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The rapid calibration of multi-camera systems using a planar target is typically impractical due to the difficulty of viewing the target in each camera simultaneously. To address these shortcomings, a complete calibration methodology using a novel nonplanar target for rapid calibration of inward-looking visual sensor networks (VSNs) is presented. We discuss the practical limitations of the approach, arising from an analysis of implementation issues when using spheres as calibration targets such as target-to-target and target-to-camera orientation relationships. This procedure is applied to fully calibrate (intrinsic and extrinsic camera parameters) a twelve camera inward-looking VSN, using only a single image per camera. Results from the calibration are compared for nominal and measured dimensions of the target.

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Articles you may be interested inAn effective metals gettering process with a cryogenic carbon implant for CMOS image sensors AIP Conf. Proc. 1496, 265 (2012); 10.1063/1.4766539Near infrared image sensor with integrated germanium photodiodes.Erratum: "The unsaturated photocurrent controlled by two-dimensional barrier geometry of a single ZnO nanowire Schottky photodiode" [Appl.A closed-form analytical expression for diffusion-limited photocurrent in a closely spaced photodiode array is presented with reference to modern CMOS imaging arrays. The analysis makes use of the fact that the current density at the peripheral edges of the photodiode in a closely spaced array has a maximum value near the surface and decays approximately in a linear fashion with the depth into the substrate. The approximated lateral current density at the peripheral edge is then used to derive an expression for the overall peripheral photocurrent. The final expression shows good agreement with the experimental results.

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