Image processing apparatus, image processing method, and storage medium

1. An image processing apparatus comprising:

an obtaining unit configured to obtain a fisheye image captured by an imaging unit including a fisheye lens;

a detection unit configured to detect an object in the fisheye image obtained by the obtaining unit;

a setting unit configured to set, based on a distance from a reference position in the fisheye image to a given position in the fisheye image, a minimum size corresponding to the given position, wherein the minimum size is set to decrease as the distance increases; and

an output unit configured to output a detection result by the detection unit, wherein a given object detected at the given position in the fisheye image is excluded from the detection result, if a size of the given object detected at the given position is smaller than the minimum size corresponding to the given position.

2. The image processing apparatus according to claim 1 ,

wherein the reference position is a center in the fisheye image.

3. The image processing apparatus according to claim 1 , wherein the minimum size is set such that a value of the minimum size is same in a concentric circular about the reference position.

4. The image processing apparatus according to claim 1 , wherein the setting unit sets a same value of the minimum size at positions in the fisheye image based on an installation orientation of the imaging unit, the positions being at an equal distance away from the installation position of the imaging unit in a real space.

5. The image processing apparatus according to claim 1 , wherein the setting unit sets the minimum size based further on at least one of an installation orientation of the imaging unit, a height of the detection target object in a real space, and a size of the object in the real space.

6. The image processing apparatus according to claim 1 , wherein the detection unit detects a human body or a part of a human body as the object.

7. An image processing method comprising:

obtaining a fisheye image captured by an imaging unit including a fisheye lens;

detecting an object in the fisheye image obtained in the obtaining;

setting, based on a distance from a reference position in the fisheye image to a given position in the fisheye image, a minimum size corresponding to the given position, wherein the minimum size is set to decrease as the distance increases; and

outputting a detection result in the detecting, wherein a given object detected at the given position in the fisheye image is excluded from the detection result, if a size of the given object detected at the given position is less than the minimum size corresponding to the given position.

8. A non-transitory storage medium storing a program for causing a computer to function as:

an obtaining unit configured to obtain a fisheye image captured by an imaging unit including a fisheye lens;

a detection unit configured to detect an object in the fisheye image obtained by the obtaining unit;

a setting unit configured to set, based on a distance from a reference position in the fisheye image to a given position in the fisheye image, a minimum size corresponding to the given position, wherein the minimum size is set to decrease as the distance increases; and

an output unit configured to output a detection result by the detection unit, wherein a given object detected at the given position in the fisheye image is excluded from the detection result, if a size of the given object detected at the given position is smaller than the minimum size corresponding to the given position.

9. An image processing apparatus comprising:

an obtaining unit configured to obtain a fisheye image captured by an imaging unit including a fisheye lens;

a detection unit configured to detect an object in the fisheye image obtained by the obtaining unit;

a setting unit configured to set, based on a distance from a reference position in the fisheye image to a given position in the fisheye image, a maximum size corresponding to the given position, wherein the maximum size is set to decrease as the distance increases; and

an output unit configured to output a detection result by the detection unit, wherein a given object detected at the given position in the fisheye image is excluded from the detection result, if a size of the given object detected at the given position is larger than the maximum size corresponding to the given position.

10. The image processing apparatus according to claim 9 , wherein the reference position is a center in the fisheye image.

11. The image processing apparatus according to claim 9 , wherein the maximum size is set such that a value of the maximum size is same in a concentric circular about the reference position.

12. The image processing apparatus according to claim 9 , wherein the setting unit sets a same value of the maximum size at positions in the fisheye image based on an installation orientation of the imaging unit, the positions being at an equal distance away from the installation position of the imaging unit in a real space.

13. The image processing apparatus according to claim 9 , wherein the setting unit sets the maximum size based further on at least one of an installation orientation of the imaging unit, a height of the detection target object in a real space, and a size of the object in the real space.

14. The image processing apparatus according to claim 9 , wherein the detection unit detects a human body or a part of a human body as the object.

15. An image processing method comprising:

obtaining a fisheye image captured by an imaging unit including a fisheye lens;

detecting an object in the fisheye image obtained in the obtaining;

setting, based on a distance from a reference position in the fisheye image to a given position in the fisheye image, a maximum size corresponding to the given position, wherein the maximum size is set to decrease as the distance increases; and

outputting a detection result in the detecting, wherein a given object detected at the given position in the fisheye image is excluded from the detection result, if a size of the given object detected at the given position is larger than the maximum size corresponding to the given position.

16. A non-transitory storage medium storing a program for causing a computer to function as:

an obtaining unit configured to obtain a fisheye image captured by an imaging unit including a fisheye lens;

a detection unit configured to detect an object in the fisheye image obtained by the obtaining unit;

a setting unit configured to set, based on a distance from a reference position in the fisheye image to a given position in the fisheye image, a maximum size corresponding to the given position, wherein the maximum size is set to decrease as the distance increases; and

an output unit configured to output a detection result by the detection unit, wherein a given object detected at the given position in the fisheye image is excluded from the detection result, if a size of the given object detected at the given position is larger than the maximum size corresponding to the given position.

17. The image processing apparatus according to claim 1 ,

wherein the setting unit further sets a maximum size corresponding to the given position, such that the maximum size is getting smaller as the distance increases, and

wherein the given object detected at the given position in the fisheye image is excluded from the detection result, if the size of the given object detected at the given position is smaller than the minimum size corresponding to the given position or larger than the maximum size corresponding to the given position.