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

Patent metadata

Field	Value
Publication number	US-9258497-B2
Application number	US-201414293697-A
Country	US
Kind code	B2
Filing date	Jun 2, 2014
Priority date	Mar 30, 2012
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A correction image creation device includes: an acquisition unit that acquires at least one original image, which is a basis when creating a correction image used in offset correction with respect to an image that has been obtained by imaging; a determination unit that determines whether or not noise from the exterior is superimposed on the original image; and a cancellation unit that cancels creation of the correction image in a case in which it has been determined by the determination unit that noise from the exterior is superimposed on the original image.

First claim

What is claimed is:

1. A correction image creation device comprising:
an acquisition unit that acquires at least one original image, which is a basis when creating a correction image used in offset correction with respect to an image that has been obtained by imaging;
a determination unit that determines whether or not noise, from an exterior, is superimposed on the original image; and
a cancellation unit that cancels creation of the correction image in a case in which it has been determined by the determination unit that noise from the exterior is superimposed on the original image.

2. The correction image creation device according to claim 1 , wherein, in a case in which it has been determined that noise from the exterior is superimposed on the original image, the cancellation unit cancels creation of the correction image that uses the original image on which the noise has been superimposed.

3. The correction image creation device according to claim 2 , further comprising a creation unit that creates the correction image, using an original image that has been determined by the determination unit as not having noise from the exterior superimposed on it.

4. The correction image creation device according to claim 1 , wherein the correction image creation device acquires, as the original image, a radiographic image that has been captured by an imaging device, which 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 a subject with radiation from the radiation source.

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

6. The correction image creation device according to claim 1 , wherein the noise is at least one of noise caused by scatter radiation, noise caused by an impact or noise caused by electromagnetic waves.

7. The correction image creation device according to claim 1 , wherein the determination unit determines 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.

8. The correction image creation device according to claim 1 , wherein the determination unit determines whether or not noise caused by an impact is superimposed, on the basis of numbers of pixels with respect to differences away from a reference value 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, differences in pixel values of corresponding pixels in original images, 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 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 the differences.

9. The correction image creation device according to claim 1 , wherein the determination unit determines 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.

10. The correction image creation device according to claim 1 , wherein the determination unit uses, 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.

11. 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 comprising:
an acquisition unit that acquires at least one original image, which is a basis when creating a correction image used in offset correction with respect to an image that has been obtained by imaging;
a determination unit that determines whether or not noise, from an exterior, is superimposed on the original image; and
a cancellation unit that cancels creation of the correction image in a case in which it has been determined by the determination unit that noise from the exterior is superimposed on the original image,

wherein the correction image creation device acquires, as the original image, a radiographic image that has been captured by the imaging device without irradiating a subject with radiation from the radiation source.

12. The radiographic imaging device according to claim 11 , wherein, in a case in which it has been determined that noise from the exterior is superimposed on the original image, the cancellation unit cancels creation of the correction image that uses the original image on which the noise has been superimposed.

13. The radiographic imaging device according to claim 12 , further comprising a creation unit that creates the correction image, using an original image that has been determined by the determination unit as not having noise from the exterior superimposed on it.

14. An imaging device comprising:
the correction image creation device according to claim 5 ; and
an imaging device that has a solid-state image sensor.

15. A non-transitory computer readable medium storing a program for causing a computer to function as the correction image creation device according to claim 1 .

16. The non-transitory computer readable medium according to claim 15 , wherein, in a case in which it has been determined that noise from the exterior is superimposed on the original image, the cancellation unit cancels creation of the correction image that uses the original image on which the noise has been superimposed.

17. The non-transitory computer readable medium according to claim 16 , further comprising a creation unit that creates the correction image, using an original image that has been determined by the determination unit as not having noise from the exterior superimposed on it.

18. A correction image creation method comprising:
acquiring at least one original image, which is a basis when creating a correction image used in offset correction with respect to an image that has been obtained by imaging;
determining whether or not noise, from an exterior, is superimposed on the original image; and
cancelling creation of the correction image in a case in which it has been determined that noise from the exterior is superimposed on the original image.

Assignees

• Fujifilm Corp

Inventors

• Tsuji Tetsuya

Classifications

• G06T5/50

  using two or more images, e.g. averaging or subtraction · CPC title

• G01T1/20

  with scintillation detectors · CPC title

• A61B6/4464

  the source unit or the detector unit being mounted to ceiling · CPC title

• A61B6/5264

  due to motion · CPC title

• A61B6/4283

  characterised by a detector unit being housed in a cassette · CPC title