3d image capture apparatus with cover window fiducials for calibration

A 3D imaging apparatus, comprising:

• a housing;
• an image sensor within the housing;
• a first mirror and a second mirror each within the housing, the first and second mirrors positioned to receive an image from an object external to the housing and provide the image to the image sensor;
• and
• an aperture element having a plurality of apertures, located within the housing along an optical path between the object and the image sensor, for providing the image along a plurality of optical channels corresponding with the apertures to the image sensor;
• and
• a transparent cover positioned within the optical path and having a plurality of fiducials detectable by the image sensor for use in calibrating the apparatus or checking a calibrated state of the apparatus, wherein the housing includes the transparent cover,
• wherein a depth of field of the apparatus includes the transparent cover.