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An elliptical function to model the nonlinear relation between 3D incoming rays and corresponding fisheye image coordinates is presented in this paper. Image coordinates are firstly lifted from a 2D plane to a five-dimensional quadratic space. And then the elliptical function model is built to use a linear combination of the distorted parameters of fisheye camera. Distorted parameters for fisheye...
A standard perspective image can be represented with part center area of an omnidirectional image from Micusik [12], can we generalize a few camera calibration methods from the perspective image to the omnidirectional image using part information in the center area of the omnidirectional image? In this paper, a novel omnidirectional camera calibration based on the approximate factorization method...
A simple and efficient implementation of the stretched coordinate perfectly matched layer (SC-PML) based on the Z-transform method is proposed for truncating one-dimensional nonlinear dispersive finite-difference time-domain (FDTD) lattices. The main advantage of the proposed PML formulations is that no auxiliary variable is required to update the electric flux density and the magnetic field in one-dimensional...
Turbo decoder's throughput is highly restricted by the recursion architecture of MAP decoder. In this paper, a new architecture of MAP decoder is presented. We improve the recursion architecture of the traditional radix-4 MAP decoder in order to gain higher throughput, meanwhile the modification could reduce the coding gain loss caused by the approximation of the traditional architecture. A new data...
A new 8PBF structure for 64/128 flexible point FFT processor is proposed. The processor, which is based on 8*8*2 mixed radix algorithm, can deal with multiple inputs more efficiently for MIMO applications. The 8PFB structure efficiently brings the throughput of the processor up to 1GS/s and the chances of register reverse down, reducing the power dissipation remarkably. Meanwhile the modified shift-add...
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