Semi-spherical calibration objects for inspection camera assembly

A method comprising:

• activating a first light source of the plurality of independently controllable light sources to direct first light onto each of the plurality of semi-spherical reflective calibration objects;
• using the camera to capture an image of the plurality of independently controllable light sources;
• for each of the plurality of semi-spherical reflective calibration objects:
• identifying reflection of the first light from a corresponding semi-spherical reflective calibration object in the image;
• identifying an angle at which the first light from the first light is reflected by the corresponding semi-spherical reflective calibration object based on a location of the reflection in an image taken by the camera and based on a size of the corresponding semi-spherical reflective calibration object;
• and
• calculating positions, in a three-dimensional space, of the first light source relative to the camera using the angle identified for each of the corresponding semi-spherical reflective calibration objects.

A non-transitory machine-readable storage medium having embodied thereon instructions executable by one or more machines to perform operations comprising:

• activating a first light source of the plurality of independently controllable light sources to direct first light onto each of the plurality of semi-spherical reflective calibration objects;
• using the camera to capture an image of the plurality of independently controllable light sources;
• for each of the plurality of semi-spherical reflective calibration objects:
• identifying reflection of the first light from a corresponding semi-spherical reflective calibration object in the image;
• identifying an angle at which the first light from the first light is reflected by the corresponding semi-spherical reflective calibration object based on a location of the reflection in an image taken by the camera and based on a size of the corresponding semi-spherical reflective calibration object;
• and
• calculating positions, in a three-dimensional space, of the first light source relative to the camera using the angle identified for each of the corresponding semi-spherical reflective calibration objects.