Image processing apparatus, image processing method, and program
An image processing apparatus comprises a filtering unit for performing recursive filtering on a first signal component and a second signal component that are obtained by emitting radiation at a plurality of levels of energy toward an object, and a generation unit for generating a moving image based on the first signal component and the second signal component on which the recursive filtering is performed. A filter coefficient of the recursive filtering performed on the first signal component and a filter coefficient of the recursive filtering performed on the second signal component differ from each other.
1. An image processing apparatus, comprising:
a filtering unit configured to perform filtering in a time direction on a first signal component and a second signal component that are obtained using energy images of an object, wherein the energy images are obtained as images of a plurality of levels of energy; and
a processor and memory configured to generate a moving image based on the first signal component and the second signal component on which the filtering is performed, wherein
a filter coefficient of the filtering performed on the first signal component and a filter coefficient of the filtering performed on the second signal component differ from each other.
2. The image processing apparatus according to claim 1 , wherein the processor and memory are configured to determine the filter coefficient for the second signal component based on a change in the first signal component in a time direction.
3. The image processing apparatus according to claim 2 , wherein the processor and memory are configured to determine the filter coefficient for the first signal component based on a change in the first signal component in the time direction.
4. The image processing apparatus according to claim 1 , wherein the processor and memory are configured to determine the filter coefficient for the second signal component based on a change in the first signal component in a spatial direction.
5. The image processing apparatus according to claim 4 , wherein the processor and memory are configured to determine the filter coefficient for the first signal component based on a change in the first signal component in the spatial direction.
6. The image processing apparatus according to claim 1 , wherein the first signal component represents a surface density, and
the second signal component represents an effective atomic number.
7. The image processing apparatus according to claim 1 , wherein the first signal component represents a value that is based on an attenuation ratio at a level of energy, and
the second signal component represents an effective atomic number.
8. The image processing apparatus according to claim 1 , wherein the first signal component represents a thickness of a first substance, and
the second signal component represents a thickness of a second substance.
9. The image processing apparatus according to claim 1 , which is configured to emit radiation at the plurality of levels of energy in a single emission of radiation.
10. The image processing apparatus according to claim 1 , wherein the filtering unit is configured to perform filtering in a time direction and in a spatial direction on the first signal component and the second signal component.
11. A non-transitory storage medium storing a program for causing a computer to function as the image processing apparatus according to claim 1 .
12. A non-transitory storage medium storing a program for causing a computer to function as the image processing apparatus according to claim 10 .
13. An image processing method, comprising the steps of:
performing filtering in a time direction on a first signal component and a second signal component that are obtained using energy images of an object, wherein the energy images are obtained as images of a plurality of levels of energy; and
generating a moving image based on the first signal component and the second signal component on which the filtering is performed, wherein
a filter coefficient of the filtering performed on the first signal component and a filter coefficient of the filtering performed on the second signal component differ from each other.
14. A non-transitory storage medium storing a program for causing a computer to function as the image processing method according to claim 13 .