is generated to have the same frequency band as the first low-frequency component.
7 more elements
An image processing method comprising:
- acquiring two radiation images obtained by radiation rays passed through an imaging portion of a subject, having different energy distributions and different amounts of radiation;
- generating a first high-frequency component and a first low-frequency component which are a high-frequency component and a low-frequency component of a first radiation image acquired by radiation having a large amount of radiation among the two radiation images;
- generating a second low-frequency component which is a low-frequency component of a second radiation image acquired by radiation having a small amount of radiation among the two radiation images;
- performing weighting and subtraction between corresponding pixels with respect to the first low-frequency component and the second low-frequency component to generate a subtraction low-frequency component obtained by extracting a specific structure of the subject;
- and
- synthesizing the subtraction low-frequency component and the first high-frequency component to generate a processed image,
- wherein the first high-frequency component and the first low-frequency component are generated according to a corresponding relationship between the imaging portion of the subject and a plurality of frequency bands, wherein the corresponding relationship includes a predetermined range of frequency bands for extracting the specific structure in the imaging portion of the subject, the first high-frequency component has a highest frequency band in the predetermined range of frequency bands, and the first low-frequency component has a lowest frequency band in the predetermined range of frequency bands, and
- wherein the second low-frequency component is generated to have the same frequency band as the first low-frequency component.
5 more elements
A non-transitory computer-readable recording medium having stored therein an image processing program that causes a computer to execute:
- a process of acquiring two radiation images obtained by radiation rays passed through an imaging portion of a subject, having different energy distributions and different amounts of radiation;
- a process of generating a first high-frequency component and a first low-frequency component which are a high-frequency component and a low-frequency component of a first radiation image acquired by radiation having a large amount of radiation among the two radiation images;
- a process of generating a second low-frequency component which is a low-frequency component of a second radiation image acquired by radiation having a small amount of radiation among the two radiation images;
- a process of performing weighting and subtraction between corresponding pixels with respect to the first low-frequency component and the second low-frequency component to generate a subtraction low-frequency component obtained by extracting a specific structure of the subject;
- and
- a process of synthesizing the subtraction low-frequency component and the first high-frequency component to generate a processed image,
- wherein the first high-frequency component and the first low-frequency component are generated according to a corresponding relationship between the imaging portion of the subject and a plurality of frequency bands, wherein the corresponding relationship includes a predetermined range of frequency bands for extracting the specific structure in the imaging portion of the subject, the first high-frequency component has a highest frequency band in the predetermined range of frequency bands, and the first low-frequency component has a lowest frequency band in the predetermined range of frequency bands, and
- wherein the second low-frequency component is generated to have the same frequency band as the first low-frequency component.
5 more elements
Dependencies are inferred from the claim text.