Apparatus, method, and storage medium

A method comprising:

• acquiring a plurality of captured images of a target object imaged under a plurality of different conditions;
• performing a first calculation to calculate a first reflection characteristic of the target object for each pixel position of the captured images using a first spatial resolution based on the captured images;
• determining whether an angular resolution of the calculated first reflection characteristic is lower than a first threshold value;
• and
• performing a second calculation to calculate a second reflection characteristic of the target object using a second spatial resolution lower than the first spatial resolution based on the calculated first reflection characteristic in a case where the angular resolution is lower than the first threshold value.

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 a plurality of captured images of a target object imaged under a plurality of different conditions;
• performing a first calculation to calculate a first reflection characteristic of the target object for each pixel position of the captured images using a first spatial resolution based on the captured images;
• determining whether an angular resolution of the calculated first reflection characteristic is lower than a first threshold value;
• and
• performing a second calculation to calculate a second reflection characteristic of the target object using a second spatial resolution lower than the first spatial resolution based on the calculated first reflection characteristic in a case where the angular resolution is lower than the first threshold value.