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The technology behind MIRA


Peter Torma, PhD - April 23, 2018 - 0 comments

The human visual system perceives 3D by combining the images received by two eyes. Copying this so-called stereo processing ability of humans has been a research topic within computer vision/artificial intelligence for some time. A typical stereo vision setup for imitating human stereo processing relies on having two cameras facing in the same direction.

Nowadays many mobile devices have two cameras, one facing forward and the other backward. Can we use these two cameras for stereo vision? Yes, we can! With the use of the patented technology of Mira a ‘dual shot’ image taken in front of a mirror does just this. In this way two images are took of the face, one directly by the front camera the other through the mirror with the rear camera.  With the Mira technology, we can ‘reposition’ the cameras and calibrate a stereo setup which can then produce the desired 3D image, with all required mesures of the face.

MIRA uses this technology to acquire all the required optical measures from the scene, let it be a PD measurement, fitting heightFitting height:
The distance between the center of the pupils and the bottom-most point of the eyewear frame.
, vertex distanceVertex distance:
The distance between the front of the eye and the back of the lens.
, wrap angleWrap angle:
The horizontal angle between the gaze vector and the lens direction.
, pantoscopic tilt or corridor length for varifocal lens.

MIRA comes with remarkable accuracy, due to the fact that it uses stereo vision techniques based on strong mathematical foundations. Experiments show that its accuracy goes beyond half mm in standard deviation.

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