Finally, a row of 9microcameras and 3 × 3 array of microcameras are integrated to capture and then stitch sub-images for wide FOV imaging with high resolution. Moreover, its microcamera has larger FOV which facilitates the extension of FOV with overlap between sub-images. Besides, there is strong evidence of compensation for aberrations between the cornea and intraocular optics in cases of astigmatism (horizontal/vertical) and horizontal coma. Imaging performance of the single ball lens-based system is experimentally verified to be comparable with that of conventional two-shell objective-based system. The spherical aberration of the cornea is usually positive whereas the young crystalline lens exhibits a negative spherical aberration. Optomechanical design of the imaging system is presented and the alignment tolerance is easily guaranteed by machining fitting elements on an integrative housing assembly. Its geometric aberrations are rather big but still able to be corrected by the subsequent microcameras with ordinary spherical lenses. However, that implies a reduced light throughput. That way, one can prevent that the outer regions, where spherical aberrations are most extreme, contribute to the image. Unlike conventional monocentric designs, a single ball lens is enough for the purpose of intermediate imaging. Spherical aberrations can be reduced in different ways: The simplest method is to restrict the area of the incoming light with an optical aperture. It uses a single ball lens as objective lens followed by an array of microcameras, which makes it possible to achieve high resolution in a wide field of view (FOV). A hybrid biomimetic imaging system combining the advantages of a fish eye and a compound eye is proposed.
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