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Using spherical mirrors in place of wide-angle cameras allows forcost-effective monitoring of manufacturing processes in hazardous environment,where a camera would normally not operate. This includes environments of highheat, vacuum and strong electromagnetic fields. Moreover, it allows thelayering of multiple camera types (e.g., color image, near-infrared,long-wavelength infrared, ultraviolet) into a single wide-angle output, whilstaccounting for the different camera placements and lenses used. Normally, thedifferent camera positions introduce a parallax shift between the images, butwith a spherical projection as produced by a spherical mirror, this parallaxshift is reduced, depending on mirror size and distance to the monitoringtarget.  This paper introduces a variation of the 'mirror ball projection', thataccounts for distortion produced by a perspective camera at the pole of theprojection. Finally, the efficacy of process monitoring via a mirror ball isevaluated.

Improved mirror ball projection for more accurate merging of multiple camera outputs and process monitoring