Image processing method, image processing apparatus, computer readable medium, and imaging apparatus
In the present invention, an image processing method includes a dividing process, a performing process, and a superimposing process. In the dividing process, an image is divided into plural local portions. In the performing process, the blurring processing is performed on at least one of the plural local portions. In the superimposing process, the artificial noise is superimposed on the at least one local portion.
1. An image processing method comprising:
dividing an image into plural local portions;
performing blurring processing on at least one of the plural local portions to blur a background of the image; and
superimposing artificial noise only on the at least one local portion so that a noise amount of the at least one local portion is consistent with a noise amount of portions other than the at least one local portion in the plural local portions where the blurring processing was performed.
2. The image processing method according to claim 1 , wherein the image is divided into the plural local portions according to pieces of distance information that represents distances to respective subjects contained in the image.
3. The image processing method according to claim 1 , wherein an amount of the artificial noise is determined based on a noise characteristic of the image.
4. The image processing method according to claim 3 , wherein the noise characteristic is determined based on shooting sensitivity when the image is taken.
5. The image processing method according to claim 3 , wherein the noise characteristic is determined based on a noise reduction processing parameter.
6. An image processing method comprising:
dividing an image into plural local portions;
performing blurring processing on at least one of the plural local portions except an edge of a subject in the at least one of the plural local portions while maintaining sharpness of the edge; and
performing blurring processing on local portions other than the at least one local portion without maintaining sharpness of an edge of a subject in the local portions other than the at least one local portion,
wherein performing blurring processing is to blur a background of the image.
7. The image processing method according to claim 6 , wherein the image is divided into the plural local portions according to pieces of distance information that represent distances to respective subjects contained in the image.
8. An image processing apparatus comprising:
a local area discriminating unit configured to divide an image into plural local portions;
a blurring unit configured to perform blurring processing on at least one of the plural local portions to blur a background of the image; and
a noise superimposing unit configured to impose artificial noise only on the at least one local portion so that a noise amount of the at least one local portion is consistent with a noise amount of portions other than the at least one local portion in the plural local portions where blurring processing has been performed.
9. The image processing apparatus according to claim 8 , wherein the image is divided into the plural local portions according to pieces of distance information that represent distances to respective subjects contained in the image.
10. The image processing apparatus according to claim 8 , wherein an amount of the artificial noise is determined based on a noise characteristic of the image.
11. The image processing apparatus according to claim 10 , wherein the noise characteristic is determined based on shooting sensitivity when the image is taken.
12. The image processing apparatus according to claim 10 , wherein the noise characteristic is determined based on a noise reduction processing parameter.
13. An image processing apparatus comprising:
a local area discriminating unit configured to divide an image into plural local portions;
a first blurring unit configured to perform blurring processing on at least one of the plural local portions except an edge of a subject in the at least one of the plural local portions while maintaining sharpness of the edge; and
a second blurring unit configured to perform blurring processing on local portions other than the at least one local portion without maintaining sharpness of an edge of a subject in the local portions other than the at least one local portion,
wherein the first and second blurring units are configured to blur a background of the image.
14. The image processing apparatus according to claim 13 , wherein the image is divided into the plural local portions according to pieces of distance information that represent distances to respective subjects contained in the image.
15. An imaging apparatus comprising:
an image processing apparatus having
a local area discriminating unit configured to divide an image into plural local portions;
a blurring unit configured to perform blurring processing on at least one of the plural local portions to blur a background of the image; and
a noise superimposing unit configured to impose artificial noise only on the at least one local portion so that a noise amount of the at least one local portion is consistent with a noise amount of portions other than the at least one local portion in the plural local portions; and
an imaging system that takes the image.
16. The image processing method of claim 1 , wherein the artificial noise is superimposed on the at least one local portion on which the blurring process was performed so that the at least one local portion is equivalent in noise amount to the other of the plural local portions on which the blurring processing was not performed.