Image processing apparatus, image pickup apparatus, image processing method, and image processing program using compound kernel

1. An image processing apparatus that blurs a picked-up image based on distance information on a subject, comprising:

a restoration kernel acquisition section that acquires a restoration kernel as a kernel for eliminating degradation of an image, wherein the restoration kernel acquisition section acquires the restoration kernel associated with a distance and an angle of view corresponding to an area to be processed on the picked-up image;

a blur kernel acquisition section that acquires a blur kernel as a kernel for blurring the image;

a compound kernel acquisition section that acquires a compound kernel obtained by merging the restoration kernel with the blur kernel; and

an image processing section that eliminates the degradation of the picked-up image and blurs the picked-up image by using the compound kernel.

2. The image processing apparatus according to claim 1 , wherein the blur kernel acquisition section acquires the blur kernel associated with either of the distance or the angle of view corresponding to the area to be processed on the picked-up image.

3. The image processing apparatus according to claim 1 , wherein the image processing section assigns the compound kernel to the area to be processed on the picked-up image, and performs blurring processing including image restoration by using the assigned compound kernel.

4. The image processing apparatus according to claim 3 , further comprising:

an image area extension section that determines an extended area as an area including at least one area to be processed, wherein

the image area extension section determines a similarity of the compound kernel assigned to each area to be processed to merge, into one extended area, the areas to be processed corresponding to a plurality of the compound kernels that are determined to be similar to each other, and

the image processing section performs the blurring processing including the image restoration on the extended area by using an identical compound kernel.

5. The image processing apparatus according to claim 4 , wherein the image area extension section determines the similarity based on a size or a shape of the compound kernel assigned to the area to be processed.

6. The image processing apparatus according to claim 4 , wherein the image area extension section determines the similarity based on a spatial frequency characteristic of the compound kernel assigned to the area to be processed.

7. The image processing apparatus according to claim 6 , wherein the image area extension section determines the similarity further based on a visual spatial frequency characteristic.

8. The image processing apparatus according to claim 7 , wherein the image area extension section determines the similarity based on a ratio between an integrated value of a product of the visual spatial frequency characteristic and the spatial frequency characteristic of the compound kernel assigned to the area to be processed, and an integrated value of the visual spatial frequency.

9. An image processing apparatus that blurs a picked-up image based on distance information on a subject, comprising:

a restoration kernel acquisition section that acquires a restoration kernel as a kernel for eliminating degradation of an image;

a blur kernel acquisition section that acquires a blur kernel as a kernel for blurring the image; and

an image processing section that eliminates the degradation of the picked-up image and blurs the picked-up image by using the restoration kernel and the blur kernel, wherein

the restoration kernel acquisition section acquires the restoration kernel associated with a distance and an angle of view corresponding to an area to be processed on the picked-up image, and

the blur kernel acquisition section acquires the blur kernel associated with the distance and the angle of view corresponding to the area to be processed on the picked-up image.

10. An image pickup apparatus comprising:

image pickup unit; and

the image processing apparatus according to claim 1 .

11. A non-transitory recording medium recording thereon an image processing program for causing an image processing apparatus that blurs a picked-up image based on distance information on a subject to execute the steps of:

acquiring a restoration kernel as a kernel for eliminating degradation of an image, wherein the acquired the restoration kernel is associated with a distance and an angle of view corresponding to an area to be processed on the picked-up image;

acquiring a blur kernel as a kernel for blurring the image;

acquiring a compound kernel obtained by merging the restoration kernel with the blur kernel; and

eliminating the degradation of the picked-up image and blurring the picked-up image by using the compound kernel.

12. A non-transitory recording medium recording thereon an image processing program for causing an image processing apparatus that blurs a picked-up image based on distance information on a subject to execute the steps of:

acquiring a restoration kernel as a kernel for eliminating degradation of an image;

acquiring a blur kernel as a kernel for blurring the image; and

eliminating the degradation of the picked-up image and blurring the picked-up image by using the restoration kernel and the blur kernel, wherein

the restoration kernel associated with a distance and an angle of view corresponding to an area to be processed on the picked-up image is acquired in the step of acquiring a restoration kernel, and

the blur kernel associated with the distance and the angle of view corresponding to the area to be processed on the picked-up image is acquired in the step of acquiring a blur kernel.