Image processing apparatus, image processing method, and storage medium

An image processing method of determining a height of a surface of an object, the object having a structure including a high light transmittance layer located on a color development layer, the image processing method comprising:

• acquiring a plurality of pieces of image data obtained by capturing an image of the object illuminated with light emitted from a light source in a plurality of geometric conditions, and also acquiring parameters for determining the respective geometric conditions;
• performing a generation process of generating, based on the plurality of pieces of image data, specular reflection data representing a reflection characteristic of light which is part of light emitted from the light source and specularly reflected as specular reflection light from the object and generating diffuse reflection data representing a reflection characteristic of light which is part of the light emitted from the light source and diffuse-reflected as diffuse reflection light from the object;
• performing a first determination process of determining a height of the color development layer based on the diffuse reflection data;
• and
• performing a second determination process of determining a height of the high light transmittance layer based on the parameters, the specular reflection data, and the height of the color development layer.

A non-transitory computer-readable storage medium storing instructions that, when executed by a computer, cause the computer to perform an image processing method of determining a height of a surface of an object having a structure including a high light transmittance layer located on color development layer, the image processing method comprising:

• acquiring a plurality of pieces of image data obtained by capturing an image of the object illuminated with light emitted from a light source in a plurality of geometric conditions, and also acquiring parameters for determining the respective geometric conditions;
• performing a generation process of generating, based on the plurality of pieces of image data, specular reflection data representing a reflection characteristic of light which is part of light emitted from the light source and specularly reflected as specular reflection light from the object and diffuse reflection data representing a reflection characteristic of light which is part of the light emitted from the light source and diffuse-reflected as diffuse reflection light from the object;
• performing a first determination process of determining a height of the color development layer based on the diffuse reflection data;
• and
• performing a second determination process of determining a height of the high light transmittance layer based on the parameters, the specular reflection data, and the height of the color development layer.