Image processing apparatus, image processing method, and storage medium

1. An image processing apparatus for combining objects included in a plurality of images into one image, the image processing apparatus comprising:

a specification unit configured to, based on a reference image out of a plurality of images and a plurality of comparative images out of the plurality of images, specify a difference region in each of the plurality of comparative images, the difference region including an object subjected to combination and corresponding to a difference from the reference image;

a determination unit configured to, based on a plurality of difference regions specified in the plurality of comparative images by the specification unit, determine an object region corresponding to an object included in the reference image; and

a combination unit configured to, based on the object region in the reference image determined by the determination unit and the plurality of difference regions in the plurality of comparative images, combine, with the reference image, the objects subjected to combination included in the plurality of difference regions so that the object corresponding to the object region is included in the reference image with which the plurality of difference regions are combined.

2. The image processing apparatus according to claim 1 , further comprising an extraction unit configured to, based on the object region in the reference image determined by the determination unit, extract the object corresponding to the object region from the reference image,

wherein the combination unit is configured to combine, with the reference image, images of difference regions in the plurality of comparative images, and further to combine, with the reference image, the object extracted by the extraction unit at a position corresponding to the object region in the combined image acquired by the combination.

3. The image processing apparatus according to claim 2 , wherein the combination unit is configured to combine, with the reference image, the object extracted by the extraction unit weighted by a weight based on the plurality of difference regions in the plurality of comparative images.

4. The image processing apparatus according to claim 1 , wherein the combination unit is configured to combine, with the reference image, images of the difference regions so as to restrict the combination of the object region in the reference image and images of the difference regions in the comparative images.

5. The image processing apparatus according to claim 1 , wherein the determination unit is configured to, based on positions of the difference regions in the plurality of comparative images, determine the object region corresponding to the object included in the reference image.

6. The image processing apparatus according to claim 5 , wherein the determination unit is configured to determine, based on a number of times coordinates for the plurality of comparative images are specified as the difference regions by the specification unit, the object region corresponding to the object included in the reference image.

7. The image processing apparatus according to claim 1 , further comprising an output unit output a combined image obtained by the combining by the combination unit.

8. The image processing apparatus according to claim 7 , wherein the output unit causes a display apparatus to display the combined image.

9. The image processing apparatus according to claim 7 , wherein the output unit causes a printing apparatus to print the combined image.

10. The image processing apparatus according to claim 1 , wherein the plurality of images are frames included in a moving image.

11. The image processing apparatus according to claim 10 , wherein the plurality of images are frames selected from the moving image in accordance with an instruction by a user.

12. The image processing apparatus according to claim 10 , wherein the reference image is a last frame out of the frames in the moving image.

13. An image processing method, executed by at least one processor, for combining objects included in a plurality of images into one image, the image processing method comprising:

specifying, based on a reference image out of a plurality of images and a plurality of comparative images out of the plurality of images, a difference region, in each of the plurality of comparative images, the difference region including an object subjected to combination corresponding to a difference from the reference image;

determining, based on a plurality of difference regions specified in the plurality of comparative images, an object region corresponding to an object included in the reference image; and

combining, based on the determined object region in the reference image and the plurality of difference regions in the plurality of comparative images, with the reference image, the objects subjected to combination included in the plurality of difference regions so that the object corresponding to the object region is included in the reference image with which the plurality of difference regions are combined.

14. A non-transitory computer-readable storage medium storing a program that causes a computer to execute the image processing method according to claim 13 .