Apparatus, method, and storage medium

1. An apparatus comprising:

at least one processor; and

a memory coupled to the at least one processor, the memory having instructions that, when executed by the at least one processor, performs operations as:

an acquisition unit configured to acquire information about an angle of light incident on a target object and information about a gloss characteristic of the target object; and

a determination unit configured to determine, based on the acquired information, a derivation accuracy in reflection characteristic for each position on the target object.

2. The apparatus according to claim 1 , wherein the determination unit performs weighting on the information about the angle of the incident light, based on the information about the gloss characteristic of the target object.

3. The apparatus according to claim 2 , wherein a lower weight is applied to the information about the angle of the incident light as the gloss characteristic of the target object are higher.

4. The apparatus according to claim 1 , wherein the information about the gloss characteristic is information about spread of reflected light near a reflection peak angle of the reflection characteristic.

5. The apparatus according to claim 1 , wherein the information about the gloss characteristic is determined based on a spatial two-dimensional distribution of angle-based reflection characteristic of the target object.

6. The apparatus according to claim 1 , wherein the determination unit determines the derivation accuracy by using information about the gloss characteristic based on an instruction from a user.

7. The apparatus according to claim 1 , wherein the information about the angle includes an angular range and an angular resolution capability is determined based on a relative positional relationship between an illumination unit and the target object and positions of a plurality of light-emitting elements to be lit, the light-emitting elements being included in the illumination unit.

8. The apparatus according to claim 7 , wherein the determination unit determines the derivation accuracy by multiplying an index indicating the angular range by an index indicating the angular resolution capability.

9. The apparatus according to claim 7 , wherein the determination unit determines the derivation accuracy based on a linear sum of an index indicating the angular range and an index indicating the angular resolution capability.

10. The apparatus according to claim 7 , wherein the determination unit determines the derivation accuracy based on a weighted average obtained by performing predetermined weighting on an index indicating the angular range and an index indicating the angular resolution capability.

11. The apparatus according to claim 7 , wherein the determination unit acquires the angular resolution capability from a histogram of angles formed by two lit light-emitting elements of the illumination unit for each position on the target object.

12. The apparatus according to claim 1 , wherein the at least one processor further permorns operations as a presenting unit configured to present the derivation accuracy to a user.

13. The apparatus according to claim 1 , wherein the at least one processor further performs operations as a derivation unit configured to derive, in synchronization with a timing at which positions of a plurality of light-emitting elements to be lit, the light-emitting elements being included in an illumination unit, are changed, a spatial two-dimensional distribution of reflection characteristic for each position on the target object, based on an image captured by can imaging unit.

14. A method comprising:

acquiring information about an angle of light incident on a target object and information about a gloss characteristic of the target object and

determining, based on the acquired information, a derivation accuracy in reflection characteristic for each position on the target object.

15. A non-transitory computer-readable storage medium storing instructions that, when executed by a computer, cause the computer to perform a method, the method comprising:

acquiring information about an angle of light incident on a target object and information about a gloss characteristic of the target object; and

determining, based on the acquired information, a derivation accuracy in reflection characteristic for each position on the target object.