Patent ID: 11972590
Assignee: CANON KABUSHIKI KAISHA
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 6:
7. An image processing method comprising:
acquiring surface normal information of an object;
acquiring a plurality of first images acquired by capturing the object while changing a polarization angle of light from the object in a first illumination state;
acquiring polarization information of the object; and
generating a second image of the object corresponding to a second illumination state different from the first illumination state,
wherein the light intensity information changes according to the polarization angle, using the plurality of first images,
wherein the generating of the second image:
extracts a partial area of the plurality of first images using the surface normal information; and
generates the second image by changing a luminance value in the partial area based on information on the second illumination state and the light intensity information, and

wherein the following conditional expression is satisfied:

α0−90°≤φ1<α0+90°,

where φ1 is an azimuth angle of a surface normal of the object in the partial area, and α0 is an angle of an illumination direction in the second illumination state.