| CPC A61B 5/441 (2013.01) [A61B 5/0077 (2013.01); G02B 21/084 (2013.01); G02B 21/125 (2013.01)] | 19 Claims |
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18. A method for capturing images for a 3D reconstruction of a target object using an inspection unit for direct application to a skin of a patient, said inspection unit comprising an optical array of elements comprising a first ring of a plurality of light sources arranged around the optical axis and a second ring of a plurality of light sources arranged around the optical axis, the first ring of light sources projecting light substantially parallel to the optical axis onto a target object from a vertical direction and the second ring of light sources projecting light substantially perpendicular to the optical axis onto the target object to provide illumination of the target object from a horizontal direction, wherein the second ring of light sources are in a plane parallel to a plane of the target object to generate shadows of the target object, a digital image capturing device having a field of view and being located on the optical axis, and a viewing surface for direct application to the skin of the patient through which the target object can be imaged, wherein the optical elements further comprises an imaging lens having a radius of curvature and a focal length defining a position of a focus point along the optical path, focusing means for changing the focus position along the optical path as a function of a plurality of adjustment values, and a first calibration pattern for locating in a fixed position with respect to a reference viewing surface and in the field of view of the image capturing device, wherein a relationship between first adjustment values of the plurality of adjustment values of the focusing means and the positions of focus points along the optical path are defined during a calibration, including a second adjustment value of the plurality of adjustment values for a focus position at the fixed position of the first calibration pattern, and a second calibration pattern for locating in a second fixed known position with respect to a reference position and in the field of view of the image capturing device, and a stored third adjustment value of the plurality of adjustment values for a second focus position at the second fixed known position of the second calibration pattern, the method comprising:
capturing a series of different digital images of the target object on the skin of the patient with the digital image capturing device when the target object is illuminated with different ones of the light sources of the first and second ring of light sources to generate the shadows of the target object to reconstruct a shape of the target object.
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