Correction image creation device, radiographic imaging device, imaging device, computer readable medium and correction image creation method

1. A correction image creation device comprising:

an acquisition unit that is configured to acquire at least one original image;

a determination unit that is configured to determine whether or not noise, from an exterior, is superimposed on the at least one original image, the noise from the exterior including at least one of noise caused by scatter radiation, noise caused by an impact, or noise caused by electromagnetic waves; and

a creation unit that is configured to create a correction image, using an original image, among the at least one original image, that has been determined by the determination unit as not having noise from an exterior superimposed thereon, the correction image being used for offset correction of another image obtained by imaging.

2. The correction image creation device according to claim 1 , wherein the acquisition unit is configured to acquire, as the original image, a radiographic image that has been captured by an imaging device that irradiates a subject with radiation from a radiation source and uses a detector to detect radiation that has passed through the subject to thereby capture a radiographic image of the subject, without irradiating the subject with radiation from the radiation source.

3. The correction image creation device according to claim 1 , wherein the acquisition unit is configured to acquire, as the original image, an image that has been captured by a solid-state image sensor without the presence of incident light.

4. The correction image creation device according to claim 1 , wherein the determination unit is configured to determine whether or not noise caused by scatter radiation is superimposed, by comparing, against a predetermined threshold value, mean values of pixel values in a plurality of regions in the original image.

5. The correction image creation device according to claim 1 , wherein the determination unit is configured to determine whether or not noise caused by an impact is superimposed, on the basis of numbers of pixels corresponding to differences away from a reference value in a histogram represented by

(a) differences in pixel values of corresponding pixels in an image for offset correction that has already been created and an original image,

(b) differences in pixel values of corresponding pixels in original images,

(c) differences in pixel values of corresponding pixels in a difference image obtained from a plurality of original images on which noise is not superimposed and an original image, or

(d) differences in pixel values of corresponding pixels in a mean image of a plurality of original images on which noise is not superimposed and an original image, and

numbers of pixels with respect to any one of the differences.

6. The correction image creation device according to claim 1 , wherein the determination unit is configured to determine whether or not noise caused by electromagnetic waves is superimposed, on the basis of the spread of a histogram represented by differences in pixel values of corresponding pixels in an image for offset correction that has already been created and an original image and numbers of pixels with respect to those differences.

7. The correction image creation device according to claim 1 , wherein the determination unit is configured to use, as the original image, an image obtained as a result of noise caused by defective pixels having been removed by a median filter from the original image.

8. A radiographic imaging device comprising:

an imaging device that irradiates a subject with radiation from a radiation source and uses a detector to detect radiation that has passed through the subject to thereby capture a radiographic image of the subject, and

a correction image creation device according to claim 2 .

9. An imaging device comprising:

the correction image creation device according to claim 3 ; and

an imaging device that has a solid-state image sensor.

10. A non-transitory computer readable medium storing a program that causes a computer to function as the correction image creation device according to claim 1 .

11. A correction image creation method comprising:

acquiring at least one original image;

determining whether or not noise, from an exterior, is superimposed on the at least one original image, the noise from the exterior including at least one of noise caused by scatter radiation, noise caused by an impact, or noise caused by electromagnetic waves; and

creating a correction image, using an original image, among the at least one original image, that has been determined as not having noise from an exterior superimposed thereon, the correction image being used for offset correction of another image obtained by imaging.